CASCADE NATURAL GAS CORP
424B5, 1996-08-15
NATURAL GAS DISTRIBUTION
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<PAGE>
PROSPECTUS SUPPLEMENT                                             RULE 424(b)(5)
(To Prospectus dated July 24, 1996)                           File No. 333-08501
 
                                1,350,000 SHARES
 
                        CASCADE NATURAL GAS CORPORATION
 
                                  COMMON STOCK
                                 --------------
 
    On  August 13,  1996, the last  reported sale  price of the  Common Stock of
Cascade Natural Gas Corporation (the "Company")  on the New York Stock  Exchange
was  $15 1/4 per share. The Common Stock of the Company is listed for trading on
the New York Stock Exchange under the symbol "CGC."
                              -------------------
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 SUPPLEMENT
       OR THE PROSPECTUS TO WHICH IT RELATES. ANY REPRESENTATION TO  THE
                        CONTRARY IS A CRIMINAL OFFENSE.
 
<TABLE>
<CAPTION>
                                            PRICE TO                  UNDERWRITING                PROCEEDS TO
                                             PUBLIC                   DISCOUNT (1)                COMPANY (2)
<S>                                <C>                         <C>                         <C>
Per Share........................            $15.25                      $.685                      $14.565
Total (3)........................         $20,587,500                   $924,750                  $19,662,750
</TABLE>
 
(1)  The  Company  has  agreed to  indemnify  the  Underwriters  against certain
    liabilities, including certain liabilities under the Securities Act of 1933,
    as amended. See "Underwriting."
 
(2) Before deducting expenses payable by the Company estimated at $150,000.
 
(3) The Company has  granted the Underwriters an  option, exercisable within  30
    days after the date of this Prospectus Supplement, to purchase up to 202,500
    additional  shares of Common Stock (the "Option Shares") from the Company at
    the Price  to  Public,  less  the Underwriting  Discount,  solely  to  cover
    overallotments,  if any.  If all  of such  Option Shares  are purchased, the
    total Price to Public, Underwriting  Discount, and Proceeds to Company  will
    be    $23,675,625,   $1,063,463,   and    $22,612,162,   respectively.   See
    "Underwriting."
 
                              -------------------
 
    The shares are offered by the Underwriters, subject to prior sale, when,  as
and  if issued to and accepted by them  and subject to approval of certain legal
matters by counsel  for the Underwriters  and to certain  other conditions.  The
Underwriters  reserve the right to withdraw, cancel, or modify such offer and to
reject orders in whole or  in part. It is expected  that delivery of the  shares
will be made in New York, New York, on or about August 19, 1996.
 
                              -------------------
 
MERRILL LYNCH & CO.
                           A.G. EDWARDS & SONS, INC.
                                                                 RAGEN MACKENZIE
                                                     INCORPORATED
 
                                  ------------
 
           The date of this Prospectus Supplement is August 13, 1996.
<PAGE>
Map  of Oregon and  Washington showing generalized service  area of Cascade, and
the communities served, district offices, and gas pipelines.
 
                                   [MAP]
 
    IN CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR  EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE COMMON STOCK OF
THE  COMPANY AT  A LEVEL ABOVE  THAT WHICH  MIGHT OTHERWISE PREVAIL  IN THE OPEN
MARKET. SUCH TRANSACTIONS  MAY BE  EFFECTED ON THE  NEW YORK  STOCK EXCHANGE  OR
OTHERWISE. SUCH STABILIZING, IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.
 
                                      S-2
<PAGE>
                              SUMMARY INFORMATION
 
    The  following material, which is presented herein solely to furnish limited
introductory information regarding  the Company,  has been selected  from or  is
based  upon  the  detailed  information and  financial  statements  included and
incorporated by reference into this  Prospectus Supplement and the  accompanying
Prospectus,  is qualified in its entirety  by reference thereto, and, therefore,
should be read together therewith.
 
                                  THE OFFERING
 
<TABLE>
<S>                                            <C>
Company......................................  Cascade Natural Gas Corporation
Securities offered...........................  1,350,000 shares of Common Stock (excluding
                                               up to 202,500 Option Shares)
Use of proceeds..............................  To repay short-term debt incurred in
                                               connection with the Company's capital
                                                construction program and to fund future
                                                capital construction. The Company's
                                                short-term debt bears interest at market
                                                rates. At August 13, 1996, the Company had
                                                $15,000,000 of short-term debt outstanding
                                                that bore interest at a weighted-average
                                                interest rate of 5.65% per annum. See "Use
                                                of Proceeds" in the accompanying Prospectus.
Shares of Common Stock outstanding after
 offering....................................  Approximately 10,600,000 (excluding up to
                                                202,500 Option Shares)
Price range on the New York Stock Exchange
 from August 14, 1995 through August 13,
 1996........................................  High: $17 1/2; Low: $13 3/8
Last reported sale price on the New York
 Stock Exchange on August 13, 1996...........  $15 1/4
New York Stock Exchange symbol...............  CGC
Indicated current annual dividend rate.......  $0.96 per share
Book value per share at June 30, 1996........  $9.89
 
                                        THE COMPANY
 
Business.....................................  A public utility engaged in natural gas
                                               distribution in the States of Oregon and
                                                Washington
Estimated population of service area.........  Approximately 724,000
Customers at June 30, 1996...................  151,779
Compound average annual growth in number of
 customers, 1991-95..........................  7.1%
Composition of operating margin for the
 twelve months ended June 30, 1996...........  Residential customers, 36.4%; commercial
                                                customers, 27.7%; firm industrial customers,
                                                4.7%; interruptible customers, 2.7%;
                                                noncore, large volume customers, 28.5%
</TABLE>
 
                                      S-3
<PAGE>
                    SUMMARY FINANCIAL AND OPERATING DATA (1)
 
