UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM N-Q

QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED
MANAGEMENT INVESTMENT COMPANY

Investment Company Act file number:      811-07664                    

          BlackRock California Investment Quality Municipal Trust, Inc.          
(Exact name of registrant as specified in charter)

100 Bellevue Parkway, Wilmington, DE  19809 
(Address of principal executive offices)  (Zip code) 

Robert S. Kapito, President

BlackRock California Investment Quality Municipal Trust, Inc.

                                                  40 East 52nd Street, New York, NY 10022                                             
(Name and address of agent for service)

Registrant's telephone number, including area code:      888-825-2257                    

Date of fiscal year end:      October 31, 2005                         

Date of reporting period:      July 31, 2005                         

Item 1. Schedule of Investments.

The Registrant’s unaudited schedule of investments as of the close of the reporting period pursuant to Rule 30b1-5 under the Investment Company Act of 1940 is as follows:

 

PORTFOLIO OF INVESTMENTS (unaudited)
JULY 31, 2005

BlackRock California Investment Quality Municipal Trust (RAA)

  Principal        
    Amount     Option Call  
Rating1   (000)   Description Provisions2   Value
      LONG-TERM INVESTMENTS—115.7%    
        California—104.6%    
A   $        40   California, GO, 5.75%, 3/01/19 09/05 @ 101   $        40,488
        Edl. Facs. Auth., MBIA,    
AAA   760 3     Santa Clara Univ., 5.00%, 9/01/06 N/A   793,866
AAA   240       Student Loan Prog., Ser. A, 6.00%, 3/01/16 03/07 @ 102   251,316
        Golden St. Tobacco Sec. Corp., Ser. B,    
A-   600       5.50%, 6/01/43 06/13 @ 100   665,148
A-   400       5.625%, 6/01/38 06/13 @ 100   448,216
A-   1,040   Golden St. Tobacco Sec. Corp. Tobacco Settlement Rev., Ser. A, 5.00%, 6/01/45 06/15 @ 100   1,067,913
A3   1,040   Hlth. Fac. Fin. Auth. Rev., Cedars Sinai Med Center Proj., 5.00%, 11/15/34 11/15 @ 100   1,066,801
        Los Angeles Cnty.,    
AAA   1,000       Cmnty. Facs. Spec. Tax, Ser. A, 5.50%, 9/01/14, FSA 09/07 @ 102   1,066,880
AAA   1,000 3     Met. Trans. Auth. Sales Tax Rev., 6.00%, 7/01/06, MBIA N/A   1,039,970
AA   1,150   Los Angeles Harbor Dept., Ser. B, 6.00%, 8/01/13 08/06 @ 101   1,193,217
B-   945   Los Angeles Regl. Arpt. Impvt., Corp. Lease Rev., Amer. Airlines, Inc. Proj., Ser. B,    
            7.50%, 12/01/24 12/12 @ 102   1,009,884
NR   1,000   Poway Unified Sch. Dist., Spl. Tax Rev., Cmnty. Facs. Dist. No. 6 Proj., 5.60%, 9/01/33 09/10 @ 102   1,008,140
A2   1,000   Pub. Wks. Brd., Lease Rev., St. Univ. Proj., Ser. A, 6.10%, 10/01/06 08/05 @ 102   1,015,900
BBB+   1,000 3 Sacramento Pwr. Auth. Rev., Cogeneration Proj., 6.50%, 7/01/06 N/A   1,054,210
NR   1,000   San Bernardino Cnty., Spl. Tax Rev., Cmnty. Facs., 5.90%, 9/01/33 09/12 @ 102   1,008,330
AAA   500   San Diego Ind. Dev., Ser. A, 5.90%, 6/01/18, AMBAC 08/05 @ 100   505,735
AAA   150   San Francisco City & Cnty. Arpt. Comm., Intl. Arpt. Rev., Ser. 12-A, 5.90%, 5/01/26, MBIA    05/06 @ 101   154,603
AAA   40   So. California Pub. Pwr. Auth., Transm. Proj. Rev., 5.50%, 7/01/20, MBIA 08/05 @ 100   40,115
AAA   500   Temecula Valley Unified Sch. Dist., GO, Ser. G, 5.75%, 8/01/25, FGIC 08/07 @ 102   535,140
BBB   900   Tobacco Sec. Auth. So. California, Tobacco Settlement Rev., Ser. A, 5.625%, 6/01/43 06/12 @ 100   940,005
AAA   370   West Basin Mun. Wtr. Dist., COP, Ser. A, 5.50%, 8/01/22, AMBAC 08/07 @ 101   391,116
              15,296,993
        Puerto Rico—11.1%    
        Pub. Fin. Corp., Ser. E,    
Aaa   745 3     5.50%, 2/01/12 N/A   829,513
BBB-   255 4     5.50%, 8/01/29 02/12 @ 100   276,688
BBB   500   Public Impvt., Ser. A, 5.00%, 7/01/34 07/14 @ 100   517,425
              1,623,626
        Total Long-Term Investments (cost $15,910,854)     16,920,619
        SHORT-TERM INVESTMENTS—45.5%    
        California—41.4%    
A1+   600 5 Dept. of Wtr. Res., Pwr. Sply. Rev., Ser. B-2, 2.18%, 8/01/05, FRDD N/A   600,000
A-1   600 5 Hlth. Fac. Fin. Auth., Ser. B, 2.14%, 8/01/05, AMBAC, FRDD N/A   600,000
VMIG1   600 5 Irvine Unified Sch. Dist. Spec. Tax, 2.14%, 8/01/05, FRDD N/A   600,000
VMIG1   318 5 Irvine Impvt. Bond Act 1915, Spec. Assmt. Dist. 00-18, Ser. A, 2.14%, 8/01/05, FRDD N/A   318,000
A1+   700 5 Met. Wtr. Dist., So. California Wtr. Wks., Ser. C-2, 2.14%, 8/01/05, FRDD N/A   700,000
A1+   700 5 Newport Beach Rev., Hoag Mem. Presbyterian Hosp. Proj., 2.09%, 8/01/05, FRDD N/A   700,000
A1+   600 5 Orange Cnty. Sanitation Dist., COP, Ser. B, 2.14%, 8/01/05, FRDD N/A   600,000
A1+   700 5 St. Econ. Recovery, Ser. C-5, 2.09%, 8/01/05, FRDD N/A   700,000
A1+   700 5 Statewide Cmnty. Dev. Auth. Rev., John Muir/Mt. Diablo Hlth. Proj., 2.05%,    
            8/01/05, AMBAC, FRDD N/A   700,000
A1+   535 5 St. GO, Daily Kindergarten Univ. Proj., Ser. A 4, 2.08%, 8/01/05, FRDD N/A   535,000
              6,053,000

