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)

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


Kevin J. McCarthy 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:            8/31          

Date of reporting period:         5/31/08         

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, 2008             
Principal        Optional Call         
Amount (000)    Description (1)    Provisions (2)    Ratings (3)    Value 
    Consumer Staples – 3.7% (2.5% of Total Investments)             
$      14,155    Golden State Tobacco Securitization Corporation, California, Enhanced Tobacco Settlement    6/22 at 100.00    BBB   $   8,427,462 
     Asset-Backed Bonds, Series 2007A-2, 0.000%, 6/01/37             
    Education and Civic Organizations – 4.8% (3.2% of Total Investments)             
1,675    California Educational Facilities Authority, Revenue Bonds, University of San Diego, Series    10/12 at 100.00    A2    1,711,967 
     2002A, 5.250%, 10/01/30             
9,000    California State University, Systemwide Revenue Bonds, Series 2002A, 5.125%, 11/01/26 –    11/12 at 100.00    AAA    9,159,660 
     AMBAC Insured             
10,675    Total Education and Civic Organizations            10,871,627 
    Health Care – 6.6% (4.4% of Total Investments)             
5,000    ABAG Finance Authority for Non-Profit Corporations, California, Cal-Mortgage Insured Revenue    4/12 at 100.00    A+    5,128,400 
     Bonds, Sansum-Santa Barbara Medical Foundation Clinic, Series 2002A, 5.600%, 4/01/26             
5,000    California Health Facilities Financing Authority, Revenue Bonds, Kaiser Permanante System,    3/16 at 100.00    A+    4,907,700 
     Series 2006, 5.250%, 3/01/45             
2,815    California Health Facilities Financing Authority, Revenue Bonds, Lucile Salter Packard    8/13 at 100.00    AAA    2,939,282 
     Children’s Hospital, Series 2003C, 5.000%, 8/15/20 – AMBAC Insured             
1,748    California Statewide Communities Development Authority, Revenue Bonds, Saint Joseph Health    7/18 at 100.00    AAA    1,947,379 
     System, Trust 2554, 15.140%, 7/01/47 – FSA Insured (IF)             
14,563    Total Health Care            14,922,761 
    Housing/Multifamily – 1.3% (0.8% of Total Investments)             
1,000    California Statewide Community Development Authority, Student Housing Revenue Bonds,    8/12 at 100.00    N/R    948,520 
     EAH-Irvine East Campus Apartments, LLC Project, Series 2002A, 5.500%, 8/01/22 – ACA Insured             
1,905    Los Angeles, California, GNMA Mortgage-Backed Securities Program Multifamily Housing Revenue    7/11 at 102.00    AAA    1,931,175 
     Bonds, Park Plaza West Senior Apartments, Series 2001B, 5.300%, 1/20/21 (Alternative             
     Minimum Tax)             
2,905    Total Housing/Multifamily            2,879,695 
    Housing/Single Family – 0.2% (0.2% of Total Investments)             
505    California Housing Finance Agency, Home Mortgage Revenue Bonds, Series 2006H, 5.750%,    2/16 at 100.00    Aa2    513,878 
     8/01/30 – FGIC Insured (Alternative Minimum Tax)             
    Industrials – 1.3% (0.8% of Total Investments)             
3,000    California Pollution Control Financing Authority, Solid Waste Disposal Revenue Bonds, Republic    No Opt. Call    BBB+    2,902,410 
     Services Inc., Series 2002C, 5.250%, 6/01/23 (Mandatory put 12/01/17) (Alternative Minimum Tax)             
    Long-Term Care – 1.3% (0.9% of Total Investments)             
3,000    ABAG Finance Authority for Non-Profit Corporations, California, Insured Senior Living Revenue    11/12 at 100.00    A+    3,057,210 
     Bonds, Odd Fellows Home of California, Series 2003A, 5.200%, 11/15/22             
    Tax Obligation/General – 25.8% (17.1% of Total Investments)             
5,920    Cajon Valley Union School District, San Diego County, California, General Obligation Bonds,    8/10 at 102.00    AAA    5,992,638 
     Series 2002B, 5.125%, 8/01/32 – MBIA Insured             