<TABLE>
<CAPTION>
                               TWELVE MONTHS ENDED
                                     JUNE 30,                        YEAR ENDED DECEMBER 31, (2)
                              ----------------------  ----------------------------------------------------------
                                 1996        1995        1995        1994        1993        1992        1991
                              ----------  ----------  ----------  ----------  ----------  ----------  ----------
                                            (DOLLAR AMOUNTS IN THOUSANDS EXCEPT PER SHARE AMOUNTS)
<S>                           <C>         <C>         <C>         <C>         <C>         <C>         <C>
INCOME STATEMENT DATA:
  Revenues..................  $ 184,500   $ 190,725   $ 182,744   $ 192,410   $ 187,454   $ 152,466   $ 154,312
  Operating margin..........     70,563      66,766      68,406      62,827      62,859      53,149      54,047
  Earnings before preferred
   dividends................      7,896(3)     7,074      7,732       5,760       9,103       4,843       7,651
  Net earnings per common
   share....................       0.81(3)      0.74       0.80        0.60        1.08        0.64        1.14
  Dividends per common
   share....................       0.96        0.96        0.96        0.96        0.94        0.93        0.90
  Dividend payout ratio.....        119%        130%        120%        161%         87%        146%         79%
  Average common shares
   outstanding (000's)......      9,115       8,874       8,997       8,707       7,915       6,681       6,587
OPERATING DATA:
  Total customers (end of
   period)..................    151,779     143,125     151,005     142,839     132,668     123,356     114,734
  Total throughput (in
   thousands of therms).....    957,263     952,289     953,893     905,719     738,862     605,137     558,821
CAPITAL EXPENDITURES........     35,515      31,838      37,637      27,251      32,990      35,335      19,669
HEATING DEGREE DAYS (4).....      5,521       5,759       5,238       5,463       6,136       5,073       5,392
  Percentage above/(below)
   normal...................      (2.7)%        1.5%      (7.7)%      (3.7)%        8.1%     (10.6)%      (5.0)%
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                            JUNE 30, 1996
                                                                            ----------------------------------------------
                                                                                    ACTUAL             AS ADJUSTED (5)
                                                                            ----------------------  ----------------------
                                                                             AMOUNT      PERCENT     AMOUNT      PERCENT
                                                                            ---------  -----------  ---------  -----------
                                                                                        (DOLLARS IN THOUSANDS)
<S>                                                                         <C>        <C>          <C>        <C>
BALANCE SHEET DATA:
  Common stock and paid-in capital........................................  $  81,878        37.8%  $ 101,391        46.1%
  Retained earnings.......................................................      9,621         4.4       9,621         4.4
                                                                            ---------       -----   ---------       -----
    Total common stockholders' equity.....................................     91,499        42.2     111,012        50.5
  Preferred stock.........................................................      6,851         3.2       6,851         3.1
  Long-term debt (including current portion)..............................    101,850        47.0     101,850        46.4
  Short-term debt.........................................................     16,500         7.6      --          --
                                                                            ---------       -----   ---------       -----
    Total capitalization..................................................  $ 216,700       100.0%  $ 219,713       100.0%
                                                                            ---------       -----   ---------       -----
                                                                            ---------       -----   ---------       -----
</TABLE>
 
- ------------------------------
(1)  The Summary Financial and Operating Data  for the years ended December  31,
     1991  through 1995, other than the dividend payout ratio and the data under
     "Operating Data" and "Heating Degree Days," was derived from the  Company's
     audited  financial  statements.  The  financial data  with  respect  to the
     twelve-month periods  ended  June 30,  1995  and 1996,  is  unaudited,  but
     includes  all adjustments which  management considers necessary  for a fair
     presentation of its results for the periods.
 
(2)  The Company's 1996 fiscal year will end on September 30, 1996, resulting in
     a nine-month transition year. The change in fiscal year conforms to  common
     industry  practice  and will  cause each  heating season  to fall  within a
     single fiscal year.
 
(3)  Earnings for  the twelve  months  ended June  30,  1996, include  a  second
     quarter  1996 after-tax charge of $753,000,  or $.08 per share. See "Recent
     Developments."
 
(4)  A normal year  consists of 5,675  heating degree days,  based on a  30-year
     average  of  heating degree  days (1951-1980).  One  heating degree  day is
     accumulated for each whole degree that the  mean of the high and low  daily
     temperatures is below 65 DEG. F.
 
(5)  Adjusted  for the sale of the Common  Stock (excluding up to 202,500 Option
     Shares) and assuming the  repayment of outstanding  short-term debt with  a
     portion of the net proceeds thereof.
 
                                      S-4
<PAGE>
                                  THE COMPANY
 
    Cascade  Natural Gas Corporation (the "Company" or "Cascade") is a local gas
distribution utility with  operations in  the States of  Washington and  Oregon.
Cascade  currently serves  over 151,700 customers  in 90 communities  in the two
states with approximately 81% of its  deliveries in the State of Washington.  As
of   June  30,  1996,  Cascade  served  127,449  residential  customers,  23,847
commercial customers,  324  firm  industrial  customers,  and  24  interruptible
customers,  all  of which  are  classified as  core  customers, as  well  as 135
noncore, large volume customers.  The number of customers  served by Cascade  is
affected  by seasonality.  As of June  30, 1996, there  were approximately 3,000
customers that had temporarily discontinued service due to warmer weather. These
customers are not  included in the  numbers of customers  set forth above.  Core
customers  are those who  elect to purchase  traditional fully bundled services,
which primarily include gas supply and transportation services from the Company;
noncore customers, on the other hand, select supply and transportation  services
from  the Company's menu of unbundled services. The Company's noncore industrial
customers   are   served   either   at    tariffed   rates   or   pursuant    to
specially-negotiated  contracts that require regulatory approval. For the twelve
months ended June 30, 1996, the  percentage of operating margin attributable  to
each  customer class  was as  follows: residential  customers, 36.4%; commercial
customers, 27.7%;  firm  industrial customers,  4.7%;  interruptible  customers,
2.7%; and noncore, large volume customers, 28.5%.
 
    Cascade  has experienced significant growth in its core customer base during
the last  five years  due primarily  to customer  conversion from  other  energy
sources  to gas space and water heating  and new residential construction in its
service territory. Cascade's residential customer  base increased by 8.3%,  8.3%
and  6.1% during 1993, 1994 and 1995,  respectively. At June 30, 1996, Cascade's
residential customer  count was  6.4%  higher than  at  June 30,  1995.  Cascade
believes  its  current  residential growth  rate  is  one of  the  highest among
companies in the local gas distribution business in the United States.
 
