BLACKROCK CALIFORNIA INSURED MUNICIPAL 2008 TERM TRUST INC
N-30D, 1998-08-28
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- --------------------------------------------------------------------------------
         THE BLACKROCK CALIFORNIA INSURED MUNICIPAL 2008 TERM TRUST INC.
                       SEMI-ANNUAL REPORT TO SHAREHOLDERS
                          REPORT OF INVESTMENT ADVISER
- --------------------------------------------------------------------------------

                                                                   July 31, 1998

Dear Shareholder:

      Domestic  bonds  provided  investors  with modest total returns during the
past six months,  as interest rates generally  fell.  Supporting the bond market
was favorable inflation news and the belief that the Federal Reserve is unlikely
to raise short-term interest rates in the immediate future.

      U.S.  economic  growth has slowed of late after a robust first  quarter of
1998.  We  expect  the  fallout  from the  Asian  fiscal  crisis  to  quash  any
significant  rebound in U.S.  growth  for the  remainder  of the year.  While we
expect  that  interest  rates  will  be  fairly  stable  in the  near-term,  our
longer-term  outlook  for the  bond  market  remains  optimistic,  based  on the
fundamentally  favorable  backdrop of low  inflation,  a currently high level of
real yields, and declining Treasury borrowing.

      As you may know, the five investment  management  firms that comprised the
PNC Asset  Management  Group have  consolidated  under  BlackRock,  resulting in
BlackRock Inc., a $119 billion money  management  firm. We look forward to using
our  global  investment  management  expertise  to present  exciting  investment
opportunities to closed-end fund shareholders in the future.

      This report  contains  comments from your Trust's  managers  regarding the
markets and  portfolio  in addition to the Trust's  financial  statements  and a
detailed  portfolio listing.  We thank you for your continued  investment in the
Trust.

Sincerely,
/s/ Laurence D. Fink                                   /s/ Ralph L. Schlosstein
- --------------------                                   ------------------------
Laurence D. Fink                                       Ralph L. Schlosstein
Chairman                                               President



                                       1
<PAGE>



                                                                   July 31, 1998
Dear Shareholder:

      We are  pleased  to  present  the  semi-annual  report  for The  BlackRock
California  Insured  Municipal  2008 Term Trust Inc.  ("the  Trust") for the six
months ended June 30, 1998. We would like to take this opportunity to review the
Trust's   stock  price  and  net  asset  value  (NAV)   performance,   summarize
developments in the fixed income markets and discuss recent portfolio management
activity.

      The  Trust is a  non-diversified  closed-end  bond fund  whose  investment
objective is to manage a portfolio of municipal debt securities that will return
$15 per share (an amount equal to the Trust's  initial public offering price) to
investors on or about  December 31, 2008,  while  providing  high current income
exempt from  regular  federal  and  California  income  tax.  The Trust seeks to
achieve this  objective by investing in high credit quality ("AAA" or insured to
"AAA")  California  tax-exempt  general  obligation  and revenue bonds issued by
city, county and state municipalities.

      The table below  summarizes the changes in the Trust's stock price and net
asset value over the period:

                            ----------------------------------------------------
                            6/30/98    12/31/97   CHANGE     HIGH        LOW
- --------------------------------------------------------------------------------
STOCK PRICE                 $15.5625   $15.2500    2.05%   $15.7500    $15.0000
- --------------------------------------------------------------------------------
NET ASSET VALUE (NAV)       $16.77     $16.69      0.48%   $16.96      $16.54
- --------------------------------------------------------------------------------

THE FIXED INCOME MARKETS

     After an  extremely  strong first  quarter of 1998,  U.S.  economic  growth
slowed during the past three months.  Despite the strong  economic growth of the
past year,  inflation  stayed  surprisingly  subdued.  One  explanation  for the
absence of inflation in the U.S.  economy  stems from the aftermath of the Asian
financial  crisis.  U.S. exports to Asia have slowed,  while the strength of the
dollar  caused cheap Asian imports to flood the U.S.  market and exert  downward
price pressure on domestic goods.

      Yields of U.S. Treasury  securities have remained in a fairly narrow range
during the period.  For example,  the yield of the 10-Year Treasury posted a net
decline of 29 basis points (0.29%),  beginning 1998 at 5.74% and closing on June
30, 1998 at 5.45%.  The past six months  represented  a  continuation  of strong
Treasury  performance,  which has been due to moderating  economic  growth,  low
inflation and a "flight to quality" from investors  seeking a safe haven in U.S.
Treasury  securities.  Continued  expectations  that the Asian  crisis will slow
economic  growth and force the Fed to leave the  Federal  funds  rate  unchanged
provided  additional support to the bond market. With Treasury supply waning due
to a  surplus  in  the  federal  budget  and an  increased  foreign  demand  for
Treasuries  due to their  U.S.  government  backing  and  relatively  attractive
yields,  we anticipate a positive  environment for Treasuries for the balance of
1998.

      California's  economy has  recovered.  Today's growth  industries  include
entertainment, high technology, biotechnology and small start-up businesses that
have recently  contributed to the state's fiscal  viability.  Additionally,  the
construction  industry  is  booming,  as  building  is  occurring  in  both  the
commercial  and  residential  sectors.  A growing  population  has  resulted  in
significantly increased revenues,  stabilizing the State's financial position to
such a degree  that  California



                                       2
<PAGE>


maintains a balanced budget.  The State's job growth continues to exceed that of
the U.S.  These  positive  trends may result in an upgrade of the State's credit
rating to the AA category. The Asian economic turmoil's impact on the California
economy is currently being offset by increased trade with Mexico.

      Municipal bonds underperformed the taxable domestic bond market during the
past six months,  returning 2.69% (as measured by the LEHMAN BROTHERS  MUNICIPAL
INDEX) versus the LEHMAN  BROTHERS  AGGREGATE  INDEX'S 3.91% on a pre-tax basis.
The main forces behind municipal bond  underperformance were increased municipal
bond supply (fueled by the lowest municipal  interest rates since the 1960s) and
retail  investor  focus on the equity  markets.  We believe that  municipals are
attractively  valued versus Treasuries and our outlook for municipal  securities
is favorable.  The credit quality of most issuers remains strong,  and we expect
that the attractive  taxable  equivalent yields offered by municipal  securities
should bring investors back into the market.

THE TRUST'S PORTFOLIO AND INVESTMENT STRATEGY

      The Trust's portfolio is actively managed to diversify exposure to various
sectors,  issuers,  revenue sources and security types.  BlackRock's  investment
strategy  emphasizes  a  relative  value  approach,  which  allows  the Trust to
capitalize  upon  changing  market  conditions  by rotating  municipal  sectors,
credits  and  coupons.  Additionally,  the  Trust  emphasizes  securities  whose
maturity  dates match the  termination  date of the Trust.  We have continued to
minimize trading  activity in the Trust during the period,  as the market prices
of a significant portion of the portfolio's bonds are currently above the prices
at which  they  were  bought.  A bond sold at a gain  would  result in the Trust
realizing  a  capital  gain,  which  may  require  a  taxable   distribution  to
shareholders.  Since one of the Trust's primary investment  objectives is to pay
out tax-exempt income, we believe that waiting to restructure the portfolio in a
higher interest rate environment remains the most prudent strategy.

