BLACKROCK CALIFORNIA INVESTMENT QUALITY MUNICIPAL TRUST INC
N-30D, 1998-07-01
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- --------------------------------------------------------------------------------
        THE BLACKROCK CALIFORNIA INVESTMENT QUALITY MUNICIPAL TRUST INC.
                       SEMI-ANNUAL REPORT TO SHAREHOLDERS
                          REPORT OF INVESTMENT ADVISER
- --------------------------------------------------------------------------------

                                                                    May 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 remained  relatively  robust,  spurred by lower
interest rates and strong consumer  demand.  However,  the economic  weakness of
Asia looms large.  While the fallout from the Asian fiscal  crisis  probably has
yet to  materialize  in the U.S., we expect a "slowdown" in Asia's  economies to
slow U.S.  growth in 1998.  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 a
$118  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>

                                                                    May 31, 1998

Dear Shareholder:

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

      The Trust is a  non-diversified,  actively  managed  closed-end  bond fund
whose shares are traded on the American  Stock  Exchange under the symbol "RAA".
The Trust's  investment  objective  is to provide  high  current  income that is
exempt from regular  federal and  California  income taxes  consistent  with the
preservation  of capital.  The Trust seeks to achieve its objective by investing
in  investment  grade  (rated  "AAA"  to "BBB" by a major  rating  agency  or of
equivalent  quality)  municipal debt securities  issued by local  municipalities
throughout California.

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

- --------------------------------------------------------------------------------
                           4/30/98     10/31/97     CHANGE      HIGH       LOW
- --------------------------------------------------------------------------------
STOCK PRICE                 $15.75      $15.00       5.00%     $16.125   $14.875
- --------------------------------------------------------------------------------
NET ASSET VALUE (NAV)       $14.95      $14.77       1.22%     $15.29    $14.73
- --------------------------------------------------------------------------------

THE FIXED INCOME MARKETS

      The first four months of 1998 have witnessed  continued rapid expansion of
the U.S.  economy.  GDP  growth  is  estimated  at an annual  rate of 4.2%,  far
exceeding  the  historical  non-inflationary  level of 2%.  Despite  the  strong
economic growth,  inflation stayed surprisingly subdued.  After rising only 1.7%
in 1997,  inflation inched higher at a 0.2% annual rate for the first quarter of
1998.  One  explanation  for the absence of inflation in the U.S.  economy stems
from the aftermath of the Asian crisis. U.S. exports to Asia have slowed,  while
the strength of the dollar caused cheaper Asian imports to flood the U.S. market
and exert downward price pressure on domestic goods.

      The Treasury  market  rallied  during the fourth  quarter of 1997 and into
1998  before  giving  back  some  gains  during  the  past few  months.  For the
semi-annual  period,  the yield of the 10-year Treasury security fell from 5.83%
on October 31, 1997 to 5.67% on April 30, 1998.  The strong  performance  of the
Treasury market was in response 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
surplus in the federal budget and 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.

      Municipal bonds underperformed the taxable domestic bond market during the
past six months,  returning  2.77% (as measured by the Lehman  Municipal  Index)
versus the Lehman  Aggregate  Index's 3.58% 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
investors  focus  on  the  equity  markets.   We  believe  that  municipals  are
attractively  valued versus Treasuries and our outlook for municipal  securities
is favorable.  The robust economy  continues to strengthen the credit quality of
most  issuers,  and we expect  that the  attractive  taxable  equivalent  yields
offered by municipal securities should bring investors back into the market.

                                       2
<PAGE>

      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  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.


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  employs  leverage  to  enhance  its  income  by
borrowing at  short-term  municipal  rates and  investing the proceeds in longer
maturity  issues  that have  higher  yields.  The  degree to which the Trust can
benefit  from its use of  leverage  may affect its  ability to pay high  monthly
income.  At the end of the semi-annual  period,  the Trust's leverage amount was
33% of total assets.  During the past six months,  the Trust's  borrowing  costs
have remained favorable.

      Within the municipal  market, we find the best relative value on the yield
curve to be in the 14 to 17 year  sector of the yield  curve,  which we  believe
offers the most  attractive  taxable  equivalent  yields for the least amount of
incremental duration.  Additionally, the Trust has been emphasizing higher rated
credits (AA- and AAA-rated  issues) over lower rated credits (BBB and A) to take
advantage of  historically  narrow credit spreads between higher and lower rated
bonds.

