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:             2/28          

Date of reporting period:          5/31/09         

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, 2009              
Principal         Optional Call          
Amount (000)     Description (1)     Provisions (2)     Ratings (3)     Value  
    Consumer Staples – 3.0% (2.0% of Total Investments)              
$       14,155     Golden State Tobacco Securitization Corporation, California, Enhanced Tobacco Settlement     6/22 at 100.00     BBB    $   6,330,541  
      Asset-Backed Bonds, Series 2007A-2, 0.000%, 6/01/37              
    Education and Civic Organizations – 5.1% (3.3% of Total Investments)              
1,675     California Educational Facilities Authority, Revenue Bonds, University of San Diego, Series     10/12 at 100.00     A2     1,684,028  
      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     Aa3     9,133,470  
      AMBAC Insured              
10,675     Total Education and Civic Organizations             10,817,498  
    Health Care – 6.4% (4.2% of Total Investments)              
5,000     ABAG Finance Authority for Non-Profit Corporations, California, Cal-Mortgage Insured Revenue     4/12 at 100.00     A     4,929,950  
      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     AA     2,848,864  
      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     1,621,925  
      System, Trust 2554, 18.389%, 7/01/47 – FSA Insured (IF)              
5,000     California Statewide Community Development Authority, Revenue Bonds, Kaiser Permanante System,     3/16 at 100.00     A+     4,338,000  
      Series 2006, 5.000%, 3/01/41              
14,563     Total Health Care             13,738,739  
    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     Baa1     927,320  
      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     7/11 at 102.00     AAA     1,956,092  
      Revenue Bonds, Park Plaza West Senior Apartments, Series 2001B, 5.300%, 1/20/21              
      (Alternative Minimum Tax)              
2,905     Total Housing/Multifamily             2,883,412  
    Housing/Single Family – 0.2% (0.1% of Total Investments)              
435     California Housing Finance Agency, Home Mortgage Revenue Bonds, Series 2006H, 5.750%,     2/16 at 100.00     Aa2     436,057  
      8/01/30 – FGIC Insured (Alternative Minimum Tax)              
    Industrials – 1.1% (0.7% of Total Investments)              
2,435     California Pollution Control Financing Authority, Solid Waste Disposal Revenue Bonds, Republic     No Opt. Call     BBB     2,243,439  
      Services Inc., Series 2002C, 5.250%, 6/01/23 (Mandatory put 12/01/17) (Alternative Minimum Tax)              
    Long-Term Care – 1.4% (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     2,935,740  
      Bonds, Odd Fellows Home of California, Series 2003A, 5.200%, 11/15/22              
    Tax Obligation/General – 27.8% (18.3% of Total Investments)              
5,920     Cajon Valley Union School District, San Diego County, California, General Obligation Bonds,     8/10 at 102.00     AA–     5,979,082  
      Series 2002B, 5.125%, 8/01/32 – MBIA Insured              
900     California, General Obligation Bonds, Series 2003, 5.000%, 2/01/21     8/13 at 100.00     A     910,539  
8,250     California, General Obligation Refunding Bonds, Series 2002, 5.000%, 2/01/22 – MBIA Insured     2/12 at 100.00     AA–     8,289,353  
3,375     Coast Community College District, Orange County, California, General Obligation Bonds, Series     8/18 at 100.00     AAA     2,777,929  
      2006C, 0.000%, 8/01/31 – FSA Insured              
230     El Monte Union High School District, Los Angeles County, California, General Obligation Bonds,     6/13 at 100.00     AAA     232,075  
      Series 2003A, 5.000%, 6/01/28 – FSA Insured              
2,730     Fontana Unified School District, San Bernardino County, California, General Obligation Bonds,     8/18 at 100.00     AAA     2,934,832  
      Trust 2668, 8.739%, 8/01/28 – FSA Insured (IF)              
10,000     Fremont Unified School District, Alameda County, California, General Obligation Bonds, Series     8/12 at 101.00     AA–     9,697,300  
      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     1,057,930  
      General Obligation Bonds, Series 2006C, 5.000%, 8/01/25 – FSA Insured (UB)              
1,500     Madera Unified School District, Madera County, California, General Obligation Bonds, Series     8/12 at 100.00     AAA     1,510,830  
      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     1,835,500  
      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     AA–     2,483,825  
      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–     380,944  
      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     3,522,708  
      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     3,551,135  
      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     10,284,997  
      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+     3,774,261  
      Series 2007C, 5.000%, 10/01/32 – SYNCORA GTY Insured              
59,435     Total Tax Obligation/General             59,223,240  
    Tax Obligation/Limited – 48.8% (32.1% of Total Investments)              
1,450     Baldwin Park Public Financing Authority, California, Sales Tax and Tax Allocation Bonds,     8/13 at 102.00     BBB     1,419,405  
      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     6,955,676  
      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     A     2,167,748  
      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–     2,780,390  
      Richmond Lab, Series 2005B, 5.000%, 11/01/30 – SYNCORA GTY Insured              
465     Capistrano Unified School District, Orange County, California, Special Tax Bonds, Community     9/15 at 100.00     AA–     434,780  
      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     A     1,142,106  
      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     AA–     7,082,697  
      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     AA–     2,656,015  
      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     A     8,759,240  
      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     A     3,861,040  
      5.000%, 9/01/21 – AMBAC Insured              
5,815     Golden State Tobacco Securitization Corporation, California, Enhanced Tobacco Settlement     6/15 at 100.00     AAA     4,983,846  
      Revenue Bonds, Drivers Trust 2091, 12.225%, 6/01/45 – AGC Insured (IF)              
8,780     Golden State Tobacco Securitization Corporation, California, Tobacco Settlement Asset-Backed     6/15 at 100.00     A     7,269,225  
      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     Baa1     939,471  
      Allocation Bonds, Series 2007A, 5.000%, 9/01/37 – SYNCORA GTY Insured              
2,115     Inglewood Redevelopment Agency, California, Tax Allocation Refunding Bonds, Merged Area     No Opt. Call     A     2,128,430  
      Redevelopment Project, Series 1998A, 5.250%, 5/01/23 – AMBAC Insured              
3,500     La Quinta Redevelopment Agency, California, Tax Allocation Bonds, Redevelopment Project     9/11 at 102.00     A+     3,155,215  
      Area 1, Series 2001, 5.100%, 9/01/31 – AMBAC Insured              