2,900    California, General Obligation Bonds, Series 2003, 5.000%, 2/01/21    8/13 at 100.00    A+    3,003,762 
8,250    California, General Obligation Refunding Bonds, Series 2002, 5.000%, 2/01/22 – MBIA Insured    2/12 at 100.00    AAA    8,421,188 
230    El Monte Union High School District, Los Angeles County, California, General Obligation Bonds,    6/13 at 100.00    AAA    235,929 
     Series 2003A, 5.000%, 6/01/28 – FSA Insured             
1,365    Fontana Unified School District, San Bernardino County, California, General Obligation Bonds,    8/18 at 100.00    AAA    1,755,800 
     Trust 2668, 15.350%, 8/01/28 – FSA Insured (IF)             
10,000    Fremont Unified School District, Alameda County, California, General Obligation Bonds, Series    8/12 at 101.00    Aa3    10,278,800 
     2002A, 5.000%, 8/01/25 – FGIC Insured             
1,000    Los Rios Community College District, Sacramento, El Dorado and Yolo Counties, California,    8/14 at 102.00    AAA    1,047,730 
     General Obligation Bonds, Series 2006C, 5.000%, 8/01/25 – FSA Insured             
1,500    Madera Unified School District, Madera County, California, General Obligation Bonds, Series    8/12 at 100.00    AAA    1,529,850 
     2002, 5.000%, 8/01/28 – FSA Insured             
2,000    Murrieta Valley Unified School District, Riverside County, California, General Obligation    9/17 at 100.00    AAA    1,964,000 
     Bonds, Series 2007, 4.500%, 9/01/30 – FSA Insured             
2,500    Oakland Unified School District, Alameda County, California, General Obligation Bonds, Series    8/12 at 100.00    BBB+    2,543,100 
     2002, 5.250%, 8/01/21 – FGIC Insured             
375    Roseville Joint Union High School District, Placer County, California, General Obligation    8/15 at 100.00    AA–    386,591 
     Bonds, Series 2006B, 5.000%, 8/01/27 – FGIC Insured             
3,250    San Diego Unified School District, San Diego County, California, General Obligation Bonds,    7/11 at 102.00    AAA    3,521,570 
     Election of 1998, Series 2001C, 5.000%, 7/01/22 – FSA Insured             
3,500    San Mateo County Community College District, California, General Obligation Bonds, Series    9/12 at 100.00    Aa1    3,585,855 
     2002A, 5.000%, 9/01/26 – FGIC Insured             
10,000    Vista Unified School District, San Diego County, California, General Obligation Bonds, Series    8/12 at 100.00    AAA    10,442,499 
     2002A, 5.000%, 8/01/23 – FSA Insured             
3,905    West Kern Community College District, California, General Obligation Bonds, Election 2004,    11/17 at 100.00    A    3,919,409 
     Series 2007C, 5.000%, 10/01/32 – XLCA Insured             
56,695    Total Tax Obligation/General            58,628,721 
    Tax Obligation/Limited – 50.4% (33.5% of Total Investments)             
1,450    Baldwin Park Public Financing Authority, California, Sales Tax and Tax Allocation Bonds,    8/13 at 102.00    BBB    1,511,930 
     Puente Merced Redevelopment Project, Series 2003, 5.250%, 8/01/21             
6,895    Brea and Olinda Unified School District, Orange County, California, Certificates of    8/11 at 101.00    AAA    7,170,593 
     Participation Refunding, Series 2002A, 5.125%, 8/01/26 – FSA Insured             
2,200    California Infrastructure Economic Development Bank, Los Angeles County, Revenue Bonds,    9/13 at 101.00    AAA    2,260,434 
     Department 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,    11/15 at 100.00    A    3,103,689 
     Richmond Lab, Series 2005B, 5.000%, 11/01/30 – XLCA Insured             
465    Capistrano Unified School District, Orange County, California, Special Tax Bonds, Community    9/15 at 100.00    Baa3    468,622 
     Facilities District, Series 2005, 5.000%, 9/01/24 – FGIC Insured             
1,400    Chino Redevelopment Agency, California, Merged Chino Redevelopment Project Area Tax Allocation    9/16 at 101.00    AAA    1,382,682 