                              RECENT DEVELOPMENTS
 
WASHINGTON RATE SETTLEMENT
 
    On July 22,  1996, the  Washington Utilities  and Transportation  Commission
(the  "WUTC")  issued  its final  order  reflecting  the terms  of  a negotiated
settlement among the Company, the WUTC  staff, the Public Counsel for the  State
of  Washington, and the  Northwest Industrial Gas Users,  of three separate rate
applications filed by the Company. The  new rates are effective August 1,  1996.
The order approves the first general rate increase in the State of Washington by
the  Company since  1986, estimated to  increase revenues  by approximately $3.8
million in the first  year. Offsetting the general  rate increase for the  first
four  years are technical credits for  core customers amounting to approximately
$263,000 in the first year and increasing to $304,000 by the fourth year.  Other
elements  of the approved settlement include:  (i) increases in monthly customer
service charges per core customer by $1.00 on August 1 in each of 1997 and 1998,
offset by  simultaneous decreases  in  charges to  non-core customers  in  equal
aggregate  amounts;  (ii) the  refund  to core  customers  of deferred  gas cost
reductions estimated to aggregate  $1,445,000 annually for  four years, and  the
refund  of an additional $13  million in deferred gas  cost savings plus accrued
interest beginning in four years,  neither of which will  have an effect on  the
Company's  earnings; (iii) an agreement by the  Company not to apply for another
general rate increase for at least three years from August 1, 1996; and (iv)  an
agreement by the Company to prepare a plan by November 30, 1996, to reduce meter
reading and billing expenses, adjusted for inflation and growth, by more than 30
percent within three years.
 
    Concurrent  with the August 1, 1996, effective date of new Washington rates,
Cascade will commence the amortization of deferred postretirement benefits other
than pensions ("PBOP"). Consistent  with the WUTC's  policy statement issued  in
1992  regarding these costs, PBOP expenses attributable to Washington operations
in excess of  amounts previously charged  on a "pay-as-you-go"  basis have  been
deferred  since  1993. The  amount of  the incremental  expense to  be recorded,
including  amortization,   will  be   approximately  $1.5   million  per   year.
Amortization  will be completed at December  31, 2002. Cascade has accounted for
 
                                      S-5
<PAGE>
PBOP expense allocable  to Oregon  customers consistent with  the provisions  of
Statement  of Financial Accounting Standards No. 106, "Employers' Accounting for
Postretirement Benefits Other than Pensions," without any deferral.
 
RECENT OPERATING RESULTS
 
    Cascade's second quarter 1996 results were a net loss of $1,887,000, or $.20
per share, compared  to a net  loss of $1,019,000,  or $.11 per  share, for  the
comparable  period of 1995. Although Cascade normally experiences a seasonal net
loss in  the quarter  ended June  30,  the higher  loss in  the 1996  period  is
primarily  due to the establishment of  a $1,158,000 reserve for unrecovered gas
costs resulting in an after-tax charge  against income of $753,000, or $.08  per
share.  The reserve resulted from management's determination that such costs are
more appropriately recoverable  through noncore gas  commodity sales, which  are
dependent  on  future competitive  conditions  for large  volume  industrial gas
supplies, rather than  from the  more certain  source of  recovery through  rate
increases to core customers.
 
    The  1996 second quarter operating margins  were also negatively affected by
approximately $360,000 due to certain large industrial noncore customers  opting
for special contracts instead of tariffed rates. Large industrial customers have
the  option  of  installing  their own  pipeline  connection  to  the interstate
pipeline and thereby bypassing Cascade.  In such instances, Cascade attempts  to
negotiate  mutually satisfactory special contracts  with such customers, subject
to regulatory approval. Cascade expects that this trend will continue as the gas
distribution business becomes more competitive.
 
    For the six  months ended June  30, 1996, net  earnings were $4,752,000,  or
$.52  per share, compared to  $4,578,000, or $.51 per  share, for the six months
ended June 30, 1995.
 
                                  SEASONALITY
 
    Cascade's results of operations  are significantly affected by  seasonality.
Gas  revenues are greatest in  the winter heating season  from October to April.
Accordingly, revenues and earnings are higher in the quarters ended December  31
and  March 31. For the  years 1995, 1994, and  1993, the percentages of revenues
attributable to the winter  season were 66.5%,  66.2%, and 64.5%,  respectively.
The  percentages of  net earnings attributable  to operations  during the winter
season were 148.3% in 1995, 174.7% in 1994, and 136.4% in 1993.
 
    Tariffs for residential, commercial and firm industrial customers are  based
on  normal weather, defined  as 20-year historical  average temperatures. To the
extent temperatures are warmer or colder than normal, the Company's results  are
affected.  For the years 1986 through 1995, temperatures were warmer than normal
in the Company's service territory except for one year, 1993.
 
                                      S-6
<PAGE>
                     COMMON STOCK PRICE RANGE AND DIVIDENDS
 
    The following table sets  forth for the periods  indicated the high and  low
closing  prices per share for the Common Stock as reported on the New York Stock
Exchange and the cash dividends paid per share of Common Stock.
 
<TABLE>
<CAPTION>
                                                               PRICE
                                                        --------------------    CASH
                                                          HIGH        LOW     DIVIDENDS
                                                        ---------  ---------  ---------
<S>                                                     <C>        <C>        <C>
1994
  First quarter.......................................  18 1/8     15 7/8     .23 2/3
  Second quarter......................................  16 3/4     14         .24
  Third quarter.......................................  15 13/16   13 1/4     .24
  Fourth quarter......................................  15 1/2     12 3/4     .24
1995
  First quarter.......................................  14 7/8     13 1/4     .24
  Second quarter......................................  15         13 1/2     .24
  Third quarter.......................................  15 1/2     13 1/2     .24
  Fourth quarter......................................  17 3/8     14 5/8     .24
1996
  First quarter.......................................  16 5/8     15         .24
  Second quarter......................................  16         13 3/8     .24
  Third quarter (through August 13, 1996).............  15 1/2     13 7/8     .24
</TABLE>
 
    The last reported sale price of the Common Stock on August 13, 1996, on  the
New  York Stock Exchange was $15 1/4.  There were 9,321 record holders of Common
Stock at June 30, 1996. The book value of the Common Stock on June 30, 1996, was
$9.89 per share.
 
    The Company declared a regular quarterly  dividend of $.24 per share on  the
Common  Stock on June 25,  1996, payable on August  15, 1996, to shareholders of
record on July 12, 1996.
 
    The Company  has paid  consecutive quarterly  cash dividends  on its  Common
Stock  since  1964, except  in  the years  1976, 1977,  and  1978, when  it paid
dividends in shares of  Common Stock in  lieu of cash  every other quarter.  The
timing and amount of future dividends are within the discretion of the Company's
board   of  directors  and  will  depend  on  the  Company's  earnings,  capital
requirements, financial  condition  and  other factors.  The  Company  does  not
contemplate  any increase in its present annual  dividend rate of $.96 per share
at least until  its net earnings  result in a  dividend payout ratio  of 75%  or
less.
 
    The   Company's   bank  credit   agreements  contain   provisions  requiring
maintenance of a minimum  net worth. Under these  provisions, at June 30,  1996,
approximately  $19,541,000 was available  for dividends on  the Common Stock and
the Company's preferred stock.
 