      The  following  chart  compares the Trust's  current and December 31, 1997
asset composition:

- --------------------------------------------------------------------------------
         THE BLACKROCK CALIFORNIA INSURED MUNICIPAL 2008 TERM TRUST INC.
- --------------------------------------------------------------------------------
      SECTOR                           JUNE 30,1998      DECEMBER 31, 1997
- --------------------------------------------------------------------------------
      Lease Revenue                         26%                 19%
- --------------------------------------------------------------------------------
      Transportation                        21%                 20%
- --------------------------------------------------------------------------------
      Water & Sewer                         20%                 19%
- --------------------------------------------------------------------------------
      County, City & State                  11%                 11%
- --------------------------------------------------------------------------------
      Utility/Power                          9%                  9%
- --------------------------------------------------------------------------------
      Hospital                               5%                  6%
- --------------------------------------------------------------------------------
      Special District                       3%                  3%
- --------------------------------------------------------------------------------
      Tax Revenue                            2%                  2%
- --------------------------------------------------------------------------------
      Education                              2%                  2%
- --------------------------------------------------------------------------------
      Other                                  1%                  2%
- --------------------------------------------------------------------------------
      Certificates of Participation         --                   7%
- --------------------------------------------------------------------------------


                                       3
<PAGE>



      Additionally,  the Trust employs  leverage to enhance its income by paying
the Trust's preferred shareholders  short-term municipal rates and investing the
proceeds in longer maturity issues which have higher yields. The Trust's ability
to pay high monthly income may be affected by the profitability of its leverage.
The  Federal  Reserve's  neutral  interest  rate  policy has allowed the Trust's
leverage costs to remain  reasonable.  At the present,  we believe that leverage
will continue to positively  contribute to the Trust's  long-term income earning
ability.

      We look forward to managing  the Trust to benefit  from the  opportunities
available in the fixed income markets and to meet its investment objectives.  We
thank you for your investment in the BlackRock California Insured Municipal 2008
Term  Trust  Inc.  Please  feel free to contact  our  marketing  center at (800)
227-7BFM (7236) if you have specific  questions which were not addressed in this
report.

Sincerely,

/s/ Robert S. Kapito                    /s/ Kevin Klingert
- --------------------                    ------------------
Robert S. Kapito                        Kevin Klingert
Vice Chairman and Portfolio Manager     Managing Director and Portfolio Manager
BlackRock Financial Management, Inc.    BlackRock Financial Management, Inc.

- --------------------------------------------------------------------------------
         THE BLACKROCK CALIFORNIA INSURED MUNICIPAL 2008 TERM TRUST INC.
- --------------------------------------------------------------------------------
   Symbol on New York Stock Exchange:                                  BFC
- --------------------------------------------------------------------------------
   Initial Offering Date:                                    September 18, 1992
- --------------------------------------------------------------------------------
   Closing Stock Price as of 6/30/98:                              $15.5625
- --------------------------------------------------------------------------------
   Net Asset Value as of 6/30/98:                                  $16.77
- --------------------------------------------------------------------------------
   Yield on Closing Stock Price as of 6/30/98 ($15.5625)1:           4.96%
- --------------------------------------------------------------------------------
   Current Monthly Distribution per Common Share2:                  $0.064375
- --------------------------------------------------------------------------------
   Current Annualized Distribution per Common Share2:               $0.7725
- --------------------------------------------------------------------------------

- ----------
1 Yield on Closing Stock Price is calculated by dividing the current  annualized
  distribution per share by the closing stock price per share.

2 Distribution is not constant and is subject to change.



                                       4
<PAGE>


- --------------------------------------------------------------------------------
THE BLACKROCK CALIFORNIA INSURED MUNICIPAL 2008 TERM TRUST INC.
PORTFOLIO OF INVESTMENTS JUNE 30, 1998 (UNAUDITED)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------------
          PRINCIPAL                                                                                       OPTION
           AMOUNT                                                                                          CALL           VALUE
RATING*    (000)                                       DESCRIPTION                                     PROVISIONS++      (NOTE 1)
- -----------------------------------------------------------------------------------------------------------------------------------
 <S>       <C>        <C>                                                                             <C>              <C>
                      LONG-TERM INVESTMENTS--142.6%
                      California Hlth. Fac. Fin. Auth. Rev.,
  AAA      $ 6,850      Marin Gen. Hosp., Ser. A, 5.75%, 8/01/09, FSA .............................    08/03 at 102    $  7,302,511
  AAA        2,000      Sutter Hlth. Care Sys., 5.70%, 8/15/09, MBIA ..............................    08/06 at 102       2,165,220
                      California St., G.O.,
  AAA        2,000      6.25%, 9/01/08, FGIC ......................................................    No Opt. Call       2,297,700
  AAA       15,000      6.30%, 9/01/08, MBIA ......................................................    No Opt. Call      17,293,650
  AAA        3,000      5.50%, 4/01/09, MBIA ......................................................    No Opt. Call       3,262,560
                      California St. Pub. Wks. Brd.,
  AAA        2,100    Energy Efficiency, Ser. A, 5.625%, 10/01/08, AMBAC ..........................    10/05 at 102       2,278,983
  AAA       10,255    Lease Rev., 6.40%, 9/01/01+, MBIA ...........................................        N/A           11,173,540
  AAA        9,165    California St. Wide Cmnty. Dev. Auth., Lease Rev., 6.00%, 10/01/10, AMBAC ...    10/02 at 102       9,884,819
  AAA        2,600    Castaic Lake Wtr. Agcy. C.O.P., Wtr. Sys. Impvt. Proj., Ser A,
                        7.25%, 8/01/10, MBIA ......................................................    No Opt. Call       3,234,816
  AAA        5,515    Central Coast Wtr. Auth. Rev., St. Wtr. Proj. Reg. Fac.,
                        6.40%, 10/01/02+, AMBAC ...................................................        N/A            6,114,315
  AAA        5,500    Clovis Unified Sch. Dist., Ser. B, Zero Coupon, 8/01/08, FGIC ...............    No Opt. Call       3,472,315
  AAA       13,740    East Bay Mun. Utils. Dist., Wtr. Sys. Rev., 6.00%, 6/01/09, AMBAC ...........    06/02 at 102      14,803,064
  AAA        4,025    Elsinore Valley Mun. Wtr. Dist., C.O.P., Ser. A, 6.00%, 7/01/09, FGIC .......    No Opt. Call       4,520,155
                      Los Angeles Cnty. Asset Leasing Corp. Rev., AMBAC,
  AAA        2,910      5.95%, 12/01/07 ...........................................................    No Opt. Call       3,250,470
  AAA        8,090      6.00%, 12/01/08 ...........................................................    No Opt. Call       9,114,598
  AAA        8,600      6.05%, 12/01/09 ...........................................................    No Opt. Call       9,767,622
  AAA        1,000    Los Angeles Elec. Rev., 5.75%, 9/01/12, FGIC ................................    09/03 at 102       1,062,920
  AAA        5,765    Los Angeles Wastewtr. Sys. Rev., Ser. B, 6.25%, 6/01/02+, AMBAC .............        N/A            6,323,513
  AAA        3,075    Marysville Hosp. Rev., Fremont-Rideout Hlth. Group, Ser. A,
                        6.20%, 1/01/03+, AMBAC ....................................................        N/A            3,388,404
  AAA        8,000    Modesto Irrig. Dist. Fin. Rev., Domestic Wtr. Proj., Se(pi)r. A,
                        6.00%, 9/01/02+, AMBAC ....................................................        N/A            8,735,360
                      Northern California Pwr. Agcy., Multiple Cap. Fac. Rev., Ser. A, MBIA,
  AAA        1,000      6.40%, 8/01/07 ............................................................    08/02 at 102       1,095,130
  AAA        3,045      6.50%, 8/01/08 ............................................................    08/02 at 102       3,333,940
  AAA        1,000    Orange Cnty. Local Trans. Auth. Sales Tax Rev., 6.00%, 2/15/09, MBIA ........    No Opt. Call       1,119,640
  AAA        5,600    Pittsburg Redev. Agcy. Tax Alloc. Rev., Los Medanos Cmnty. Dev. Proj.,
                        5.50%, 8/01/07, FGIC ......................................................    08/02 at 102       5,913,824
  AAA        3,075    Riverside Cnty. Trans. Comm. Sales Tax Rev., Ser. A, 6.50%, 6/01/01+, MBIA ..        N/A            3,342,802
                      Sacramento Mun. Utils. Dist., Elec. Rev., Ser. C,
  AAA        2,500      5.75%, 11/15/07, MBIA .....................................................    11/02 at 102       2,670,600
  AAA        6,250      5.75%, 11/15/08, FGIC .....................................................    11/02 at 102       6,805,513
  AAA        4,700      5.75%, 11/15/09, MBIA .....................................................    11/02 at 102       5,020,728
  AAA        5,700    San Bernardino Cnty. C.O.P., Arpt. Impvt., 6.00%, 7/01/07, MBIA .............    07/02 at 102       6,125,904
  AAA        5,000    San Bernardino Cnty. Trans. Auth., Sales Tax Rev., 6.00%, 3/01/10, FGIC .....    No Opt. Call       5,360,950
                      San Diego Cnty. Regl. Trans. Cmnty. Sales Tax Rev., Ser. A,
  AAA        7,830      6.00%, 4/01/08, MBIA ......................................................    04/01 at 102       8,711,110
  AAA        2,500      6.00%, 4/01/08, FGIC ......................................................   No. Opt. Call       2,781,325
  AAA        7,650    San Diego Redev. Agcy. Rev., Tax Allocation-Centre City Proj.,
                        6.00%, 9/01/08, AMBAC .....................................................    09/02 at 102       8,242,722
                      San Jose Arpt. Rev., MBIA,
  AAA        3,755      6.10%, 3/01/07 ............................................................    03/03 at 102       4,093,926
  AAA        8,010      6.00%, 3/01/09 ............................................................    03/03 at 102       8,664,177
  AAA        3,000      6.00%, 3/01/10 ............................................................    03/03 at 102       3,245,010
</TABLE>