     Bonds, Series 2006, 5.000%, 9/01/38 – AMBAC Insured             
7,035    Corona-Norco Unified School District, Riverside County, California, Special Tax Bonds,    9/13 at 100.00    AAA    7,200,745 
     Community 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    5/11 at 101.00    AAA    3,245,451 
     Project, Series 2002A, 5.125%, 11/01/25 – MBIA Insured             
8,720    El Monte, California, Senior Lien Certificates of Participation, Department of Public Services    1/11 at 100.00    AAA    8,822,896 
     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,    9/12 at 102.00    AAA    4,090,160 
     5.000%, 9/01/21 – AMBAC Insured             
4,985    Golden State Tobacco Securitization Corporation, California, Enhanced Tobacco Settlement    6/15 at 100.00    AAA    5,480,858 
     Revenue Bonds, Drivers Trust 2091, 11.873%, 6/01/45 – AGC Insured (IF)             
8,780    Golden State Tobacco Securitization Corporation, California, Tobacco Settlement Asset-Backed    6/15 at 100.00    Aaa    8,471,910 
     Revenue Bonds, Series 2005A, 5.000%, 6/01/45 – AMBAC Insured             
1,300    Hesperia Public Financing Authority, California, Redevelopment and Housing Projects Tax    9/17 at 100.00    A3    1,231,165 
     Allocation Bonds, Series 2007A, 5.000%, 9/01/37 – XLCA Insured             
2,115    Inglewood Redevelopment Agency, California, Tax Allocation Refunding Bonds, Merged Area    No Opt. Call    AAA    2,269,247 
     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    3,529,540 
     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    3,515,872 
     Series 2002, 5.000%, 9/01/22 – AMBAC Insured             
845    Los Angeles Community Redevelopment Agency, California, Lease Revenue Bonds, Manchester Social    9/15 at 100.00    Aaa    843,648 
     Services Project, Series 2005, 5.000%, 9/01/37 – AMBAC Insured             
4,690    Los Angeles County Metropolitan Transportation Authority, California, Proposition C Second    7/08 at 101.00    AAA    4,740,933 
     Senior Lien Sales Tax Revenue Refunding Bonds, Series 1998A, 5.000%, 7/01/23 – AMBAC Insured             
1,460    Los Angeles, California, Certificates of Participation, Municipal Improvement Corporation,    6/13 at 100.00    AAA    1,476,732 
     Series 2003AW, 5.000%, 6/01/33 – AMBAC Insured             
7,000    Los Angeles, California, Certificates of Participation, Series 2002, 5.200%, 4/01/27 –    4/12 at 100.00    AAA    7,224,910 
     AMBAC Insured             
8,470    Ontario Redevelopment Financing Authority, California, Lease Revenue Bonds, Capital Projects,    8/11 at 101.00    AAA    8,657,865 
     Series 2001, 5.200%, 8/01/29 – AMBAC Insured             
5,000    Palm Desert Financing Authority, California, Tax Allocation Revenue Refunding Bonds, Project    4/12 at 102.00    AAA    5,139,700 
     Area 1, Series 2002, 5.000%, 4/01/25 – MBIA Insured             
3,000    Puerto Rico Highway and Transportation Authority, Highway Revenue Bonds, Series 2007N, 5.250%,    No Opt. Call    BBB+    3,011,310 
     7/01/39 – FGIC Insured             
405    Rialto Redevelopment Agency, California, Tax Allocation Bonds, Merged Project Area, Series    9/15 at 100.00    A–    403,773 
     2005A, 5.000%, 9/01/35 – XLCA Insured             
4,475    Riverside County, California, Asset Leasing Corporate Leasehold Revenue Bonds, Riverside    6/12 at 101.00    AAA    4,619,990 
     County Hospital Project, Series 1997B, 5.000%, 6/01/19 – MBIA Insured             
505    Roseville, California, Certificates of Participation, Public Facilities, Series 2003A, 5.000%,    8/13 at 100.00    AAA    512,545 
     8/01/25 – AMBAC Insured             
3,175    San Buenaventura, California, Certificates of Participation, Series 2001C, 5.250%, 2/01/31 –    2/11 at 101.00    AAA    3,199,575 
     AMBAC Insured             
3,730    San Diego Redevelopment Agency, California, Subordinate Lien Tax Increment and Parking Revenue    9/09 at 101.00    Baa2    3,739,623 
