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         811-09161         

        Nuveen 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 California Dividend Advantage Municipal Fund (NAC)             
    May 31, 2007             
Principal        Optional Call         
Amount (000)    Description (1)    Provisions (2)    Ratings (3)    Value 
    Consumer Staples – 5.5% (3.7% of Total Investments)             
$          1,250    California County Tobacco Securitization Agency, Tobacco Settlement Asset-Backed Bonds, Sonoma    6/15 at 100.00    BBB   $  1,218,050 
     County Tobacco Securitization Corporation, Series 2005, 4.250%, 6/01/21             
24,265    Golden State Tobacco Securitization Corporation, California, Enhanced Tobacco Settlement    6/22 at 100.00    BBB    18,384,862 
     Asset-Backed Bonds, Series 2007A-2, 0.000%, 6/01/37             
25,515    Total Consumer Staples            19,602,912 
    Education and Civic Organizations – 2.3% (1.6% of Total Investments)             
290    California Educational Facilities Authority, Revenue Bonds, University of Redlands, Series 2005A,    10/15 at 100.00    A3    299,761 
     5.000%, 10/01/35             
    California Educational Facilities Authority, Revenue Bonds, University of the Pacific, Series 2006:             
200     5.000%, 11/01/21    11/15 at 100.00    A2    209,288 
265     5.000%, 11/01/25    11/15 at 100.00    A2    275,600 
615    California Statewide Community Development Authority, Revenue Bonds, Notre Dame de Namur    10/13 at 100.00    N/R    669,544 
     University, Series 2003, 6.500%, 10/01/23             
3,000    Long Beach Bond Financing Authority, California, Lease Revenue Refunding Bonds, Long Beach    11/11 at 100.00    AAA    3,209,250 
     Aquarium of the South Pacific, Series 2001, 5.500%, 11/01/17 – AMBAC Insured             
3,500    University of California, Revenue Bonds, Multi-Purpose Projects, Series 2003A, 5.125%, 5/15/17 –    5/13 at 100.00    AAA    3,729,670 
     AMBAC Insured             
7,870    Total Education and Civic Organizations            8,393,113 
    Health Care – 11.7% (7.9% of Total Investments)             
2,160    California Health Facilities Financing Authority, Health Facility Revenue Bonds, Adventist    3/13 at 100.00    A    2,230,610 
     Health System/West, Series 2003A, 5.000%, 3/01/15             
1,990    California Health Facilities Financing Authority, Revenue Bonds, Cedars-Sinai Medical Center,    11/15 at 100.00    A2    2,024,268 
     Series 2005, 5.000%, 11/15/34             
11,560    California Health Facilities Financing Authority, Revenue Bonds, Sutter Health, Series 2007A,    11/16 at 100.00    AA–    12,086,441 
     5.250%, 11/15/46             
1,535    California Statewide Communities Development Authority, Revenue Bonds, ValleyCare Health    7/17 at 100.00    N/R    1,537,318 
     System, Series 2007A, 5.125%, 7/15/31             
9,940    California Statewide Community Development Authority, Revenue Bonds, Kaiser Permanante System,    3/16 at 100.00    A+    10,058,684 
     Series 2006, 5.000%, 3/01/41             
3,095    California Statewide Community Development Authority, Revenue Bonds, Kaiser Permanente System,    8/16 at 100.00    A+    3,225,083 
     Series 2001C, 5.250%, 8/01/31             
10,500    Duarte, California, Certificates of Participation, City of Hope National Medical Center,    4/09 at 101.00    A–    10,739,715 
     Series 1999A, 5.250%, 4/01/31             
