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, 2007
Date of reporting period:    January 31, 2007


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)
JANUARY 31, 2007
BlackRock California Investment Quality Municipal Trust (RAA)
(Percentage of Net Assets)

      Principal                  
    Amount       Option Call      
Rating1   (000)   Description   Provisions2     Value
        LONG-TERM INVESTMENTS—143.1%          
        California—125.9%          
        California,          
A+   $      700      Ad Valorem Ppty. Tax GO, 4.75%, 3/01/34   03/16 @ 100   $ 709,772
A+   40      Pub. Impvts. Misc. GO, 5.75%, 3/01/19   09/07 @ 100     40,052
AAA   625   California St. Univ., Coll. & Univ. RB, Ser. C, 5.00%, 11/01/38, MBIA   11/15 @ 100     659,381
AA   500   Carson Pub. Fing. Auth., Pub. Impvts. SA, Ser. A, 5.00%, 9/02/31, RAA   03/17 @ 100     518,840
AAA   500   Chabot-Las Positas Cmnty. Coll. Dist., Univ. & Coll. Impvts. Ad Valorem Ppty. Tax GO,          
           5.00%, 8/01/31, AMBAC   08/16 @ 100     530,265
        City of Chula Vista, Indl. Dev. RB,          
A+   275      5.00%, 12/01/27, AMT   12/15 @ 102     288,838
A+   320      San Diego Gas & Elec. Proj., 5.00%, 12/01/27, AMT   12/15 @ 102     336,103
NR   1,000   Cnty. of San Bernardino, Pub. Impvts. ST, 5.90%, 9/01/33   09/12 @ 102     1,061,360
Aa2   500   Dept. of Veterans Affairs, St. Hsg. RB, Ser. A-3, 4.60%, 12/01/28   11/11 @ 101     497,110
AAA   75   Edl. Facs. Auth., Student Loans RB, Ser. A, 6.00%, 3/01/16, MBIA, AMT   03/07 @ 100     76,598
        Golden St. Tobacco Sec. Corp., Misc. Purps. Tobacco Settlement Funded RB,          
AAA   600 3     Ser. B, 5.50%, 6/01/13   N/A     656,304
AAA   400 3     Ser. B, 5.625%, 6/01/13   N/A     440,324
A3   1,040   Hlth. Facs. Fing. Auth., Hlth., Hosp. & Nursing Home RB, Cedars Sinai Med. Ctr. Proj.,          
           5.00%, 11/15/34   11/15 @ 100     1,072,760
AAA   500   Infrastructure & Econ. Dev. Bank, Misc. RB, Salvation Army Proj., 5.00%, 9/01/27,          
           AMBAC   09/16 @ 100     529,655
AAA   500   Las Virgenes Unified Sch. Dist., Sch. Impvts. Ad Valorem Ppty. Tax RB, Ser. A, 5.00%,          
           8/01/28, FSA   08/16 @ 100     531,070
AAA   1,000   Los Angeles Cnty. Cmnty. Facs. Dist. No. 3 ST, Ser. A, 5.50%, 9/01/14, FSA   09/07 @ 102     1,030,070
AAA   510   Los Angeles Dept. of Arpts., Port, Arpt. & Marina RB, Ontario Intl. Proj., Ser. A, 5.00%,          
           5/15/26, MBIA, AMT   05/16 @ 100     532,302
AAA   500   Los Angeles Dept. of Wtr. & Pwr., Elec., Pwr. & Lt. RB, 5.00%, 7/01/35, FSA   07/15 @ 100     527,370
B   945   Los Angeles Regl. Arpts. Impvt. Corp., Port, Arpt. & Marina RB, American Airlines, Inc.          
           Proj., Ser. B, 7.50%, 12/01/24, AMT   12/12 @ 102     1,088,772
AAA   500   Los Angeles Unified Sch. Dist., Ad Valorem Ppty. Tax GO, Ser. B, 4.75%, 1/01/27, FGIC   07/16 @ 100     516,470
AAA   700   Palm Springs Unified Sch. Dist., Sch. Impvts. Ad Valorem Ppty. Tax GO, Election 2004,          
           Ser. A, 4.50%, 8/01/35, FSA   08/14 @ 102     700,000
NR   1,000   Poway Unified Sch. Dist., Pub. Impvts. ST, Cmnty. Facs. Dist. No. 6 Proj., 5.60%, 9/01/33   09/10 @ 102     1,031,190
A   500   Pub. Wks. Brd., Correctional Fac. Impvts. Lease Abatement RB, Dept. Corrections Rehab.          
           Proj., Ser. H, 5.00%, 11/01/31   11/16 @ 100     523,140
Aaa   500   Rural Home Mtg. Fin. Auth., Local Sngl. Fam. Hsg. RB, 5.40%, 12/01/36, AMT   06/16 @ 104     528,850
AAA   40   Southern California Pub. Pwr. Auth., Elec., Pwr. & Lt. RB, 5.50%, 7/01/20, MBIA   03/07 @ 100     40,056
        Statewide Cmntys. Dev. Auth., Hlth., Hosp. & Nursing Home RB,          
A+   500      Kaiser Hosp. Asset Mgt. Proj., 5.25%, 8/01/31   08/16 @ 100     529,125
A+   500      Kaiser Permanente Proj., Ser. A, 5.00%, 4/01/31   04/17 @ 100     518,120
AAA   500 3  Temecula Valley Unified Sch. Dist., Sch. Impvts. Ad Valorem Ppty. Tax GO, Ser. G,          
           5.75%, 8/01/07, FGIC   N/A     515,280
AAA   900 3  Tobacco Sec. Auth. of Southern California, Misc. Purps. Tobacco Settlement Funded RB,          
           Ser. A, 5.625%, 6/01/12   N/A     980,838
AAA   750   Tustin Unified Sch. Dist., Sch. Impvts. Ad Valorem Ppty. Tax ST, Cmnty. Facs. Dist. 97-1-          
           A Proj., 5.00%, 9/01/32, FSA   09/12 @ 100     776,918
AAA   370   West Basin Mun. Wtr. Dist., Lease Non-Terminable COP, Ser. A, 5.50%, 8/01/22,          
           AMBAC   08/07 @ 101     376,571
                  18,163,504
        Puerto Rico—17.2%          
BBB   500   Comnwlth., Pub. Impvts. Ad Valorem Ppty. Tax GO, Ser. A, 5.00%, 7/01/34   07/14 @ 100     517,510
A3   325   Elec. Pwr. Auth., Elec., Pwr. & Lt. Impvts. RB, Ser. NN, 5.125%, 7/01/29   07/13 @ 100     339,329
AAA   85   Hwy. & Transp. Auth., Hwy. Tolls RB, Ser. L, 5.25%, 7/01/38, AMBAC   No Opt. Call     99,496
BBB-   700   Indl. Tourist Edl. Med. & Env. Ctrl. Facs. Fing. Auth., Univ. & Coll. Impvts. RB, Ana G.          
           Mendez Univ. Sys. Proj., 5.00%, 3/01/26   03/16 @ 100     726,894

