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:         5/31/07         

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, 2007             
Principal        Optional Call         
Amount (000)    Description (1)    Provisions (2)    Ratings (3)    Value 
    Consumer Staples – 4.6% (3.0% of Total Investments)             
$        14,155    Golden State Tobacco Securitization Corporation, California, Enhanced Tobacco Settlement    6/22 at 100.00    BBB   $   10,724,818 
     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    1,733,474 
     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    9,421,470 
     AMBAC Insured             
10,675    Total Education and Civic Organizations            11,154,944 
    Health Care – 5.1% (3.4% of Total Investments)             
5,000    ABAG Finance Authority for Non-Profit Corporations, California, Cal-Mortgage Insured Revenue    4/12 at 100.00    A    5,286,200 
     Bonds, Sansum-Santa Barbara Medical Foundation Clinic, Series 2002A, 5.600%, 4/01/26             
2,815    California Health Facilities Financing Authority, Revenue Bonds, Lucile Salter Packard    8/13 at 100.00    AAA    2,937,509 
     Children’s Hospital, Series 2003C, 5.000%, 8/15/20 – AMBAC Insured             
3,380    Rancho Mirage Joint Powers Financing Authority, California, Revenue Bonds, Eisenhower Medical    7/14 at 100.00    A3    3,675,108 
     Center, Series 2004, 5.875%, 7/01/26             
11,195    Total Health Care            11,898,817 
    Housing/Multifamily – 1.3% (0.9% of Total Investments)             
1,000    California Statewide Community Development Authority, Student Housing Revenue Bonds, EAH –    8/12 at 100.00    A    1,051,220 
     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    1,971,866 
     Bonds, Park Plaza West Senior Apartments, Series 2001B, 5.300%, 1/20/21 (Alternative             
     Minimum Tax)             
2,905    Total Housing/Multifamily            3,023,086 
    Housing/Single Family – 0.2% (0.1% of Total Investments)             
555    California Housing Finance Agency, Home Mortgage Revenue Bonds, Series 2006H, 5.750%,    2/16 at 100.00    AAA    589,882 
     8/01/30 – FGIC Insured (Alternative Minimum Tax)             
    Industrials – 1.4% (0.9% of Total Investments)             
3,000    California Pollution Control Financing Authority, Solid Waste Disposal Revenue Bonds, Republic    No Opt. Call    BBB+    3,155,850 
     Services Inc., Series 2002C, 5.250%, 6/01/23 (Mandatory put 12/01/17) (Alternative Minimum Tax)             
    Long-Term Care – 3.5% (2.3% of Total Investments)             
3,000    ABAG Finance Authority for Non-Profit Corporations, California, Insured Senior Living Revenue    11/12 at 100.00    A    3,108,000 
     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    11/13 at 100.00    A    5,174,300 
     Aging, Series 2003, 5.000%, 11/15/18             
8,000    Total Long-Term Care            8,282,300 
    Tax Obligation/General – 27.7% (18.3% of Total Investments)             
5,920    Cajon Valley Union School District, San Diego County, California, General Obligation Bonds,    8/10 at 102.00    AAA    6,185,630 
     Series 2002B, 5.125%, 8/01/32 – MBIA Insured             
3,000    California State, General Obligation Bonds, Series 2007, 4.250%, 12/01/35 – AMBAC Insured    12/16 at 100.00    AAA    2,793,210 
2,900    California, General Obligation Bonds, Series 2003, 5.000%, 2/01/21    8/13 at 100.00    A+    3,031,950 
8,250    California, General Obligation Refunding Bonds, Series 2002, 5.000%, 2/01/22 – MBIA Insured    2/12 at 100.00    AAA    8,521,260 
2,560    Compton Community College District, Los Angeles County, California, General Obligation Bonds,    7/14 at 100.00    AAA    2,752,333 
     Series 2004A, 5.250%, 7/01/23 – MBIA Insured             
230    El Monte Union High School District, Los Angeles County, California, General Obligation Bonds,    6/13 at 100.00    AAA    239,299 
     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    10,446,700 
     2002A, 5.000%, 8/01/25 – FGIC Insured             
4,115    Los Angeles Unified School District, California, General Obligation Bonds, Series 2006B,    7/16 at 100.00    AAA    4,251,330 
     4.750%, 7/01/24 – FGIC Insured (UB)             
1,000    Los Rios Community College District, Sacramento, El Dorado and Yolo Counties, California,    8/14 at 102.00    AAA    1,056,390 
     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    1,556,535 
     2002, 5.000%, 8/01/28 – FSA Insured             
2,500    Oakland Unified School District, Alameda County, California, General Obligation Bonds, Series    8/12 at 100.00    AAA    2,652,200 
     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    AAA    394,346 
     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    3,454,653 
     Election of 1998, Series 2001C, 5.000%, 7/01/22 – FSA Insured             
1,960    San Diego Unified School District, San Diego County, California, General Obligation Bonds,    7/16 at 101.00    AAA    1,955,864 
     Series 2006G-1, 4.500%, 7/01/29 – FSA Insured (UB)             
