Form N-Q

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, DC 20549

FORM N-Q


QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED MANAGEMENT INVESTMENT COMPANY

Investment Company Act file number         811-09449         

        Nuveen Insured California Dividend Advantage Municipal Fund         
(Exact name of registrant as specified in charter)


        333 West Wacker Drive, Chicago, Illinois 60606         
(Address of principal executive offices) (Zip code)


Jessica R. Droeger—Vice President and Secretary
        333 West Wacker Drive, Chicago, Illinois 60606         
(Name and address of agent for service)

Registrant's telephone number, including area code:         312-917-7700        

Date of fiscal year end:            08/31          

Date of reporting period:          05/31/05         

Form N-Q is to be used by management investment companies, other than small business investment companies registered on Form N-5 (§§ 239.24 and 274.5 of this chapter), to file reports with the Commission, not later than 60 days after the close of the first and third fiscal quarters, pursuant to rule 30b1-5 under the Investment Company Act of 1940 (17 CFR 270.30b1-5). The Commission may use the information provided on Form N-Q in its regulatory, disclosure review, inspection, and policymaking roles.

A registrant is required to disclose the information specified by Form N-Q, and the Commission will make this information public. A registrant is not required to respond to the collection of information contained in Form N-Q unless the Form displays a currently valid Office of Management and Budget (“OMB”) control number. Please direct comments concerning the accuracy of the information collection burden estimate and any suggestions for reducing the burden to the Secretary, Securities and Exchange Commission, 450 Fifth Street, NW, Washington, DC 20549-0609. The OMB has reviewed this collection of information under the clearance requirements of 44 U.S.C. § 3507.

Item 1. Schedule of Investments

                   Portfolio of Investments (Unaudited)             
    Nuveen Insured California Dividend Advantage Municipal Fund (NKL)             
                   May 31, 2005             
 
 
 
Principal        Optional Call        Market 
Amount (000)    Description(1)    Provisions*    Ratings**    Value 
 
    Consumer Staples - 2.2% (1.5% of Total Investments)             
$ 4,500    Golden State Tobacco Securitization Corporation, California, Tobacco Settlement Asset-Backed    6/13 at 100.00    BBB    $ 5,298,255 
    Revenue Bonds, Series 2003A-2, 7.900%, 6/01/42             
 
    Education and Civic Organizations - 9.1% (6.1% of Total Investments)             
1,675    California Educational Facilities Authority, Revenue Bonds, University of San Diego, Series 2002A,    10/12 at 100.00    A2    1,770,308 
    5.250%, 10/01/30             
9,000    California State University, Systemwide Revenue Bonds, Series 2002A, 5.125%, 11/01/26 - AMBAC    11/12 at 100.00    AAA    9,605,250 
    Insured             
1,000    California Statewide Community Development Authority, Student Housing Revenue Bonds, EAH - Irvine    8/12 at 100.00    A    1,061,870 
    East Campus Apartments, LLC Project, Series 2002A, 5.500%, 8/01/22 - ACA Insured             
9,000    University of California, Revenue Bonds, Multiple Purpose Projects, Series 2000K, 5.300%, 9/01/30    9/08 at 101.00    AA    9,381,690 
 
    Healthcare - 8.0% (5.4% of Total Investments)             
5,000    ABAG Finance Authority for Non-Profit Corporations, California, Insured Revenue Bonds, Sansum-Santa    4/12 at 100.00    A    5,401,000 
    Barbara Medical Foundation Clinic, Series 2002A, 5.600%, 4/01/26             
    California Health Facilities Financing Authority, Revenue Bonds, Cedars-Sinai Medical Center,             
    Series 1999A:             
2,500    6.125%, 12/01/30    12/09 at 101.00    A3    2,730,700 
3,000    6.250%, 12/01/34    12/09 at 101.00    A3    3,272,730 
2,815    California Health Facilities Financing Authority, Revenue Bonds, Lucile Salter Packard Hospital,    8/13 at 100.00    AAA    3,009,066 
    Series 2003C, 5.000%, 8/15/20 - AMBAC Insured             
1,090    California State Public Works Board, Revenue Bonds, University of California - Davis Medical    11/14 at 100.00    AAA    1,169,930 
    Center, Series 2004II-A, 5.000%, 11/01/21 - MBIA Insured             
3,380    Rancho Mirage Joint Powers Financing Authority, California, Revenue Bonds, Eisenhower Medical    7/14 at 100.00    A3    3,706,069 
    Center, Series 2004, 5.875%, 7/01/26             
 