      The  following  charts  compare the  Trust's  current and October 31, 1997
asset composition and credit quality allocations:


                                SECTOR BREAKDOWN
================================================================================
  SECTOR                               APRIL 30, 1998     OCTOBER 31, 1997
- --------------------------------------------------------------------------------
University                                   20%                 20%
- --------------------------------------------------------------------------------
Transportation                               20%                 20%
- --------------------------------------------------------------------------------
Lease                                        12%                 11%
- --------------------------------------------------------------------------------
District                                     10%                  --
- --------------------------------------------------------------------------------
Housing                                       9%                 10%
- --------------------------------------------------------------------------------
Power                                         9%                 10%
- --------------------------------------------------------------------------------
City, County & State                          5%                  5%
- --------------------------------------------------------------------------------
Water & Sewer                                 5%                  5%
- --------------------------------------------------------------------------------
Student Loans                                 5%                  5%
- --------------------------------------------------------------------------------
Industrial                                    5%                  5%
- --------------------------------------------------------------------------------
Sales Tax                                     --                  5%
- --------------------------------------------------------------------------------
Miscellaneous Revenue                         --                  4%
================================================================================

                                       3
<PAGE>

================================================================================
STANDARD & POOR'S/MOODY'S/FITCH'S
          CREDIT RATING               APRIL 30, 1998       OCTOBER 31, 1997
- --------------------------------------------------------------------------------
             AAA/Aaa                        50%                   52%
- --------------------------------------------------------------------------------
              AA/Aa                         20%                   21%
- --------------------------------------------------------------------------------
               A/A                          21%                   22%
- --------------------------------------------------------------------------------
             BBB/Baa                        9%                     5%
================================================================================

      We look  forward to  continuing  to manage  the Trust to benefit  from the
opportunities  available to investors in the investment grade municipal  market.
We  thank  you for your  investment  and  continued  interest  in The  BlackRock
California  Investment Quality Municipal Trust Inc. Please feel free to call our
marketing  center at (800)  227-7BFM  (7236) if you have any specific  questions
which were not addressed in this report.


      Sincerely,

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


================================================================================
        THE BLACKROCK CALIFORNIA INVESTMENT QUALITY MUNICIPAL TRUST INC.
- --------------------------------------------------------------------------------
Symbol on American Stock Exchange:                                  RAA
- --------------------------------------------------------------------------------
Initial Offering Date:                                         May 28, 1993
- --------------------------------------------------------------------------------
Closing Stock Price as of 4/30/98:                                $15.75
- --------------------------------------------------------------------------------
Net Asset Value as of 4/30/98:                                    $14.95
- --------------------------------------------------------------------------------
Yield on Closing Stock Price as of 4/30/98 ($15.75)1:              5.57%
- --------------------------------------------------------------------------------
Current Monthly Distribution per Share2:                         $0.073125
- --------------------------------------------------------------------------------
Current Annualized Distribution per Share2:                       $0.8775
================================================================================

1 Yield on Closing Stock Price is  calculated by dividing the current annualized
  distribution per share by the closing stock price per share.
2 The distribution is not constant and is subject to change.

                                       4
<PAGE>



- --------------------------------------------------------------------------------
THE BLACKROCK CALIFORNIA INVESTMENT QUALITY MUNICIPAL TRUST INC.
PORTFOLIO OF INVESTMENTS APRIL 30, 1998 (UNAUDITED)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>