     Bonds, Centre City Project, Series 2003B, 5.250%, 9/01/26             
4,000    San Jose Financing Authority, California, Lease Revenue Refunding Bonds, Convention Center    9/11 at 100.00    AAA    4,160,880 
     Project, Series 2001F, 5.000%, 9/01/19 – MBIA Insured             
1,000    San Jose Redevelopment Agency, California, Tax Allocation Bonds, Merged Project Area, Series    8/15 at 100.00    AAA    1,017,410 
     2005A, 5.000%, 8/01/28 – MBIA Insured             
2,160    Temecula Redevelopment Agency, California, Tax Allocation Revenue Bonds, Redevelopment Project 1,    8/08 at 102.00    AAA    2,206,872 
     Series 2002, 5.125%, 8/01/27 – MBIA Insured             
112,405    Total Tax Obligation/Limited            114,711,560 
    Transportation – 5.0% (3.3% of Total Investments)             
7,500    Foothill/Eastern Transportation Corridor Agency, California, Toll Road Revenue Refunding    1/14 at 101.00    BBB–    6,907,575 
     Bonds, 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 – FGIC Insured (Alternative Minimum Tax)    5/13 at 100.00    A1    2,225,903 
2,300     5.250%, 5/01/17 – FGIC Insured (Alternative Minimum Tax)    5/13 at 100.00    A1    2,330,107 
11,985    Total Transportation            11,463,585 
    U.S. Guaranteed – 23.4% (15.6% of Total Investments) (4)             
6,000    California Department of Water Resources, Power Supply Revenue Bonds, Series 2002A, 5.125%,    5/12 at 101.00    Aaa    6,555,900 
     5/01/18 (Pre-refunded 5/01/12)             
35    California Department of Water Resources, Water System Revenue Bonds, Central Valley Project,    12/12 at 100.00    Aa2 (4)    38,330 
     Series 2002X, 5.150%, 12/01/23 (Pre-refunded 12/01/12) – FGIC Insured             
2,500    California Health Facilities Financing Authority, Revenue Bonds, Cedars-Sinai Medical Center,    12/09 at 101.00    N/R (4)    2,671,750 
     Series 1999A, 6.125%, 12/01/30 (Pre-refunded 12/01/09)             
2,250    California Infrastructure Economic Development Bank, First Lien Revenue Bonds, San Francisco    1/28 at 100.00    AAA    2,442,938 
     Bay Area Toll Bridge, Series 2003A, 5.000%, 7/01/36 (Pre-refunded 1/01/28) – AMBAC Insured             
9,000    Eastern Municipal Water District, California, Water and Sewerage System Revenue Certificates    7/11 at 100.00    AA– (4)    9,635,040 
     of Participation, Series 2001B, 5.000%, 7/01/30 (Pre-refunded 7/01/11) – FGIC Insured             
    Fresno Unified School District, Fresno County, California, General Obligation Bonds,             
    Series 2002B:             
1,135     5.125%, 8/01/23 – FGIC Insured (ETM)    8/10 at 102.00    A+ (4)    1,188,254 
1,190     5.125%, 8/01/24 – FGIC Insured (ETM)    8/10 at 102.00    A+ (4)    1,245,835 
1,245     5.125%, 8/01/25 – FGIC Insured (ETM)    8/10 at 102.00    A+ (4)    1,304,399 
1,255     5.125%, 8/01/26 – FGIC Insured (ETM)    8/10 at 102.00    A+ (4)    1,288,283 
2,070    Fresno Unified School District, Fresno County, California, General Obligation Bonds, Series    8/10 at 102.00    AAA    2,165,965 
     2002G, 5.125%, 8/01/26 – FSA Insured (ETM)             
4,500    Golden State Tobacco Securitization Corporation, California, Tobacco Settlement Asset-Backed    6/13 at 100.00    AAA    5,391,630 
     Revenue Bonds, Series 2003A-2, 7.900%, 6/01/42 (Pre-refunded 6/01/13)             
5,000    Los Angeles Unified School District, California, General Obligation Bonds, Series 2002E,    7/12 at 100.00    AAA    5,432,700 
     5.125%, 1/01/27 (Pre-refunded 7/01/12) – MBIA Insured             
4,225    Northern California Power Agency, Revenue Refunding Bonds, Hydroelectric Project 1, Series    7/08 at 101.00    AAA    4,277,686 
     1998A, 5.200%, 7/01/32 (Pre-refunded 7/01/08) – MBIA Insured             
3,380    Rancho Mirage Joint Powers Financing Authority, California, Revenue Bonds, Eisenhower Medical    7/14 at 100.00    A3 (4)    3,823,422 
     Center, Series 2004, 5.875%, 7/01/26 (Pre-refunded 7/01/14)             