    Under the Company's Dividend Reinvestment Plan, holders of Common Stock  may
elect  to have the dividends on  their shares automatically reinvested in Common
Stock and may  invest in additional  shares of Common  Stock by making  optional
cash  payments. See "Description of Common  Stock -- Dividend Reinvestment Plan"
in the accompanying Prospectus.
 
                           FORWARD-LOOKING STATEMENTS
 
    Statements contained in  or incorporated by  reference into this  Prospectus
Supplement or the accompanying Prospectus which are not historical in nature are
forward-looking   statements  within  the  meaning  of  the  Private  Securities
Litigation Reform Act of 1995.  Forward-looking statements are subject to  risks
and  uncertainties that  may cause actual  future results  to differ materially.
Such risks and uncertainties with respect to the Company include its ability  to
successfully  implement internal performance goals, competition from alternative
forms of energy, the effects of state and federal regulation, performance issues
with key natural gas  suppliers, the capital-intensive  nature of the  Company's
business,  the other factors discussed  under the headings "Recent Developments"
and "Seasonality" herein  and "Certain  Issues Facing  the Company  and the  Gas
Distribution  Industry"  in the  accompanying  Prospectus, and  other  risks and
uncertainties discussed in the Company's  reports filed with the Securities  and
Exchange  Commission, including its 1995 Form  10-K and 1996 second quarter Form
10-Q. See "Incorporation of Certain Documents by Reference" in the  accompanying
Prospectus.
 
                                      S-7
<PAGE>
                                  UNDERWRITING
 
    Subject  to the terms and conditions  set forth in an underwriting agreement
(the "Underwriting Agreement"), the  Company has agreed to  sell to each of  the
Underwriters named below (the "Underwriters"), and each of the Underwriters, for
whom  Merrill Lynch, Pierce,  Fenner & Smith Incorporated,  A.G. Edwards & Sons,
Inc., and  Ragen  MacKenzie  Incorporated are  acting  as  representatives  (the
"Representatives"),  has severally agreed to  purchase, the respective number of
shares of Common Stock  set forth opposite its  name below. In the  Underwriting
Agreement, the Underwriters have agreed, subject to the terms and conditions set
forth  therein,  to  purchase all  of  the shares  of  Common Stock  if  any are
purchased.
 
<TABLE>
<CAPTION>
                                                                                   NUMBER OF
          UNDERWRITER                                                                SHARES
                                                                                   ----------
<S>                                                                                <C>
Merrill Lynch, Pierce, Fenner & Smith
          Incorporated...........................................................     284,000
A.G. Edwards & Sons, Inc.........................................................     283,000
Ragen MacKenzie Incorporated.....................................................     283,000
Dean Witter Reynolds Inc.........................................................      52,000
PaineWebber Incorporated.........................................................      52,000
Piper Jaffray Inc................................................................      52,000
Prudential Securities Incorporated...............................................      52,000
Smith Barney Inc.................................................................      52,000
Black & Company, Inc.............................................................      30,000
Crowell, Weedon & Co.............................................................      30,000
Dain Bosworth Incorporated.......................................................      30,000
Jensen Securities Co.............................................................      30,000
Edward D. Jones & Co.............................................................      30,000
Pacific Crest Securities.........................................................      30,000
Paulson Investment Company, Inc..................................................      30,000
Wedbush Morgan Securities........................................................      30,000
                                                                                   ----------
          Total..................................................................   1,350,000
                                                                                   ----------
                                                                                   ----------
</TABLE>
 
    The Representatives have advised the  Company that the Underwriters  propose
initially  to  offer the  shares of  Common Stock  to the  public at  the public
offering price set forth on the cover page of this Prospectus Supplement, and to
certain dealers at such price less a concession not in excess of $.38 per share.
The Underwriters may  allow, and  such dealers may  reallow, a  discount not  in
excess  of $.10  per share  to certain other  dealers. After  the initial public
offering, the public offering price, concession and discount may be changed.
 
    The Company has granted  the Underwriters an  option, exercisable within  30
days  after the date  of this Prospectus  Supplement, to purchase  up to 202,500
Option Shares solely for the purpose of covering overallotments, if any, at  the
price  to public less the  underwriting discount set forth  on the cover page of
this Prospectus Supplement. To  the extent that  the Underwriters exercise  this
option,  each  Underwriter  will  be  severally  committed,  subject  to certain
conditions,  to  purchase  an  additional  number  of  shares  of  Common  Stock
proportionate to such Underwriter's initial commitment as indicated in the table
above.
 
    Certain  Underwriters and certain affiliates  thereof engage in transactions
with and perform  services for the  Company and its  affiliates in the  ordinary
course  of  business.  Brooks G.  Ragen,  one of  the  members of  the  Board of
Directors of  the  Company,  is  Chairman and  Chief  Executive  Officer  and  a
shareholder of Ragen MacKenzie Incorporated.
 
    The  Company  has  agreed  to  indemnify  the  Underwriters  against certain
liabilities, including certain liabilities under the Securities Act of 1933,  as
amended,  or contribute to payments the Underwriters  may be required to make in
respect thereof.
 
                                      S-8
<PAGE>
PROSPECTUS
 
                        CASCADE NATURAL GAS CORPORATION
 
                                  COMMON STOCK
 
                               ($1.00 PAR VALUE)
 
    Cascade  Natural Gas Corporation ("the Company"  or "Cascade") may offer and
sell up to 3,500,000 shares of its Common Stock, $1.00 par value per share  (the
"Common  Stock"),  in  one  or more  issuances  at  prices and  on  terms  to be
determined at the time of  sale. The number of  shares being sold, the  purchase
price,  the initial public offering price, the  proceeds to the Company, and the
other terms of the offering of such shares of Common Stock will be set forth  in
a Prospectus Supplement to be delivered at the time of any such offering.
 
    The  Common Stock of the Company is listed for trading on the New York Stock
Exchange under the symbol "CGC." The shares of Common Stock offered hereby  will
be listed, subject to notice of issuance, on such exchange.
 
                            ------------------------
 
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.
 
                            ------------------------
 
    The  shares  of Common  Stock offered  hereby  may be  sold directly  by the
Company or through agents, underwriters or dealers designated from time to time.
If any agents of  the Company or  any underwriters are involved  in the sale  of
shares  of Common Stock in respect of  which this Prospectus is being delivered,
the names  of  such agents  or  underwriters  and any  applicable  discounts  or
commissions  with respect to such shares of  Common Stock will also be set forth
in a Prospectus Supplement.
 