         PRINCIPAL
          AMOUNT                                                                           OPTION CALL        VALUE
  RATING*  (000)                                DESCRIPTION                                PROVISIONS       (NOTE 1)
- ---------------------------------------------------------------------------------------------------------------------------
<S>       <C>        <C>                                                                <C>              <C>
                     LONG-TERM INVESTMENTS--146.3%
                     California Educational Facilities Auth. Rev.,
AAA       $1,000       Santa Clara Univ., 5.00%, 9/01/15, MBIA ........................   9/06 at 102    $    974,900
AAA        1,000       Student Loan Program, Series A, 6.00%, 3/01/16, MBIA ...........   3/07 at 102       1,045,670
A1         1,000     California St., G.O., 3/01/19 ....................................   3/05 at 101       1,078,211
                     California St. Hsg. Fin. Agcy. Rev., Home Mtge.,
Aa2          945       Ser. B-1, 6.45%, 2/01/11 .......................................   8/04 at 102       1,001,369
Aa2        1,000       Ser. G, 7.20%, 8/01/14 .........................................   8/04 at 102       1,093,710
                     California St. Pub. Wks. Brd. Lease Rev.,
Aaa        1,000       Dept. of Corrections, Ser. A, 6.875%, 11/01/04 .................           N/A       1,153,460
A          1,000       St. Univ. Proj., Ser. A, 6.10%, 10/01/06 .......................  10/04 at 102       1,093,120
AAA        1,000       St. Univ. Proj., Ser. A., 6.40%, 12/01/02, AMBAC                           N/A       1,102,750
Baa        1,385     Foothill / Eastern Trans. Agcy., Ser. A, Zero Coupon, 1/01/04 ....  No Opt. Call       1,044,595
AAA        1,000     Los Angeles Cnty. Special Tax, Ser. A, 5.50%, 9/01/14, FSA .......  No Opt. Call       1,040,620
AA         1,150     Los Angeles Harbor Dept. Rev., Ser. B, 6.00%, 8/01/13 ............   8/06 at 101       1,232,984
AAA        1,000     Los Angeles Met. Trans. Auth. Sales Tax Rev., 6.00%, 7/01/26, MBIA   7/06 at 101       1,064,050
AA         1,000     Los Angeles Pub. Wks. Fin. Auth. Rev., Regl. Park & Open Space,
                       Dist. A, 6.00%, 10/01/04 .......................................           N/A       1,100,600
BBB-       1,000     Sacramento Pwr. Auth., Cogeneration Proj. Rev., 6.50%, 7/01/09 ...   7/06 at 102       1,086,170
AAA        1,000     San Diego Ind. Dev. Rev., Ser. A, 5.90%, 6/01/18, AMBAC ..........   6/03 at 102       1,051,150
                     San Francisco City & Cnty.,
AAA        1,000       Arpt. Comn. Rev., Intl. Arpt., Ser. 6, 6.125%, 5/01/09, AMBAC ..   5/04 at 102       1,086,970
AAA        1,000       Sewer Rev., Ser. A, 5.95%, 10/01/25, FGIC ......................  10/03 at 102       1,053,090
AAA        1,000     Southern California Pub. Pwr. Auth. Transmission Proj. Rev.,
                       5.50%, 7/01/20, MBIA ...........................................   7/02 at 100       1,007,520
                     Univ. of California Rev.,
AAA        1,000       Ser. D, 6.10%, 9/01/02  , MBIA .................................           N/A       1,086,870
A          1,135       Ser. B, 6.30%, 9/01/03 .........................................           N/A       1,254,255
AAA          370     West Basin Municipal Water Dist. Rev., C.O.P.,
                       Ser. A, 5.50%, 8/01/22, AMBAC ..................................   8/07 at 101         376,967
                                                                                                           ----------
                     Total long-term investments (cost $20,184,899) ...................                    22,029,031
                                                                                                          -----------

                     SHORT-TERM INVESTMENTS**--1.3%
A-1+         100     California St. Hlth. Fac. Fin. Auth.
                       Rev., Sutter Hlth. Sys. Proj., Ser. A, 4.10%, 5/01/98, FRDD ....           N/A         100,000
A-1+         100     Orange Cnty. Sanitation Dists., C.O.P.
                       4.10%, 5/01/98, FRDD ...........................................           N/A         100,000
                                                                                                          -----------
                     Total short-term investments (cost $200,000) .....................                       200,000
                                                                                                          -----------
                     TOTAL INVESTMENTS--147.6% (cost $20,384,899) .....................                    22,229,031
                     Other assets in excess of liabilities--2.2% ......................                       327,018
                     Liquidation value of preferred stock--(49.8)% ....................                    (7,500,000)
                                                                                                          -----------
                     NET ASSETS APPLICABLE TO COMMON SHAREHOLDERS--100% ...............                   $15,056,049
                                                                                                          ===========
</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  earlier of the next date on which the
   security  can be  redeemed  at par,  or the next  date on  which  the rate of
   interest is adjusted.
 + Option call provisions: date (month/year) and prices of the earliest optional
   call on  redemption. There  may be other call provisions at varying prices at
   later dates.
++ This bond is prerefunded. See Glossary for definitions.

- --------------------------------------------------------------------------------
                              KEY TO ABBREVIATIONS

AMBAC  -- American Municipal Bond           FSA  -- Financial Security Assurance
          Assurance Corporation             G.O. -- General Obligation Bond  
C.O.P. -- Certificate of Participation      MBIA -- Municipal Bond Insurance 
FGIC   -- Financial Guaranty Insurance               Association             
          Company                           
FRDD   -- Floating Rate Daily Demand
- --------------------------------------------------------------------------------

                       See Notes to Financial Statements.


                                       5
<PAGE>

- ---------------------------------------------------------
THE BLACKROCK CALIFORNIA INVESTMENT
QUALITY MUNICIPAL TRUST INC.
STATEMENT OF ASSETS AND LIABILITIES
APRIL 30, 1998 (UNAUDITED)
- ---------------------------------------------------------

ASSETS
Investments, at value (cost $20,384,899)
  (Note 1) .................................. $22,229,031
Cash ........................................      45,439
Interest receivable .........................     306,642
Deferred organization expenses and other 
  assets ....................................         300
                                              -----------
                                               22,581,412
                                              -----------
LIABILITIES
Advisory fee payable (Note 2) ...............       6,550
Administration fee payable (Note 2) .........       1,872
Dividends payable-preferred stock ...........         719
Other accrued expenses ......................      16,222
                                              -----------
                                                   25,363
                                              -----------