40,780    Total Health Care            41,902,119 
    Housing/Multifamily – 6.1% (4.1% of Total Investments)             
5,145    California Statewide Community Development Authority, GNMA Collateralized Housing Revenue    8/12 at 105.00    Aaa    5,728,289 
     Refunding Bonds, Crowne Pointe Project, Series 2002F, 6.750%, 8/20/37             
5,000    Contra Costa County, California, Multifamily Housing Revenue Bonds, Delta View Apartments    6/09 at 102.00    N/R    5,224,500 
     Project, Series 1999C, 6.750%, 12/01/30 (Alternative Minimum Tax)             
320    Independent Cities Lease Finance Authority, California, Mobile Home Park Revenue Bonds, San    5/16 at 100.00    N/R    329,171 
     Juan Mobile Estates, Series 2006B, 5.850%, 5/15/41             
1,725    Rohnert Park Finance Authority, California, Senior Lien Revenue Bonds, Rancho Feliz Mobile    9/13 at 100.00    A+    1,841,351 
     Home Park, Series 2003A, 5.750%, 9/15/38             
1,120    Rohnert Park Finance Authority, California, Subordinate Lien Revenue Bonds, Rancho Feliz    9/13 at 100.00    N/R    1,199,923 
     Mobile Home Park, Series 2003B, 6.625%, 9/15/38             
7,500    San Bernardino County Housing Authority, California, Multifamily Housing Revenue Refunding    No Opt. Call    A–    7,656,000 
     Bonds, Equity Residential Properties/Redlands Lawn and Tennis Apartments, Series 1999A,             
     5.200%, 6/15/29 (Mandatory put 6/15/09)             
20,810    Total Housing/Multifamily            21,979,234 
    Housing/Single Family – 0.3% (0.2% of Total Investments)             
845    California Housing Finance Agency, Home Mortgage Revenue Bonds, Series 2006H, 5.750%, 8/01/30 –    2/16 at 100.00    AAA    898,108 
     FGIC Insured (Alternative Minimum Tax)             
    Industrials – 0.6% (0.4% of Total Investments)             
2,000    California Pollution Control Financing Authority, Solid Waste Disposal Revenue Bonds, Waste    1/16 at 102.00    BBB    2,033,640 
     Management Inc., Series 2002A, 5.000%, 1/01/22 (Alternative Minimum Tax)             
    Long-Term Care – 2.4% (1.6% of Total Investments)             
8,500    Riverside County Public Financing Authority, California, Certificates of Participation, Air    5/09 at 101.00    BBB–    8,740,975 
     Force Village West, Series 1999, 5.800%, 5/15/29             
    Tax Obligation/General – 19.4% (13.0% of Total Investments)             
2,000    California, General Obligation Bonds, Series 2003, 5.250%, 11/01/19 – RAAI Insured    11/13 at 100.00    AA    2,134,360 
    California, General Obligation Bonds, Series 2004:             
5,000     5.125%, 4/01/23    4/14 at 100.00    A+    5,279,600 
4,150     5.125%, 4/01/25    4/14 at 100.00    A+    4,374,474 
    California, General Obligation Refunding Bonds, Series 2002:             
8,000     5.000%, 2/01/12    No Opt. Call    A+    8,380,400 
4,435     6.000%, 4/01/16 – AMBAC Insured    No Opt. Call    AAA    5,108,233 
5,000    Coast Community College District, Orange County, California, General Obligation Bonds, Series    8/16 at 100.00    AAA    5,299,500 
     2006B, 5.000%, 8/01/24 – FSA Insured             
5,000    Fresno Unified School District, Fresno County, California, General Obligation Bonds, Series    No Opt. Call    AAA    5,981,900 
     2002A, 6.000%, 8/01/26 – MBIA Insured             
10,000    Los Angeles Unified School District, Los Angeles County, California, General Obligation Bonds,    7/17 at 100.00    AAA    9,977,800 