    Housing/Multifamily - 0.8% (0.6% of Total Investments)             
1,905    Los Angeles, California, GNMA Mortgage-Backed Securities Program Multifamily Housing Revenue Bonds,    7/11 at 102.00    AAA    2,022,291 
    Park Plaza West Senior Apartments, Series 2001B, 5.300%, 1/20/21 (Alternative Minimum Tax)             
 
    Industrials - 1.3% (0.9% of Total Investments)             
3,000    California Pollution Control Financing Authority, Solid Waste Disposal Revenue Bonds, Republic    No Opt. Call    BBB+    3,164,820 
    Services Inc., Series 2002C, 5.250%, 6/01/23 (Alternative Minimum Tax) (Mandatory put 12/01/17)             
 
    Long-Term Care - 3.5% (2.4% of Total Investments)             
3,000    ABAG Finance Authority for Non-Profit Corporations, California, Insured Senior Living Revenue    11/12 at 100.00    A    3,183,780 
    Bonds, Odd Fellows Home of California, Series 2003A, 5.200%, 11/15/22             
5,000    California Statewide Community Development Authority, Revenue Bonds, Jewish Home for the Aging,    11/13 at 100.00    A    5,313,200 
    Series 2003, 5.000%, 11/15/18             
 
    Tax Obligation/General - 34.5% (23.2% of Total Investments)             
5,920    Cajon Valley Union School District, San Diego County, California, General Obligation Bonds, Series    8/10 at 102.00    AAA    6,267,918 
    2002B, 5.125%, 8/01/32 - MBIA Insured             
9,000    California, General Obligation Refunding Bonds, Series 2002, 5.000%, 2/01/22 - MBIA Insured    2/12 at 100.00    AAA    9,513,540 
2,900    California, General Obligation Bonds, Series 2003, 5.000%, 2/01/21    8/13 at 100.00    A    3,086,673 
    Compton Community College District, Los Angeles County, California, General Obligation Bonds,             
    Series 2004A:             
1,315    5.250%, 7/01/22 - MBIA Insured    7/14 at 100.00    AAA    1,448,065 
2,560    5.250%, 7/01/23 - MBIA Insured    7/14 at 100.00    AAA    2,814,925 
2,415    El Monte Union High School District, Los Angeles County, California, General Obligation Bonds,    6/13 at 100.00    AAA    2,554,370 
    Series 2003A, 5.000%, 6/01/28 - FSA Insured             
10,000    Fremont Unified School District, Alameda County, California, General Obligation Bonds, Series    8/12 at 101.00    AAA    10,686,000 
    2002A, 5.000%, 8/01/25 - FGIC Insured             
1,520    Los Angeles Community College District, Los Angeles County, California, General Obligation Bonds,    8/15 at 100.00    AAA    1,632,070 
    Series 2005A, 5.000%, 6/01/26 - FSA Insured             
5,000    Los Angeles Unified School District, California, General Obligation Bonds, Series 2002E, 5.125%,    7/12 at 100.00    AAA    5,320,050 
    1/01/27 - MBIA Insured             
    Los Angeles Unified School District, California, General Obligation Bonds, Series 2003A:             
4,700    5.000%, 7/01/22 - FSA Insured    7/13 at 100.00    AAA    5,078,021 
3,500    5.000%, 1/01/28 - MBIA Insured    7/13 at 100.00    AAA    3,723,440 
1,500    Madera Unified School District, Madera County, California, General Obligation Bonds, Series 2002,    8/12 at 100.00    AAA    1,580,640 
    5.000%, 8/01/28 - FSA Insured             
2,500    Oakland Unified School District, Alameda County, California, General Obligation Bonds, Series 2002,    8/12 at 100.00    AAA    2,731,975 
    5.250%, 8/01/21 - FGIC Insured             
3,300    Peralta Community College District, Alameda County, California, General Obligation Bonds, Election    8/09 at 102.00    AAA    3,444,672 
    of 2000, Series 2001A, 5.000%, 8/01/31 - FGIC Insured             
3,250    San Diego Unified School District, San Diego County, California, General Obligation Bonds, Election    7/11 at 102.00    AAA    3,510,553 
    of 1998, Series 2001C, 5.000%, 7/01/22 - FSA Insured             
1,160    San Gabriel Unified School District, Los Angeles County, California, General Obligation Bonds,    8/15 at 100.00    AAA    1,258,577 
    Series 2005, 5.000%, 8/01/22 - FSA Insured             
    San Jose-Evergreen Community College District, Santa Clara County, California, General Obligation             
    Bonds, Series 2005A:             
395    5.000%, 9/01/25 - MBIA Insured    9/15 at 100.00    AAA    425,340 
575    5.000%, 9/01/27 - MBIA Insured    9/15 at 100.00    AAA    616,176 
3,500    San Mateo County Community College District, California, General Obligation Bonds, Series 2002A,    9/12 at 100.00    AAA    3,694,495 
    5.000%, 9/01/26 - FGIC Insured             
2,460    Vacaville Unified School District, Solano County, California, General Obligation Bonds, Series    8/11 at 101.00    AAA    2,598,498 
    2002, 5.000%, 8/01/26 - FSA Insured             
10,000    Vista Unified School District, San Diego County, California, General Obligation Bonds, Series    8/12 at 100.00    AAA    10,642,900 
    2002A, 5.000%, 8/01/23 - FSA Insured             
 