                       See Notes to Financial Statements.

                                       5
<PAGE>


<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------------
          PRINCIPAL                                                                                       OPTION
           AMOUNT                                                                                          CALL           VALUE
RATING*    (000)                                       DESCRIPTION                                     PROVISIONS++      (NOTE 1)
- -----------------------------------------------------------------------------------------------------------------------------------
 <S>       <C>        <C>                                                                              <C>             <C>
  AAA      $ 2,865    Santa Clara Cnty. Fin. Auth., Fac. Replacement, Proj. A,
                        6.50%, 11/15/04+, AMBAC ...................................................         N/A        $  3,281,829
  AAA        2,820    Santa Rosa Wtr. Rev., Ser. B, 6.20%, 9/01/09, FGIC ..........................   09/02 at 101.5      3,047,912
  AAA        5,000    So. California Rapid Trans. Dist. C.O.P., Workers Comp. Fund,
                        6.00%, 7/01/10, MBIA ......................................................   01/01 at 102.5      5,310,800
                      So. California Rapid Trans. Dist. Rev., Spec. Benefit Assmt. Dist. A1, AMBAC,
  AAA        5,500      6.00%, 9/01/08 ............................................................     09/02 at 102      5,926,140
  AAA        5,750      5.50%, 9/01/09 ............................................................     09/02 at 100      5,969,075
  AAA        8,500    Sonoma Cnty. C.O.P., Capital Rites-Detention Fac., 6.00%, 11/15/10, AMBAC ...     11/02 at 102      9,181,105
  AAA        2,000    Univ. of California Rev., Multi-Purpose Projs., Ser. B-1989,
                        6.80%, 9/01/99+, AMBAC ....................................................         N/A           2,108,720
  AAA        2,000    Univ. of California Rev., Multi-Purpose Projs., Ser. F-1989,
                        5.00%, 9/01/11, FGIC ......................................................     09/06 at 101      2,045,380
                      West & Central Basin Fin. Auth. Rev., AMBAC,
  AAA        1,665      6.125%, 8/01/02+ ..........................................................         N/A           1,823,625
  AAA          870      6.125%, 8/01/08 ...........................................................     08/02 at 102        952,885
  AAA          925      6.125%, 8/01/09 ...........................................................     08/02 at 102      1,013,125
  AAA        2,160    West Sacramento Fin. Auth. Rev., Wtr. Sys. Impvt., 5.25%, 8/01/08, FGIC .....     08/02 at 102      2,248,236
                                                                                                                       ------------
                      TOTAL LONG-TERM INVESTMENTS (COST $224,562,310) .............................                     248,882,668
                                                                                                                       ------------
                      SHORT-TERM INVESTMENTS**--1.3%
 A-1+        1,160    California Hlth. Fac. Fin. Auth. Rev., Ser. A, 3.25%, 7/01/98, FRDD .........        N/A            1,160,000
                      California P.C.R. Fin. Auth. FRDD,
 A-1+          400      Proj. B, 3.25%, 7/01/98 ...................................................        N/A              400,000
 A-1+          400      Proj. C, 3.25%, 7/01/98 ...................................................        N/A              400,000
 A-1+          400    Irvine Impvt. BD Act 1915, Dist 95-12-Ser. A, 3.30%, 7/01/98, FRDD ..........        N/A              400,000
                                                                                                                       ------------
                      TOTAL SHORT-TERM INVESTMENTS (COST $2,360,000) ..............................                       2,360,000
                                                                                                                       ------------
                      TOTAL INVESTMENTS--143.9% (COST $226,922,310) ...............................                     251,242,668
                      Other asset in excess of liabilities--0.8% ..................................                       1,308,640
                      Liquidation value of preferred stock--(44.7%) ...............................                     (78,000,000)
                                                                                                                       ------------
                      NET ASSETS APPLICABLE TO COMMON SHAREHOLDERS--100% ..........................                    $174,551,308
                                                                                                                       ============
</TABLE>

- ----------
 * Rating: Using the higher of Standard & Poor's, Moody's or Fitch's rating.

** For  purposes  of  amortized  cost  valuation,  the  maturity  date of  these
   instruments  is  considered  to be the  later of the next  date or which  the
   security  can be  redeemed  at par or the  next  date on  thich  the  rate of
   interest is adjusted.

 + This bond is prerefunded. See glossary for definition.