1,160    San Gabriel Unified School District, Los Angeles County, California, General Obligation Bonds,    8/15 at 100.00    AAA    1,224,357 
     Series 2005, 5.000%, 8/01/22 – FSA Insured             
3,500    San Mateo County Community College District, California, General Obligation Bonds, Series    9/12 at 100.00    AAA    3,633,805 
     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    10,410,000 
     2002A, 5.000%, 8/01/23 – FSA Insured             
62,220    Total Tax Obligation/General            64,559,862 
    Tax Obligation/Limited – 44.1% (29.2% of Total Investments)             
1,450    Baldwin Park Public Financing Authority, California, Sales Tax and Tax Allocation Bonds,    8/13 at 102.00    BBB    1,522,326 
     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    7,197,828 
     Participation Refunding, Series 2002A, 5.125%, 8/01/26 – FSA Insured             
1,320    Burbank Public Financing Authority, California, Revenue Refunding Bonds, Golden State    12/13 at 100.00    AAA    1,407,094 
     Redevelopment Project, Series 2003A, 5.250%, 12/01/19 – AMBAC Insured (4)             
2,200    California Infrastructure Economic Development Bank, Los Angeles County, Revenue Bonds,    9/13 at 101.00    AAA    2,295,612 
     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    AAA    3,230,634 
     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    AAA    489,189 
     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    1,472,744 
     Bonds, Series 2006, 5.000%, 9/01/38 – AMBAC Insured (UB)             
7,035    Corona-Norco Unified School District, Riverside County, California, Special Tax Bonds,    9/13 at 100.00    AAA    7,303,878 
     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    3,288,443 
     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    8,936,430 
     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    4,186,520 
     5.000%, 9/01/21 – AMBAC Insured             
2,115    Inglewood Redevelopment Agency, California, Tax Allocation Refunding Bonds, Merged Area    No Opt. Call    AAA    2,346,085 
     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    3,646,545 
     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    3,568,266 
     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    878,217 
     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    4,782,721 
     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    1,510,034 
     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    7,317,870 
     AMBAC Insured             
8,470    Ontario Redevelopment Financing Authority, California, Lease Revenue Bonds, Capital Projects,    8/11 at 101.00    AAA    8,897,904 
     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    5,217,100 
     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    AAA    3,412,170 
     7/01/32 – MBIA Insured             
405    Rialto Redevelopment Agency, California, Tax Allocation Bonds, Merged Project Area, Series    9/15 at 100.00    AAA    420,637 
     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    4,681,835 
     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    524,357 
     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    3,311,525 
     AMBAC Insured             
3,730    San Diego Redevelopment Agency, California, Subordinate Lien Tax Increment and Parking Revenue    9/09 at 101.00    Baa2    3,833,209 
     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    4,158,640 
     Project, Series 2001F, 5.000%, 9/01/19 – MBIA Insured             
1,000    Shasta Joint Powers Financing Authority, California, Lease Revenue Bonds, County    4/13 at 100.00    AAA    1,054,560 
     Administration Building Project, Series 2003A, 5.250%, 4/01/23 – MBIA Insured             
2,160    Temecula Redevelopment Agency, California, Tax Allocation Revenue Bonds, Redevelopment    8/08 at 102.00    AAA    2,221,776 
     Project 1, Series 2002, 5.125%, 8/01/27 – MBIA Insured             
98,660    Total Tax Obligation/Limited            103,114,149 
    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–    6,976,050 
     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    AAA    2,302,837 
2,300     5.250%, 5/01/17 – FGIC Insured (Alternative Minimum Tax)    5/13 at 100.00    AAA    2,422,820 
11,985    Total Transportation            11,701,707 
    U.S. Guaranteed – 18.9% (12.5% of Total Investments) (5)             
970    Burbank Public Financing Authority, California, Revenue Refunding Bonds, Golden State    12/13 at 100.00    Aaa    1,050,044 
     Redevelopment Project, Series 2003A, 5.250%, 12/01/19 (Pre-refunded 12/01/13) – AMBAC Insured             
6,000    California Department of Water Resources, Power Supply Revenue Bonds, Series 2002A, 5.125%,    5/12 at 101.00    Aaa    6,410,100 
     5/01/18 (Pre-refunded 5/01/12)             
    California Health Facilities Financing Authority, Revenue Bonds, Cedars-Sinai Medical Center,             
    Series 1999A:             
2,500     6.125%, 12/01/30 (Pre-refunded 12/01/09)    12/09 at 101.00    N/R (5)    2,672,200 
1,000     6.250%, 12/01/34 (Pre-refunded 12/01/09)    12/09 at 101.00    N/R (5)    1,071,840 
