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:__811-07090______

_______BlackRock California Insured Municipal 2008 Term 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 Insured Municipal 2008 Term 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:___December 31, 2006
Date of reporting period:__March 31, 2006

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
MARCH 31, 2006
(unaudited)

BlackRock California Insured Municipal 2008 Term Trust (BFC)

  Principal          
    Amount     Option Call    
Rating1   (000)   Description Provisions2   Value

 
      LONG-TERM INVESTMENTS—155.8%      
        California—143.4%      
AAA   $ 2,635   Alameda Cnty. COP, Ser. A, 3.80%, 12/01/08, MBIA No Opt. Call   $ 2,656,133  
        Anaheim Union High Sch. Dist. GO,      
AAA   1,060         Ser. A, 3.50%, 8/01/08, FSA No Opt. Call   1,060,435  
AAA   1,250         Ser. A, 4.00%, 8/01/09, FSA No Opt. Call   1,268,613  
AAA   1,000   Burbank Elec. RB, 3.50%, 6/01/09, MBIA No Opt. Call   999,670  
        California GO,      
AAA   2,000         5.00%, 6/01/09, MBIA No Opt. Call   2,085,160  
AAA   3,000         5.50%, 4/01/09, MBIA No Opt. Call   3,163,620  
AAA   3,000         5.50%, 2/01/10, MBIA No Opt. Call   3,202,800  
AAA   2,000         6.25%, 9/01/08, FGIC No Opt. Call   2,121,960  
AAA   15,000         6.30%, 9/01/08, MBIA No Opt. Call   15,931,800  
AAA   2,600   Castaic Lake Wtr. Agcy. COP, Wtr. Sys. Impvt. Proj., Ser. A, 7.25%, 8/01/10, MBIA No Opt. Call   2,969,824  
AAA   1,135   Chaffey Cmnty. Coll. Dist. GO, Ser. A, 3.75%, 7/01/09, FSA No Opt. Call   1,142,877  
        Chula Vista COP,      
AAA   1,000         Police Fac. Proj., 4.00%, 8/01/08, MBIA No Opt. Call   1,011,470  
AAA   1,000         Police Fac. Proj., 4.00%, 8/01/09, MBIA No Opt. Call   1,014,890  
AAA   5,500 3   Clovis Unified Sch. Dist. GO, Ser. B, Zero Coupon, 8/01/08, FGIC ETM   5,060,330  
        Dept. of Wtr. Res. Pwr. Sply. RB,      
AAA   10,000         Ser. A, 3.125%, 5/01/08, FSA No Opt. Call   9,888,000  
AAA   10,000         Ser. A, 3.375%, 5/01/09, MBIA No Opt. Call   9,932,100  
AAA   1,000   Dept. of Wtr. Res. Wtr. RB, Central Valley Proj., Ser. Z, 4.00%, 12/01/09, FGIC No Opt. Call   1,016,290  
AAA   1,855   El Paso de Robles GO, Ser. A, Zero Coupon, 8/01/09, FGIC No Opt. Call   1,640,673  
AAA   4,025   Elsinore Valley Mun. Wtr. Dist. COP, Ser. A, 6.00%, 7/01/09, FGIC No Opt. Call   4,315,041  
AAA   1,055   Glendale Unified Sch. Dist. GO, Ser. D, 3.50%, 9/01/09, MBIA No Opt. Call   1,054,304  
AAA   2,000   Hlth. Facs. Fin. Auth. RB, Sutter Hlth. Care Sys. Proj., 5.70%, 8/15/09, MBIA 08/06 @ 102   2,054,920  
        Long Beach Bd. of Fin. Auth. TA, Redev. Proj.,      
AAA   1,245         3.50%, 8/01/08, AMBAC No Opt. Call   1,242,759  
AAA   1,120         3.75%, 8/01/09, AMBAC No Opt. Call   1,124,480  
AAA   4,405   Los Angeles Cnty. Met. Trans. Auth. RB, Spl. Benefit Assmt. Dist A1 Proj., 3.75%, 9/01/08,      
              AMBAC No Opt. Call   4,432,091  