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BlackRock California Investment Quality Municipal Trust (RAA) (continued)
(Percentage of Net Assets)

      Principal                  
    Amount       Option Call      
Rating1   (000)   Description   Provisions2     Value
        Puerto Rico—(cont'd)          
Aaa   $      745 3  Pub. Fin. Corp., Cash Flow Mgmt. Misc. RB, Ser. E, 5.50%, 2/01/12   N/A   $ 803,237
                  2,486,466
        Total Long-Term Investments (cost $19,701,729)         20,649,970
    Shares              
     (000)              
        MONEY MARKET FUNDS—7.3%          
NR   700   AIM Tax Free Cash Reserve Portfolio - Institutional Class   N/A     700,000
NR   350   SSgA Tax Free Money Mkt. Fund - Class A   N/A     350,000
        Total Short-Term Investments (cost $1,050,000)         1,050,000
        Total Investments —150.4% (cost $20,751,7294)       $ 21,699,970
        Other assets in excess of liabilities —1.6%         231,133
        Preferred shares at redemption value, including dividends payable —(52.0)%         (7,504,891)
        Net Assets Applicable to Common Shareholders—100%       $ 14,426,212

 
1     

Using the highest of Standard & Poor's, Moody's Investors Service or Fitch's 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 prerefunded. 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     

Cost for federal income tax purposes is $20,745,538. The net unrealized appreciation on a tax basis is $954,432, consisting of $996,476 gross unrealized appreciation and $42,044 gross unrealized depreciation.

 
KEY TO ABBREVIATIONS
AMBAC  — American Municipal Bond Assurance Corp.   MBIA — Municipal Bond Insurance Assoc.
AMT — Subject to Alternative Minimum Tax   RAA — Radian Asset Assurance
COP — Certificate of Participation   RB — Revenue Bond
FGIC — Financial Guaranty Insurance Co.   SA — Special Assessment
FSA — Financial Security Assurance   ST — Special Tax
GO — General Obligation      

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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 its principal executive and principal 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.

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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/ Donald C. Burke                                       
Name: Donald C. Burke
Title: Treasurer and Principal Financial Officer
Date: March 28, 2007

          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: President and Principal Executive Officer
Date: March 28, 2007

By: /s/ Donald C. Burke                                       
Name: Donald C. Burke
Title: Treasurer and Principal Financial Officer
Date: March 28, 2007

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