NET INVESTMENT ASSETS ....................... $22,556,049
                                              ===========

Net investment assets were comprised of:
  Common stock:
    Par value (Note 4) ...................... $    10,071
    Paid-in capital in excess of par ........  13,897,103
  Preferred stock (Note 4) ..................   7,500,000
                                              -----------
                                               21,407,174
  Undistributed net investment income .......     123,448
  Accumulated net realized loss .............    (818,705)
  Net unrealized appreciation ...............   1,844,132
                                              -----------
  Net investment assets, April 30, 1998 ..... $22,556,049
                                              ===========
  Net assets applicable to common 
    shareholders ............................ $15,056,049
                                              ===========
Net asset value per share:
  ($15,056,049 / 1,007,093 shares of common
  stock issued and outstanding) .............     $14.95
                                                  ======

- ---------------------------------------------------------
THE BLACKROCK CALIFORNIA INVESTMENT
QUALITY MUNICIPAL TRUST INC.
STATEMENT OF OPERATIONS
SIX MONTHS ENDED APRIL 30, 1998 (UNAUDITED)
- ---------------------------------------------------------

NET INVESTMENT INCOME
Income
Interest and discount earned ................   $ 632,837
                                               ----------

Expenses
  Investment advisory .......................      39,453
  Administration ............................      11,272
  Auction agent .............................       9,500
  Directors .................................       6,000
  Transfer agent ............................       4,000
  Audit .....................................       4,000
  Legal .....................................       4,000
  Reports to shareholders ...................       3,000
  Custodian .................................       1,500
  Miscellaneous .............................      10,484
                                               ----------
  Total expenses ............................      93,209
                                               ----------
Net investment income .......................     539,628
                                               ----------

UNREALIZED GAIN ON
INVESTMENTS (NOTE 3)
Net change in unrealized appreciation
  on investments ............................     205,636
                                               ----------

NET INCREASE IN NET INVESTMENT
ASSETS RESULTING FROM OPERATIONS ............   $ 745,264
                                               ==========

                       See Notes to Financial Statements.

                                       6
<PAGE>


- --------------------------------------------------------------------------------
THE BLACKROCK CALIFORNIA INVESTMENT QUALITY MUNICIPAL TRUST INC.
STATEMENTS OF CHANGES IN NET INVESTMENT ASSETS (UNAUDITED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>

INCREASE (DECREASE) IN NET INVESTMENT ASSETS                                            SIX MONTHS          YEAR
                                                                                           ENDED            ENDED
                                                                                      APRIL 30, 1998  OCTOBER 31, 1997
                                                                                      --------------  ----------------
<S>                                                                                     <C>            <C>         
Operations:
   Net investment income ............................................................ $   539,628       $ 1,080,949
   Net realized gain on investments                                                            --             1,100
   Net change in unrealized appreciation on investments .............................     205,636           618,624
                                                                                      -----------       -----------
   Net increase in net investment assets resulting from operations ..................     745,264         1,700,673

Dividends and distributions:
   To common shareholders from net investment income ................................    (441,821)         (876,796)
   To preferred shareholders from net investment income .............................    (120,868)         (245,735)
   To common shareholders in excess of net realized gains on investments ............          --              (564)
   To preferred shareholders in excess of net realized gains on investments .........          --              (186)
                                                                                      -----------       -----------

   Total dividends and distributions ................................................    (562,689)       (1,123,281)
                                                                                      -----------       -----------

     Total increase .................................................................     182,575           577,392

NET INVESTMENT ASSETS

Beginning of period .................................................................  22,373,474        21,796,082
                                                                                      -----------       -----------
End of period ....................................................................... $22,556,049       $22,373,474
                                                                                      ===========       ===========
</TABLE>

                       See Notes to Financial Statements.

                                       7
<PAGE>

- --------------------------------------------------------------------------------
THE BLACKROCK CALIFORNIA INVESTMENT QUALITY MUNICIPAL TRUST INC.
FINANCIAL HIGHLIGHTS (UNAUDITED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>