     Series 2007B, 4.500%, 7/01/31 – AMBAC Insured             
5,210    Oak Valley Hospital District, Stanislaus County, California, General Obligation Bonds, Series    7/14 at 101.00    Aaa    5,415,118 
     2005, 5.000%, 7/01/35 – FGIC Insured             
1,750    Oakland Unified School District, Alameda County, California, General Obligation Bonds, Series    8/08 at 101.00    AAA    1,793,260 
     2001, 5.125%, 8/01/21 – FSA Insured             
575    Roseville Joint Union High School District, Placer County, California, General Obligation    8/15 at 100.00    AAA    604,664 
     Bonds, Series 2006B, 5.000%, 8/01/27 – FGIC Insured             
5,000    San Diego Unified School District, San Diego County, California, General Obligation Bonds,    7/13 at 101.00    AAA    5,403,200 
     Series 2003E, 5.250%, 7/01/20 – FSA Insured             
2,975    San Diego Unified School District, San Diego County, California, General Obligation Bonds,    7/16 at 101.00    AAA    2,968,723 
     Series 2006G-1, 4.500%, 7/01/29 – FSA Insured (UB)             
2,865    San Ramon Valley Unified School District, Contra Costa County, California, General Obligation    8/16 at 100.00    AAA    3,047,816 
     Bonds, Series 2006, 5.000%, 8/01/21 – MBIA Insured             
3,605    West Contra Costa Unified School District, Contra Costa County, California, General Obligation    8/11 at 101.00    AAA    3,774,147 
     Bonds, Series 2003B, 5.000%, 8/01/21 – FSA Insured             
65,565    Total Tax Obligation/General            69,543,195 
    Tax Obligation/Limited – 24.2% (16.3% of Total Investments)             
    Beaumont Financing Authority, California, Local Agency Revenue Bonds, Series 2004D:             
1,000     5.500%, 9/01/24    9/14 at 102.00    N/R    1,046,770 
615     5.800%, 9/01/35    9/14 at 102.00    N/R    653,604 
1,990    Brentwood Infrastructure Financing Authority, California, Infrastructure Revenue Refunding    9/12 at 100.00    AAA    2,088,266 
     Bonds, Series 2002A, 5.125%, 9/02/24 – FSA Insured             
    Brentwood Infrastructure Financing Authority, Contra Costa County, California, Capital Improvement             
    Revenue Bonds, Series 2001:             
1,110     5.375%, 11/01/18 – FSA Insured    11/11 at 100.00    AAA    1,176,955 
1,165     5.375%, 11/01/19 – FSA Insured    11/11 at 100.00    AAA    1,235,273 
3,895    California, Economic Recovery Revenue Bonds, Series 2004A, 5.000%, 7/01/15    7/14 at 100.00    AA+    4,154,095 
2,000    Capistrano Unified School District, Orange County, California, Special Tax Bonds, Community    9/13 at 100.00    N/R    2,113,180 
     Facilities District 90-2 – Talega, Series 2003, 6.000%, 9/01/33             
710    Capistrano Unified School District, Orange County, California, Special Tax Bonds, Community    9/15 at 100.00    AAA    746,934 
     Facilities District, Series 2005, 5.000%, 9/01/24 – FGIC Insured             
2,135    Chino Redevelopment Agency, California, Merged Chino Redevelopment Project Area Tax Allocation    9/16 at 101.00    AAA    2,245,935 
     Bonds, Series 2006, 5.000%, 9/01/38 – AMBAC Insured (UB)             
3,490    Fontana, California, Senior Special Tax Refunding Bonds, Heritage Village Community Facilities    9/08 at 102.00    AAA    3,625,447 
     District 2, Series 1998A, 5.250%, 9/01/17 – MBIA Insured             
1,125    Fontana, California, Special Tax Bonds, Sierra Community Facilities District 22, Series 2004,    9/14 at 100.00    N/R    1,192,961 
