MORGAN STANLEY DEAN WITTER SHORT TERM US TREASURY TRUST
497, 1998-08-06
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<PAGE>
                                                Filed Pursuant to Rule 497(e)
                                                Registration File No.: 33-41187


MORGAN STANLEY DEAN WITTER 
SHORT-TERM U.S. TREASURY TRUST 
PROSPECTUS --JULY 29, 1998 
- ------------------------------------------------------------------------------ 

MORGAN STANLEY DEAN WITTER SHORT-TERM U.S. TREASURY TRUST (THE "FUND") IS AN 
OPEN-END, DIVERSIFIED MANAGEMENT INVESTMENT COMPANY WHOSE INVESTMENT 
OBJECTIVE IS CURRENT INCOME, PRESERVATION OF PRINCIPAL AND LIQUIDITY. THE 
FUND SEEKS TO ACHIEVE ITS OBJECTIVE BY INVESTING ALL OF ITS ASSETS IN U.S. 
TREASURY SECURITIES BACKED BY THE FULL FAITH AND CREDIT OF THE U.S. 
GOVERNMENT. (SEE "INVESTMENT OBJECTIVE AND POLICIES.") SHARES OF THE FUND ARE 
NOT ISSUED, INSURED OR GUARANTEED, AS TO VALUE OR YIELD, BY THE U.S. 
GOVERNMENT OR ITS AGENCIES OR INSTRUMENTALITIES. 

Shares of the Fund are sold and redeemed at net asset value without the 
imposition of a sales charge. The Fund is authorized to reimburse specific 
expenses incurred in promoting the distribution of the Fund's shares, 
including personal services to shareholders and maintenance of shareholder 
accounts, in accordance with a Plan of Distribution pursuant to Rule 12b-1 
under the Investment Company Act of 1940. Reimbursement may in no event 
exceed an amount equal to payments at the annual rate of 0.35% of the average 
daily net assets of the Fund. 

This Prospectus sets forth concisely the information you should know before 
investing in the Fund. It should be read and retained for future reference. 
Additional information about the Fund is contained in the Statement of 
Additional Information, dated July 29, 1998, which has been filed with the 
Securities and Exchange Commission, and which is available at no charge upon 
request of the Fund at the address or telephone numbers listed below. The 
Statement of Additional Information is incorporated herein by reference. 

MORGAN STANLEY DEAN WITTER 
SHORT-TERM U.S. TREASURY TRUST 
TWO WORLD TRADE CENTER 
NEW YORK, NEW YORK 10048 
(212) 392-2550 OR 
(800) 869-NEWS (toll-free) 

TABLE OF CONTENTS 

Prospectus Summary.....................................................      2 

Summary of Fund Expenses...............................................      3 

Financial Highlights ..................................................      4 

The Fund and Its Management ...........................................      5 

Investment Objective and Policies .....................................      5 

Purchase of Fund Shares ...............................................      7 

Shareholder Services...................................................      8 

Redemptions and Repurchases............................................     11 

Dividends, Distributions and Taxes.....................................     13 

Performance Information ...............................................     14 

Additional Information ................................................     15 

SHARES OF THE FUND ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR 
ENDORSED BY, ANY BANK, AND THE SHARES ARE NOT FEDERALLY INSURED BY THE 
FEDERAL DEPOSIT INSURANCE CORPORATION, THE FEDERAL RESERVE BOARD, OR ANY 
OTHER AGENCY. 

THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS
A CRIMINAL OFFENSE.

           Morgan Stanley Dean Witter Distributors Inc., Distributor


<PAGE>
PROSPECTUS SUMMARY 
- ----------------------------------------------------------------------------- 

<TABLE>
<CAPTION>
<S>                  <C>
 ------------------- ------------------------------------------------------------------ 
THE                  The Fund is organized as a Trust, commonly known as a Massachusetts 
FUND                 business trust, and is an open-end, diversified management investment 
                     company investing in U.S. Treasury securities backed by the full faith 
                     and credit of the U.S. Government. 
- -------------------  ------------------------------------------------------------------ 
SHARES OFFERED       Shares of beneficial interest with $0.01 par value (see page 15). 
- -------------------  ------------------------------------------------------------------ 
OFFERING             The price of the shares offered by this Prospectus is determined once 
PRICE                daily as of 4:00 p.m., New York time, on each day that the New York 
                     Stock Exchange is open, and is equal to the net asset value per share 
                     without a sales charge (see page 7). 
- -------------------  ------------------------------------------------------------------ 
MINIMUM              Minimum initial purchase through Distributor, $10,000 ($1,000 if the 
PURCHASE             account is opened through EasyInvest (Service Mark) ) although the Fund 
                     and Distributor may, from time to time, accept initial purchases of 
                     $5,000; minimum subsequent investment, $100 (see page 7). 
- -------------------  ------------------------------------------------------------------ 
INVESTMENT           The investment objective of the Fund is to provide investors with current 
OBJECTIVE            income, preservation of principal and liquidity. 
- -------------------  ------------------------------------------------------------------ 
INVESTMENT           In order to maximize the amount of the Fund's dividends which are exempt 
POLICIES             from state and local income taxation, the Fund will invest all of its 
                     assets in U.S. Treasury securities which are direct obligations of the 
                     U.S. Government (see page 5). 
- -------------------  ------------------------------------------------------------------ 
INVESTMENT           Morgan Stanley Dean Witter Advisors Inc., the Investment Manager of 
MANAGER              the Fund, and its wholly-owned subsidiary, Morgan Stanley Dean Witter 
                     Services Company Inc. serve in various investment management, advisory, 
                     management and administrative capacities to 101 investment companies 
                     and other portfolios with assets of approximately $115.2 billion at 
                     June 30, 1998 (see page 4). 
- -------------------  ------------------------------------------------------------------ 
MANAGEMENT           The Investment Manager receives a monthly fee at the annual rate of 
FEE                  0.35% of daily net assets (see page 4). 
- -------------------  ------------------------------------------------------------------ 
DIVIDENDS AND        Dividends are declared daily and paid monthly. Capital gains 
CAPITAL GAINS        distributions, if any, are paid at least once a year or are retained 
DISTRIBUTIONS        for reinvestment by the Fund. Dividends and capital gains distributions 
                     are automatically invested in additional shares at net asset value unless 
                     the shareholder elects to receive cash (see page 13). 
- -------------------  ------------------------------------------------------------------ 
DISTRIBUTOR          Morgan Stanley Dean Witter Distributors Inc. (the "Distributor") (see 
AND PLAN OF          page 7). The Fund is authorized to reimburse specific expenses incurred 
DISTRIBUTION         in promoting the distribution of the Fund's shares, including personal 
                     services to shareholders and maintenance of shareholders accounts, in 
                     accordance with a Plan of Distribution with the Distributor pursuant 
                     to Rule 12b-1 under the Investment Company Act of 1940. Reimbursement 
                     may in no event exceed an amount equal to payments at an annual rate 
                     of 0.35% of average daily net assets of the Fund (see page 8). 
- -------------------  ------------------------------------------------------------------ 
REDEMPTION           At net asset value; account may be involuntarily redeemed if total value 
                     of the account is less than $1,000 or, if the account was opened through 
                     EasyInvest (Service Mark), if after twelve months the shareholder has 
                     invested less than $10,000 in the account (see pages 11-13). 
- -------------------  ------------------------------------------------------------------ 
RISKS                The Fund invests only in U.S. Treasury securities which are subject 
                     to minimal risk of loss of income and principal. It may engage in the 
                     purchase of such securities on a when-issued basis. The value of the 
                     Fund's portfolio securities, and therefore the Fund's net asset value 
                     per share, may increase or decrease due to various factors, principally 
                     changes in prevailing interest rates. Generally, a rise in interest 
                     rates will result in a decrease in the Fund's net asset value per share, 
                     while a drop in interest rates will result in an increase in the Fund's 
                     net asset value per share. A portion of the U.S. Treasury securities 
                     in which the Fund invests may be zero coupon Treasury securities. Such 
                     securities are subject to greater market price fluctuations during periods 
                     of changing prevailing interest rates (see pages 5-6). 
</TABLE>

   The above is qualified in its entirety by the detailed information 
                    appearing elsewhere in this Prospectus 
               and in the Statement of Additional Information. 

                                2           
<PAGE>
SUMMARY OF FUND EXPENSES 
- ----------------------------------------------------------------------------- 

The following table illustrates all expenses and fees that a shareholder of 
the Fund will incur. The expenses and fees set forth in the table are for the 
fiscal year ended May 31, 1998. 