                                                                                                          FOR THE PERIOD
                                                                                                           JUNE 4, 1993*
                                               SIX MONTHS                 YEAR ENDED OCTOBER 31,              THROUGH
                                                  ENDED      ---------------------------------------------  OCTOBER 31,
PER SHARE OPERATING PERFORMANCE:              APRIL 30,1998      1997        1996        1995       1994        1993
                                               -----------       ----        ----        ----       ----    -----------
<S>                                              <C>            <C>        <C>         <C>         <C>        <C>    
Net asset value, beginning of period             $ 14.77        $ 14.20    $ 13.85     $ 11.74     $ 14.73    $ 14.10
                                                 -------        -------    -------     -------     -------    -------
  Net investment income                              .54           1.07       1.08        1.05        1.04        .31
  Net realized and unrealized gain 
     (loss) on investments                           .20            .61        .33        2.12       (3.01)       .83
                                                 -------        -------    -------     -------     -------    -------
Net increase (decrease) from 
  investment operations                              .74           1.68       1.41        3.17       (1.97)      1.14
                                                 -------        -------    -------     -------     -------    -------
Dividends and Distributions:
  Dividends from net investment income to:
    Common shareholders                             (.44)          (.87)      (.80)       (.79)       (.79)      (.20)
    Preferred shareholders                          (.12)          (.24)      (.25)       (.27)       (.18)      (.40)
  Distributions from capital gains to:
    Common shareholders                               --             --         --          --        (.03)        --
    Preferred shareholders                            --             --         --          --        (.01)        --
Distributions in excess of net realized 
    gains on investments to:
    Common shareholders                               --            ***       (.01)         --          --         --
    Preferred shareholders                            --            ***        ***          --          --         --
                                                 -------        -------    -------     -------     -------    -------
  Total dividends and distributions                 (.56)         (1.11)     (1.06)      (1.06)      (1.01)      (.24)
                                                 -------        -------    -------     -------     -------    -------
Capital charge with respect to issuance of
 common and preferred stock                           --             --         --          --       (.01)       (.27)
                                                 -------        -------    -------     -------     -------    -------
Net asset value, end of period**                 $ 14.95        $ 14.77    $ 14.20     $ 13.85     $ 11.74    $ 14.73#
                                                 =======        =======    =======     =======     =======    ======= 
Per share market value, end of period**          $ 15.75        $ 15.00    $ 13.50     $12.625     $10.625    $ 14.00
                                                 =======        =======    =======     =======     =======    =======
TOTAL INVESTMENT RETURN+:                          8.02%         17.98%     13.80%      26.86%    (18.85)%       .68%
RATIOS TO AVERAGE NET ASSETS OF
 COMMON SHAREHOLDERS++:
Expenses                                           1.24%+++       1.32%      1.42%       1.52%       1.25%      1.07%+++
Net investment income before preferred
   stock dividends                                 7.18%+++       7.48%      7.78%       8.24%       7.81%      5.31%+++
Preferred stock dividends                          1.61%+++       1.70%      1.82%       2.09%       1.36%      0.73%+++
Net investment income available to common
   shareholders                                    5.57%+++       5.78%      5.96%       6.15%       6.45%      4.58%+++

SUPPLEMENTAL DATA:
Average net assets of common shareholders
  (in thousands)                                $ 15,169       $ 14,445   $ 13,996    $ 12,892    $ 13,362   $ 14,504
Portfolio turnover rate                               4%            28%        72%        149%        184%        13%
Net assets of common shareholders, end of 
   period (in thousands)                        $ 15,056       $ 14,873   $ 14,296    $ 13,946    $ 11,826   $ 14,836
Asset coverage per share of preferred stock,
  end of period##                               $ 75,187       $ 74,583   $ 72,654    $ 71,485    $128,837   $148,910
Preferred stock outstanding (in thousands)      $  7,500       $  7,500   $  7,500    $  7,500    $  7,500   $  7,500

</TABLE>

- ----------
   * Commencement of investment operations.
  ** Net asset value and  market value  are published in The Wall Street Journal
     each  Monday.
 *** Actual  amount  paid  for the year ended  October 31, 1997 to common share-
     holders was $0.00056 per share and to preferred  shareholders  was $0.00018
     per common share. Actual amount paid to preferred shareholders for the year
     ended  October 31, 1996 was  $0.0048  per common  share.
   # Net asset  value immediately after the closing of the first public offering
     was $14.01.
  ## 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  value on the first  day and a sale at the  current
     market  price  on the  last  day of each  period  reported.  Dividends  and
     distributions are assumed for purposes of this calculation to be reinvested
     at prices  obtained  under the Trust's  dividend  reinvestment  plan.  This
     calculation  does  not  reflect  brokerage  commissions.  Total  investment
     returns for periods of less than one year are not annualized.
  ++ Ratios are calculated on the basis of income, expenses and preferred  stock
     dividends  applicable to both the common and preferred  shares  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, ratio to average net
assets and other  supplemental data for the period  indicated.  This information
has been determined based upon financial  information  provided in the financial
statements and market value data for the Trust's common stock.

                       See Notes to Financial Statements.


                                       8
<PAGE>


- --------------------------------------------------------------------------------
THE BLACKROCK CALIFORNIA INVESTMENT
QUALITY MUNICIPAL TRUST INC.
NOTES TO FINANCIAL STATEMENTS (UNAUDITED)
- --------------------------------------------------------------------------------

NOTE 1. ACCOUNTING            The BlackRock California  Investment Quality Muni-
POLICIES                      cipal  Trust Inc. (the  "Trust") was  organized in
                              Maryland  on April 12, 1993  as a  non-diversified
closed-end management investment company. The Trust's investment objective is to
provide high current  income exempt from regular  federal and  California  state
income taxes consistent with the preservation of capital. 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 more than 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  accretes  original  issue  discounts  or amortizes
premium on securities purchased using the interest method. 