     6.000%, 9/01/34             
3,980    Garden Grove, California, Certificates of Participation, Financing Project, Series 2002A,    3/12 at 101.00    AAA    4,265,087 
     5.500%, 3/01/22 – AMBAC Insured             
2,850    Hesperia Community Redevelopment Agency, California, Tax Allocation Bonds, Series 2005A,    9/15 at 100.00    AAA    2,960,039 
     5.000%, 9/01/35 – XLCA Insured             
4,500    Inglewood Redevelopment Agency, California, Tax Allocation Refunding Bonds, Merged Area    No Opt. Call    AAA    4,991,670 
     Redevelopment Project, Series 1998A, 5.250%, 5/01/23 – AMBAC Insured             
    Irvine, California, Unified School District, Community Facilities District Special Tax Bonds,             
    Series 2006A:             
345     5.000%, 9/01/26    9/16 at 100.00    N/R    346,370 
795     5.125%, 9/01/36    9/16 at 100.00    N/R    803,689 
675    Lammersville School District, San Joaquin County, California, Community Facilities District    9/16 at 100.00    N/R    680,387 
     2002, Mountain House Special Tax Bonds, Series 2006, 5.125%, 9/01/35             
2,000    Lee Lake Water District, Riverside County, California, Special Tax Bonds, Community Facilities    9/13 at 102.00    N/R    2,206,120 
     District 1 of Sycamore Creek, Series 2003, 6.500%, 9/01/24             
1,290    Los Angeles Community Redevelopment Agency, California, Lease Revenue Bonds, Manchester Social    9/15 at 100.00    Aaa    1,340,710 
     Services Project, Series 2005, 5.000%, 9/01/37 – AMBAC Insured             
5,000    Los Angeles County Metropolitan Transportation Authority, California, Proposition C Second    7/08 at 101.00    AAA    5,098,850 
     Senior Lien Sales Tax Revenue Refunding Bonds, Series 1998A, 5.000%, 7/01/23 – AMBAC Insured             
1,000    Los Banos Redevelopment Agency, California, Project Tax Allocation Bonds, Los Banos    9/16 at 100.00    AA    1,027,130 
     Redevelopment Project, Series 2006, 5.000%, 9/01/36 – RAAI Insured             
1,530    Moreno Valley Unified School District, Riverside County, California, Certificates of    3/14 at 100.00    AAA    1,594,352 
     Participation, Series 2005, 5.000%, 3/01/24 – FSA Insured             
9,200    Norco Redevelopment Agency, California, Tax Allocation Refunding Bonds, Project Area 1, Series    3/11 at 102.00    AAA    9,631,756 
     2001, 5.000%, 3/01/19 – MBIA Insured             
    North Natomas Community Facilities District 4, Sacramento, California, Special Tax Bonds,             
    Series 2006D:             
550     5.000%, 9/01/26    9/14 at 102.00    N/R    556,254 
250     5.000%, 9/01/33    9/14 at 102.00    N/R    250,808 
3,290    Oakland Redevelopment Agency, California, Subordinate Lien Tax Allocation Bonds, Central    3/13 at 100.00    AAA    3,567,413 
     District Redevelopment Project, Series 2003, 5.500%, 9/01/16 – FGIC Insured             
5,600    Palm Springs Financing Authority, California, Lease Revenue Refunding Bonds, Convention Center    11/11 at 101.00    AAA    5,850,880 
     Project, Series 2001A, 5.000%, 11/01/22 – MBIA Insured             
1,000    Palmdale Community Redevelopment Agency, California, Tax Allocation Bonds, Merged    12/14 at 100.00    AAA    1,046,100 
     Redevelopment Project Areas, Series 2004, 5.000%, 12/01/24 – AMBAC Insured             
1,570    Poway Redevelopment Agency, California, Tax Allocation Refunding Bonds, Paguay Redevelopment    12/10 at 102.00    AAA    1,693,041 