<TABLE>
<CAPTION>
<S>                                                                         <C>
SHAREHOLDER TRANSACTION EXPENSES 
Maximum Sales Charge Imposed on Purchases.................................    None 
Maximum Sales Charge Imposed on Reinvested Dividends .....................    None 
Deferred Sales Charge ....................................................    None 
Redemption Fees ..........................................................    None 
Exchange Fee .............................................................    None 
ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS) 
Management Fees...........................................................    0.35% 
12b-1 Fees* ..............................................................    0.34% 
Other Expenses ...........................................................    0.13% 
Total Fund Operating Expenses ............................................    0.82% 
</TABLE>

- ------------ 
 *     A portion of the 12b-1 fee, which may not exceed 0.25% of the Fund's 
       average daily net assets, is characterized as a service fee within the 
       meaning of National Association of Securities Dealers Inc. ("NASD") 
       guidelines. 

<TABLE>
<CAPTION>
 EXAMPLE                                                                  1 YEAR    3 YEARS   5 YEARS    10 YEARS 
                                                                         -------- ---------  --------- ---------- 
<S>                                                                       <C>        <C>         <C>
You would pay the following expenses on a $1,000 investment, assuming 
(1) 5% annual return and (2) redemption at the end of each time period:     $8        $26       $46        $101 
</TABLE>

THE ABOVE EXAMPLE SHOULD NOT BE CONSIDERED A REPRESENTATION OF PAST OR FUTURE 
EXPENSES OR PERFORMANCE. ACTUAL EXPENSES OF THE FUND MAY BE MORE OR LESS THAN 
THOSE SHOWN. 

The purpose of this table is to assist the investor in understanding the 
various costs and expenses that an investor in the Fund will bear directly or 
indirectly. For a more complete description of these costs and expenses, see 
"The Fund and its Management" and "Purchase of Fund Shares--Plan of 
Distribution" in this Prospectus. 

Long-term shareholders of the Fund may pay more in distribution fees than the 
economic equivalent of the maximum front-end sales charges permitted by the 
NASD. 

                                3           
<PAGE>
FINANCIAL HIGHLIGHTS 
- ----------------------------------------------------------------------------- 

The following ratios and per share data for a share of beneficial interest 
outstanding throughout each period have been audited by 
PricewaterhouseCoopers LLP, independent accountants. The financial highlights 
should be read in conjunction with the financial statements, notes thereto 
and the unqualified report of independent accountants which are contained in 
the Statement of Additional Information. Further unaudited information about 
the performance of the Fund is contained in the Fund's Annual Report to 
Shareholders, which may be obtained without charge upon request to the Fund. 

<TABLE>
<CAPTION>
                                                                                                           
                                                                                                           
                                                                                                          
                                                                                                     FOR THE PERIOD        
                                                FOR THE YEAR ENDED MAY 31,                           AUGUST 13, 1991* 
                                -------------------------------------------------------------------  THROUGH       
                                 1998         1997       1996        1995       1994        1993     MAY 31, 1992   
                                ---------- ----------  ---------- ----------- ---------- ----------  ---------------
     <S>                       <C>        <C>         <C>        <C>         <C>        <C>         <C>
PER SHARE OPERATING 
  PERFORMANCE: 
    Net asset value, 
      beginning of period          $ 9.85     $ 9.84      $ 9.98     $ 9.88      $10.34     $10.21      $10.00 
                                ---------- ----------  ---------- ----------  ---------- ----------  ---------------- 
    Net investment income            0.53       0.54        0.54       0.49        0.49       0.54        0.44 
    Net realized and 
      unrealized gain (loss)         0.11       --         (0.14)      0.10       (0.45)      0.13        0.20 
                                ---------- ----------  ---------- ----------  ---------- ----------  ---------------- 
   Total from investment 
      operations                     0.64       0.54        0.40       0.59        0.04       0.67        0.64 
                                ---------- ----------  ---------- ----------  ---------- ----------  ---------------- 
   Less dividends and 
      distributions from: 
      Net investment income         (0.53)     (0.53)      (0.54)     (0.49)      (0.50)     (0.53)      (0.43) 
      Net realized gain                --         --          --         --          --        (0.01)       -- 
                                ---------- ----------  ---------- ----------  ---------- ----------  ---------------- 
      Total dividends and 
         distributions              (0.53)     (0.53)      (0.54)     (0.49)      (0.50)     (0.54)      (0.43) 
                                ---------- ----------  ---------- ----------  ---------- ----------  ---------------- 
      Net asset value, end  
         of period                 $ 9.96     $ 9.85      $ 9.84     $ 9.98      $ 9.88     $10.34      $10.21 
                                ========== ==========  ========== ==========  ========== ==========  ================ 
TOTAL INVESTMENT RETURN+             6.68%      5.63%       4.09%      6.22%       0.25%      6.75%       6.55%(1) 
RATIOS TO AVERAGE NET ASSETS: 
   Expenses                          0.82%      0.83%       0.84%      0.84%       0.79%      0.80%       0.79%(2)(3) 
   Net investment income             5.30%      5.42%       5.33%      4.93%       4.74%      5.18%       5.49%(2)(3) 
SUPPLEMENTAL DATA: 
   Net assets, end of period,
     in thousands                $241,025    $230,267   $258,637    $273,184   $516,017    $584,206     $523,555 
   Portfolio turnover rate             95%       149%         63%        30%         49%        21%         12%(1) 
</TABLE>

- ------------ 
 *     Commencement of operations. 
 +     Calculated based on the net asset value as of the last business day of 
       the period. 
(1)    Not annualized. 
(2)    Annualized. 
(3)    If the Fund had borne all expenses that were assumed or waived by the 
       Investment Manager, the above annualized expense and net investment 
       income ratios would have been 0.81% and 5.47%, respectively. 

THE FUND AND ITS MANAGEMENT 
- ----------------------------------------------------------------------------- 

Morgan Stanley Dean Witter Short-Term U.S. Treasury Trust (the "Fund") 
(formerly named Dean Witter Short-Term U.S. Treasury Trust) is an open-end 
diversified management investment company. The Fund is a trust of the type 
commonly known as a "Massachusetts business trust" and was organized under 
the laws of The Commonwealth of Massachusetts on June 4, 1991. 

   Morgan Stanley Dean Witter Advisors Inc. ("MSDW Advisors" or the 
"Investment Manager"), whose address is Two World Trade Center, New York, New 
York 10048, is the Fund's Investment Manager. The Investment Manager is a 
wholly-owned subsidiary of Morgan Stanley Dean Witter & Co., a preeminent 
global financial services firm that maintains leading market positions in 
each of its three primary businesses--securities, asset management and credit 
services. The Investment Manager, which was incorporated in July, 1992 under 
the name Dean Witter InterCapital Inc., changed its name to Morgan Stanley 
Dean Witter Advisors Inc. on June 22, 1998. 

   MSDW Advisors and its wholly-owned subsidiary, Morgan Stanley Dean Witter 
Services Company Inc. ("MSDW Services"), serve in various investment man- 

                                4           
<PAGE>
agement, advisory, management and administrative capacities to a total of 101 
investment companies, 28 of which are listed on the New York Stock Exchange, 
with combined total assets of approximately $110.8 billion as of June 30, 
1998. The Investment Manager also manages portfolios of pension plans, other 
institutions and individuals which aggregated approximately $4.4 billion at 
such date. 

   The Fund has retained the Investment Manager to provide administrative 
services, manage its business affairs and manage the investment of the Fund's 
assets, including the placing of orders for the purchase and sale of 
portfolio securities. MSDW Advisors has retained MSDW Services to perform the 
aforementioned administrative services for the Fund. The Fund's Board of 
Trustees reviews the various services provided by or under the direction of 
the Investment Manager to ensure that the Fund's general investment policies 
and programs are being properly carried out and that administrative services 
are being provided to the Fund in a satisfactory manner. 

   As full compensation for the services and facilities furnished to the Fund 
and for expenses of the Fund assumed by the Investment Manager, the Fund pays 
the Investment Manager monthly compensation calculated daily by applying an 
annual rate of 0.35% to the Fund's net assets determined as of the close of 
each business day. For the fiscal year ended May 31, 1998, the Fund accrued 
total compensation to the Investment Manager amounting to 0.35% of the Fund's 
average daily net assets and the Fund's total expenses amounted to 0.82% of 
the Fund's average daily net assets. 