++ Option call provisions:  date (month/year) and price of the earliest optional
   call or redemption.  There may be other call  provisions at varying prices at
   later dates.

- --------------------------------------------------------------------------------
         THE FOLLOWING ABBREVIATIONS ARE USED IN PORTFOLIO DESCRIPTIONS:

<TABLE>
   <S>    <C>                                                <C>    <C>
   AMBAC  -- American Municipal Bond Assurance Corporation   FSA    -- Financial Security Assurance
   C.O.P. -- Certificate of Participation                    G.O.   -- General Obligation Bond
   FGIC   -- Financial Guaranty Insurance Company            MBIA   -- Municipal Bond Insurance Association
   FRDD   -- Floating Rate Daily Demand                      P.C.R. -- Pollution ControlRevenue
</TABLE>
- --------------------------------------------------------------------------------

                       See Notes to Financial Statements.


                                       6
<PAGE>

- --------------------------------------------------------------------------------
THE BLACKROCK CALIFORNIA INSURED
MUNICIPAL 2008 TERM TRUST INC.
STATEMENT OF ASSETS AND LIABILITIES
JUNE 30, 1998 (UNAUDITED)
- --------------------------------------------------------------------------------

ASSETS

Investments, at value (cost $226,922,310)
  (Note 1) .................................   $251,242,668
Interest receivable ........................      3,707,234
Receivable for investments sold ............         40,000
Other assets ...............................         12,790
                                               ------------
                                                255,002,692
                                               ------------
                                            
LIABILITIES                                 
Payable for investments purchased ..........      2,038,089
Dividends payable-preferred stock ..........        120,015
Investment advisory fee payable (Note 2) ...         72,774
Due to custodian ...........................         51,857
Administration fee payable (Note 2) ........         20,793
Other accrued expenses .....................        147,856
                                               ------------
                                                  2,451,384
                                               ------------
NET INVESTMENT ASSETS                          $252,551,308
                                               ============
Net investment assets were comprised of:    
  Common Stock:                             
    Par value (Note 4) .....................   $    104,071
    Paid-in capital in excess of par .......    144,619,829
  Preferred Stock (Note 4) .................     78,000,000
                                               ------------
                                                222,723,900
Undistributed net investment income ........      5,504,551
Accumulated net realized gain ..............          2,499
Net unrealized appreciation ................     24,320,358
                                               ------------
Net investment assets, June 30, 1998 .......   $252,551,308
                                               ============
Net assets applicable to common             
  shareholders .............................   $174,551,308
                                               ============
Net asset value per common share:           
  ($174,551,308 / 10,407,093 shares of      
  common stock issued and outstanding) .....         $16.77
                                                     ======

- --------------------------------------------------------------------------------
THE BLACKROCK CALIFORNIA INSURED
MUNICIPAL 2008 TERMTRUST INC.
STATEMENT OF OPERATIONS
SIX MONTHS ENDED JUNE 30, 1998 (UNAUDITED)
- --------------------------------------------------------------------------------

NET INVESTMENT INCOME
Income
  Interest and discount earned .............     $6,904,529
                                                 ----------
Expenses
  Investment advisory ......................        439,702
  Administration ...........................        125,629
  Auction agent ............................        117,000
  Custodian ................................         40,000
  Reports to shareholders ..................         23,000
  Directors ................................         19,000
  Audit ....................................         16,000
  Transfer agent ...........................          9,000
  Legal ....................................          6,000
  Miscellaneous ............................         18,452
                                                 ----------
  Total expenses ...........................        813,783
                                                 ----------
Net investment income ......................      6,090,746
                                                 ----------
UNREALIZED GAIN ON
  INVESTMENTS (NOTE 3)
  Net change in unrealized appreciation on
    investments ............................          4,965
                                                 ----------
NET INCREASE IN NET INVESTMENT
 ASSETS RESULTING FROM OPERATIONS ..........     $6,095,711
                                                 ==========

                       See Notes to Financial Statements.

                                       7
<PAGE>

- --------------------------------------------------------------------------------
THE BLACKROCK CALIFORNIA INSURED MUNICIPAL 2008 TERM TRUST INC.
STATEMENTS OF CHANGES INNET INVESTMENT ASSETS (UNAUDITED)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                            SIX MONTHS        YEAR
                                                                               ENDED          ENDED
                                                                             JUNE 30,      DECEMBER 31,
                                                                               1998           1997
                                                                            ----------     ------------
<S>                                                                        <C>             <C>
INCREASE IN NET INVESTMENT ASSETS
OPERATIONS:
  Net investment income ................................................   $  6,090,746    $ 11,943,375
  Net change in unrealized appreciation on investments .................          4,965       7,258,145
                                                                           ------------    ------------
    Net increase in net investment assets resulting from operations ....      6,095,711      19,201,520
                                                                           ------------    ------------
DIVIDENDS AND DISTRIBUTIONS:
  To common shareholders from net investment income ....................     (4,019,669)     (8,039,350)
  To preferred shareholders from net investment income .................     (1,235,344)     (2,490,040)
                                                                                           ------------
    Total dividends and distributions ..................................     (5,255,013)    (10,529,390)
                                                                                           ------------
        Total increase .................................................        840,698       8,672,130

NET INVESTMENT ASSETS
Beginning of period ....................................................    251,710,610     243,038,480
                                                                           ------------    ------------
End of period ..........................................................   $252,551,308    $251,710,610
                                                                           ============    ============
</TABLE>



                       See Notes to Financial Statements.