    Tax Obligation/Limited - 42.0% (28.2% of Total Investments)             
1,450    Baldwin Park Public Financing Authority, California, Sales Tax and Tax Allocation Bonds, Puente    8/13 at 102.00    BBB    1,529,910 
    Merced Redevelopment Project, Series 2003, 5.250%, 8/01/21             
6,895    Brea and Olinda Unified School District, Orange County, California, Certificates of Participation    8/11 at 101.00    AAA    7,318,629 
    Refunding, Series 2002A, 5.125%, 8/01/26 - FSA Insured             
2,290    Burbank Public Financing Authority, California, Revenue Refunding Bonds, Golden State Redevelopment    12/13 at 100.00    AAA    2,519,664 
    Project, Series 2003A, 5.250%, 12/01/19 - AMBAC Insured             
2,200    California Infrastructure Economic Development Bank, Los Angeles County, Revenue Bonds, Department    9/13 at 101.00    AAA    2,341,416 
    of Public Social Services, Series 2003, 5.000%, 9/01/28 - AMBAC Insured             
3,100    California State Public Works Board, Lease Revenue Bonds, Department of Health Services, Richmond    11/15 at 100.00    AAA    3,279,211 
    Lab, Series 2005B, 5.000%, 11/01/30 - XLCA Insured             
7,035    Corona-Norco Unified School District, Riverside County, California, Special Tax Bonds, Community    9/13 at 100.00    AAA    7,446,196 
    Facilities District 98-1, Series 2003, 5.000%, 9/01/28 - MBIA Insured             
3,145    Culver City Redevelopment Agency, California, Tax Allocation Revenue Bonds, Redevelopment Project,    5/11 at 101.00    AAA    3,338,292 
    Series 2002A, 5.125%, 11/01/25 - MBIA Insured             
1,020    Desert Sands Unified School District, Riverside County, California, Certificates of Participation    3/12 at 101.00    AAA    1,095,011 
    Refunding, Series 2002, 5.000%, 3/01/20 - MBIA Insured             
8,720    El Monte, California, Senior Lien Certificates of Participation, Department of Public Services    1/11 at 100.00    AAA    9,132,194 
    Facility Phase II, Series 2001, 5.000%, 1/01/21 - AMBAC Insured             
4,000    Folsom Public Financing Authority, California, Special Tax Revenue Bonds, Series 2004A, 5.000%,    9/12 at 102.00    AAA    4,308,080 
    9/01/21 - AMBAC Insured             
355    Hesperia Community Redevelopment Agency, California, Tax Allocation Bonds, Series 2005A, 5.000%,    9/15 at 100.00    AAA    383,503 
    9/01/20 (WI, settling 6/07/05) - XLCA Insured             
2,115    Inglewood Redevelopment Agency, California, Tax Allocation Refunding Bonds, Merged Area    No Opt. Call    AAA    2,415,055 
    Redevelopment Project, Series 1998A, 5.250%, 5/01/23 - AMBAC Insured             