3,400     La Quinta Redevelopment Agency, California, Tax Allocation Bonds, Redevelopment Project     9/12 at 102.00     A     3,305,684  
      Area 1, 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     A2     760,179  
      Services Project, Series 2005, 5.000%, 9/01/37 – AMBAC Insured              
1,640     Los Angeles County Metropolitan Transportation Authority, California, Proposition C Second     7/09 at 100.00     AA+     1,643,018  
      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     AA–     1,441,911  
      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     AA–     7,076,370  
      AMBAC Insured              
8,470     Ontario Redevelopment Financing Authority, California, Lease Revenue Bonds, Capital Projects,     8/11 at 101.00     A     8,503,965  
      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     AA–     4,637,700  
      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     2,570,010  
      7/01/39 – FGIC Insured              
405     Rialto Redevelopment Agency, California, Tax Allocation Bonds, Merged Project Area, Series     9/15 at 100.00     A–     348,422  
      2005A, 5.000%, 9/01/35 – SYNCORA GTY Insured              
4,475     Riverside County, California, Asset Leasing Corporate Leasehold Revenue Bonds, Riverside     6/12 at 101.00     AA–     4,275,057  
      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     AA–     465,423  
      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     A     2,924,143  
      AMBAC Insured              
3,730     San Diego Redevelopment Agency, California, Subordinate Lien Tax Increment and Parking Revenue     9/09 at 101.00     Baa2     3,299,633  
      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     AA+     4,138,680  
      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     AA–     862,380  
      2005A, 5.000%, 8/01/28 – MBIA Insured              
2,160     Temecula Redevelopment Agency, California, Tax Allocation Revenue Bonds, Redevelopment     8/09 at 101.00     AA–     2,034,374  
      Project 1, Series 2002, 5.125%, 8/01/27 – MBIA Insured              
110,185     Total Tax Obligation/Limited             104,022,233  
    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–     6,149,700  
      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     AA–     2,188,955  
2,300       5.250%, 5/01/17 – FGIC Insured (Alternative Minimum Tax)     5/13 at 100.00     AA–     2,293,560  
11,985     Total Transportation             10,632,215  
    U.S. Guaranteed – 22.2% (14.6% 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     6,709,080  
      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     AAA     39,545  
      Series 2002X, 5.150%, 12/01/23 (Pre-refunded 12/01/12) – FGIC Insured              
2,250     California Infrastructure Economic Development Bank, First Lien Revenue Bonds, San Francisco     1/28 at 100.00     AAA     2,560,545  
      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)     9,756,900  
      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)     1,204,246  
1,190       5.125%, 8/01/24 – FGIC Insured (ETM)     8/10 at 102.00     A+ (4)     1,262,602  
1,245       5.125%, 8/01/25 – FGIC Insured (ETM)     8/10 at 102.00     A+ (4)     1,320,957  
1,255       5.125%, 8/01/26 – FGIC Insured (ETM)     8/10 at 102.00     A+ (4)     1,331,480  
2,070     Fresno Unified School District, Fresno County, California, General Obligation Bonds, Series     8/10 at 102.00     AAA     2,198,816  
      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     5,458,275  
      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     AA– (4)     5,573,100  
      5.125%, 1/01/27 (Pre-refunded 7/01/12) – MBIA Insured              
3,380     Rancho Mirage Joint Powers Financing Authority, California, Revenue Bonds, Eisenhower Medical     7/14 at 100.00     A3 (4)     4,024,194  
      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)     3,277,046  
      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     2,698,595  
      2002, 5.000%, 8/01/26 (Pre-refunded 8/01/11) – FSA Insured              
42,500     Total U.S. Guaranteed             47,415,381  
    Utilities – 15.1% (9.9% of Total Investments)              
9,000     Anaheim Public Finance Authority, California, Revenue Bonds, Electric System Distribution     10/12 at 100.00     AAA     9,059,850  
      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     AA–     9,964,000  
      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     1,991,950  
      2007A, 5.000%, 11/15/35              
830     Merced Irrigation District, California, Electric System Revenue Bonds, Series 2005, 5.125%,     9/15 at 100.00     BBB–     665,170  
      9/01/31 – SYNCORA GTY Insured              
1,775     Northern California Power Agency, Revenue Refunding Bonds, Hydroelectric Project 1, Series     7/10 at 100.00     A2     1,723,827  
      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     AA–     2,981,460  
      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     5,780,997  
      Project, Series 2002A, 4.750%, 7/01/19 – FSA Insured              
32,725     Total Utilities             32,167,254  
    Water and Sewer – 14.7% (9.7% of Total Investments)              
2,965     California Department of Water Resources, Water System Revenue Bonds, Central Valley Project,     12/12 at 100.00     AAA     3,093,444  
      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     721,838  
      10/01/36 – FSA Insured              
570     Healdsburg Public Financing Authority, California, Wastewater Revenue Bonds, Series 2006,     4/16 at 100.00     AA–     531,730  
      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     4,639,410  
      Capital Projects, Series 2003A, 5.000%, 10/01/23 – FSA Insured              
2,085     Manteca Financing Authority, California, Sewerage Revenue Bonds, Series 2003B, 5.000%,     12/13 at 100.00     A2     2,088,565  
      12/01/33 – MBIA Insured              
500     Marina Coast Water District, California, Enterprise Certificate of Participation, Series 2006,     6/16 at 100.00     AA–     467,110  
      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     9,201,533  
      5.000%, 2/01/33 – FGIC Insured (UB)              
8,000     San Diego County Water Authority, California, Water Revenue Certificates of Participation,     5/18 at 100.00     AAA     7,808,480  
      Series 2008A, 5.000%, 5/01/38 – FSA Insured              
    Semitropic Water Storage District, Kern County, California, Water Banking Revenue Bonds,              
    Series 2004A:              
1,315       5.500%, 12/01/20 – SYNCORA GTY Insured     12/14 at 100.00     A     1,390,113  
1,415       5.500%, 12/01/21 – SYNCORA GTY Insured     12/14 at 100.00     A     1,487,335  
31,285     Total Water and Sewer             31,429,558  
$       336,283     Total Investments (cost $327,934,819) – 152.1%             324,275,307  
    Floating Rate Obligations – (3.6)%             (7,635,000)
    Other Assets Less Liabilities – 2.3%             4,772,838  
    Auction Rate Preferred Shares, at Liquidation Value – (50.8)% (5)             (108,250,000)
    Net Assets Applicable to Common Shares – 100%           $   213,163,145  