                                       8
<PAGE>


- --------------------------------------------------------------------------------
THE BLACKROCKCALIFORNIA INSURED MUNICIPAL 2008 TERMTRUST INC.
FINANCIAL HIGHLIGHTS (UNAUDITED)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                        SIX MONTHS
                                                          ENDED                            YEAR ENDED DECEMBER 31,
                                                         JUNE 30,       -----------------------------------------------------------
                                                           1998           1997        1996          1995        1994         1993
                                                         --------        ------      ------        ------      ------       ------
<S>                                                      <C>            <C>         <C>           <C>         <C>          <C>
PER COMMON SHARE OPERATING
   PERFORMANCE:
Net asset value, beginning of the period .............   $  16.69       $  15.86     $  15.92     $  13.66    $  16.09     $  14.18
                                                         --------       --------     --------     --------    --------     --------
  Net investment income                                      0.59           1.15         1.11         1.12        1.12         1.14
  Net realized and unrealized gain (loss) on 
    investments ......................................       --             0.69        (0.16)        2.27       (2.48)        1.81
                                                         --------       --------     --------     --------    --------     --------
Net increase (decrease) from investment operations ...       0.59           1.84         0.95         3.39       (1.36)        2.95
                                                         --------       --------     --------     --------    --------     --------
Dividends from net investment income to:                                                                     
  Common shareholders ................................      (0.39)         (0.77)       (0.77)       (0.85)      (0.86)       (0.85)
  Preferred shareholders .............................      (0.12)         (0.24)       (0.24)       (0.28)      (0.21)       (0.18)
Distributions from net realized gain on 
  investments to:                                                      
  Common shareholders ................................       --            --            **           --          --          (0.01)
  Preferred shareholders .............................       --            --            **           --          --           **
Distributions in excess of net realized gain on                                                              
  investments to:                                                                                            
  Common shareholders ................................       --            --            **           **          --           --
  Preferred shareholders .............................       --            --            **           **          --           --
                                                         --------       --------     --------     --------    --------     --------
Total dividends and distributions                           (0.51)         (1.01)       (1.01)       (1.13)      (1.07)       (1.04)
                                                         --------       --------     --------     --------    --------     --------
Capital charge with respect to issuance of shares ....       --            --          --             --         ***           --
                                                         --------       --------     --------     --------    --------     --------
Net asset value, end of period* ......................   $  16.77       $  16.69     $  15.86     $  15.92    $  13.66     $  16.09
                                                         ========       ========     ========     ========    ========     ========
Market value, end of period* .........................   $  15.56       $  15.25     $  14.63     $  13.63    $  12.00     $  15.13
                                                         ========       ========     ========     ========    ========     ========
TOTAL INVESTMENT RETURN+ .............................       4.61%          9.90%       13.67%       20.57%     (15.59%)      14.79%
                                                         ========       ========     ========     ========    ========     ========
RATIOS TO AVERAGE NET ASSETS OF                                                                              
  COMMON SHAREHOLDERS:++                                                                                     
Expenses .............................................       0.94%+++       0.98%        1.03%        1.02%       1.08%        0.96%
Net investment income before preferred stock dividends       7.05%+++       7.11%        7.11%        7.46%       7.70%        7.33%
Preferred stock dividends ............................       1.43%+++       1.48%        1.56%        1.85%       1.46%        1.15%
Net investment income available to common shareholders       5.62%+++       5.63%        5.55%        5.61%       6.24%        6.18%
SUPPLEMENTAL DATA:                                                                                           
Average net assets of common shareholders 
  (in thousands) .....................................   $174,312       $167,984     $161,839     $156,774    $151,669     $160,350
Portfolio turnover ...................................          0%             0%           3%          13%         17%           8%
Net assets of common shareholders, end of period
  (in thousands) .....................................   $174,551       $173,711     $165,038     $165,719    $142,165     $167,439
Preferred stock outstanding (in thousands) ...........   $ 78,000       $ 78,000     $ 78,000     $ 78,000    $ 78,000     $ 78,000
Asset coverage per share of preferred stock,                                                                 
  end of period# .....................................   $ 80,946       $ 80,677     $ 77,897     $ 78,115    $141,131     $157,333
</TABLE>

- ----------

  * Net asset value and market value are  published  in THE WALL STREET  JOURNAL
    each Monday.

 ** Actual  amount  paid from net  realized  gain on  investments  to  preferred
    shareholders  was $0.00136 and $0.00344 per common share for the years ended
    December 31, 1996 and 1993,  respectively,  and to common  shareholders  was
    $0.004363 per share for the year ended December 31, 1996. Actual amount paid
    in excess of net realized gain on investments to preferred  shareholders was
    $0.0004 and $0.0007 per common  share for the years ended  December 31, 1996
    and 1995,  respectively,  and to common shareholders was $0.0013 and $0.0021
    per share for the years ended December 31, 1996 and 1995, respectively.

*** Actual  amount was $0.00006 per common  share.

  # A stock split occurred on July 24, 1995 (Note 4).

  + Total investment return is calculated assuming a purchase of common stock at
    the current  market price on the first day and a sale at the current  market
    price on the last day of the period.  Dividends and  distributions,  if any,
    are assumed for purposes of this  calculation,  to be  reinvested  at prices
    obtained under the Trust's  dividend  reinvestment  plan.  Total  investment
    return does not reflect brokerage commissions.

++  Ratios calculated on the basis of income and expenses applicable to both the
    common and preferred shares, and preferred stock dividends,  relative to the
    average net assets of common shareholders.

+++ Annualized.

The information above represents the unaudited operating  performance data for a
share of common stock outstanding,  total investment  return,  ratios to average
net  assets  and  other  supplemental  data  for  the  periods  indicated.  This
information has been determined based upon financial information provided in the
financial statements and market value data for Trust's shares.

                       See Notes to Financial Statements.


                                       9
<PAGE>


- --------------------------------------------------------------------------------
THE BLACKROCK CALIFORNIA INSURED
MUNICIPAL 2008 TERM TRUST INC.
NOTES TO FINANCIAL STATEMENTS (UNAUDITED)
- --------------------------------------------------------------------------------

NOTE 1.  ORGANIZATION  & ACCOUNTING  POLICIES The BlackRock  California  Insured
Municipal 2008 Term Trust Inc. (the "Trust") was organized in Maryland on August
7, 1992 as a  non-diversified  closed-end  management  investment  company.  The
Trust's  investment  objective is to manage a non-diversified  portfolio of high
quality  securities  that will  return  $15 per share to  investors  on or about
December 31, 2008 while providing current income exempt from regular federal and
California State income taxes. The ability of issuers of debt securities held by
the Trust to meet their obligations may be affected by economic  developments in
the state,  a specific  industry or region.  No assurance  can be given that the
Trust's investment objective will be achieved.

The following is a summary of significant  accounting  policies  followed by the
Trust.

SECURITIES VALUATION:  Municipal securities  (including  commitments to purchase
such  securities  on a  "when-issued"  basis)  are valued on the basis of prices
provided  by  a  pricing  service  which  uses   information   with  respect  to
transactions  in bonds,  quotations  from bond dealers,  market  transactions in
comparable   securities  and  various   relationships   between   securities  in
determining values. Any securities or other assets for which such current market
quotations  are not readily  available are valued at fair value as determined in
good faith under procedures established by and under the general supervision and
responsibility of the Trust's Board of Directors.

   Short-term  securities  which mature in 60 days are valued at current  market
quotations.  Short-term securities which mature in 60 days or less are valued at
amortized  cost,  if their term to maturity  from date of purchase is 60 days or
less or by  amortizing  their value on the 61st day prior to maturity,  if their
original term to maturity from date of purchase exceeded 60 days.

SECURITIES  TRANSACTIONS  AND INVESTMENT  INCOME:  Securities  transactions  are
recorded  on the trade  date.  Realized  and  unrealized  gains and  losses  are
calculated  on the  identified  cost basis.  Interest  income is recorded on the
accrual  basis and the Trust  amortizes  premium  and  accretes  original  issue
discount on securities purchased using the interest method.

FEDERAL  INCOME  TAXES:  It is the  Trust's  intention  to  continue to meet the
requirements  of the Internal  Revenue Code  applicable to regulated  investment
companies  and to distribute  sufficient  net income to  shareholders.  For this
reason and because  substantially  all of the Trust's  gross income  consists of
tax-exempt interest, no Federal income tax provision is required.

DIVIDENDS  AND  DISTRIBUTIONS:   The  Trust  declares  and  pays  dividends  and
distributions to common  shareholders  monthly from net investment  income,  net
realized short-term capital gains and other sources, if necessary. Net long-term
capital  gains,  if any,  in excess  of loss  carryforwards  may be  distributed
annually.  Dividends and  distributions  are recorded on the  ex-dividend  date.
Dividends and distributions to preferred shareholders are accrued and determined
as described in Note 4.