     Project, Series 2000, 5.750%, 6/15/33 – MBIA Insured             
620    Rialto Redevelopment Agency, California, Tax Allocation Bonds, Merged Project Area, Series    9/15 at 100.00    AAA    643,938 
     2005A, 5.000%, 9/01/35 – XLCA Insured             
1,860    Riverside Redevelopment Agency, California, Tax Allocation Refunding Bonds, Merged Project    8/13 at 100.00    AAA    1,968,643 
     Areas, Series 2003, 5.250%, 8/01/22 – MBIA Insured             
770    Roseville, California, Certificates of Participation, Public Facilities, Series 2003A, 5.000%,    8/13 at 100.00    AAA    799,514 
     8/01/25 – AMBAC Insured             
2,500    Sacramento City Financing Authority, California, Lease Revenue Refunding Bonds, Series 1993A,    No Opt. Call    AAA    2,795,950 
     5.400%, 11/01/20 – AMBAC Insured             
1,150    Sacramento, California, Special Tax Bonds, North Natomas Community Facilities District 4,    9/14 at 100.00    N/R    1,220,185 
     Series 2003C, 6.000%, 9/01/33             
2,695    San Jose Financing Authority, California, Lease Revenue Refunding Bonds, Civic Center Project,    6/12 at 100.00    AAA    2,851,930 
     Series 2002B, 5.250%, 6/01/19 – AMBAC Insured             
1,590    San Marcos Public Facilities Authority, California, Special Tax Bonds, Community Facilities    9/09 at 102.00    N/R    1,657,114 
     District 99-1, Series 2003B, 6.000%, 9/01/24             
2,810    West Patterson Financing Authority, California, Special Tax Bonds, Community Facilities    9/13 at 103.00    N/R    3,180,695 
     District 01-1, Series 2003B, 7.000%, 9/01/38             
2,000    West Patterson Financing Authority, California, Special Tax Bonds, Community Facilities    9/13 at 102.00    N/R    2,131,580 
     District 01-1, Series 2004B, 6.000%, 9/01/39             
1,350    West Patterson Financing Authority, California, Special Tax Bonds, Community Facilities    9/13 at 103.00    N/R    1,460,282 
     District 2001-1, Series 2004A, 6.125%, 9/01/39             
82,005    Total Tax Obligation/Limited            86,899,907 
    Transportation – 18.9% (12.7% of Total Investments)             
1,430    Bay Area Toll Authority, California, Revenue Bonds, San Francisco Bay Area Toll Bridge, Series    4/16 at 100.00    AA    1,501,228 
     2006, 5.000%, 4/01/31             
8,150    Foothill/Eastern Transportation Corridor Agency, California, Toll Road Revenue Refunding    1/10 at 101.00    BBB–    8,484,313 
     Bonds, Series 1999, 5.750%, 1/15/40             
8,515    Los Angeles Harbors Department, California, Revenue Refunding Bonds, Series 2001B, 5.500%,    8/11 at 100.00    AAA    8,971,830 
     8/01/18 – AMBAC Insured (Alternative Minimum Tax)             
120    Palm Springs Financing Authority, California, Palm Springs International Airport Revenue    7/14 at 102.00    N/R    122,974 
     Bonds, Series 2006, 5.450%, 7/01/20 (Alternative Minimum Tax)             
23,000    Port of Oakland, California, Revenue Bonds, Series 2000K, 5.750%, 11/01/29 – FGIC Insured    5/10 at 100.00    AAA    24,106,529 
     (Alternative Minimum Tax)             
23,275    San Francisco Airports Commission, California, Revenue Bonds, San Francisco International    5/10 at 101.00    AAA    24,575,837 
     Airport, Second Series 2000, Issue 24A, 5.750%, 5/01/30 – FSA Insured (Alternative Minimum Tax)             
64,490    Total Transportation            67,762,711 
    U.S. Guaranteed – 41.1% (27.7% of Total Investments) (4)             