2,980    Santa Clarita Community College District, Los Angeles County, California, General Obligation    8/11 at 101.00    AA– (4)    3,235,326 
     Bonds, Series 2002, 5.125%, 8/01/26 (Pre-refunded 8/01/11) – FGIC Insured             
2,460    Vacaville Unified School District, Solano County, California, General Obligation Bonds, Series    8/11 at 101.00    AAA    2,661,474 
     2002, 5.000%, 8/01/26 (Pre-refunded 8/01/11) – FSA Insured             
49,225    Total U.S. Guaranteed            53,358,932 
    Utilities – 16.0% (10.6% of Total Investments)             
9,000    Anaheim Public Finance Authority, California, Revenue Bonds, Electric System Distribution    10/12 at 100.00    AAA    9,192,690 
     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    10,384,500 
     Electric Company, Series 1996A, 5.350%, 12/01/16 – MBIA Insured (Alternative Minimum Tax)             
2,490    Long Beach Bond Finance Authority, California, Natural Gas Purchase Revenue Bonds, Series    No Opt. Call    A+    2,252,678 
     2007A, 5.000%, 11/15/35             
3,000    Los Angeles Department of Water and Power, California, Power System Revenue Bonds, Series    7/11 at 100.00    AAA    3,138,810 
     2001A-1, 5.250%, 7/01/21 – FSA Insured             
830    Merced Irrigation District, California, Electric System Revenue Bonds, Series 2005, 5.125%,    9/15 at 100.00    A–    830,930 
     9/01/31 – XLCA Insured             
1,775    Northern California Power Agency, Revenue Refunding Bonds, Hydroelectric Project 1, Series    7/08 at 101.00    AAA    1,788,579 
     1998A, 5.200%, 7/01/32 – MBIA Insured             
3,000    Sacramento Municipal Utility District, California, Electric Revenue Bonds, Series 2001N,    8/11 at 100.00    AAA    3,029,850 
     5.000%, 8/15/28 – MBIA Insured             
5,630    Southern California Public Power Authority, Subordinate Revenue Refunding Bonds, Transmission    7/12 at 100.00    AAA    5,814,326 
     Project, Series 2002A, 4.750%, 7/01/19 – FSA Insured             
35,725    Total Utilities            36,432,363 
    Water and Sewer – 10.7% (7.1% of Total Investments)             
2,965    California Department of Water Resources, Water System Revenue Bonds, Central Valley Project,    12/12 at 100.00    AAA    3,107,972 
     Series 2002X, 5.150%, 12/01/23 – FGIC Insured             
750    Fortuna Public Finance Authority, California, Water Revenue Bonds, Series 2006, 5.000%,    10/16 at 100.00    AAA    772,628 
     10/01/36 – FSA Insured             
570    Healdsburg Public Financing Authority, California, Wastewater Revenue Bonds, Series 2006,    4/16 at 100.00    AAA    576,224 
     5.000%, 4/01/36 – MBIA Insured             
4,500    Los Angeles County Sanitation Districts Financing Authority, California, Senior Revenue Bonds,    10/13 at 100.00    AAA    4,716,270 
     Capital Projects, Series 2003A, 5.000%, 10/01/23 – FSA Insured             
2,425    Manteca Financing Authority, California, Sewerage Revenue Bonds, Series 2003B, 5.000%,    12/13 at 100.00    Aaa    2,465,207 
     12/01/33 – MBIA Insured             
500    Marina Coast Water District, California, Enterprise Certificate of Participation, Series 2006,    6/16 at 100.00    AAA    502,620 
     5.000%, 6/01/31 – MBIA Insured             
9,185    Orange County Sanitation District, California, Certificates of Participation, Series 2003,    8/13 at 100.00    AAA    9,276,023 
     5.000%, 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    A    1,390,244 
1,415     5.500%, 12/01/21 – XLCA Insured    12/14 at 100.00    A    1,490,094 
23,625    Total Water and Sewer            24,297,282 
$       338,463    Total Investments (cost $332,125,359) – 150.5%            342,467,486 
    Other Assets Less Liabilities – 1.4%            3,111,724 
    Preferred Shares, at Liquidation Value – (51.9)% (5)            (118,000,000)
    Net Assets Applicable to Common Shares – 100%           $   227,579,210 