3,500    La Quinta Redevelopment Agency, California, Tax Allocation Bonds, Redevelopment Project Area 1,    9/11 at 102.00    AAA    3,708,215 
    Series 2001, 5.100%, 9/01/31 - AMBAC Insured             
3,400    La Quinta Redevelopment Agency, California, Tax Allocation Bonds, Redevelopment Project Area 1,    9/12 at 102.00    AAA    3,650,988 
    Series 2002, 5.000%, 9/01/22 - AMBAC Insured             
1,460    Los Angeles, California, Certificates of Participation, Municipal Improvement Corporation, Series    6/13 at 100.00    AAA    1,532,095 
    2003AW, 5.000%, 6/01/33 - AMBAC Insured             
7,000    Los Angeles, California, Certificates of Participation, Real Property Acquisition Program, Series    4/12 at 100.00    AAA    7,448,840 
    2002, 5.200%, 4/01/27 - AMBAC Insured             
4,690    Los Angeles County Metropolitan Transportation Authority, California, Proposition C Second Senior    7/08 at 101.00    AAA    4,935,944 
    Lien Sales Tax Revenue Refunding Bonds, Series 1998A, 5.000%, 7/01/23 - AMBAC Insured             
8,470    Ontario Redevelopment Financing Authority, California, Lease Revenue Bonds, Capital Projects,    8/11 at 101.00    AAA    9,058,157 
    Series 2001, 5.200%, 8/01/29 - AMBAC Insured             
5,000    Palm Desert Financing Authority, California, Tax Allocation Revenue Refunding Bonds, Project Area    4/12 at 102.00    AAA    5,320,850 
    1, Series 2002, 5.000%, 4/01/25 - MBIA Insured             
4,475    Riverside County, California, Asset Leasing Corporate Leasehold Revenue Bonds, Riverside County    6/12 at 101.00    AAA    4,786,863 
    Hospital Project, Series 1997B, 5.000%, 6/01/19 - MBIA Insured             
3,175    San Buenaventura, California, Certificates of Participation, Series 2001C, 5.250%, 2/01/31 - AMBAC    2/11 at 101.00    AAA    3,377,216 
    Insured             
3,730    San Diego Redevelopment Agency, California, Subordinate Lien Tax Increment and Parking Revenue    9/09 at 101.00    Baa2    3,862,602 
    Bonds, Centre City Project, Series 2003B, 5.250%, 9/01/26             
4,000    San Jose Financing Authority, California, Lease Revenue Refunding Bonds, Convention Center Project,    9/11 at 100.00    AAA    4,326,520 
    Series 2001F, 5.000%, 9/01/19 - MBIA Insured             
1,000    Shasta Joint Powers Financing Authority, California, Lease Revenue Bonds, County Administration    4/13 at 100.00    AAA    1,085,050 
    Building Project, Series 2003A, 5.250%, 4/01/23 - MBIA Insured             
2,160    Temecula Redevelopment Agency, California, Tax Allocation Revenue Bonds, Redevelopment Project 1,    8/08 at 102.00    AAA    2,284,999 
    Series 2002, 5.125%, 8/01/27 - MBIA Insured             
 