INVESTMENT OBJECTIVE AND POLICIES 
- ----------------------------------------------------------------------------- 

The investment objective of the Fund is current income, preservation of 
principal and liquidity. The Fund seeks to achieve its investment objective 
by investing all of its net assets in U.S. Treasury securities. U.S. Treasury 
securities, which presently consist of U.S. Treasury bills, U.S. Treasury 
notes and U.S. Treasury bonds, are direct obligations of the U.S. Treasury 
and are backed by the "full faith and credit" of the U.S. Government. The 
investment objective is a fundamental policy of the Fund and may not be 
changed without the approval of the holders of a majority of the Fund's 
shares. There is no assurance that the Fund's investment objective will be 
achieved. 

   Neither the value nor the yield of the U.S. Treasury securities in which 
the Fund invests (or the value or yield of shares of the Fund) are guaranteed 
by the U.S. Government. The value of the Fund's portfolio securities and 
therefore the net asset value of the Fund's shares may increase or decrease 
due to changes in prevailing interest rates and other factors. Generally, as 
prevailing interest rates rise, the value of the securities held by the Fund, 
and concomitantly, the net asset value of the Fund's shares, will fall. Debt 
securities with shorter maturities are generally subject to a lesser degree 
of market fluctuation as a result of changes in interest rates than debt 
securities with longer maturities. 

   In an effort to minimize fluctuations in market value of its portfolio 
securities the Fund is expected to maintain a portfolio with a 
dollar-weighted average maturity of less than 3 years. 

ZERO COUPON TREASURY SECURITIES. A portion of the U.S. Treasury securities 
purchased by the Fund may be "zero coupon" Treasury securities. These are 
U.S. Treasury notes and bonds which have been stripped of their unmatured 
interest coupons and receipts or which are certificates representing 
interests in such stripped debt obligations and coupons. Such securities are 
purchased at a discount from their face amount, giving the purchaser the 
right to receive their full value at maturity. A zero coupon security pays no 
interest to its holder during its life. Its value to an investor consists of 
the difference between its face value at the time of maturity and the price 
for which it was acquired, which is generally an amount significantly less 
than its face value (sometimes referred to as a "deep discount" price). 

   The interest earned on such securities is, implicitly, automatically 
compounded and paid out at maturity. While such compounding at a constant 
rate eliminates the risk of receiving lower yields upon reinvestment of 
interest if prevailing interest rates decline, the owner of a zero coupon 
security will be unable to participate in higher yields upon reinvestment of 
interest received if prevailing interest rates rise. For this reason, zero 
coupon securities are subject to substantially greater market price 
fluctuations during periods of changing prevailing interest rates than are 
comparable debt securities which make current distributions of interest. 
Current federal tax law requires that a holder (such as the Fund) of a zero 
coupon security accrue a portion of the discount at which the security was 
purchased as income each year even though the Fund receives no interest 
payments in cash on the security during the year. See "Dividends, 
Distributions and Taxes." 

   Certain banks and brokerage firms have separated ("stripped") the 
principal portions ("corpus") from the 

                                5           
<PAGE>
coupon portions of the U.S. Treasury bonds and notes and sell them separately 
in the form of receipts or certificates representing undivided interests in 
these instruments (which instruments are generally held by a bank in a 
custodial or trust account). The Fund will not purchase any such receipts or 
certificates representing stripped corpus or coupon interests in U.S. 
Treasury securities sold by banks and brokerage firms. The Fund will only 
purchase zero coupon Treasury securities which have been stripped by the 
Federal Reserve Bank. 

WHEN-ISSUED AND DELAYED DELIVERY SECURITIES AND FIRM COMMITMENTS. From time 
to time, in the ordinary course of business, the Fund may purchase U.S. 
Treasury securities on a when-issued or delayed delivery basis or may 
purchase or sell U.S. Treasury securities on a firm commitment basis. For 
example, the Fund may wish to purchase U.S. Treasury notes and bonds sold at 
periodic U.S. Treasury auctions prior to a month or more of their issuance 
("when-issued"). When such transactions are negotiated, the price is fixed at 
the time of the commitment, but delivery and payment can take place a month 
or more after the date of the commitment. While the Fund will only purchase 
securities on a when-issued, delayed delivery or firm commitment basis with 
the intention of acquiring the securities, the Fund may sell the securities 
before the settlement date, if it is deemed advisable. The securities so 
purchased or sold are subject to market fluctuation and no interest accrues 
to the purchaser during this period. At the time the Fund makes the 
commitment to purchase or sell securities on a when-issued, delayed delivery 
or firm commitment basis, it will record the transaction and thereafter 
reflect the value, each day, of such security purchased or, if a sale, the 
proceeds to be received, in determining its net asset value. At the time of 
delivery of the securities, their value may be more or less than the purchase 
or sale price. The Fund will also establish a segregated account with its 
custodian bank in which it will continually maintain cash or cash equivalents 
or other portfolio (U.S. Treasury) securities equal in value to commitments 
to purchase securities on a when-issued, delayed delivery or firm commitment 
basis. 

YEAR 2000. The investment management services provided to the Fund by the 
Investment Manager and the services provided to shareholders by the 
Distributor and the Transfer Agent depend on the smooth functioning of their 
computer systems. Many computer software systems in use today cannot 
recognize the year 2000, but revert to 1900 or some other date, due to the 
manner in which dates were encoded and calculated. That failure could have a 
negative impact on the handling of securities trades, pricing and account 
services. The Investment Manager, the Distributor and the Transfer Agent have 
been actively working on necessary changes to their own computer systems to 
prepare for the year 2000 and expect that their systems will be adapted 
before that date, but there can be no assurance that they will be successful, 
or that interaction with other non-complying computer systems will not impair 
their services at that time. 

   In addition, it is possible that the markets for securities in which the 
Fund invests may be detrimentally affected by computer failures throughout 
the financial services industry beginning January 1, 2000. Improperly 
functioning trading systems may result in settlement problems and liquidity 
issues. In addition, corporate and governmental data processing errors may 
result in production problems for individual companies and overall economic 
uncertainties. Earnings of individual issuers will be affected by remediation 
costs, which may be substantial and may be reported inconsistently in U.S. 
financial statements. Accordingly, the Fund's investments may be adversely 
affected. 

PORTFOLIO MANAGEMENT 

The Fund's portfolio is actively managed by its Investment Manager with a 
view to achieving the Fund's investment objective. In determining which 
securities to purchase for the Fund or hold in the Fund's portfolio, the 
Investment Manager will rely on information from various sources, including 
research, analysis and appraisals of brokers and dealers, including Dean 
Witter Reynolds Inc., Morgan Stanley & Co. Incorporated and other 
broker-dealers that are affiliates of the Investment Manager and others 
regarding economic developments and interest rate trends, and the Investment 
Manager's own analysis of factors it deems relevant. The Fund's portfolio is 
managed within MSDW Advisors' Taxable Fixed Income Group, which manages 23 
funds and fund portfolios, with approximately $13.8 billion in assets as of 
June 30, 1998. Rajesh K. Gupta, Senior Vice President of MSDW Advisors and 
Manager of MSDW Advisors' Government Fixed-Income Group, has been the primary 
portfolio manager of the Fund since its inception and has been a portfolio 
manager at MSDW Advisors for over five years. 

   Brokerage commissions are not normally charged on the purchase or sale of 
U.S. Government obligations, but such transactions may involve costs in the 
form of spreads between bid and asked prices. Pursuant to an order of the 
Securities and Exchange Commission, the Fund may effect principal 
transactions in certain money market instruments with Dean Witter Reynolds 
Inc. In addition, the Fund may incur brokerage commissions on transactions 
conducted through Dean Witter Reynolds Inc., Morgan Stanley & Co. 
Incorporated and other 

                                6           
<PAGE>
brokers and dealers that are affiliates of the Investment Manager. Although 
the Fund does not intend to engage in short-term trading of portfolio 
securities as a means of achieving its investment objective, it may sell 
portfolio securities without regard to the length of time they have been held 
whenever such sale will, in the opinion of the Investment Manager, strengthen 
the Fund's position and contribute to its investment objective. It is not 
anticipated that the portfolio trading engaged in by the Fund will result in 
its portfolio turnover rate exceeding 200% in any one year. The Fund will 
incur costs commensurate with its portfolio turnover rate. Short term gains 
and losses may result from such transactions. See "Dividends, Distributions 
and Taxes" for a full discussion of the tax implications of the Fund's 
trading policy. 