    As of May 31, 2008, 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 which ensures 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) rated, at the time of investment, within the four highest grades (Baa or BBB or better by Moody’s, 
    Standard & Poor’s 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)    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. Certain mortgage-backed securities 
    may be subject to periodic principal paydowns. 
(3)    Ratings: Using the higher of Standard & Poor’s Group (“Standard & Poor’s”) or Moody’s Investor Service, 
    Inc. (“Moody’s”) rating. Ratings below BBB by Standard & Poor’s or Baa by Moody’s are considered to 
    be below investment grade. 
    The Portfolio of Investments may reflect the ratings on certain bonds insured by ACA, AMBAC, CIFG, FGIC, 
    MBIA, RAAI and XLCA as of May 31, 2008. Subsequent to May 31, 2008, and during the period this Portfolio 
    of Investments was prepared, there may have been reductions to the ratings of certain bonds resulting from 
    changes to the ratings of the underlying insurers both during the period and after period end. Such reductions 
    would likely reduce the effective rating of many of the bonds insured by that insurer or insurers presented 
    at period end. 
(4)    Backed by an escrow or trust containing sufficient U.S. Government or U.S. Government agency securities 
    which ensure the timely payment of principal and interest. Such investments are normally considered to 
    be equivalent to AAA rated securities. 
(5)    Preferred Shares, at Liquidation Value as a percentage of total investments is (34.5)%. 
N/R    Not rated. 
(ETM)    Escrowed to maturity. 
(IF)    Inverse floating rate investment. 

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 taxable market discount, timing differences in recognizing certain gains and losses on investment transactions and the treatment of investments in inverse floating rate transactions subject to SFAS No.140. To the extent that differences arise that are permanent in nature, such amounts are reclassified within the capital accounts on the Statement of Assets and Liabilities presented in the annual report, based on their federal tax basis treatment; temporary differences do not require reclassification. Temporary and permanent differences do not impact the net asset value of the Fund.

At May 31, 2008, the cost of investments was $333,496,736.

Gross unrealized appreciation and gross unrealized depreciation of investments at May 31, 2008, were as follows:

Gross unrealized:     
  Appreciation    $14,783,274 
  Depreciation    (5,812,524) 
Net unrealized appreciation (depreciation) of investments    $  8,970,750 

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: See 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/ Kevin J. McCarthy                    
                                                  Kevin J. McCarthy
                                                  Vice President and Secretary

Date         July 29, 2008        

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                    
                                                 Gifford R. Zimmerman
                                                 Chief Administrative Officer (principal executive officer) 

Date         July 29, 2008        

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

Date        July 29, 2008