FEDERAL INCOME TAXES: For federal income tax purposes, the Trust is treated as a
separate taxpaying entity. It is the intent of the Trust to continue to meet the
requirements  of the Internal  Revenue Code  applicable to regulated  investment
companies  and to  distribute  all of its 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.

DEFERRED  ORGANIZATION  EXPENSES:  A total of $16,000 was incurred in connection
with the organization of the Trust. These costs have been deferred and are being
amortized  ratably  over a period  of  sixty  months  from  the  date the  Trust
commenced investment operations.

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 BlackRock Advisors,  Inc., which is an indirect majority-owned  subsidiary of
PNC Bank, N.A., and an Administration Agreement with Prudential Investments Fund
Management LLC ("PIFM"), an indirect,  wholly-owned subsidiary of The Prudential
Insurance Company of America.

   The investment 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 PIFM 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.  PIFM pays occupancy and certain clerical
and accounting costs of the Trust. The Trust bears all other costs and expenses.


                                       9
<PAGE>


NOTE 3. PORTFOLIO             There  were no  purchases Securities  and sales of
                              investment  securities,  other   than   short-term
investments, for the six months ended April 30, 1998.

   The federal income tax basis of the Trust's investments at April 30, 1998 was
substantially  the same as the  basis  for  financial  reporting  purposes  and,
accordingly, net and gross unrealized appreciation was $1,844,132.

   For federal income tax purposes, the Trust had a capital loss carryforward at
October  31,  1997  of  approximately   $817,000  which  will  expire  in  2002.
Accordingly, no capital gain distribution is expected to be paid to shareholders
until net gains have been realized in excess of such amount.

NOTE 4. CAPITAL               There  are  200 million  shares  of $.01 par value
                              common  stock authorized. Of  the 1,007,093 shares
outstanding at April 30, 1998,  the Adviser owned 7,093 shares.  As of April 30,
1998 there were 300 shares of Preferred Stock Series W7 outstanding.

   The Trust may classify or reclassify any unissued shares of common stock into
one or more series of preferred  stock. On July 29, 1993 the Trust  reclassified
150 shares of common stock and issued a series of Auction Market Preferred Stock
("Preferred  Stock") Series W7. The Preferred  Stock had a liquidation  value of
$50,000 per share plus any  accumulated  but unpaid  dividends.  On May 16, 1995
shareholders approved a proposal to split each share of 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.  Dividend  rates  ranged from 3.10% to 3.76%
during the six months ended April 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
shares 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 April 30, 1998, the Board of Direc-
                              tors  of  the  Trust  declared  a  dividend   from
undistributed  earnings of  $.073125  per common  share  payable May 29, 1998 to
shareholders  of record on May 15,  1998.

   For the period May 1, 1998 to May 31, 1998,  dividends  declared on Preferred
Stock totalled $22,309 in aggregate for the outstanding Preferred Stock.


                                       10
<PAGE>



- --------------------------------------------------------------------------------
        THE BLACKROCK CALIFORNIA INVESTMENT QUALITY MUNICIPAL TRUST INC.
                            DIVIDEND INVESTMENT PLAN
- --------------------------------------------------------------------------------

   Pursuant to the Trust's Dividend Reinvestment Plan (the "Plan"), shareholders
will  automatically  have all  distributions  of  dividends  and  capital  gains
reinvested  by State Street Bank and Trust  Company (the "Plan  Agent") in Trust
shares  pursuant to the Plan unless an election is made to receive  such amounts
in cash.  The Plan Agent will effect  purchases  of shares under the Plan in the
open market.  Shareholders who elect not to 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 Transfer Agent, 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 American
Stock Exchange or elsewhere,  for the participants' accounts. The Trust will not
issue any new shares in connection with 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 shares.

   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,  state or local income taxes 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 by the Plan
Agent upon at least 90 days' written  notice to all  shareholders  of the Trust.
The Plan may be  terminated by the Plan Agent or the Trust upon at least 30 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 addresses
are 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 or to its charter or
by-laws or 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 as follows:

         Director                       Class        Term           Expiring
         -------                        -----        -----           -------
         James Grosfeld ...............   I         3 years           2000
         James Clayburn La Force, Jr. .   I         3 years           2000

         Directors whose term of office continues beyond this meeting are Andrew
         F. Brimmer, Kent Dixon, Laurence D, Fink, Walter F. Mondale, Richard E.
         Cavanagh, Frank J. Fabozzi, and Ralph L. Schlosstein.