PURCHASE OF FUND SHARES 
- ----------------------------------------------------------------------------- 

The Fund offers its shares for sale to the public on a continuous basis. 
Pursuant to a Distribution Agreement between the Fund and Morgan Stanley Dean 
Witter Distributors Inc. ("MSDW Distributors" or the "Distributor"), an 
affiliate of the Investment Manager, shares of the Fund are distributed by 
the Distributor and offered by Dean Witter Reynolds Inc. ("DWR"), a selected 
dealer and subsidiary of Morgan Stanley Dean Witter & Co., and others who 
have entered into Selected Dealer agreements with the Distributor ("Selected 
Broker-Dealers"). It is anticipated that DWR will undergo a change of 
corporate name which is expected to incorporate the brand name of "Morgan 
Stanley Dean Witter," pending approval of various regulatory authorities. The 
principal executive office of the Distributor is located at Two World Trade 
Center, New York, New York 10048. 

   The minimum initial purchase is $10,000 (the Fund and the Distributor may, 
from time to time accept initial purchases of $5,000). The minimum initial 
purchase in the case of investments through EasyInvest (Service Mark), an 
automatic purchase plan (see "Shareholder Services"), is $1,000, provided 
that the schedule of automatic investments will result in investments 
totalling at least $10,000 within the first twelve months. In the case of 
investments pursuant to systematic payroll deduction plans (including 
Individual Retirement Plans), the Fund, in its discretion, may accept 
investments without regard to any minimum amounts which would otherwise be 
required if the Fund has reason to believe that additional investments will 
increase the investment in all accounts under such plans to at least $10,000. 
Minimum subsequent purchases of $100 or more may be made by sending a check, 
payable to Morgan Stanley Dean Witter Short-Term U.S. Treasury Trust, 
directly to Morgan Stanley Dean Witter Trust FSB (the "Transfer Agent" or 
"MSDW Trust") at P.O. Box 1040, Jersey City, NJ 07303 or by contacting a 
Morgan Stanley Dean Witter Financial Advisor or other Selected Broker-Dealer 
representative of DWR or another Selected Broker-Dealer. The offering price 
will be the net asset value per share next determined (see "Determination of 
Net Asset Value" below) following receipt and acceptance by the Transfer 
Agent of an order in proper form and accompanied by payment in Federal funds 
(i.e., monies of member banks within the Federal Reserve System held on 
deposit at a Federal Reserve Bank) available to the Fund for investment. 
Orders for the purchase of Fund shares placed by investors through DWR or 
another Selected Broker-Dealer will be transmitted to the Transfer Agent for 
purchase on that date, with payment in Federal funds transmitted to the 
Transfer Agent on the business day following the day the order is placed. 
Shares commence earning income on the date following the date of purchase. 
Certificates for shares purchased will not be issued unless requested by the 
shareholder in writing to the Transfer Agent. 

   Sales personnel of a Selected Broker-Dealer are compensated for shares of 
the Fund sold by them by the Distributor or any of its affiliates and/or by a 
Selected Broker-Dealer. In addition, some sales personnel of the Selected 
Broker-Dealer will receive various types of non-cash compensation as special 
sales incentives, including trips to educational and/or business seminars and 
merchandise. The Fund and the Distributor reserve the right to reject any 
purchase orders. 

DETERMINATION OF NET ASSET VALUE 

The net asset value per share of the Fund is determined by taking the value 
of all the assets of the Fund, subtracting all liabilities, dividing by the 
number of shares outstanding and adjusting the result to the nearest cent. 
The net asset value per share is determined by the Investment Manager as of 
4:00 p.m. New York time on each day that the New York Stock Exchange is open 
(or, on days when the New York Stock Exchange closes prior to 4:00 p.m., at 
such earlier time). The net asset value per share will not be determined on 
Good Friday and on such other federal and non-federal holidays as are 
observed by the New York Stock Exchange. 

   In the calculation of the Fund's net asset value: (1) all portfolio 
securities for which over-the-counter market quotations are readily available 
are valued at the bid price; (2) when market quotations are not readily 
avail- 

                                7           
<PAGE>
able, including circumstances under which it is determined by the Investment 
Manager that sale or bid prices are not reflective of a security's market 
value, portfolio securities are valued at their fair value as determined in 
good faith under procedures established by and under the general supervision 
of the Fund's Board of Trustees (valuation of securities for which market 
quotations are not readily available may be based upon current market prices 
of securities which are comparable in coupon, rating and maturity or an 
appropriate matrix utilizing similar factors); and (3) short-term debt 
instruments having a maturity date of more than 60 days are valued on a 
"mark-to-market" basis, that is, at prices based on market quotations for 
securities of similar type, yield, quality and maturity, until 60 days prior 
to maturity and thereafter at amortized cost. Short-term instruments having a 
maturity date of 60 days or less at the time of purchase are val-ued at 
amortized cost unless the Board of Trustees determines this does not 
represent the securities' market value, in which case these securities will 
be valued at their fair value as determined by the Trustees. 

   Certain of the Fund's portfolio securities may be valued by an outside 
pricing service approved by the Fund's Trustees. The pricing service may 
utilize a matrix system incorporating security quality, maturity and coupon 
as the evaluation model parameters, and/or research and evaluations by its 
staff, including review of broker-dealer market price quotations, in 
determining what it believes is the fair valuation of the portfolio 
securities valued by such pricing service. 

PLAN OF DISTRIBUTION 

The Fund has entered into a Plan of Distribution pursuant to Rule 12b-1 under 
the Investment Company Act of 1940, as amended (the "Act"), with the 
Distributor whereby the expenses of certain activities and services, 
including personal services to shareholders and maintenance of shareholder 
accounts, in connection with the distribution of the Fund's shares are 
reimbursed. The principal activities and services which may be provided by 
the Distributor and its affiliates, or any other Selected Broker-Dealer under 
the Plan include: (1) compensation to, and expenses of, Morgan Stanley Dean 
Witter Financial Advisors and other Selected Broker-Dealer representatives, 
including overhead and telephone expenses; (2) sales incentives and bonuses 
to sales representatives and to marketing personnel in connection with 
promoting sales of the Fund's shares; (3) expenses incurred in connection 
with promoting sales of the Fund's shares; (4) preparing and distributing 
sales literature; and (5) providing advertising and promotional activities, 
including direct mail solicitation and television, radio, newspaper, magazine 
and other media advertisements. Reimbursements for these services will be 
made in monthly payments by the Fund, which will in no event exceed an amount 
equal to a payment at the annual rate of 0.35% of the Fund's average daily 
net assets. A portion of the amount payable pursuant to the Plan, which may 
not exceed 0.25% of the Fund's average daily net assets, is characterized as 
a service fee within the meaning of the NASD guidelines. The services fee is 
a payment made for personal services and/or the maintenance of shareholder 
accounts. Expenses incurred pursuant to the Plan in any fiscal year will not 
be reimbursed by the Fund through payments accrued in any subsequent fiscal 
year. The Fund accrued $827,872 to the Distributor pursuant to the Plan for 
the fiscal year ended May 31, 1998. This is an accrual at the annual rate of 
0.34% of the Fund's average daily net assets. 

SHAREHOLDER SERVICES 
- ----------------------------------------------------------------------------- 

AUTOMATIC INVESTMENT OF DIVIDENDS AND DISTRIBUTIONS. All income dividends 
and capital gains distributions are automatically paid in full and fractional 
shares of the Fund, unless the shareholder requests that they be paid in 
cash. Such dividends and distributions will be paid in shares of the Fund at 
net asset value per share. At any time an investor may request the Transfer 
Agent in writing to have subsequent dividends and/or capital gains 
distributions paid to the investor in cash rather than shares. To assure 
sufficient time to process the change, such request should be received by the 
Transfer Agent at least five business days prior to the payment date for 
which it commences to take effect. In the case of recently purchased shares 
for which registration instructions have not been received on the record 
date, cash payments will be made to DWR or other Selected Broker-Dealer 
through whom shares were purchased. 

INVESTMENT OF DISTRIBUTIONS RECEIVED IN CASH.  Any shareholder who receives a 
cash payment representing a dividend or capital gains distribution may invest 
such dividend or distribution at the net asset value next determined after 
receipt by the Transfer Agent by returning the check or the proceeds to the 
Transfer Agent within 30 days after the payment date. 