2,250    California Infrastructure Economic Development Bank, First Lien Revenue Bonds, San Francisco    1/28 at 100.00    AAA    2,497,973 
     Bay Area Toll Bridge, Series 2003A, 5.000%, 7/01/36 (Pre-refunded 1/01/28) – AMBAC Insured             
1,000    California, General Obligation Bonds, Series 2004, 5.125%, 2/01/27 (Pre-refunded 2/01/14)    2/14 at 100.00    A+ (5)    1,073,980 
2,185    El Monte Union High School District, Los Angeles County, California, General Obligation Bonds,    6/13 at 100.00    Aaa    2,323,900 
     Series 2003A, 5.000%, 6/01/28 (Pre-refunded 6/01/13) – FSA 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    AAA    1,194,712 
1,190     5.125%, 8/01/24 – FGIC Insured (ETM)    8/10 at 102.00    AAA    1,252,606 
1,245     5.125%, 8/01/25 – FGIC Insured (ETM)    8/10 at 102.00    AAA    1,312,255 
1,255     5.125%, 8/01/26 – FGIC Insured (ETM)    8/10 at 102.00    AAA    1,316,370 
2,070    Fresno Unified School District, Fresno County, California, General Obligation Bonds, Series    8/10 at 102.00    AAA    2,171,223 
     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    5,439,465 
     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    5,309,400 
     5.125%, 1/01/27 (Pre-refunded 7/01/12) – MBIA Insured             
3,000    Peralta Community College District, Alameda County, California, General Obligation Bonds,    8/09 at 102.00    AAA    3,141,870 
     Election of 2000, Series 2001A, 5.000%, 8/01/31 (Pre-refunded 8/01/09) – FGIC Insured             
2,980    Santa Clarita Community College District, Los Angeles County, California, General Obligation    8/11 at 101.00    AAA    3,162,316 
     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    2,598,744 
     2002, 5.000%, 8/01/26 (Pre-refunded 8/01/11) – FSA Insured             
40,740    Total U.S. Guaranteed            43,998,998 
    Utilities – 16.7% (11.1% of Total Investments)             
9,000    Anaheim Public Finance Authority, California, Revenue Bonds, Electric System Distribution    10/12 at 100.00    AAA    9,349,020 
     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    10,615,400 
     Electric Company, Series 1996A, 5.350%, 12/01/16 – MBIA Insured (Alternative Minimum Tax)             
3,000    Los Angeles Department of Water and Power, California, Power System Revenue Bonds, Series    7/11 at 100.00    AAA    3,135,270 
     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    AAA    872,662 
     9/01/31 – XLCA Insured             
6,000    Northern California Power Agency, Revenue Refunding Bonds, Hydroelectric Project 1, Series    7/08 at 101.00    AAA    6,133,080 
     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    3,096,120 
     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    5,778,013 
     Project, Series 2002A, 4.750%, 7/01/19 – FSA Insured             
37,460    Total Utilities            38,979,565 
    Water and Sewer – 17.8% (11.8% of Total Investments)             
3,000    California Department of Water Resources, Water System Revenue Bonds, Central Valley Project,    12/12 at 100.00    AAA    3,160,050 
     Series 2002X, 5.150%, 12/01/23 – FGIC Insured             
6,100    East Bay Municipal Utility District, Alameda and Contra Costa Counties, California, Water    6/11 at 100.00    AAA    6,287,026 
     System Subordinated Revenue Bonds, Series 2001, 5.000%, 6/01/26 – MBIA Insured             
9,000    Eastern Municipal Water District, California, Water and Sewerage System Revenue Certificates    7/11 at 100.00    AAA    9,224,820 
     of Participation, Series 2001B, 5.000%, 7/01/30 – FGIC Insured             
570    Healdsburg Public Financing Authority, California, Wastewater Revenue Bonds, Series 2006,    4/16 at 100.00    AAA    595,838 
     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    4,705,785 
     Capital Projects, Series 2003A, 5.000%, 10/01/23 – FSA Insured             
2,855    Manteca Financing Authority, California, Sewerage Revenue Bonds, Series 2003B, 5.000%,    12/13 at 100.00    Aaa    2,860,967 
     12/01/33 – MBIA Insured             
500    Marina Coast Water District, California, Enterprise Certificate of Participation, Series 2006,    6/16 at 100.00    AAA    523,800 
     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    9,506,842 
     5.000%, 2/01/33 – FGIC Insured             
870    Sacramento County Sanitation District Financing Authority, California, Revenue Bonds, Series    6/16 at 100.00    AAA    914,727 
     2006, 5.000%, 12/01/36 – 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    1,435,941 
1,415     5.500%, 12/01/21 – XLCA Insured    12/14 at 100.00    AAA    1,544,175 
750    Westlands Water District, California, Revenue Certificates of Participation, Series 2007A,    9/16 at 100.00    AAA    781,238 
     5.000%, 9/01/37 – MBIA Insured             
40,060    Total Water and Sewer            41,541,209 
$     341,610    Total Investments (cost $335,003,489) – 151.1%            352,725,187 
    Floating Rate Obligations – (2.1)%            (4,985,000) 
    Other Assets Less Liabilities – 1.6%            3,648,591 
    Preferred Shares, at Liquidation Value – (50.6)%            (118,000,000) 
    Net Assets Applicable to Common Shares – 100%           $   233,388,778 