                 THE DATE OF THIS PROSPECTUS IS JULY 24, 1996.
<PAGE>
    IN CONNECTION WITH THIS OFFERING,  THE UNDERWRITERS MAY OVERALLOT OR  EFFECT
TRANSACTIONS  WHICH STABILIZE  OR MAINTAIN  THE MARKET  PRICE OF  THE SECURITIES
OFFERED HEREBY AT A LEVEL ABOVE THAT  WHICH MIGHT OTHERWISE PREVAIL IN THE  OPEN
MARKET.  SUCH TRANSACTIONS  MAY BE  EFFECTED ON THE  NEW YORK  STOCK EXCHANGE OR
OTHERWISE. SUCH STABILIZING, IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.
 
                             AVAILABLE INFORMATION
 
    The Company is subject to  the informational requirements of the  Securities
Exchange  Act  of  1934, as  amended  (the  "Exchange Act"),  and  in accordance
therewith files  reports,  proxy  statements  and  other  information  with  the
Securities  and  Exchange  Commission (the  "Commission").  Such  reports, proxy
statements and  other information  can be  inspected and  copied at  the  public
reference  facilities maintained  by the Commission  at 450  Fifth Street, N.W.,
Washington, D.C. 20549; Seven World Trade Center, Suite 1300, New York, New York
10048; and 500 West Madison Street, Suite 1400, Chicago, Illinois 60661.  Copies
of  such materials can be  obtained at prescribed rates  by mail from the Public
Reference Section of the Commission at 450 Fifth Street, N.W., Washington,  D.C.
20549.  Such material can also be inspected and copied at the offices of the New
York Stock Exchange, 20 Broad Street,  New York, New York 10005. The  Commission
maintains  an Internet  Web site  that contains  reports, proxy  and information
statements  and  other  information  regarding  reporting  companies  under  the
Exchange Act. The address of such Internet Web site is http:// www.sec.gov.
 
    The  Company has filed with the  Commission a Registration Statement on Form
S-3 with respect to  the Common Stock offered  hereby. This Prospectus does  not
contain all of the information in the Registration Statement and in the exhibits
thereto,  certain portions of which have been  omitted as permitted by the rules
and regulations of the Commission. For  further information with respect to  the
Company  and  the  Common  Stock  offered  hereby,  reference  is  made  to  the
Registration Statement, including the schedules and exhibits thereto, which  may
be  inspected without charge  at the principal  office of the  Commission at 450
Fifth Street, N.W., Washington, D.C. 20549  and copies of which may be  obtained
from the Commission at prescribed rates.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
    The  following  documents heretofore  filed with  the Commission  are hereby
incorporated by reference in this Prospectus, and  shall be deemed to be a  part
hereof:
 
       1.  The  Company's Annual Report  on Form 10-K for  the fiscal year ended
           December 31, 1995.
 
       2.  The Company's Quarterly  Report on  Form 10-Q for  the quarter  ended
           March 31, 1996.
 
       3.  The Company's Current Reports on Form 8-K dated February 7, 1996, and
           July 18, 1996.
 
       4.  The  description of the Company's  Common Stock and related preferred
           stock purchase rights included as Exhibit 99 to the Company's Current
    Report on Form 8-K dated July 18, 1996.
 
    All documents filed by the Company pursuant to Sections 13(a), 13(c), 14  or
15(d)  of the Exchange  Act after the date  of this Prospectus  and prior to the
termination of this offering shall be deemed to be incorporated by reference  in
this  Prospectus  and to  be  a part  hereof  from the  date  of filing  of such
documents. The documents  described above, and  such later-filed documents,  are
hereinafter  referred to as "Incorporated Documents." Any statement contained in
an Incorporated  Document shall  be  deemed to  be  modified or  superseded  for
purposes  of this Prospectus to the extent  that a statement contained herein or
in any other  subsequently filed  Incorporated Document  modifies or  supersedes
such  statement.  Any such  statement  so modified  or  superseded shall  not be
deemed, except  as so  modified or  superseded,  to constitute  a part  of  this
Prospectus.
 
    THE  INFORMATION  RELATING  TO  THE  COMPANY  CONTAINED  IN  THIS PROSPECTUS
SUMMARIZES, IS BASED UPON,  OR REFERS TO,  INFORMATION AND FINANCIAL  STATEMENTS
CONTAINED  IN  ONE  OR MORE  OF  THE INCORPORATED  DOCUMENTS;  ACCORDINGLY, SUCH
INFORMATION CONTAINED HEREIN IS QUALIFIED IN  ITS ENTIRETY BY REFERENCE TO  SUCH
INCORPORATED DOCUMENTS AND SHOULD BE READ IN CONJUNCTION THEREWITH.
 
    The  Company undertakes to provide  without charge to each  person to whom a
copy of this Prospectus has been delivered, upon the written or oral request  of
any  such person,  a copy of  the documents  referred to above,  which have been
incorporated in  this  Prospectus by  reference,  other than  exhibits  to  such
documents  (unless such exhibits are specifically incorporated by reference into
documents.) Requests for such copies should be directed to: J.D. Wessling,  Vice
President-Finance,  Cascade Natural Gas Corporation,  222 Fairview Avenue North,
Seattle, Washington 98109 (telephone 206-624-3900).
 
                                       2
<PAGE>
                                  THE COMPANY
 
    Incorporated  in 1953  in the  State of Washington,  Cascade is  a local gas
distribution utility with  operations in  the States of  Washington and  Oregon.
Cascade  currently serves  over 151,000 customers  in 90 communities  in the two
states with approximately 81% of its  deliveries in the State of Washington.  As
of  March  31,  1996,  Cascade  served  128,653  residential  customers,  23,993
commercial customers,  328  firm  industrial  customers,  and  25  interruptible
customers, all of which are classified as core customers, and 121 noncore, large
volume  customers. Core  customers are those  who elect  to purchase traditional
fully bundled services,  which primarily include  gas supply and  transportation
services  from the Company; noncore customers,  on the other hand, select supply
and transportation services from the  Company's menu of unbundled services.  The
Company's  noncore industrial customers are served at tariffed rates or pursuant
to specially-negotiated  contracts which  require regulatory  approval. For  the
twelve  months  ended  March  31,  1996,  the  percentage  of  operating  margin
attributable to each customer class was as follows: residential customers,  35%;
commercial   customers,  27%;  firm   industrial  customers,  5%;  interruptible
customers, 3%; and noncore, large volume customers, 30%.
 