1

BlackRock California Investment Quality Municipal Trust (RAA) (continued)

  Principal        
    Amount        
Rating1   (000)   Description     Value
      Puerto Rico—4.1%    
A-1   $      600 5 Hwy. & Transp. Auth. Transp. Rev., Ser. A, 2.26%, 8/03/05, AMBAC, FRWD        $      600,000
        Total Short-Term Investments (cost $6,653,000)     6,653,000
        Total Investments—161.2% (cost $22,563,8546)     23,573,619
        Liabilities in excess of other assets (including $2,136,687 of investment purchase    
            payable)—(9.9)%     (1,444,653)
        Preferred stock at redemption value, including dividends payable—(51.3)%     (7,501,439)
        Net Assets Applicable to Common Shareholders—100%     $14,627,527
 

1   Using the higher of Standard & Poor’s, Moody’s Investor Service or Fitch Ratings.  
2   Date (month/year) and price of the earliest optional call or redemption. There may be other call provisions at varying prices at later dates.  
3   This bond is prefunded. U.S. government securities, held in escrow, are used to pay interest on this security, as well as retire the bond in full at the date indicated, typically at a premium to par.  
4   Security, or a portion thereof, pledged as collateral with a value of $283,700 on 3 short U.S. Treasury Note futures contracts expiring September 2005. The value of such contracts on July 31, 2005 was $332,953, with an unrealized gain of $955.  
5   For purposes of amortized cost valuation, the maturity date of this instrument 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.  
6   Cost for Federal income tax purposes is $22,564,968. The net unrealized appreciation on a tax basis is $1,008,651, consisting of $1,008,651 gross unrealized appreciation and $0 gross unrealized depreciation. 

KEY TO ABBREVIATIONS

AMBAC —   American Municipal Bond Assurance Corp.   FRWD —   Floating Rate Weekly Demand  
COP —   Certificate of Participation   FSA —   Financial Security Assurance  
FGIC —   Financial Guaranty Insurance Co.   GO —   General Obligation  
FRDD —   Floating Rate Daily Demand   MBIA —   Municipal Bond Insurance Assoc.  


2

Item 2. Controls and Procedures.

(a) The Registrant's principal executive and principal financial officers have evaluated the Registrant's disclosure controls and procedures within 90 days of this filing and have concluded, as of that date, that the Registrant’s disclosure controls and procedures were reasonably designed to ensure that information required to be disclosed by the Registrant in this Form N-Q was recorded, processed, summarized, and reported within the required time periods and that information to be disclosed by the Registrant in this Form N-Q was accumulated and communicated to the Registrant’s management , including it principle executive and principle financial officers, as appropriate to allow timely decisions regarding required disclosure.

(b) There were no changes in the Registrant's internal control over financial reporting (as defined in Rule 30a-3(d) under the 1940 Act (17 CFR 270.30a -3(d)) that occurred during the registrant's last fiscal quarter that have materially affected, or are reasonably likely to materially affect, the Registrant's internal control over financial reporting.

Item 3. Exhibits.

Separate certifications of the registrant’s principal executive and financial officers pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 are attached as EX-99.CERT.

SIGNATURES

     Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

(Registrant)          BlackRock California Investment Quality Municipal Trust, Inc.                                        

By: /s/ Henry Gabbay                                                  
Name: Henry Gabbay
Title: Treasurer
Date: September 28, 2005

     Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the Registrant and in the capacities and on the dates indicated.

By: /s/ Robert S. Kapito                                                  
Name: Robert S. Kapito
Title: Principal Executive Officer
Date: September 28, 2005

By: /s/ Henry Gabbay                                                  
Name: Henry Gabbay
Title: Principal Financial Officer
Date: September 28, 2005