Forward Swaps outstanding at May 31, 2007:                         
        Fund            Fixed Rate            Unrealized 
    Notional    Pay/Receive    Floating Rate    Fixed Rate    Payment    Effective    Termination    Appreciation 
Counterparty    Amount    Floating Rate    Index    (Annualized)    Frequency    Date (6)    Date    (Depreciation) 
Goldman Sachs    $7,500,000    Pay    3-Month USD-LIBOR    5.215%    Semi-Annually    3/12/08    3/12/30    $(365,825) 
USD-LIBOR (United States Dollar-London Inter-Bank Offered Rate)                     

    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, S&P or Fitch) or unrated but judged to be of 
    comparable quality by the Adviser. 
    The Fund may invest in “zero coupon” securities. A zero coupon security does not pay a regular 
    interest coupon to its holders during the life of the security. Tax-exempt income to the holder of 
    the security comes from accretion of the difference between the original purchase price of the 
    security at issuance and the par value of the security at maturity and is effectively paid at 
    maturity. Such securities are included in the portfolio with a 0.00% coupon rate in their 
    description. The market prices of zero coupon securities generally are more volatile than the 
    market prices of securities that pay interest periodically. 
(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 or Moody’s rating. Ratings below BBB by 
    Standard & Poor’s Group or Baa by Moody’s Investor Service, Inc. are considered to be below 
    investment grade. 
(4)    Portion of the investment, with an aggregate market value of $298,474, has been pledged to 
    collateralize the net payment obligations under forward swap contracts. 
(5)    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. 
(6)    Effective date represents the date on which both the Fund and counterparty commence interest 
    payment accruals on each forward swap contract. 
N/R    Not rated. 
(ETM)    Escrowed to maturity. 
(UB)    Underlying bond of an inverse floating rate trust reflected as a financing transaction pursuant 
    to the provisions of SFAS No. 140. 

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 the treatment of paydown gains and losses, 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.

At May 31, 2007, the cost of investments was $331,438,299.

Gross unrealized appreciation and gross unrealized depreciation of investments at May 31, 2007, were as follows:

Gross unrealized:     
  Appreciation    $18,176,394 
  Depreciation    (1,874,730) 
Net unrealized appreciation (depreciation) of investments    $16,301,664 

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

Date         July 27, 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 (Signature and Title)*         /s/ Gifford R. Zimmerman                    
                                                   Gifford R. Zimmerman
                                                   Chief Administrative Officer (principal executive officer) 

Date         July 27, 2007        

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

Date        July 27, 2007        

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