TARGETED DIVIDENDS (SERVICE MARK) . In states where it is legally 
permissible, shareholders may also have all income dividends and capital 
gains distributions automatically in- 

                                8           
<PAGE>
vested in shares of an open-end investment company for which MSDW Advisors 
serves as investment manager (collectively, the "Morgan Stanley Dean Witter 
Funds"), other than Morgan Stanley Dean Witter Short-Term U.S. Treasury 
Trust. Such investment will be made as described above for automatic 
investment in shares of the Fund, at the net asset value per share of the 
selected Morgan Stanley Dean Witter Fund as of the close of business on the 
payment date and will begin to earn dividends, if any, in the selected Morgan 
Stanley Dean Witter Fund the next business day. To participate in the 
Targeted Dividends program, shareholders should contact their Morgan Stanley 
Dean Witter Financial Advisor or other Selected Broker-Dealer representative 
or the Transfer Agent. Shareholders of the Fund must be shareholders of the 
selected Class of the Morgan Stanley Dean Witter Fund targeted to receive 
investments from dividends at the time they enter the Targeted Dividends 
program. Investors should review the prospectus of the targeted Morgan 
Stanley Dean Witter Fund before entering the program. 

EASYINVEST (SERVICE MARK) . Shareholders may subscribe to EasyInvest, an 
automatic purchase plan which provides for any amount from $100 to $5,000 to 
be transferred automatically from a checking or savings account or following 
redemption of shares of a Morgan Stanley Dean Witter money market fund, on a 
semi-monthly, monthly or quarterly basis, to the Fund's Transfer Agent for 
investment in shares of the Fund (see "Purchase of Fund Shares" and 
"Redemptions and Repurchases--Involuntary Redemption"). Shares purchased 
through EasyInvest will be added to the shareholder's existing account at the 
net asset value calculated the same business day the transfer of funds is 
effected. For further information or to subscribe to EasyInvest, shareholders 
should contact their Morgan Stanley Dean Witter Financial Advisor or other 
Selected Broker-Dealer representative or the Transfer Agent. 

SYSTEMATIC WITHDRAWAL PLAN. A systematic withdrawal plan (the "Withdrawal 
Plan") is available for shareholders who own or purchase shares of the Fund 
having a minimum value of $10,000 based upon the then current offering price. 
The Withdrawal Plan provides for monthly or quarterly (March, June, September 
and December) checks in any dollar amount, not less than $25, or in any whole 
percentage of the account balance, on an annualized basis. The shares will be 
redeemed at their net asset value determined, at the shareholder's option, on 
the tenth or twenty-fifth day (or next following business day) of the 
relevant month or quarter and normally a check for the proceeds will be 
mailed by the Transfer Agent, or amounts credited to a shareholder's DWR or 
other Selected Broker-Dealer brokerage account, within five business days 
after the date of redemption. Only shareholders having accounts in which no 
share certificates have been issued will be permitted to enroll in the 
Withdrawal Plan. 

   Withdrawal Plan payments should not be considered as dividends, yields or 
income. If periodic withdrawal plan payments continuously exceed net 
investment income and net capital gains, the shareholder's original 
investment will be correspondingly reduced and ultimately exhausted. 

   Each withdrawal constitutes a redemption of shares and any gain or loss 
realized must be recognized for federal income, and generally, state and 
local tax purposes. 

   Shareholders wishing to enroll in the Withdrawal Plan should make this 
election on the Investment Application or contact their Morgan Stanley Dean 
Witter Financial Advisor or other Selected Broker-Dealer representative or 
the Transfer Agent. 

TAX SHELTERED RETIREMENT PLANS. Retirement plans are available through the 
Investment Manager for use by the self-employed, eligible Individual 
Retirement Accounts and Custodial Accounts under Section 403(b)(7) of the 
Internal Revenue Code. Adoption of such plans should be on advice of legal 
counsel or tax adviser. 

   For further information regarding plan administration, custodial fees and 
other details, investors should contact their Morgan Stanley Dean Witter 
Financial Advisor or other Selected Broker-Dealer representative or the 
Transfer Agent. 

EXCHANGE PRIVILEGE 

An "Exchange Privilege," that is, the privilege of exchanging shares of 
certain Morgan Stanley Dean Witter Funds for shares of the Fund, exists 
whereby shares of Morgan Stanley Dean Witter Funds that are multiple class 
funds ("Morgan Stanley Dean Witter Multi-Class Funds"), shares of Morgan 
Stanley Dean Witter Multi-State Municipal Series Trust and Morgan Stanley 
Dean Witter Hawaii Municipal Trust, which are Morgan Stanley Dean Witter 
Funds sold with a front-end sales charge ("FSC Funds"), and shares of Morgan 
Stanley Dean Witter Global Short-Term Income Fund Inc. ("Global Short-Term"), 
which is a Morgan Stanley Dean Witter Fund offered with a contingent deferred 
sales charge ("CDSC"), may be exchanged for shares of the Fund, Morgan 
Stanley Dean Witter Limited Term Municipal Trust and Morgan Stanley Dean 
Witter Short-Term Bond Fund, and for shares of five Morgan Stanley Dean 
Witter Funds which are money market funds: Morgan Stanley Dean Witter Liquid 
Asset Fund Inc., Morgan Stanley Dean 

                                9           
<PAGE>
Witter U.S. Government Money Market Trust, Morgan Stanley Dean Witter 
Tax-Free Daily Income Trust, Morgan Stanley Dean Witter California Tax Free 
Daily Income Trust and Morgan Stanley Dean Witter New York Municipal Money 
Market Trust (which eight funds, including the Fund, are hereinafter 
collectively referred to as "Exchange Funds"). Shares of the Exchange Funds 
received in an exchange for shares of a Morgan Stanley Dean Witter 
Multi-Class Fund may be redeemed and exchanged only for shares of the 
corresponding Class of a Morgan Stanley Dean Witter Multi-Class Fund or for 
shares of one of the other Exchange Funds, provided that shares of the 
Exchange Funds received in an exchange for Class A shares of a Morgan Stanley 
Dean Witter Multi-Class Fund may also be redeemed and exchanged for shares of 
a FSC Fund, and shares of the Exchange Funds received in an exchange for 
Class B shares of a Morgan Stanley Dean Witter Multi-Class Fund may also be 
redeemed and exchanged for shares of Global Short-Term. In addition, shares 
of the Exchange Funds received in an exchange for shares of a FSC Fund may be 
redeemed and exchanged for Class A shares of a Morgan Stanley Dean Witter 
Multi-Class Fund or for shares of one of the other Exchange Funds, and shares 
of the Exchange Funds received in an exchange for shares of Global Short-Term 
may be redeemed and exchanged for Class B shares of a Morgan Stanley Dean 
Witter Multi-Class Fund or for shares of one of the other Exchange Funds. 

   An exchange to an Exchange Fund that is not a money market fund is on the 
basis of the next calculated net asset value per share of each fund after the 
exchange order is received. When exchanging into a money market fund, shares 
of the Multi-Class Fund, the FSC Fund, Global Short-Term or the Exchange Fund 
are redeemed at their next calculated net asset value and exchanged for 
shares of the money market fund at their net asset value determined the 
following business day. Ultimately, any applicable CDSC will have to be paid 
upon redemption of shares originally purchased from Global Short-Term or a 
Class of a Morgan Stanley Dean Witter Multi-Class Fund that imposes a CDSC. 
(If shares of an Exchange Fund received in exchange for shares originally 
purchased from Global Short-Term or Class B of a Morgan Stanley Dean Witter 
Multi-Class Fund are exchanged for shares of Global Short-Term or another 
Morgan Stanley Dean Witter Multi-Class Fund having a different CDSC schedule 
than that of Global Short-Term or the Morgan Stanley Dean Witter Multi-Class 
Fund from which the Exchange Fund shares were acquired, the shares will be 
subject to the higher CDSC schedule.) During the period of time the shares 
originally purchased from Global Short-Term or from a Class of a Morgan 
Stanley Dean Witter Multi-Class Fund that imposes a CDSC remain in the 
Exchange Fund, the holding period (for the purpose of determining the rate of 
CDSC) is frozen. If those shares are subsequently re-exchanged for shares of 
a Morgan Stanley Dean Witter Multi-Class Fund or shares of Global Short-Term, 
the holding period previously frozen when the first exchange was made resumes 
on the last day of the month in which shares of a Morgan Stanley Dean Witter 
Multi-Class Fund or shares of Global Short-Term are reacquired. Thus, the 
CDSC is based upon the time (calculated as described above) the shareholder 
was invested in shares of a Morgan Stanley Dean Witter Multi-Class Fund or in 
shares of Global Short-Term. In the case of exchanges of Class A shares of a 
Morgan Stanley Dean Witter Multi-Class Fund which are subject to a CDSC, the 
holding period also includes the time (calculated as described above) the 
shareholder was invested in shares of a FSC Fund. In the case of shares 
exchanged into an Exchange Fund on or after April 23, 1990, upon a redemption 
of shares which results in a CDSC being imposed, a credit (not to exceed the 
amount of the CDSC) will be given in an amount equal to the Exchange Fund 
12b-1 fees, if any, incurred on or after that date which are attributable to 
those shares (see "Purchase of Fund Shares--Plan of Distribution" in the 
respective Exchange Fund Prospectus for a description of Exchange Fund 
distribution fees). Exchanges may be made after the shares of the fund 
acquired by purchase (not by exchange or dividend reinvestment) have been 
held for thirty days. There is no waiting period for exchanges of shares 
acquired by exchange or dividend reinvestment. 