Fair Value Measurements

During the current fiscal period, the Fund adopted the provisions of Statement of Financial Accounting Standards No. 157 (SFAS No. 157) “Fair Value Measurements.” SFAS No. 157 defines fair value, establishes a framework for measuring fair value in generally accepted accounting principles and expands disclosure about fair value measurements. In determining the value of the Fund’s investments various inputs are used. These inputs are summarized in the three broad levels listed below:

Level 1 – Quoted prices in active markets for identical securities.

Level 2 – Other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.).

Level 3 – Significant unobservable inputs (including management’s assumptions in determining the fair value of investments).

The inputs or methodology used for valuing securities are not an indication of the risk associated with investing in those securities. The following is a summary of the Fund’s fair value measurements as of May 31, 2009:

    Level 1     Level 2     Level 3     Total  
Investments     $ —     $324,275,307     $ —     $324,275,307  

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 Statement of Financial Accounting Standards No. 140 (SFAS No. 140), if any. 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, 2009, the cost of investments was $320,088,292.

Gross unrealized appreciation and gross unrealized depreciation of investments at May 31, 2009, were as follows:

Gross unrealized:      
  Appreciation     $ 11,810,383  
  Depreciation     (15,261,526)
Net unrealized appreciation (depreciation) of investments     $  (3,451,143)

    At least 80% of the Fund’s net assets (including net assets attributable to Auction Rate Preferred shares)  
    are invested in municipal securities that guarantee the timely payment of principal and interest.  
(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 whose insurer has experienced downgrades  
    as of the end of the reporting period. Subsequent to the reporting period, 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)     Auction Rate Preferred Shares, at Liquidation Value as a percentage of Total Investments is 33.4%  
(ETM)     Escrowed to maturity.  
(IF)     Inverse floating rate investment.  
(UB)     Underlying bond of an inverse floating rate trust reflected as a financing transaction pursuant to the provisions  
    of SFAS No. 140.  

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 30, 2009        

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 30, 2009        

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

Date         July 30, 2009        

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