     (2) To ratify the selection of  Deloitte & Touche LLP as independent public
         accountants  of the Trust for the fiscal year ending  October 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>  
         James Grosfeld ..........................  631,662              0              2,338
         James Clayburn La Force, Jr. ............  631,449              0              2,550
         Ratification of Deloitte &Touche LLP ....  619,495            5,704            8,801

</TABLE>


                                       11
<PAGE>


- --------------------------------------------------------------------------------
        THE BLACKROCK CALIFORNIA INVESTMENT QUALITY MUNICIPAL TRUST INC.
                               INVESTMENT SUMMARY
- --------------------------------------------------------------------------------

THE TRUST'S INVESTMENT OBJECTIVE

The  BlackRock  California   Investment  Quality  Municipal  Trust's  investment
objective  is to provide  high current  income  exempt from regular  Federal and
California income tax consistent with the preservation of capital.

WHO MANAGES THE TRUST?

BlackRock  Financial  Management,   Inc.   ("BlackRock")  is  an  SEC-registered
investment  adviser.  BlackRock and its  affiliates  currently  manage over $118
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 equity and bond funds.
Current  institutional  clients  number 334,  domiciled in the United States and
overseas.

WHAT CAN THE TRUST INVEST IN?

Under normal  conditions,  the Trust expects to continue to manage its assets so
that at least 80% of its investments are rated at least  investment grade ("BBB"
by Standard & Poor's and "Baa" by Moody's  Investor  Services)  and up to 20% of
its  assets  may  instead be deemed to be of  equivalent  credit  quality by the
Adviser.  The Trust  intends  to  invest  substantially  all of the  assets in a
portfolio of investment grade California  Municipal  Obligations,  which include
debt  obligations   issued  by  or  on  behalf  of  California,   its  political
subdivisions,  agencies and  instrumentalities  and by other qualifying  issuers
that pay interest  which,  in the opinion of the bond counsel of the issuer,  is
exempt from regular  Federal and  California  income tax.  California  Municipal
Obligations are issued to obtain funds for various public  functions,  including
the   construction  of  public   facilities,   the  refinancing  of  outstanding
obligations, the obtaining of funds for general operating expenses and for loans
to other public institutions and facilities.

WHAT IS THE ADVISER'S INVESTMENT STRATEGY?

The Adviser will manage the assets of the Trust in  accordance  with the Trust's
investment  objective and policies to seek to achieve its objective by investing
in investment  grade  California  Municipal  Obligations.  The Adviser  actively
manages the assets in relation to market  conditions  and interest rate changes.
Depending  on yield and  portfolio  allocation  considerations,  the Adviser may
choose  to invest a  portion  of the  Trust's  assets  in  securities  which pay
interest that is subject to AMT (alternative  minimum tax). The Trust intends to
emphasize   investments  in  California  Municipal  Obligations  with  long-term
maturities and expects to maintain an average portfolio maturity of 15-20 years,
but the  average  maturity  may be  shortened  or  lengthened  from time to time
depending on market conditions.

Under current market conditions the use of leverage  increases the income earned
by the Trust.  The Trust  employs  leverage  primarily  through the  issuance of
preferred  stock.   Preferred  stockholders  will  receive  dividends  based  on
short-term rates in exchange for allowing the Trust to borrow additional assets.
These assets will be invested in longer-term assets which typically offer higher
interest  rates and the  difference  between the cost of the  dividends  paid to
preferred  stockholders  and the interest earned on the  longer-term  securities
will provide higher income levels for common  stockholders in most interest rate
environments.  The Trust issued  preferred  stock to leverage  the  portfolio at
approximately  35% of total assets.  See "Leverage  Considerations in the Trust"
below.


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

The Trust's  shares are traded on the American  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 fund 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.


                                       12
<PAGE>

LEVERAGE CONSIDERATIONS IN THE TRUST

      Leverage  increases the duration (or price  sensitivity  of the net assets
with respect to changes in interest  rates) of the Trust,  which can improve the
performance  of the fund in a  declining  rate  environment,  but can  cause net
assets to decline  faster in a rapidly  rising  interest rate  environment.  The
Trust may reduce,  or unwind,  the amount of leverage  employed should BlackRock
consider that  reduction to be in the best  interests of the Trust.  BlackRock's
portfolio managers  continuously monitor and regularly review the Trust's use of
leverage  and  maintain  the  ability to unwind the  leverage  if that course is
chosen.

SPECIAL CONSIDERATIONS AND RISK FACTORS RELEVANT TO THE TRUST

The Trust is  intended  to be a  long-term  investment  and is not a  short-term
trading vehicle.

INVESTMENT  OBJECTIVE.  Although  the  objective of the Trust is to provide high
current income exempt from regular Federal and California  income tax consistent
with the preservation of capital,  there can be no assurance that this objective
will be achieved.