    California Department of Water Resources, Power Supply Revenue Bonds, Series 2002A:             
1,500     5.375%, 5/01/17 (Pre-refunded 5/01/12) – XLCA Insured    5/12 at 101.00    AAA    1,619,205 
9,750     5.125%, 5/01/18 (Pre-refunded 5/01/12)    5/12 at 101.00    Aaa    10,416,413 
15,000    California Health Facilities Financing Authority, Revenue Bonds, Cedars-Sinai Medical Center,    12/09 at 101.00    N/R (4)    16,033,199 
     Series 1999A, 6.125%, 12/01/30 (Pre-refunded 12/01/09)             
8,400    California Health Facilities Financing Authority, Revenue Bonds, Kaiser Permanente System,    10/08 at 101.00    AAA    8,658,552 
     Series 1998B, 5.250%, 10/01/14 (ETM)             
5,000    California Statewide Community Development Authority, Certificates of Participation, Pride    11/09 at 102.00    N/R (4)    5,507,250 
     Industries and Pride One Inc., Series 1999, 7.250%, 11/01/29 (Pre-refunded 11/01/09)             
8,000    Central California Joint Powers Health Finance Authority, Certificates of Participation, Community    2/10 at 101.00    AAA    8,498,480 
     Hospitals of Central California Obligated Group, Series 2000, 6.000%, 2/01/30             
     (Pre-refunded 2/01/10)             
5,200    Golden State Tobacco Securitization Corporation, California, Tobacco Settlement Asset-Backed    6/13 at 100.00    AAA    5,698,160 
     Bonds, Series 2003A-1, 6.250%, 6/01/33 (Pre-refunded 6/01/13)             
1,985    Lincoln, California, Special Tax Bonds, Lincoln Crossing Community Facilities District 03-1,    9/13 at 102.00    N/R (4)    2,282,512 
     Series 2003A, 6.500%, 9/01/25 (Pre-refunded 9/01/13)             
1,360    Lincoln, California, Special Tax Bonds, Lincoln Crossing Community Facilities District 03-1,    9/13 at 102.00    N/R (4)    1,526,614 
     Series 2004, 6.000%, 9/01/34 (Pre-refunded 9/01/13)             
2,555    Los Angeles County Public Works Financing Authority, California, Revenue Bonds, Regional Park    10/07 at 101.00    AA (4)    2,591,307 
     and Open Space District, Series 1997A, 5.000%, 10/01/16 (Pre-refunded 10/01/07)             
10,500    Los Angeles Unified School District, California, General Obligation Bonds, Series 1999C,    7/09 at 101.00    AAA    10,940,790 
     5.250%, 7/01/24 (Pre-refunded 7/01/09) – MBIA Insured             
10,845    Los Angeles Unified School District, California, General Obligation Bonds, Series 2002E,    7/12 at 100.00    AAA    11,453,947 
     5.000%, 7/01/19 (Pre-refunded 7/01/12) – MBIA Insured             
3,335    Moreno Valley Unified School District, Riverside County, California, General Obligation Bonds,    8/14 at 100.00    AAA    3,623,711 
     Series 2004A, 5.250%, 8/01/21 (Pre-refunded 8/01/14) – FSA Insured             
    Northern California Tobacco Securitization Authority, Tobacco Settlement Asset-Backed Bonds,             
    Series 2001A:             
2,500     5.250%, 6/01/31 (Pre-refunded 6/01/11)    6/11 at 100.00    AAA    2,634,775 
4,500     5.375%, 6/01/41 (Pre-refunded 6/01/11)    6/11 at 100.00    AAA    4,763,295 
5,840    Orange County Water District, California, Revenue Certificates of Participation, Series 1999A,    8/09 at 101.00    AA+ (4)    6,088,784 
     5.375%, 8/15/29 (ETM)             
4,000    Orange County Water District, California, Revenue Certificates of Participation, Series 1999A,    8/09 at 101.00    AA+ (4)    4,185,560 
     5.375%, 8/15/29 (Pre-refunded 8/15/09)             