    Transportation - 5.6% (3.8% of Total Investments)             
2,250    California Infrastructure Economic Development Bank, First Lien Revenue Bonds, San Francisco Bay    7/13 at 100.00    AAA    2,374,583 
    Area Toll Bridge, Series 2003A, 5.000%, 7/01/36 - AMBAC Insured             
7,500    Foothill/Eastern Transportation Corridor Agency, California, Toll Road Revenue Refunding Bonds,    1/14 at 101.00    BBB-    6,335,400 
    Series 1999, 0.000%, 1/15/29             
    San Francisco Airports Commission, California, Revenue Bonds, San Francisco International Airport,             
    Second Series 2003, Issue 29A:             
2,185    5.250%, 5/01/16 (Alternative Minimum Tax) - FGIC Insured    5/13 at 100.00    AAA    2,364,847 
2,300    5.250%, 5/01/17 (Alternative Minimum Tax) - FGIC Insured    5/13 at 100.00    AAA    2,481,217 
 
    U.S. Guaranteed *** - 5.3% (3.6% of Total Investments)             
2,070    Fresno Unified School District, Fresno County, California, General Obligation Bonds, Series 2002G,    8/10 at 102.00    AAA    2,244,687 
    5.125%, 8/01/26 - FSA Insured             
    Fresno Unified School District, Fresno County, California, General Obligation Bonds, Series 2002B:             
1,135    5.125%, 8/01/23 - FGIC Insured    8/10 at 102.00    AAA    1,230,783 
1,190    5.125%, 8/01/24 - FGIC Insured    8/10 at 102.00    AAA    1,290,424 
1,245    5.125%, 8/01/25 - FGIC Insured    8/10 at 102.00    AAA    1,350,066 
1,255    5.125%, 8/01/26 - FGIC Insured    8/10 at 102.00    AAA    1,360,909 
2,000    Metropolitan Water District of Southern California, Water Revenue Bonds, Series 1997A, 5.000%,    1/08 at 101.00    AAA    2,129,300 
    7/01/30 (Pre-refunded to 1/01/08) - MBIA Insured             
2,980    Santa Clarita Community College District, Los Angeles County, California, General Obligation Bonds,    8/11 at 101.00    AAA    3,173,849 
    Series 2002, 5.125%, 8/01/26 (Pre-refunded to 8/01/11) - FGIC Insured             
 
    Utilities - 19.3% (13.0% of Total Investments)             
9,000    Anaheim Public Finance Authority, California, Revenue Bonds, Electric System Distribution    10/12 at 100.00    AAA    9,470,160 
    Facilities, Series 2002A, 5.000%, 10/01/27 - FSA Insured             
10,000    California Pollution Control Financing Authority, Remarketed Revenue Bonds, Pacific Gas and    4/11 at 102.00    AAA    10,972,500 
    Electric Company, Series 1996A, 5.350%, 12/01/16 (Alternative Minimum Tax) - MBIA Insured             
6,000    California Department of Water Resources, Power Supply Revenue Bonds, Series 2002A, 5.125%,    5/12 at 101.00    A2    6,466,740 
    5/01/18             
3,000    Los Angeles Department of Water and Power, California, Power System Revenue Bonds, Series 2001A-1,    7/11 at 100.00    AAA    3,240,960 
    5.250%, 7/01/21 - FSA Insured             
775    Los Angeles Department of Water and Power, California, Power System Revenue Bonds, Series 2003A-2,    7/13 at 100.00    AAA    840,472 
    5.000%, 7/01/21 - MBIA Insured             
6,000    Northern California Power Agency, Revenue Refunding Bonds, Hydroelectric Project 1, Series 1998A,    7/08 at 101.00    AAA    6,340,380 
    5.200%, 7/01/32 - MBIA Insured             
3,000    Sacramento Municipal Utility District, California, Electric Revenue Bonds, Series 2001N, 5.000%,    8/11 at 100.00    AAA    3,142,260 
    8/15/28 - MBIA Insured             
5,630    Southern California Public Power Authority, Subordinate Revenue Refunding Bonds, Transmission    7/12 at 100.00    AAA    5,879,240 
    Project, Series 2002A, 4.750%, 7/01/19 - FSA Insured             
 