    Cascade has experienced significant growth in its core customer base  during
the  last  five years  due primarily  to customer  conversion from  other energy
sources to gas space and water  heating and new residential construction in  its
service  territory. Cascade's residential customer  base increased by 8.3%, 8.3%
and 6.1% during 1993, 1994 and 1995, respectively. At March 31, 1996,  Cascade's
residential  customer  count was  6.2% higher  than at  March 31,  1995. Cascade
believes its  current  residential growth  rate  is  one of  the  highest  among
companies in the local gas distribution business in the United States.
 
    The  Company's executive offices  are located at  222 Fairview Avenue North,
Seattle, Washington 98109. Its telephone number is (206) 624-3900.
 
      CERTAIN ISSUES FACING THE COMPANY AND THE GAS DISTRIBUTION INDUSTRY
 
    Cascade is subject to  factors affecting both  the natural gas  distribution
industry  generally  and those  companies which,  like itself,  are experiencing
customer growth, including:  the need  for adequate  and timely  rate relief  to
recover increased capital and operating costs resulting from customer growth and
to  sustain dividend levels;  increasing competition brought  on by deregulation
initiatives at the federal  and state regulatory levels;  the potential loss  of
large  volume industrial customers  due to bypass (bypass  occurs when a natural
gas customer  connects directly  to an  interstate pipeline  and "bypasses"  the
local  gas  distribution company)  or  the shift  by  such customers  to special
competitive contracts  at  lower per  unit  margins; exposure  to  environmental
cleanup requirements; and general economic conditions.
 
                                USE OF PROCEEDS
 
    Except  as may otherwise be set forth  in any Prospectus Supplement, the net
proceeds, after deduction  of expenses, from  the sale of  the shares of  Common
Stock  offered  hereby will  be used  by  the Company  to repay  short-term debt
incurred in connection with the Company's capital construction program, to  fund
future capital construction under the program, and for other corporate purposes.
 
                          CAPITAL CONSTRUCTION PROGRAM
 
    The Company's capital expenditures in 1993, 1994, and 1995 were $32,990,000,
$27,251,000,  and $37,637,000, respectively. The 1996 capital expenditure budget
is $35,147,000 of  which $5,200,000 had  been expended through  March 31,  1996.
Approximately  59%  of  the  1996  budget will  be  expended  for  equipment and
facilities to  service  additional  customers,  with  the  remaining  41%  being
expended  to maintain customer service and upgrade equipment and facilities. The
percentage of capital  expenditures expended  in connection  with servicing  new
customers  has declined from 74% in 1995 and 82% in 1994 due to the commencement
in 1995  of a  construction program  to reinforce  the Company's  system on  the
Kitsap  Peninsula in the State of Washington,  which is expected to be completed
in 1997.
 
                                       3
<PAGE>
    Including the budgeted  1996 expenditures, Cascade  will have invested  over
$168,000,000  on new plant facilities in the five years ending in 1996, compared
to a total of  $133,252,000 in the  12-year period from  1980 through 1991.  The
Company presently anticipates that capital expenditures will total approximately
$150,000,000 during the five-year period ending in 2001.
 
                          DESCRIPTION OF COMMON STOCK
 
GENERAL
 
    The  number of  authorized shares of  Common Stock of  Cascade is 15,000,000
shares, with 9,249,611 shares issued and  outstanding as of June 30, 1996.  Also
at  that  date,  Cascade  had  outstanding  156,560  shares  of  preferred stock
("Preferred Stock"),  consisting  of 96,560  shares  of $.55  cumulative  senior
preferred  stock, without  par value  (the "$.55  Preferred Stock"),  and 60,000
shares of  7.85%  cumulative  preferred  stock,  $1.00  par  value  (the  "7.85%
Preferred  Stock"). An additional  940,000 shares of  preferred stock, $1.00 par
value, are authorized for  issuance pursuant to  Cascade's Restated Articles  of
Incorporation,  as amended  (the "Restated Articles"),  including 110,000 shares
reserved for  issuance as  Series Z  Junior Participating  Preferred Stock  (the
"Series Z Preferred Stock"). See "Preferred Stock Purchase Rights" below.
 
    The  following  statements  summarize  certain  provisions  of  the Restated
Articles. Such summary does not purport to  be complete and is qualified in  its
entirety by reference to the Restated Articles, which are filed as an exhibit to
the Registration Statement of which this Prospectus is a part.
 
DIVIDENDS
 
    After  the payment of all preferential  dividends on shares of the Preferred
Stock, holders  of  the Common  Stock  are entitled  to  dividends when  and  as
declared  by the Board of Directors.  The Company's bank loan agreements contain
provisions requiring maintenance of a minimum net worth. Under these provisions,
approximately $23,220,000 was available  for dividends on  the Common Stock  and
the Preferred Stock at March 31, 1996.
 
VOTING RIGHTS
 
    Except  as described below and except  as otherwise provided by law, holders
of the Common Stock have exclusive voting power and are entitled to one vote for
each share held of record. Approval  of matters brought before the  shareholders
requires  the affirmative  vote of  a plurality  of the  shares of  Common Stock
present and  voting, except  as otherwise  required by  law or  by the  Restated
Articles  in the  case of certain  business combinations. The  holders of Common
Stock are entitled to cumulate their votes in electing directors.
 
    If the  Company  fails to  pay  six full  quarterly  dividends on  the  $.55
Preferred  Stock, the holders of such stock will have the right to elect, voting
as a  class to  the exclusion  of  the holders  of Common  Stock and  the  7.85%
Preferred  Stock, three members of the Board  of Directors until all arrears and
dividends have been paid in full, whereupon all voting rights will revest in the
holders of Common Stock and, to the extent applicable, the holders of the  7.85%
Preferred  Stock. In  addition, the  Company, without  obtaining the affirmative
vote of the holders of at least two-thirds of the shares of $.55 Preferred Stock
then outstanding,  may not  increase the  authorized number  of shares  of  $.55
Preferred  Stock, authorize  or issue  any stock  having priority  or preference
over, or ranking on a parity with,  the $.55 Preferred Stock as to dividends  or
assets,  amend the Restated Articles so as to affect adversely any rights of the
$.55 Preferred Stock, or merge or consolidate with or into any other corporation
or dispose of all or substantially all  of its assets. The holders of the  7.85%
Preferred  Stock  have similar  voting rights  with respect  to the  election of
directors in the event of dividend arrearages; provided that, if the holders  of
the  $.55 Preferred  Stock then  have the  right to  elect three  directors, the
holders of the 7.85% Preferred Stock may exercise their voting rights as to  the
election  of directors only to the extent that the holders of the $.55 Preferred
Stock have elected  fewer than three  directors, such that  the total number  of
directors  elected by  the holders  of the  $.55 Preferred  Stock and  the 7.85%
Preferred Stock is not more than three. The holders of the 7.85% Preferred Stock
also have approval rights comparable to  those of the $.55 Preferred Stock  with
respect  to changes in the  rights or priority of  the 7.85% Preferred Stock and
certain other extraordinary corporate events.
 