ADDITIONAL INFORMATION REGARDING EXCHANGES. Purchases and exchanges should be 
made for investment purposes only. A pattern of frequent exchanges may be 
deemed by the Distributor to be abusive and contrary to the best interests of 
the Fund's other shareholders and, at the Distributor's discretion, may be 
limited by the Fund's refusal to accept additional purchases and/or exchanges 
from the investor. Although the Fund does not have any specific definition of 
what constitutes a pattern of frequent exchanges, and will consider all 
relevant factors in determining whether a particular situation is abusive and 
contrary to the best interests of the Fund and its other shareholders, 
investors should be aware that the Fund and each of the other Morgan Stanley 
Dean Witter Funds may in their discretion limit or otherwise restrict the 
number of times this Exchange Privilege may be exercised by any investor. Any 
such restriction will be made by the Fund on a prospective basis only, upon 
notice to the shareholder not later than ten days following such 
shareholder's most recent exchange. 

   The Exchange Privilege may be terminated or revised at any time by the 
Fund and/or any of such Morgan 

                               10           
<PAGE>
Stanley Dean Witter Funds for which shares of the Fund may be exchanged, upon 
such notice as may be required by applicable regulatory agencies (presently 
sixty days' prior written notice for termination or material revision), 
provided that six months' prior written notice of termination will be given 
to the shareholders who hold shares of the Exchange Funds pursuant to this 
Exchange Privilege, and provided further that the Exchange Privilege may be 
terminated or materially revised without notice under certain unusual 
circumstances. Shareholders maintaining margin accounts with DWR or another 
Selected Broker-Dealer are referred to their Morgan Stanley Dean Witter 
Financial Advisor or other Selected Broker-Dealer representative regarding 
restrictions on exchange of shares of the Fund pledged in their margin 
account. 

   The current prospectus for each fund describes its investment objective(s) 
and policies, and shareholders should obtain one and read it carefully before 
investing. Exchanges are subject to the minimum investment requirement of 
each Class of shares and any other conditions imposed by each fund. In the 
case of any shareholder holding a share certificate or certificates, no 
exchanges may be made until all applicable share certificates have been 
received by the Transfer Agent and deposited in the shareholder's account. An 
exchange will be treated for federal income tax purposes the same as a 
repurchase or redemption of shares, on which the shareholder may realize a 
capital gain or loss. However, the ability to deduct capital losses on an 
exchange may be limited in situations where there is an exchange of shares 
within ninety days after the shares are purchased. The Exchange Privilege is 
only available in states where an exchange may legally be made. 

   If DWR or another Selected Broker-Dealer is the current broker-dealer of 
record and its account numbers are part of the account information, 
shareholders may initiate an exchange of shares of the Fund for shares of any 
of the above Morgan Stanley Dean Witter Funds pursuant to this Exchange 
Privilege by contacting their Morgan Stanley Dean Witter Financial Advisor or 
other Selected Broker-Dealer representative (no Exchange Privilege 
Authorization Form is required). Other shareholders (and those shareholders 
who are clients of DWR or another Selected Broker-Dealer but who wish to make 
exchanges directly by writing or telephoning the Transfer Agent) must 
complete and forward to the Transfer Agent an Exchange Privilege 
Authorization Form, copies of which may be obtained from the Transfer Agent, 
to initiate an exchange. If the Authorization Form is used, exchanges may be 
made by contacting the Transfer Agent at (800) 869-NEWS (toll-free). 

   The Fund will employ reasonable procedures to confirm that exchange 
instructions communicated over the telephone are genuine. Such procedures 
include requiring various forms of personal identification such as name, 
mailing address, social security or other tax identification number and DWR 
or other Selected Broker-Dealer account number (if any). Telephone 
instructions will also be recorded. If such procedures are not employed, the 
Fund may be liable for any losses due to unauthorized or fraudulent 
instructions. 

   Telephone exchange instructions will be accepted if received by the 
Transfer Agent between 9:00 a.m. and 4:00 p.m. New York time, on any day the 
New York Stock Exchange is open. Any shareholder wishing to make an exchange 
who has previously filed an Exchange Privilege Authorization Form and who is 
unable to reach the Fund by telephone should contact his or her Morgan 
Stanley Dean Witter Financial Advisor or other Selected Broker-Dealer 
representative, if appropriate, or make a written exchange request. 
Shareholders are advised that during periods of drastic economic or market 
changes it is possible that the telephone exchange procedures may be 
difficult to implement, although this has not been the experience of the 
Morgan Stanley Dean Witter Funds in the past. 

   For further information regarding the Exchange Privilege, shareholders 
should contact their Morgan Stanley Dean Witter Financial Advisor or other 
Selected Broker-Dealer representative or the Transfer Agent. 

REDEMPTIONS AND REPURCHSES
- ----------------------------------------------------------------------------- 

REDEMPTIONS. Shares of the Fund may be redeemed through the Transfer Agent
(without redemption or other charge) on any day that the New York Stock Exchange
is open (see "Purchase of Fund Shares--Determination of Net Asset Value"). 
Redemptions will be effected at the net asset value per share next determined
after the receipt of a redemption request meeting the applicable requirements
described below.

1. BY CHECK 

The Transfer Agent will supply blank checks to any shareholder who has 
requested them on an Investment Application. The shareholder may make checks 
payable to the order of anyone in any amount not less than $500 (checks 
written in amounts under $500 will not be honored by the Transfer Agent). 
Shareholders must sign checks exactly as their shares are registered. If the 

                               11           
<PAGE>
account is a joint account, the check may contain one signature unless the 
joint owners have specifically specified on an Investment Application that 
all owners are required to sign checks. Only shareholders having accounts in 
which no share certificates have been issued will be permitted to redeem 
shares by check or enroll in the Systematic Withdrawal Plan. 

   Shares will be redeemed at their net asset value next determined (see 
"Purchase of Fund Shares--Determination of Net Asset Value") after receipt by 
the Transfer Agent of a check which does not exceed the value of the account. 
Payment of the proceeds of a check will normally be made on the next business 
day after receipt by the Transfer Agent of the check in proper form. Shares 
purchased by check (including a certified or bank cashier's check) are not 
normally available to cover redemption checks until fifteen days after 
receipt of the check used for investment by the Transfer Agent. The Transfer 
Agent will not honor a check in an amount exceeding the value of the account 
at the time the check is presented for payment. Since the dollar value of an 
account is constantly changing, it is not possible for a shareholder to 
determine in advance the total value of its account so as to write a check 
for the redemption of the entire account. For the same reason, a shareholder 
should not write a check for substantially all of the current value of the 
shares in its account with the Fund. 

2. BY TELEPHONE OR WIRE INSTRUCTIONS WITH 
   PAYMENT TO PREDESIGNATED BANK ACCOUNT 

A shareholder may redeem shares by telephoning or sending wire instructions 
to the Transfer Agent. Payment will be made by the Transfer Agent to the 
shareholder's bank account at any commercial bank designated by the 
shareholder in an Investment Application, by wire if the amount is $1,000 or 
more and the shareholder so requests, and otherwise by mail. Normally, the 
Transfer Agent will transmit payment the next business day following receipt 
of a request for redemption in proper form. Only shareholders having accounts 
in which no share certificates have been issued will be permitted to redeem 
shares by wire instructions. 

   DWR and any other participating Selected Broker-Dealers have informed the 
Distributor and the Fund that, on behalf of and as agent for their customers 
who are shareholders of the Fund, they will transmit to the Fund requests for 
redemption of shares owned by their customers. In such cases, the Transfer 
Agent will wire proceeds of redemptions to DWR's or other Selected 
Broker-Dealer's bank account for credit to the shareholders' accounts the 
following business day. DWR and other participating Selected Broker-Dealers 
have also informed the Distributor and the Fund that they do not charge for 
this service. 