    Water and Sewer - 16.7% (11.3% of Total Investments)             
3,000    California Department of Water Resources, Water System Revenue Bonds, Central Valley Project,    12/12 at 100.00    AAA    3,254,010 
    Series 2002X, 5.150%, 12/01/23 - FGIC Insured             
6,100    East Bay Municipal Utility District, Alameda and Contra Costa Counties, California, Water System    6/11 at 100.00    AAA    6,394,384 
    Subordinated Revenue Bonds, Series 2001, 5.000%, 6/01/26 - MBIA Insured (PLG)             
9,000    Eastern Municipal Water District, California, Water and Sewerage System Revenue Certificates of    7/11 at 100.00    AAA    9,370,440 
    Participation, Series 2001B, 5.000%, 7/01/30 - FGIC Insured             
4,500    Los Angeles County Sanitation Districts Financing Authority, California, Senior Revenue Bonds,    10/13 at 100.00    AAA    4,855,365 
    Capital Projects, Series 2003A, 5.000%, 10/01/23 - FSA Insured             
3,475    Manteca Financing Authority, California, Sewerage Revenue Bonds, Series 2003B, 5.000%, 12/01/33 -    12/13 at 100.00    Aaa    3,526,187 
    MBIA Insured             
9,185    Orange County Sanitation District, California, Certificates of Participation, Series 2003, 5.000%,    8/13 at 100.00    AAA    9,639,474 
    2/01/33 - FGIC Insured             
    Semitropic Water Storage District, Kern County, California, Water Banking Revenue Bonds, Series             
    2004A:             
1,315    5.500%, 12/01/20 - XLCA Insured    12/14 at 100.00    AAA    1,471,283 
1,415    5.500%, 12/01/21 - XLCA Insured    12/14 at 100.00    AAA    1,580,796 

$ 335,225    Total Long-Term Investments (cost $330,901,258) - 148.3%                355,986,073 
 
    Other Assets Less Liabilities - 0.9%                2,083,410 
 
    Preferred Shares, at Liquidation Value - (49.2)%                (118,000,000) 
 
    Net Assets Applicable to Common Shares - 100%                $240,069,483 
 
 
 
 
    Forward Swaps outstanding at May 31, 2005:                 
                    Unrealized 
        Notional    Effective    Termination    Appreciation 
        Amount    Date(2)    Date    (Depreciation) 
 
    Agreement with Goldman Sachs dated December 6, 2004, to pay                 
    semi-annually the notional amount multiplied by 5.324% (annualized)                 
    and receive quarterly the notional amount multiplied by the                 
    three-month USD-LIBOR (United States Dollar-London                 
    Inter-Bank Offered Rates).    $5,800,000    7/11/05    7/11/25    $(464,011) 
 
    Agreement with JPMorgan dated January 11, 2005, to pay semi-                 
    annually the notional amount multiplied by 5.235% (annualized)                 
    and receive quarterly the notional amount multiplied by the three-month                 
    USD-LIBOR (United States Dollar-London Inter-Bank Offered Rates).    6,600,000    8/17/05    8/17/25    (440,625) 
 