                                       4
<PAGE>
LIQUIDATION RIGHTS
 
    In the event of any liquidation,  dissolution or winding up of Cascade,  the
holders  of the  Common Stock  are entitled  to receive  pro rata  all assets of
Cascade, if any, remaining after payment of all debt and payment to the  holders
of  any outstanding preferred  stock of the full  preferential amounts fixed for
such stock.
 
DIVIDEND REINVESTMENT PLAN
 
    The Company maintains an Automatic Dividend Reinvestment Plan (the  "Plan").
All  holders  of Common  Stock may  participate in  the Plan  and may  have cash
dividends on their shares of Common Stock automatically reinvested in additional
shares of Common Stock and  may invest in additional  shares of Common Stock  by
making  optional cash payments  without the payment  of brokerage commissions or
service charges. Participation in  the Plan is offered  only through a  separate
prospectus available from the Company.
 
    The  Company may  issue authorized  but unissued  shares or,  at its option,
direct an independent  agent, who acts  on behalf of  participants, to  purchase
shares  in the open market for the Plan. The Company has been issuing authorized
but unissued shares for such purpose. During the 12 months ended March 31, 1996,
approximately 181,089 shares of Common Stock were issued under the Plan.
 
CHANGES IN CONTROL AND BUSINESS COMBINATIONS
 
    The Restated Articles and Washington law contain certain provisions that may
have the effect of delaying or  discouraging a hostile takeover of the  Company.
Article XII of the Restated Articles provides that certain business combinations
involving  the Company  and any  person who is  or who  has announced  a plan to
become the beneficial owner of 10% or  more of the outstanding Common Stock  (an
"Interested  Shareholder"),  must be  approved by  the  affirmative vote  of the
holders of at least 80%  of the outstanding shares of  the capital stock of  the
Company which are not owned by the Interested Shareholder or its affiliates. The
80%  voting requirement  does not  apply in the  case of  a business combination
which provides for conversion of Common Stock into cash, securities or  property
with  a fair market value not less than  the highest per share price paid by the
Interested Shareholder or its affiliates for any of their shares of Common Stock
or, under certain circumstances, if the business combination is approved by  the
Board of Directors.
 
    In  addition,  Chapter 23B.19  of  the Washington  Business  Corporation Act
prohibits certain Washington corporations, including the Company, from  engaging
in  certain significant business transactions, such  as a merger, share exchange
or  consolidation,  sale,  exchange  or  mortgage  of  significant  assets,   or
termination of more than 5% of the employees of such a corporation, for a period
of  five  years  following  an  acquiring  person's  acquisition  of  beneficial
ownership of 10% or more of  the outstanding voting shares of such  corporation,
unless  the significant business  transaction or the purchase  of such shares is
approved in advance of the share acquisition by a majority of the members of the
board of directors of such corporation.
 
PREFERRED STOCK PURCHASE RIGHTS
 
    In May  1993, the  Company distributed  to holders  of Common  Stock  rights
("Rights")  to purchase shares of  Series Z Preferred Stock  on the basis of one
Right for each share of Common Stock. Each share of Common Stock offered  hereby
will,  upon  issuance,  be accompanied  by  one  Right. The  Rights  may  not be
exercised and will be attached  to and trade with  shares of Common Stock  until
the  Distribution Date,  which will occur  on the  earlier of (i)  the tenth day
following a public announcement that there has been a "Share Acquisition," i.e.,
that a person or group  (other than the Company  and certain other persons)  has
acquired  or obtained the right to acquire 20% or more of the outstanding Common
Stock and (ii) the tenth business day following the commencement or announcement
of certain  offers  to  acquire beneficial  ownership  of  30% or  more  of  the
outstanding  Common Stock. Subject  to restrictions on  exercisability while the
Rights are redeemable as discussed below, each Right entitles the holder to  buy
from  the Company one one-hundredth of a share  of Series Z Preferred Stock at a
price of $85, subject to adjustment. Upon the occurrence of a Share Acquisition,
and provided that all  necessary regulatory approvals  have been obtained,  each
Right  will thereafter  entitle the holder  (other than the  acquiring person or
group and transferees) to buy  from the Company for  $85 shares of Common  Stock
having a market value of $170, subject to adjustment.
 
    Until  a Right is exercised, the holder of a Right will not thereby have any
rights as a shareholder of the Company, including, without limitation, the right
to   vote   or   to   receive   dividends.   There   is   no   assurance    that
 
                                       5
<PAGE>
all  regulatory approvals for the exercise of  the Rights or the issuance of the
underlying securities  could  be  obtained  in  a  timely  fashion  or  at  all.
Furthermore,  prior  to  the Distribution  Date,  the Company  may,  without the
consent of holders  of the  Rights, amend the  Rights in  any manner,  including
amendments  which result in the cancellation of  the Rights. Until the tenth day
following a Share Acquisition, the Company may redeem all outstanding Rights  at
a  redemption price of $.01  per Right, subject to  adjustment. While the Rights
are so  subject  to  redemption,  they  are  not  exercisable.  Accordingly,  no
purchaser  of shares of Common Stock offered  hereby should buy such shares with
the expectation that the Rights  will be of material  benefit to the holders  of
Common Stock.
 
    The  Rights  have  certain  antitakeover  effects.  The  Rights  will  cause
substantial dilution to a person or  group that attempts to acquire the  Company
on  terms not sanctioned by the Board  of Directors, except pursuant to an offer
conditioned on a substantial number of Rights being acquired. The Rights  should
not  interfere with any  merger or other business  combination sanctioned by the
Board of Directors at a time when the Rights are redeemable.
 
    The foregoing  description of  the Rights  is subject  to and  qualified  by
reference  to the  Rights Agreement dated  as of  March 19, 1993,  and the First
Amendment to Rights  Agreement dated as  of June  15, 1993, which  are filed  as
exhibits  to the Registration  Statement of which  this Prospectus is  a part. A
more complete  description of  the Rights  is set  forth in  Exhibit 99  to  the
Company's  Current Report on Form 8-K dated July 18, 1996, which description has
been incorporated by reference herein.  See "Incorporation of Certain  Documents
by Reference."
 