   Redemption instructions must include the shareholder's name and account 
number and be wired or called to the Transfer Agent at 800-869-NEWS 
(toll-free). 

3. BY MAIL 

A shareholder may redeem shares by sending a letter to Morgan Stanley Dean 
Witter Trust FSB, P.O. Box 983, Jersey City, NJ 07303, requesting redemption 
and surrendering share certificates if any have been issued. 

   Redemption proceeds will be mailed to the shareholder at his or her 
registered address or mailed or wired to his or her predesignated bank 
account, as he or she may request. Proceeds of redemption may also be sent to 
some other person, as requested by the shareholder in accordance with the 
general redemption requirements listed below. 

GENERAL REDEMPTION REQUIREMENTS 

Written requests for redemption must be signed by the registered 
shareholder(s). If the proceeds are to be paid to anyone other than the 
registered shareholder(s) or sent to any address other than the shareholder's 
registered address or predesignated bank account, signatures must be 
guaranteed by an eligible guarantor acceptable to the Transfer Agent, 
(shareholders should contact the Transfer Agent for a determination as to 
whether a particular institution is such an eligible guarantor), except in 
the case of redemption by check. Additional documentation may be required 
where shares are held by a corporation, partnership, trust or other 
organization. With regard to shares of the Fund acquired pursuant to the 
Exchange Privilege, any applicable contingent deferred sales charge will be 
imposed upon the redemption of such shares (see "Purchase of Fund 
Shares--Exchange Privilege"). 

   If shares to be redeemed are represented by a share certificate, the 
request for redemption must be accompanied by the share certificate and a 
stock assignment form signed by the registered shareholder(s) exactly as the 
account is registered. Signatures must be guaranteed by a commercial bank or 
member firm of a domestic stock exchange. Additional documentation may be 
required where shares are held by a corporation, partnership, trust or other 
organization. 

   All requests for redemption should be sent to Morgan Stanley Dean Witter 
Trust FSB, P.O. Box 983, Jersey City, NJ 07303. 

                               12           
<PAGE>
   Generally, the Fund will attempt to make payment for all redemptions 
within one business day, and in no event later than seven days after receipt 
of such redemption request in proper form. However, if the shares being 
redeemed were purchased by check (including a certified or bank cashier's 
check), payment may be delayed for the minimum time needed to verify that the 
check used for investment has been honored (not more than fifteen days from 
the time of receipt of the check by the Transfer Agent). In addition, the 
Fund may postpone redemptions at certain times when normal trading is not 
taking place on the New York Stock Exchange. 

   Whether certificates are held by the shareholder or shares are held in a 
shareholder's account, if the proceeds are to be paid to any person other 
than the record owner, or if the proceeds are to be paid to a corporation 
(other than DWR or any other Selected Broker-Dealer for the account of the 
shareholder), partnership, trust or fiduciary, or sent to the shareholder at 
an address other than the registered address, signature(s) must be guaranteed 
by an eligible guarantor acceptable to the Transfer Agent (shareholders 
should contact the Transfer Agent for a determination as to whether a 
particular institution is such an eligible guarantor). A stock power may be 
obtained from any dealer or commercial bank. 

REPURCHASE. DWR and other Selected Broker-Dealers are authorized to 
repurchase shares represented by a share certificate which is delivered to 
any of their offices. Shares held in a shareholder's account without a share 
certificate may also be repurchased by DWR and other Selected Broker-Dealers 
upon the telephonic request of the shareholder. The repurchase price is the 
net asset value next determined (see "Purchase of Fund Shares--Determination 
of Net Asset Value") after such repurchase order is received. Payment for 
shares repurchased may be made by the Fund to DWR and other Selected 
Broker-Dealers for the account of the shareholder. The offers by DWR and 
other Selected Broker-Dealers to repurchase shares from shareholders may be 
suspended by them at any time. In that event, shareholders may redeem their 
shares through the Fund's Transfer Agent as set forth above under 
"Redemption." 

PAYMENT FOR SHARES REDEEMED OR REPURCHASED. Payment for shares presented for 
repurchase or redemption will be made by check within seven days after 
receipt by the Transfer Agent of the certificate and/or written request in 
good order. Such payment may be postponed or the right of redemption 
suspended under unusual circumstances. If the shares to be redeemed have 
recently been purchased by check, payment of the redemption proceeds may be 
delayed for the minimum time needed to verify that the check used for 
investment has been honored (not more than fifteen days from the time of 
receipt of the check by the Transfer Agent). Shareholders maintaining margin 
accounts with DWR or other Selected Broker-Dealers are referred to their 
Morgan Stanley Dean Witter Financial Advisor or other Selected Broker-Dealer 
representative regarding restrictions on redemption of shares of the Fund 
pledged in the margin account. 

REINSTATEMENT PRIVILEGE. A shareholder who has had his or her shares redeemed 
or repurchased and has not previously exercised this reinstatement privilege 
may, within 35 days after the date of the redemption or repurchase, reinstate 
any portion or all of the proceeds of such redemption or repurchase in shares 
of the Fund at net asset value next determined after a reinstatement request, 
together with the proceeds, is received by the Transfer Agent. 

INVOLUNTARY REDEMPTION. The Fund reserves the right to redeem, on 60 days' 
notice and at net asset value, the shares of any shareholder whose shares 
have a value of less than $1,000 as a result of redemptions or repurchases, 
or such lesser amount as may be fixed by the Trustees or, in the case of an 
account opened through EasyInvest (Service Mark), if after twelve months the 
shareholder has invested less than $10,000 in the account. However, before 
the Fund redeems such shares and sends the proceeds to the shareholder, it 
will notify the shareholder that the value of the shares is less than the 
applicable amount and allow him or her 60 days to make anadditional 
investment in an amount which will increase the value of his or her account 
to at least the applicable amount or more before the redemption is processed. 

DIVIDENDS, DISTRIBUTIONS AND TAXES 
- ----------------------------------------------------------------------------- 

   DIVIDENDS AND DISTRIBUTIONS. The Fund declares dividends from net 
investment income on each day the New York Stock Exchange is open for 
business. Such dividends are payable monthly. The Fund intends to distribute 
net capital gains, if any, at least once each year. The Fund may, however, 
elect to retain all or a portion of any such net long-term capital gains in 
any year. 

   All dividends and any capital gains distributions will be paid in 
additional Fund shares and automatically credited to the shareholder's 
account without issuance of a share certificate unless the shareholder 
requests in writing that all dividends or all dividends and distributions be 
paid in cash. (See "Shareholder Services--Automatic Investment of Dividends 
and Distributions".) 

                               13           
<PAGE>
TAXATION 

FEDERAL TAXES. Because the Fund intends to distribute substantially all of 
its net investment income and net short-term capital gains to shareholders 
and otherwise remain qualified as a regulated investment company under 
Subchapter M of the Internal Revenue Code, it is not expected that the Fund 
will be required to pay any federal income tax on such income and capital 
gains. Shareholders will normally have to pay federal income taxes on the 
dividends and capital gains distributions they receive from the Fund. 
Distributions of net investment income and net short-term capital gains are 
taxable to the shareholder as ordinary dividend income regardless of whether 
the shareholder receives such distributions in additional shares or in cash. 
Any dividends declared in the last quarter of any calendar year which are 
paid in the following year prior to February 1 will be deemed received by the 
shareholder in the prior year. 

   Long-term and short-term capital gains may be generated by the sale of 
portfolio securities by the Fund. Distributions of long-term capital gains, 
if any, are taxable to shareholders as long-term capital gains regardless of 
how long a shareholder has held the Fund's shares and regardless of whether 
the distribution is received in additional shares or in cash. 

   No portion of such distributions will be eligible for the dividends 
received deduction for corporations. To avoid being subject to a 31% federal 
backup withholding tax on taxable dividends, capital gains distributions and 
the proceeds of redemptions and repurchases, shareholders' taxpayer 
identification numbers must be furnished and certified as to accuracy. 

   Current federal law requires that a holder (such as the Fund) of a zero 
coupon security accrue a portion of the discount at which the security was 
purchased as income each year even though the Fund receives no interest 
payments in cash on the security during the year. Accordingly, the Fund may 
be required to pay out as an income distribution each year an amount which is 
greater than the total amount of cash receipts of interest the Fund actually 
received. Such distributions will be made from the available cash of the Fund 
or by liquidation of portfolio securities, if necessary. 