DIVIDEND  CONSIDERATIONS.  The income and dividends paid by the Trust are likely
to vary over time as fixed income market conditions change. Future dividends may
be higher or lower than the dividend the Trust is currently paying.

LEVERAGE.  The Trust utilizes leverage through  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 American Stock  Exchange  (AMEX symbol:  RAA) 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.

INVESTMENT GRADE MUNICIPAL  OBLIGATIONS.  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.

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. These securities involve 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.


                                       13
<PAGE>



- --------------------------------------------------------------------------------
        THE BLACKROCK CALIFORNIA INVESTMENT QUALITY MUNICIPAL 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  the  deduction  of
                        expenses.  This Trust  declares  and pays  dividends  to
                        common shareholders on a monthly basis.

Dividend Reinvestment:  Shareholders may have all dividends and distributions of
                        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 investments, minus any liabilities
                        including accrued expenses,  divided 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 New  York  Times  or The  Wall  Street
                        Journal each 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.

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


                                       14
<PAGE>

<TABLE>
<CAPTION>

- --------------------------------------------------------------------------------
                      BLACKROCK FINANCIAL MANAGEMENT, INC.
                           SUMMARY OF CLOSED-END FUNDS
- --------------------------------------------------------------------------------

TAXABLE TRUSTS
- ---------------------------------------------------------------------------------------------------------------------------

                                                                                             STOCK       MATURITY
PERPETUAL TRUSTS                                                                             SYMBOL        DATE
                                                                                             ------       ------
<S>                                                                                          <C>          <C>
The BlackRock Income Trust Inc.                                                               BKT           N/A
The BlackRock North American Government Income Trust Inc.                                     BNA           N/A

TERM TRUSTS
The BlackRock 1998 Term Trust Inc.                                                            BBT          12/98
The BlackRock 1999 Term Trust Inc.                                                            BNN          12/99
The BlackRock Target Term Trust Inc.                                                          BTT          12/00
The BlackRock 2001 Term Trust Inc.                                                            BLK          06/01
The BlackRock Strategic Term Trust Inc.                                                       BGT          12/02
The BlackRock Investment Quality Term Trust Inc.                                              BQT          12/04
The BlackRock Advantage Term Trust Inc.                                                       BAT          12/05
The BlackRock Broad Investment Grade 2009 Term Trust Inc.                                     BCT          12/09
</TABLE>

<TABLE>
<CAPTION>

TAX-EXEMPT TRUSTS
- ---------------------------------------------------------------------------------------------------------------------------


                                                                                             STOCK       MATURITY
PERPETUAL TRUSTS                                                                             SYMBOL        DATE
                                                                                             ------       ------
<S>                                                                                          <C>          <C>
The BlackRock Investment Quality Municipal Trust Inc.                                         BKN           N/A
The BlackRock California Investment Quality Municipal Trust Inc.                              RAA           N/A
The BlackRock Florida Investment Quality Municipal Trust Inc.                                 RFA           N/A
The BlackRock New Jersey Investment Quality Municipal Trust Inc.                              RNJ           N/A
The BlackRock New York Investment Quality Municipal Trust Inc.                                RNY           N/A

TERM TRUSTS
The BlackRock Municipal Target Term Trust Inc.                                                BMN          12/06
The BlackRock Insured Municipal 2008 Term Trust Inc.                                          BRM          12/08
The BlackRock California Insured Municipal 2008 Term Trust Inc.                               BFC          12/08
The BlackRock Florida Insured Municipal 2008 Term Trust Inc.                                  BRF          12/08
The BlackRock New York Insured Municipal 2008 Term Trust Inc.                                 BLN          12/08
The BlackRock Insured Municipal Term Trust Inc.                                               BMT          12/10
</TABLE>


      IF YOU WOULD LIKE FURTHER INFORMATION PLEASE CALL BLACKROCK AT (800)
             227-7BFM (7236) OR CONSULT WITH YOUR FINANCIAL ADVISOR.


                                       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
Prudential Investments Fund Management LLC
Gateway Center Three
100 Mulberry Street
Newark, NJ 07102-4077

CUSTODIAN AND TRANSFER AGENT
State Street Bank and Trust Company
One Heritage Drive
North  Quincy,  MA 02171
(800)  699-1BFM

AUCTION AGENT 
Bankers Trust Company
4 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 April 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 INVESTMENT
                          QUALITY MUNICIPAL TRUST INC.
                 c/o Prudential Investments Fund Management LLC
                              Gateway Center Three
                               100 Mulberry Street
                              Newark, NJ 07102-4077
                                 (800) 227-7BFM


[LOGO]Printed on recycled paper                                      09247U-10-7
                                                                     09247U-20-6


THE BLACKROCK
CALIFORNIA
INVESTMENT QUALITY
MUNICIPAL TRUST INC.
====================
SEMI-ANNUAL REPORT
APRIL 30, 1998


[GRAPHIC]



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