TRANSFER AGENT AND REGISTRAR
 
    The  transfer agent and  registrar for the  Common Stock is  The Bank of New
York, New York, New York.
 
MISCELLANEOUS
 
    All shares  of  Common  Stock  presently  outstanding  are  fully  paid  and
nonassessable  and the shares of Common  Stock offered hereby, upon issuance and
payment therefor, will be fully paid and nonassessable. Holders of Common  Stock
have  no preemptive or similar rights  to subscribe for additional securities of
the Company.
 
                              PLAN OF DISTRIBUTION
 
    The Company may offer the Common Stock offered hereby in any of three  ways:
(i)  through  underwriters or  dealers;  (ii) directly  to  a limited  number of
purchasers or to  a single purchaser;  or (iii) through  agents. Any  Prospectus
Supplement  with respect to shares  of the Common Stock  offered hereby will set
forth the terms of the  offering and the proceeds to  the Company from the  sale
thereof,  any underwriting discounts and  other items constituting underwriters'
compensation,  any  initial  public  offering   price,  and  any  discounts   or
concessions allowed or reallowed or paid to dealers. Any initial public offering
price  and any discounts or concessions allowed  or reallowed or paid to dealers
may be changed from time to time.
 
    If underwriters are utilized,  the Common Stock being  sold to them will  be
acquired  by the underwriters for their own  account and may be resold from time
to time in  one or more  transactions, including negotiated  transactions, at  a
fixed public offering price or at varying prices determined at the time of sale.
The  underwriter or underwriters with respect  to the Common Stock being offered
will be named in the Prospectus Supplement relating to such offering and, if  an
underwriting syndicate is used, the managing underwriter or underwriters will be
set  forth on  the cover  page of  such Prospectus  Supplement. Any underwriting
agreement will provide that the obligations  of the underwriters are subject  to
certain  conditions precedent,  and that, in  general, the  underwriters will be
obligated to  purchase  all  of  the  shares  of  Common  Stock  to  which  such
underwriting  agreement relates if  any is purchased. The  Company will agree to
indemnify  any  underwriters  against   certain  civil  liabilities,   including
liabilities under the Securities Act of 1933, as amended.
 
    The  Common Stock  offered hereby  may be  sold directly  by the  Company or
through agents designated by the Company  from time to time. Any agent  involved
in    the   offer    or   sale   of    the   Common   Stock    in   respect   of
 
                                       6
<PAGE>
which this Prospectus is delivered will be named, and any commissions payable by
the Company  to such  agent will  be set  forth, in  the Prospectus  Supplement.
Unless  otherwise indicated in the Prospectus Supplement, any such agent will be
acting on a best efforts basis for the period of its appointment.
 
                                 LEGAL MATTERS
 
    The legality  of  the securities  offered  hereby and  certain  other  legal
matters  will be passed  upon for the  Company by Miller,  Nash, Wiener, Hager &
Carlsen LLP, Seattle, Washington, and certain legal matters will be passed  upon
for  any underwriters, dealers or agents by Winthrop, Stimson, Putnam & Roberts,
New York, New York.
 
                                    EXPERTS
 
    The consolidated  financial statements  incorporated in  this Prospectus  by
reference  from the  Company's annual  report on  Form 10-K  for the  year ended
December 31,  1995, have  been audited  by Deloitte  & Touche  LLP,  independent
auditors,  as stated in their report  which is incorporated herein by reference,
and have been so  incorporated in reliance  upon the report  of such firm  given
upon their authority as experts in accounting and auditing.
 
                                       7
<PAGE>
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    NO  DEALER, SALESPERSON OR ANY OTHER PERSON  HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR  TO  MAKE  ANY  REPRESENTATIONS OTHER  THAN  THOSE  CONTAINED  OR
INCORPORATED  IN THIS PROSPECTUS SUPPLEMENT OR THE PROSPECTUS IN CONNECTION WITH
THE OFFER MADE BY THIS PROSPECTUS SUPPLEMENT OR THE PROSPECTUS AND, IF GIVEN  OR
MADE, SUCH INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN
AUTHORIZED  BY THE COMPANY OR BY THE  UNDERWRITERS. NEITHER THE DELIVERY OF THIS
PROSPECTUS SUPPLEMENT AND THE PROSPECTUS  NOR ANY SALE HEREUNDER AND  THEREUNDER
SHALL,  UNDER ANY  CIRCUMSTANCES, CREATE AN  IMPLICATION THAT THERE  HAS BEEN NO
CHANGE IN THE  AFFAIRS OF  THE COMPANY SINCE  THE DATE  HEREOF. THIS  PROSPECTUS
SUPPLEMENT  AND THE  PROSPECTUS DO  NOT CONSTITUTE  AN OFFER  OR SOLICITATION BY
ANYONE IN ANY JURISDICTION IN WHICH SUCH OFFER OR SOLICITATION IS NOT AUTHORIZED
OR IN WHICH THE PERSON MAKING SUCH OFFER OR SOLICITATION IS NOT QUALIFIED TO  DO
SO OR TO ANYONE TO WHOM IT IS UNLAWFUL TO MAKE SUCH OFFER OR SOLICITATION.
 
                              -------------------
 
                               TABLE OF CONTENTS
 
                             PROSPECTUS SUPPLEMENT
 
<TABLE>
<CAPTION>
                                                   PAGE
                                                 ---------
<S>                                              <C>
Cascade Natural Gas Corporation Service Area...        S-2
Summary Information............................        S-3
Summary Financial and Operating Data...........        S-4
The Company....................................        S-5
Recent Developments............................        S-5
Seasonality....................................        S-6
Common Stock Price Range and Dividends.........        S-7
Forward-Looking Statements.....................        S-7
Underwriting...................................        S-8
 
                        PROSPECTUS
Available Information..........................          2
Incorporation of Certain Documents by
  Reference....................................          2
The Company....................................          3
Certain Issues Facing the Company and the Gas
  Distribution Industry........................          3
Use of Proceeds................................          3
Capital Construction Program...................          3
Description of Common Stock....................          4
Plan of Distribution...........................          6
Legal Matters..................................          7
Experts........................................          7
</TABLE>
 
                                1,350,000 SHARES
 
                        CASCADE NATURAL GAS CORPORATION
 
                                  COMMON STOCK
 
                             ---------------------
 
                             PROSPECTUS SUPPLEMENT
 
                             ---------------------
 
                              MERRILL LYNCH & CO.
 
                           A.G. EDWARDS & SONS, INC.
 
                          RAGEN MACKENZIE INCORPORATED
 
                                AUGUST 13, 1996
 
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