AAA   9,835   Los Angeles Cnty. Sanitation Dists. Fin. Auth. RB, Ser. A, 4.00%, 10/01/09, FSA No Opt. Call   9,988,721  
        Los Angeles Cnty. Asset Leasing Corp. RB,      
AAA   2,910         5.95%, 12/01/07, AMBAC No Opt. Call   3,021,657  
AAA   8,090         6.00%, 12/01/08, AMBAC No Opt. Call   8,591,823  
AAA   8,600         6.05%, 12/01/09, AMBAC No Opt. Call   9,324,378  
AAA   6,000   Los Angeles Dept. of Arpts. RB, LA Intl. Arpt. Proj., Ser. B, 5.00%, 5/15/09, MBIA No Opt. Call   6,252,120  
AAA   13,110   Los Angeles GO, Ser. A, 3.50%, 9/01/09, MBIA No Opt. Call   13,101,347  
AAA   3,860   Los Angeles Sanitation Equip. RB, Ser. A, 3.625%, 2/01/09, FSA No Opt. Call   3,871,696  
        Los Angeles Unified Sch. Dist.      
AAA   2,660 3         COP, Ser. B, 3.00%, 10/01/08, FSA ETM   2,616,429  
AAA   7,500         GO, Ser. F, 3.00%, 7/01/09, FSA No Opt. Call   7,321,050  
AAA   1,000   Mount Diablo Unified Sch. Dist. GO, 3.50%, 8/01/08, FSA No Opt. Call   1,000,410  
AAA   1,000   Orange Cnty. Local Trans. Auth. Sales Tax RB, 6.00%, 2/15/09, MBIA No Opt. Call   1,065,770  
AAA   2,495 3   Pasadena Unified Sch. Dist. GO, Ser. C, 3.50%, 11/01/08, FSA ETM   2,496,771  
AAA   2,100   Pub. Wks. Brd. RB, Energy Efficiency Proj., Ser. A, 5.625%, 10/01/08, AMBAC 05/06 @ 102   2,144,163  
AAA   3,345 3   Sacramento City Fin. Auth. RB, City Hall & Redev. Projs., Ser. A, 3.50%, 12/01/08, FSA ETM   3,347,408  
AAA   1,000   Sacramento City Unified Sch. Dist. GO, 3.50%, 7/01/09, FGIC No Opt. Call   999,350  
        Sacramento Mun. Util. Dist. Elec. RB,      
AAA   825 3         Ser. C, 5.75%, 11/15/07, MBIA ETM   826,287  
AAA   3,750 3         Ser. C, 5.75%, 11/15/08, FGIC ETM   3,755,850  
AAA   3,950 3         Ser. C, 5.75%, 11/15/09, MBIA ETM   3,956,162  
AAA   5,000 3   San Bernardino Cnty. Trans. Auth. Sales Tax RB, 6.00%, 3/01/10, FGIC ETM   5,250,250  
        San Diego Cnty. COP,      
AAA   2,360         5.00%, 2/01/09, AMBAC No Opt. Call   2,450,364  
AAA   11,000         5.625%, 9/01/12, AMBAC No Opt. Call   11,759,440  
        San Diego Cnty. Regl. Trans. Comm. Sales Tax RB,      
AAA   7,830 3         Ser. A, 6.00%, 4/01/08, MBIA ETM   8,095,515  
AAA   2,500 3         Ser. A, 6.00%, 4/01/08, FGIC ETM   2,584,775  
AAA   12,725   San Diego Pub. Facs. Fin. Auth. Wtr. RB, 3.00%, 8/01/09, MBIA No Opt. Call   12,425,835  
AAA   1,250   San Francisco City & Cnty. GO, 4.00%, 6/15/09, FSA No Opt. Call   1,270,200  
AAA   1,000 3   San Jose Redev. Agcy. TA, 4.00%, 8/01/09, MBIA ETM   1,013,950  
AAA   1,000   San Mateo Cnty. Cmnty. Coll. Dist. GO, Ser. A, 3.30%, 9/01/08, FGIC No Opt. Call   995,860  
        Santa Ana Unified Sch. Dist. GO,      
AAA   1,000         Ser. B, Zero Coupon, 8/01/08, FGIC No Opt. Call   919,220  
AAA   2,000         Ser. B, Zero Coupon, 8/01/09, FGIC No Opt. Call   1,768,920

1


BlackRock California Insured Municipal 2008 Term Trust (BFC) (continued)


  Principal          
    Amount     Option Call    
Rating1   (000)   Description Provisions2   Value