   The Fund may at times make payments from sources other than income or net 
capital gains. Payments from such sources will, in effect, represent a return 
of a portion of each shareholder's investment. All, or a portion, of such 
payments will not be taxable to shareholders. 

   After the end of the year, shareholders will receive full information on 
their dividends and capital gains distributions for tax purposes, including 
information as to the Federal tax status of dividends and distributions paid 
or retained by the Fund. 

   The foregoing discussion relates solely to the Federal income tax 
consequences of an investment in the Fund and dividends (where applicable) 
and distributions may also be subject to state and local taxes (see "State 
and Local Taxes" below); therefore, each shareholder is advised to consult 
his or her own tax advisor. 

STATE AND LOCAL TAXES. The Fund intends to invest only in U.S. Treasury 
obligations that provide interest income exempt from state and local taxes. 
Because all states presently allow the pass-through of federal obligation 
interest derived from specific federal obligations, it is anticipated that 
substantially all of the interest income generated by the Fund and paid out 
to shareholders as net investment income will be exempt from state and local 
taxation. Such investment income, however, will not be exempt from federal 
tax. Furthermore, any capital gains realized by the Fund will not be exempt 
from federal, and generally, state and local taxes. It should be noted that 
although the Fund intends to invest only in securities the pass-through 
income from which is believed exempt from state and local income taxes, it is 
possible that a state or local taxing authority may seek to tax an investor 
on a portion of the interest income of a particular government obligation 
held by the Fund. Shareholders are urged to consult their tax advisors with 
respect to specific questions regarding federal, state and local taxes. 

PERFORMANCE INFORMATION 
- ----------------------------------------------------------------------------- 

From time to time the Fund may quote its "yield" and/or its "total return" 
in advertisements and sales literature. Both the yield and the total return 
of the Fund are based on historical earnings and are not intended to indicate 
future performance. The yield of the Fund is computed by dividing the net 
investment income of the Fund over a 30-day period by an average value (using 
the average number of shares entitled to receive dividends and the net asset 
value per share at the end of the period), all in accordance with applicable 
regulatory requirements. Such amount is compounded for six months and then 
annualized for a twelve-month period to derive the yield of the Fund. The 
Fund may also quote its tax-equivalent yield, which is calculated by 
determining the pre-tax yield which after being taxed at a stated rate, would 
be equivalent to the yield determined as described above. 

   The "average annual total return" of the Fund refers to a figure 
reflecting the average annualized percentage increase (or decrease) in the 
value of an initial invest- 

                               14           
<PAGE>
ment in the Fund of $1,000 over periods of one, five and ten years or over 
the life of the Fund, if less than any of the foregoing. Average annual total 
return reflects all income earned by the Fund, any appreciation or 
depreciation of the assets of the Fund, and all expenses incurred by the 
Fund, for the stated periods. It also assumes reinvestment of all dividends 
and distributions paid by the Fund. 

   In addition to the foregoing, the Fund may advertise its total return over 
different periods of time by means of aggregate, average, year-by-year or 
other types of total return figures. The Fund may also advertise the growth 
of hypothetical investments of $10,000, $50,000 and $100,000 in shares of the 
Fund. 

   The Fund from time to time may also advertise its performance relative to 
certain performance rankings and indexes compiled by independent 
organizations (such as Lipper Analytical Services Inc.). 

ADDITIONAL INFORMATION 
- ----------------------------------------------------------------------------- 

VOTING RIGHTS. All shares of beneficial interest of the Fund are of $0.01 
par value and are equal as to earnings, assets and voting privileges. There 
are no conversion, pre-emptive or other subscription rights. In the event of 
liquidation, each share of beneficial interest of the Fund is entitled to its 
portion of all of the Fund's assets after all debts and expenses have been 
paid. The shares do not have cumulative voting rights. 

   The Fund is not required to hold Annual Meetings of Shareholders and in 
ordinary circumstances the Fund does not intend to hold such meetings. The 
Trustees may call Special Meetings of Shareholders for action by shareholder 
vote as may be required by the Act or the Declaration of Trust. The Trustees 
themselves have the power to alter the number and the terms of office of the 
Trustees and they may at any time lengthen their own terms or make their 
terms of unlimited duration and appoint their own successors, provided that 
always at least a majority of the Trustees has been elected by the 
shareholders of the Fund. Under certain circumstances the Trustees may be 
removed by action of the Trustees. The shareholders also have the right under 
certain circumstances to remove the Trustees. 

   Under Massachusetts law, shareholders of a business trust may, under 
certain circumstances, be held personally liable as partners for the 
obligations of the Fund. The Declaration of Trust contains an express 
disclaimer of shareholder liability for acts or obligations of the Fund and 
requires that notice of such disclaimer be given in each instrument entered 
into or executed by the Fund. Under the Declaration of Trust, indemnification 
shall be made out of the Fund's property for any shareholder held personally 
liable for the obligations of the Fund. Thus, the risk of a shareholder 
incurring financial loss on account of shareholder liability is limited to 
circumstances in which the Fund itself would be unable to meet its 
obligations. Given the above limitations on shareholder personal liability 
and the nature of the Fund's assets and operations, the possibility of the 
Fund being unable to meet its obligations is remote and thus, in the opinion 
of Massachusetts counsel to the Fund, the risk to Fund shareholders is 
remote. 

CODE OF ETHICS. Directors, officers and employees of MSDW Advisors, MSDW 
Services and MSDW Distributors are subject to a strict Code of Ethics adopted 
by those companies. The Code of Ethics is intended to ensure that the 
interests of shareholders and other clients are placed ahead of any personal 
interest, that no undue personal benefit is obtained from a person's 
employment activities and that actual and potential conflicts of interest are 
avoided. To achieve these goals and comply with regulatory requirements, the 
Code of Ethics requires, among other things, that personal securities 
transactions by employees of the companies be subject to an advance clearance 
process to monitor that no Morgan Stanley Dean Witter Fund is engaged at the 
same time in a purchase or sale of the same security. The Code of Ethics bans 
the purchase of securities in an initial public offering, and also prohibits 
engaging in futures and options transactions and profiting on short-term 
trading (that is, a purchase within sixty days of a sale or a sale within 
sixty days of a purchase) of a security. In addition, investment personnel 
may not purchase or sell a security for their personal account within thirty 
days before or after any transaction in any Morgan Stanley Dean Witter Fund 
managed by them. Any violations of the Code of Ethics are subject to 
sanctions, including reprimand, demotion or suspension or termination of 
employment. The Code of Ethics comports with regulatory requirements and the 
recommendations in the 1994 report by the Investment Company Institute 
Advisory Group on Personal Investing. 

MASTER/FEEDER CONVERSION. The Fund reserves the right to seek to achieve its 
investment objective by investing all of its investable assets in a 
diversified, open-end management investment company having the same 
investment objective and policies and substantially the same investment 
restrictions as those applicable to the Fund. 

SHAREHOLDER INQUIRIES. All inquiries regarding the Fund should be directed to 
the Fund at the telephone numbers or address set forth on the front cover of 
this Prospectus. 

                               15           
<PAGE>
MORGAN STANLEY DEAN WITTER 
SHORT-TERM U.S. TREASURY TRUST 
TWO WORLD TRADE CENTER 
NEW YORK, NEW YORK 10048 

TRUSTEES 

Michael Bozic 
Charles A. Fiumefreddo 
Edwin J. Garn 
John R. Haire 
Wayne E. Hedien 
Dr. Manuel H. Johnson 
Michael E. Nugent 
Philip J. Purcell 
John L. Schroeder 

OFFICERS 

Charles A. Fiumefreddo 
Chairman and Chief Executive Officer 
Barry Fink 
Vice President, Secretary and 
General Counsel 
Rajesh K. Gupta 
Vice President 
Thomas F. Caloia 
Treasurer 

CUSTODIAN 

The Bank of New York 
90 Washington Street 
New York, New York 10286 

TRANSFER AGENT AND 
DIVIDEND DISBURSING AGENT 

Morgan Stanley Dean Witter Trust FSB 
Harborside Financial Center 
Plaza Two 
Jersey City, New Jersey 07311 

INDEPENDENT ACCOUNTANTS 

PricewaterhouseCoopers LLP 
1177 Avenue of the Americas 
New York, New York 10036 

INVESTMENT MANAGER 

Morgan Stanley Dean Witter Advisors Inc. 







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