ESTIMATES:  The preparation of financial statements in conformity with generally
accepted  accounting  principles  requires  management  to  make  estimates  and
assumptions  that  affect the  reported  amounts of assets and  liabilities  and
disclosure of  contingent  assets and  liabilities  at the date of the financial
statements  and the  reported  amounts  of  revenues  and  expenses  during  the
reporting period. Actual results could differ from those estimates.

NOTE 2. AGREEMENTS The Trust has an Investment Advisory Agreement with BlackRock
Financial Management,  Inc. (the "Adviser"), a wholly-owned corporate subsidiary
of BlackRockAdvisors,  Inc., which is an indirect  majority-owned  subsidiary of
PNCBank,  N.A., and an Administration  Agreement with Princeton  Administrators,
L.P. (the "Administrator"), an indirect wholly-owned subsidiary of Merrill Lynch
& Co., Inc.

   The  investment  advisory  fee paid to the  Adviser  is  computed  weekly and
payable  monthly at an annual  rate of 0.35% of the Trust's  average  weekly net
investment  assets.  The  administration  fee paid to the  Administrator is also
computed  weekly and  payable  monthly at an annual rate of 0.10% of the Trust's
average weekly net investment assets.

   Pursuant to the agreements,  the Adviser provides  continuous  supervision of
the investment  portfolio and pays the compensation of officers of the Trust who
are  affiliated  persons of the Adviser.  The  Administrator  pays occupancy and
certain  clerical and accounting  costs of the Trust.  The Trust bears all other
costs and expenses.

NOTE 3.  PORTFOLIO  Purchases of investment  securities,  other than  short-term
investments, for the six months ended June 30, 1998



                                       10
<PAGE>


aggregated $2,031,700.  There were no sales, other than short-term  investments,
during the six months ended June 30, 1998

   The federal income tax basis of the Trust's  investments at June 30, 1998 was
substantially  the same as the basis for financial  reporting,  and accordingly,
gross and net  unrealized  appreciation  for  federal  income tax  purposes  was
$24,320,358.

NOTE 4.  CAPITAL  There are 200 million  shares of $.01 par value  common  stock
authorized.  Of the 10,407,093  common shares  outstanding at June 30, 1998, the
Adviser  owned 7,093  shares.  As of June 30, 1998,  there were 3,120  preferred
shares outstanding as follows: Series W28--1,560 and Series W7--1,560.

   The Trust may classify or reclassify any unissued shares of common stock into
one or more  series  of  preferred  stock.  On  November  23,  1992,  the  Trust
reclassified  1,560 shares of common stock and issued 2 series of Auction Market
Preferred Stock ("Preferred Stock") as follows:  Series W28--780 shares,  Series
W7--780 shares. The Preferred Stock has a liquidation value of $25,000 per share
plus any accumulated but unpaid dividends. On May 16, 1995 shareholders approved
a proposal to split each share of the Trust's  Auction Rate Municipal  Preferred
Stock  into two  shares  and  simultaneously  reduce  each  share's  liquidation
preference from $50,000 to $25,000 plus any  accumulated  but unpaid  dividends.
The stock split occurred on July 24, 1995.

    Dividends on Series W7 are  cumulative at a rate which is reset every 7 days
based on the results of an auction.  Dividends on Series W28 are also cumulative
at a rate  which is reset  every 28 days  based on the  results  of an  auction.
Dividend  rates  ranged from 2.35% to 3.95% during the six months ended June 30,
1998.

   The Trust may not declare dividends or make other  distributions on shares of
common  stock or purchase  any such  shares if, at the time of the  declaration,
distribution  or  purchase,  asset  coverage  with  respect  to the  outstanding
Preferred Stock would be less than 200%.

   The Preferred  Stock is redeemable at the option of the Trust, in whole or in
part, on any dividend  payment date at $25,000 per share plus any accumulated or
unpaid dividends whether or not declared. The Preferred Stock is also subject to
mandatory  redemption  at  $25,000  per  share  plus any  accumulated  or unpaid
dividends,  whether or not  declared  if certain  requirements  relating  to the
composition  of the  assets  and  liabilities  of the  Trust as set forth in the
Articles of Incorporation are not satisfied.

   The holders of  Preferred  Stock have voting  rights  equal to the holders of
common stock (one vote per share) and will vote  together with holders of shares
of common stock as a single class. However,  holders of Preferred Stock are also
entitled to elect two of the Trust's  directors.  In  addition,  the  Investment
Company Act of 1940 requires that along with approval by stockholders that might
otherwise  be  required,  the  approval  of the  holders  of a  majority  of any
outstanding  preferred shares, voting separately as a class would be required to
(a) adopt any plan of  reorganization  that would adversely affect the Preferred
Stock, and (b) take any action requiring a vote of security holders,  including,
among other  things,  changes in the Trust's  subclassification  as a closed-end
investment company or changes in its fundamental investment restrictions.

NOTE 5.  DIVIDENDS  Subsequent  to June 30, 1998,  the Board of Directors of the
Trust  declared a dividend from  undistributed  earnings of $0.064375 per common
share payable July 31, 1998 to shareholders of record on July 15, 1998.

   For the period July 1, 1998 to July 31, 1998, dividends declared on Preferred
Stock totalled  $196,541 in aggregate for the two  outstanding  Preferred  Stock
series.


                                       11
<PAGE>


- --------------------------------------------------------------------------------
         THE BLACKROCK CALIFORNIA INSURED MUNICIPAL 2008 TERM TRUST INC.
                           DIVIDEND REINVESTMENT PLAN
- --------------------------------------------------------------------------------

      Pursuant  to  the  Trust's  Dividend   Reinvestment   Plan  (the  "Plan"),
shareholders may elect to have all  distributions of dividends and capital gains
automatically reinvested by State Street Bank & Trust Company (the "Plan Agent")
in Trust shares.  Shareholders  who do not  participate in the Plan will receive
all distributions in cash paid by check in United States dollars mailed directly
to the  shareholders  of record  (or if the  shares  are held in street or other
nominee  name,  then to the nominee) by the  custodian,  as dividend  disbursing
agent.

      The Plan Agent serves as agent for the shareholders in  administering  the
Plan.  After the Trust  declares a dividend or determines to make a capital gain
distribution,  the Plan Agent will, as agent for the  participants,  receive the
cash  payment and use it to buy Trust  shares in the open market on the New York
Stock Exchange for the participants'  accounts.  The Trust will not issue shares
under the Plan.

      Participants in the Plan may withdraw from the Plan upon written notice to
the Plan Agent and will receive  certificates  for whole Trust shares and a cash
payment for any fraction of a Trust share.

      The Plan Agent's fees for the  handling of the  reinvestment  of dividends
and distributions will be paid by the Trust.  However, each participant will pay
a pro rata share of  brokerage  commissions  incurred  with  respect to the Plan
Agent's open market  purchases in connection with the  reinvestment of dividends
and  distributions.  The automatic  reinvestment of dividends and  distributions
will not relieve  participants  of any federal income tax that may be payable on
such dividends or distributions.

      Experience  under  the Plan  may  indicate  that  changes  are  desirable.
Accordingly,  the Trust  reserves  the right to amend or  terminate  the Plan as
applied to any dividend or distribution paid subsequent to written notice of the
change sent to all  shareholders of the Trust at least 90 days before the record
date  for the  dividend  or  distribution.  The  Plan  also  may be  amended  or
terminated  by the Plan  Agent  upon at least 90  days'  written  notice  to all
shareholders  of the Trust.  All  correspondence  concerning  the Plan should be
directed  to the Plan Agent at (800)  699-1BFM.  The  address is on the front of
this report.