 
      California—(cont’d)      
AAA   $ 4,030   Santa Barbara Cnty. Local Transp. Auth. Sales Tax RB, 3.00%, 3/15/09, FSA No Opt. Call   $      3,946,660  
AAA   2,470   Santa Clara COP, Ser. B, 3.50%, 2/01/09, AMBAC No Opt. Call   2,469,259  
AAA   4,620   Santa Clara Valley Wtr. Dist. COP, 4.00%, 2/01/09, FGIC No Opt. Call   4,680,152  
AAA   4,665   So. Coast Air Qual. Mgmt. Dist. Bldg. Corp. RB, 4.00%, 8/01/09, AMBAC No Opt. Call   4,734,462  
        Univ. of California RB,      
AAA   2,500         Ser. A, 5.00%, 5/15/09, AMBAC No Opt. Call   2,608,800  
AAA   2,000 4         Ser. F, 5.00%, 9/01/06, FGIC N/A   2,032,800  

              233,078,094  

        Puerto Rico—12.4%      
        Elec. Pwr. Auth. RB,      
AAA   5,280         Ser. DD, 5.00%, 7/01/09, FSA 07/08 @ 101.5   5,493,946  
AAA   7,000         Ser. DD, 5.00%, 7/01/10, FSA 07/08 @ 101.5   7,291,690  
AAA   3,000         Ser. KK, 4.50%, 7/01/09, XLCA No Opt. Call   3,071,550  
AAA   4,000   Mun. Fin. Agcy. GO, Ser. A, 5.625%, 8/01/10, FSA 08/09 @ 101   4,288,120  

              20,145,306  

        Total Long-Term Investments (cost $248,857,752)     253,223,400  

        SHORT-TERM INVESTMENTS—7.0%      
        California—6.5%      
A-1+   5,000 5   Dept. of Wtr. Res. Pwr. Sply. RB, Ser. B-2, 3.07%, 4/03/06, FRDD N/A   5,000,000  
A-1+   1,500 5   Orange Cnty. Sanitation Dist. COP, Ser. A, 3.10%, 4/03/06, FRDD N/A   1,500,000  
A-1+   4,100 5   Vacaville Multi-Fam. Mtg. RB, Quail Run Proj., Ser. A, 3.09%, 4/05/06, FRWD N/A   4,100,000  

              10,600,000  

    Shares          
    (000)          

        Money Market Funds—0.5%      
NR   850   AIM Tax Free Investment Co. Cash Reserve Porfolio N/A   850,000  

        Total Short-Term Investments (cost $11,450,000)     11,450,000  

        Total Investments—162.8% (cost $260,307,7526)     $264,673,400  
        Other assets in excess of liabilities—1.5%     2,474,577  
        Preferred shares at redemption value, including dividends payable—(64.3)%     (104,567,950)  

        Net Assets Applicable to Common Shareholders—100%     $162,580,027  

 


1   Using the higher 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  Security is collateralized by U.S. Treasury obligations.  
4  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.  
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. Rate shown is rate as of March 31, 2006.  
6  Cost for Federal income tax purposes is $259,578,194. The net unrealized appreciation on a tax basis is $5,095,206, consisting of $6,617,222 gross unrealized appreciation and $1,522,016 gross unrealized depreciation.  
 
    The value (market value plus accrued interest) of securities that are covered by insurance, which ensures the payment of principal and interest, represent approximately 96.0% of the Trust’s managed assets. 

AMBAC 20.4%
FGIC 14.0%
FSA 25.1%
MBIA 35.1%
XLCA   1.1%
Other   0.3%

KEY TO ABBREVIATIONS

AMBAC   American Municipal Bond Assurance Corp. FSA   Financial Security Assurance
COP   Certificate of Participation GO   General Obligation
ETM   Escrowed to Maturity MBIA   Municipal Bond Insurance Assoc.
FGIC   Financial Guaranty Insurance Co. RB   Revenue Bond
FRDD   Floating Rate Daily Demand TA   Tax Allocation
FRWD   Floating Rate Weekly Demand XLCA   XL Capital Assurance

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 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.


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 Insured Municipal 2008 Term Trust, Inc.___

By:___/s/ Henry Gabbay____________________________________
Name: Henry Gabbay
Title: Treasurer and Principal Financial Officer
Date: May 25, 2006

          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: May 25, 2006

By:__/s/ Henry Gabbay______________________________________
Name: Henry Gabbay
Title: Treasurer and Principal Financial Officer
Date: May 25, 2006