    Agreement with Merrill Lynch dated February 14, 2005, to pay semi-                 
    annually the notional amount multiplied by 4.886% (annualized)                 
    and receive quarterly the notional amount multiplied by the three-month                 
    USD-LIBOR (United States Dollar-London Inter-Bank Offered Rates).    6,000,000    8/24/05    8/24/25    (128,137) 
 
                    $(1,032,773) 
 
 
 
    At least 80% of the Fund's net assets (including net assets attributable to Preferred shares) are invested in             
    municipal securities that are either covered by Original Issue Insurance, Secondary Market Insurance or Portfolio             
    Insurance any of which ensure the timely payment of principal and interest. Up to 20% of the Fund's net assets             
    (including net assets attributable to Preferred shares) may be invested in municipal securities that are (i) either             
    backed by an escrow or trust containing sufficient U.S. Government or U.S. Government agency securities (also             
    ensuring the timely payment of principal and interest), or (ii) municipal bonds that are rated, at the time of             
    investment, within the four highest grades (Baa or BBB or better by Moody's, S&P or Fitch) or unrated but judged             
    to be of comparable quality by the Adviser.                 
(1)    All percentages shown in the Portfolio of Investments are based on net assets applicable to Common shares             
    unless otherwise noted.                 
(2)    Effective date represents the date on which both the Fund and counterparty commence interest payment accruals             
    on each forward swap contract.                 
*    Optional Call Provisions: Dates (month and year) and prices of the earliest optional call or redemption. There             
    may be other call provisions at varying prices at later dates.                 
**    Ratings: Using the higher of Standard & Poor's or Moody's rating.                 
***    Securities are backed by an escrow or trust containing sufficient U.S. Government or U.S. Government agency             
    securities which ensures the timely payment of principal and interest.                 
(WI)    Security purchased on a when-issued basis.                 
(PLG)    Portion of security, with an aggregate market value of $566,060 has been pledged to collateralize the net             
    payment obligations under forward swap contracts.                 
 
    Income Tax Information                 
 
    The following information is presented on an income tax basis. Differences between amounts for financial statement             
    and federal income tax purposes are primarily due to timing differences in recognizing income on taxable market             
    discount securities and timing differences in recognizing certain gains and losses on investment transactions.             
 
    At May 31, 2005, the cost of investments was $330,924,971.                 
 
    Gross unrealized appreciation and gross unrealized depreciation of investments at May 31, 2005, were as             
    follows:                 
 
    Gross unrealized:                 
     Appreciation                $25,212,483 
       Depreciation                (151,381) 
 
    Net unrealized appreciation of investments                $25,061,102 

Item 2. Controls and Procedures.

  1. The registrant's principal executive and principal financial officers, or persons performing similar functions, have concluded that the registrant's disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940, as amended (the "1940 Act") (17 CFR 270.30a-3(c))) are effective, as of a date within 90 days of the filing date of this report that includes the disclosure required by this paragraph, based on their evaluation of the controls and procedures required by Rule 30a-3(b) under the 1940 Act (17 CFR 270.30a-3(b)) and Rule 13a-15(b) or 15d-15(b) under the Securities Exchange Act of 1934 (17 CFR 240.13a-15(b) or 240.15d-15(b)).
  2. 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.

File as exhibits as part of this Form a separate certification for each principal executive officer and principal financial officer of the registrant as required by Rule 30a-2(a) under the 1940 Act (17 CFR 270.30a-2(a)), exactly as set forth below: EX-99 CERT Attached hereto.


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)         Nuveen Insured California Dividend Advantage Municipal Fund        

By (Signature and Title)*          /s/ Jessica R. Droeger--Vice President and Secretary        

Date         07/29/05        

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 (Signature and Title)*         /s/ Gifford R. Zimmerman--Chief Administrative Officer (principal executive officer)        

Date         07/29/05        

By (Signature and Title)*         /s/ Stephen D. Foy--Vice President and Controller (principal financial officer)        

Date         07/29/05        

* Print the name and title of each signing officer under his or her signature.