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

     There have been no material changes in the Trust's investment objectives or
policies  that have not been  approved by the  shareholders.  There have been no
changes in the  Trust's  charter or  by-laws.  There have been no changes in the
principal risk factors  associated with investment in the Trust. There have been
no changes in the  persons  who are  primarily  responsible  for the  day-to-day
management of the Trust's portfolio.

     The Annual  Meeting of Trust  Shareholders  was held May 6, 1998 to vote on
the following matters:
      
     (1) To elect two Directors to serve as follows:

         DIRECTOR                            CLASS         TERM        EXPIRING
         -------                             -----         -----        -------
         Walter F. Mondale                    II         3 years         2001
         Ralph L.Schlosstein                  II         3 years         2001

         Directors whose term of office continues beyond this meeting are Andrew
         D.Brimmer,  Richard E. Cavanagh, Kent Dixon, Frank J. Fabozzi, Laurence
         D. Fink, James Grosfeld and James Clayburn La Force, Jr.

     (2) To ratify the selection of Deloitte & Touche LLP as independent  public
         accountants of the Trust for the fiscal year ending December 31, 1998.

         Shareholders  elected the two  Directors  and ratified the selection of
         Deloitte & Touche LLP. The results of the voting was as follows:

<TABLE>
<CAPTION>
                                                       VOTES FOR   VOTES AGAINST   ABSTENTIONS
                                                       ---------   -------------   -----------
<S>                                                    <C>            <C>            <C>   
         Walter F.Mondale ..........................   8,748,977           0          77,878
         Ralph L.Schlosstein .......................   8,698,122           0         128,733
         Ratification of Deloitte & Touche LLP .....   8,688,137      30,595         108,123
</TABLE>



                                       12
<PAGE>

- --------------------------------------------------------------------------------
        THE BLACKROCK CALIFORNIA INSURED MUNICIPAL 2008 TERM TRUST INC.
                               INVESTMENT SUMMARY
- --------------------------------------------------------------------------------

THE TRUST'S INVESTMENT OBJECTIVE

The  BlackRock   California  Insured  Municipal  2008  Term  Trust's  investment
objective  is  to  provide  current  income  exempt  from  regular  federal  and
California  income tax and to return $15 per share (the initial public  offering
price per share) to investors on or about December 31, 2008.

WHO MANAGES THE TRUST?

BlackRock  Financial  Management,   Inc.   ("BlackRock")  is  an  SEC-registered
investment  adviser.  BlackRock and its  affiliates  currently  manage over $119
billion  on behalf of  taxable  and  tax-exempt  clients  worldwide.  Strategies
include  fixed  income,  equity and cash and may  incorporate  both domestic and
international   securities.   Domestic  fixed  income  strategies   utilize  the
government,  mortgage,  corporate and municipal bond sectors.  BlackRock manages
twenty-one  closed-end  funds that are traded on either the New York or American
stock  exchanges,  and a $23 billion  family of open-end  equity and bond funds.
Current  institutional  clients  number 334,  domiciled in the United States and
overseas.

WHAT CAN THE TRUST INVEST IN?

The Trust  intends  to invest  at least  80% of its total  assets in  California
municipal  obligations  insured  as to  the  timely  payment  of  principal  and
interest.  The Trust  may  invest up to 20% in  uninsured  California  municipal
obligations  which are rated Aaa by Moody's or AAA by S&P, or are  determined by
the Adviser to be of comparable credit quality  (guaranteed,  escrowed or backed
in trust).

WHAT IS THE ADVISER'S INVESTMENT STRATEGY?

The Adviser will seek to meet the Trust's  investment  objective by managing the
assets of the Trust so as to return the initial  offering  price ($15 per share)
at maturity.  The Trust will implement a conservative strategy that will seek to
closely match the maturity of the assets of the portfolio with the future return
of the  initial  investment  at the end of  2008.  At the  Trust's  termination,
BlackRock expects that the value of the securities which have matured,  combined
with the value of the  securities  that are sold,  if any, will be sufficient to
return the initial offering price to investors. On a continuous basis, the Trust
will seek its  objective  by  actively  managing  its  portfolio  of  California
municipal  obligations  and  retaining a small  amount of income  each year.  In
addition to seeking the return of the initial  offering price,  the Adviser also
seeks to provide  current  income  exempt from  regular  federal and  California
income tax to  investors.  The  portfolio  managers will attempt to achieve this
objective  by investing  in  securities  that  provide  competitive  income.  In
addition,  leverage will be used (in an amount up to 35% of the total assets) to
enhance the income of the portfolio.  In order to maintain competitive yields as
the Trust approaches  maturity and depending on market  conditions,  the Adviser
will attempt to purchase  securities with call protection or maturities as close
to the Trust's maturity date as possible. Securities with call protection should
provide the portfolio with some degree of protection  against  reinvestment risk
during times of lower prevailing  interest rates. Since the Trust's primary goal
is to return the initial  offering  price at  maturity,  any cash that the Trust
receives  prior to its  maturity  date will be  reinvested  in  securities  with
maturities  which  coincide  with  the  remaining  term  of  the  Trust.   Since
shorter-term securities typically yield less than longer-term  securities,  this
strategy will likely result in a decline in the Trust's  income over time. It is
important to note that the Trust will be managed so as to preserve the integrity
of the return of the initial offering price. If market conditions,  such as high
interest rate volatility,  force a choice between current income and risking the
return  of the  initial  offering  price,  it is likely  that the  return of the
initial offering price will be emphasized.

HOW ARE THE TRUST'S  SHARES  PURCHASED  AND SOLD?  DOES THE TRUST PAY  DIVIDENDS
REGULARLY?

The  Trust's  shares are traded on the New York Stock  Exchange  which  provides
investors with  liquidity on a daily basis.  Orders to buy or sell shares of the
Trust must be placed through a registered broker or financial advisor. The Trust
pays monthly  dividends which are typically paid on the last business day of the
month. For shares held in the shareholder's name, dividends may be reinvested in
additional shares of the Trust through the Trust's transfer agent,  State Street
Bank and Trust Company. Investors who wish to hold shares in a brokerage account
should check with their financial  advisor to determine  whether their brokerage
firm offers dividend reinvestment services.



                                       13
<PAGE>


LEVERAGE CONSIDERATIONS IN A TERM TRUST

Under current  market  conditions,  leverage  increases the income earned by the
Trust.  The Trust employs leverage  primarily  through the issuance of preferred
stock.  Leverage  permits  the Trust to  borrow  money at  short-term  rates and
reinvest that money in longer-term  assets which typically offer higher interest
rates.  The  difference  between the cost of the  borrowed  funds and the income
earned on the proceeds that are invested in longer term assets is the benefit to
the Trust from  leverage.  In general,  the portfolio is typically  leveraged at
approximately  35% of total  assets.  Leverage  also  increases the duration (or
price  volatility  of the net  assets)  of the  Trust,  which  can  improve  the
performance  of the Trust in a  declining  rate  environment,  but can cause net
assets to decline faster than the market in a rapidly  rising rate  environment.
BlackRock's  portfolio  managers  continuously  monitor and regularly review the
Trust's  use of  leverage  and the Trust may  reduce,  or unwind,  the amount of
leverage  employed  should  BlackRock  consider that reduction to be in the best
interests of the shareholders.

SPECIAL CONSIDERATIONS AND RISK FACTORS RELEVANT TO TERM TRUSTS

THE TRUST IS  INTENDED  TO BE A  LONG-TERM  INVESTMENT  AND IS NOT A  SHORT-TERM
TRADING VEHICLE.

RETURN OF INITIAL  INVESTMENT.  Although the objective of the Trust is to return
its initial offering price upon termination, there can be no assurance that this
objective will be achieved.

DIVIDEND  CONSIDERATIONS.  The income and dividends paid by the Trust are likely
to  decline  to some  extent  over the term of the Trust due to the  anticipated
shortening of the dollar-weighted average maturity of the Trust's assets.

LEVERAGE.  The Trust utilizes  leverage  through the issuance of preferred stock
which involves  special risks.  The Trust's net asset value and market value may
be more volatile due to its use of leverage.

MARKET PRICE OF SHARES.  The shares of closed-end  investment  companies such as
the Trust trade on the New York Stock  Exchange  (NYSE symbol:  BFC) and as such
are subject to supply and demand influences.  As a result, shares may trade at a
discount or a premium to their net asset value.

ILLIQUID  SECURITIES.  The Trust may  invest in  securities  that are  illiquid,
although  under current  market  conditions the Trust expects to do so to only a
limited extent. Investing in these securities involves special risks.

ANTITAKEOVER  PROVISIONS.  Certain antitakeover provisions will make a change in
the Trust's  business or management  more difficult  without the approval of the
Trust's Board of Directors and may have the effect of depriving  shareholders of
an  opportunity  to sell their shares at a premium above the  prevailing  market
price.

MUNICIPAL OBLIGATIONS.  Municipal obligations include debt obligations issued by
states,  cities, and local authorities,  and possessions and certain territories
of the United States to obtain funds for various public purposes,  including the
construction of public  facilities,  the refinancing of outstanding  obligations
and the obtaining of funds for general operating expenses and for loans to other
public  institutions  and  facilities.  The value of municipal  debt  securities
generally  varies  inversely with changes in prevailing  market  interest rates.
Depending  on the amount of call  protection  that the  securities  in the Trust
have, the Trust may be subject to certain  reinvestment risks in environments of
declining interest rates.

ALTERNATIVE  MINIMUM TAX (AMT).  The Trust may invest in  securities  subject to
AMT. The Trust currently holds no securities that are subject to AMT.



                          14
<PAGE>


- --------------------------------------------------------------------------------
         THE BLACKROCK CALIFORNIA INSURED MUNICIPAL 2008 TERM TRUST INC.
                                    GLOSSARY
- --------------------------------------------------------------------------------


CLOSED-END FUND:         Investment  vehicle  which  initially  offers  a  fixed
                         number of shares  and trades on a stock  exchange.  The
                         fund invests in a portfolio of securities in accordance
                         with its stated investment objectives and policies.

DISCOUNT:                When a fund's net asset value is greater than its stock
                         price, the fund is said to be trading at a discount.

DIVIDEND:                Income  generated  by  securities  in a  portfolio  and
                         distributed   to   shareholders   after   deduction  of
                         expenses. This  Trust  declares and pays dividends on a
                         monthly basis.

DIVIDEND REINVESTMENT:   Shareholders  may have all  distributions  of dividends
                         and  capital  gains   automatically   reinvested   into
                         additional shares of the Trust.

MARKET PRICE:            Price per share of a security  trading in the secondary
                         market.  For a  closed-end  fund,  this is the price at
                         which  one  share  of the  fund  trades  on  the  stock
                         exchange.  If you were to buy or sell shares, you would
                         pay or receive the market price.

NET ASSET VALUE (NAV):   Net  asset  value  is the  total  market  value  of all
                         securities  and other  assets  held by the Trust,  plus
                         income accrued on its investment, minus any liabilities
                         including  accrued  expenses,  dividend  by  the  total
                         number  of  outstanding  shares.  It is the  underlying
                         value of a single share on a given day. Net asset value
                         for the Trust is  calculated  weekly and  published  in
                         BARRON'S  on Saturday  and THE WALL  STREET  JOURNAL on
                         Monday.

PREMIUM:                 When a fund's stock price is greater than its net asset
                         value, the fund is said to be trading at a premium.

PRE-REFUNDED BONDS:      These  securities  are   collateralized   by  the  U.S.
                         Government  securities which are held in escrow and are
                         used to pay  principal  and interest on the  tax-exempt
                         issue  and to  retire  the  bond in  full  at the  date
                         indicated, typically at a premium to par.



                          15
<PAGE>


BlackRock

DIRECTORS
Laurence D. Fink, CHAIRMAN
Andrew F. Brimmer
Richard E. Cavanagh
Kent Dixon
Frank J. Fabozzi
James Grosfeld
James Clayburn La Force, Jr.
Walter F. Mondale
Ralph L. Schlosstein

OFFICERS
Ralph L. Schlosstein, PRESIDENT
Keith T. Anderson, VICE PRESIDENT
Michael C. Huebsch, VICE PRESIDENT
Robert S. Kapito, VICE PRESIDENT
Kevin Klingert, VICE PRESIDENT
Richard M. Shea, VICE PRESIDENT/TAX
Henry Gabbay, TREASURER
James Kong, ASSISTANT TREASURER
Karen H. Sabath, SECRETARY

INVESTMENT ADVISER
BlackRock Financial Management, Inc.
345 Park Avenue
New York, NY 10154
(800) 227-7BFM

ADMINISTRATOR
Princeton Administrators, L.P.
P.O.Box 9095
Princeton, NJ 08543-9095
(800) 543-6217

CUSTODIAN AND TRANSFER AGENT
State Street Bank and Trust Company
One Heritage Drive
North Quincy,  MA 02171 
(800) 669-1BFM  

AUCTION AGENT 
Bankers Trust Company 
Four Albany Street 
New York, NY 10006 

INDEPENDENT  AUDITORS 
Deloitte & Touche LLP 
Two World Financial Center 
New York, NY 10281-1434 

LEGAL COUNSEL
Skadden, Arps, Slate, Meagher & Flom LLP
919 Third Avenue
New York, NY 10022

The accompanying  financial statements as of June 30, 1998 were not audited and,
accordingly, no opinion is expressed on them.

This report is for shareholder  information.  This is not a prospectus  intended
for use in the purchase or sale of any securities.

            THE BLACKROCK CALIFORNIA INSURED
             MUNICIPAL 2008 TERM TRUST INC.
           c/o Princeton Administrators, L.P.
                      P.O.Box 9095
                Princeton, NJ 08543-9095
                     (800) 699-1BFM

                                                                   09247G 10 8
                                                                   09247G 20 7
                                                                   09247G 30 8

[LOGO] Printed on recycled paper

                              THE BLACKROCK
                              CALIFORNIA INSURED 
                              MUNICIPAL 2008
                              TERM TRUST INC.
                              ==================================================
                              SEMI-ANNUAL REPORT
                              JUNE 30, 1998



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