6,530    Poway Redevelopment Agency, California, Tax Allocation Refunding Bonds, Paguay Redevelopment    12/10 at 102.00    Aaa    7,081,393 
     Project, Series 2000, 5.750%, 6/15/33 (Pre-refunded 12/15/10) – MBIA Insured             
4,000    Puerto Rico, General Obligation and Public Improvement Bonds, Series 2000, 5.750%, 7/01/16    7/10 at 100.00    AAA    4,227,760 
     (Pre-refunded 7/01/10) – MBIA Insured             
2,860    Tobacco Securitization Authority of Southern California, Tobacco Settlement Asset-Backed Bonds,    6/12 at 100.00    AAA    3,041,210 
     San Diego County Tobacco Asset Securitization Corporation, Senior Series 2001A, 5.250%, 6/01/27             
     (Pre-refunded 6/01/12)             
700    University of California, Certificates of Participation, San Diego and Sacramento Campus    1/10 at 101.00    Aa2 (4)    732,578 
     Projects, Series 2002A, 5.250%, 1/01/22 (Pre-refunded 1/01/10)             
    University of California, Revenue Bonds, Multi-Purpose Projects, Series 2002O:             
10,770     5.000%, 9/01/20 (Pre-refunded 9/01/10) – FGIC Insured    9/10 at 101.00    AAA    11,285,021 
11,305     5.000%, 9/01/21 (Pre-refunded 9/01/10) – FGIC Insured    9/10 at 101.00    AAA    11,845,605 
2,500    Whittier, California, Health Facility Revenue Bonds, Presbyterian Intercommunity Hospital,    6/12 at 101.00    A+ (4)    2,722,100 
     Series 2002, 5.600%, 6/01/22 (Pre-refunded 6/01/12)             
138,935    Total U.S. Guaranteed            147,458,221 
    Utilities – 7.6% (5.1% of Total Investments)             
3,630    Imperial Irrigation District, California, Certificates of Participation, Electric System    11/13 at 100.00    AAA    3,845,441 
     Revenue Bonds, Series 2003, 5.250%, 11/01/23 – FSA Insured             
7,000    Los Angeles Department of Water and Power, California, Power System Revenue Bonds, Series    7/11 at 100.00    AAA    7,315,630 
     2001A-1, 5.250%, 7/01/21 – FSA Insured             
8,370    Los Angeles Department of Water and Power, California, Power System Revenue Bonds, Series    7/11 at 100.00    AAA    8,826,751 
     2001A-2, 5.375%, 7/01/19 – MBIA Insured             
5,500    Los Angeles Department of Water and Power, California, Power System Revenue Bonds, Series    7/15 at 100.00    AAA    5,766,090 
     2005A-1, 5.000%, 7/01/31 – FSA Insured             
1,270    Merced Irrigation District, California, Electric System Revenue Bonds, Series 2005, 5.125%,    9/15 at 100.00    AAA    1,335,278 
     9/01/31 – XLCA Insured             
25,770    Total Utilities            27,089,190 
    Water and Sewer – 8.5% (5.7% of Total Investments)             
9,165    California Department of Water Resources, Water System Revenue Bonds, Central Valley Project,    12/11 at 100.00    AAA    9,640,205 
     Series 2001W, 5.250%, 12/01/22 – FSA Insured             
875    Healdsburg Public Financing Authority, California, Wastewater Revenue Bonds, Series 2006,    4/16 at 100.00    AAA    914,664 
     5.000%, 4/01/36 – MBIA Insured             
2,500    Indio Water Authority, California, Water Revenue Bonds, Series 2006, 5.000%, 4/01/31 –    4/16 at 100.00    AAA    2,630,150 
     AMBAC Insured             
835    Marina Coast Water District, California, Enterprise Certificate of Participation, Series 2006,    6/16 at 100.00    AAA    874,746 
     5.000%, 6/01/31 – MBIA Insured             
8,250    Pico Rivera Water Authority, California, Revenue Bonds, Series 2001A, 6.250%, 12/01/32    12/11 at 102.00    N/R    8,829,398 
2,250    Sacramento County Sanitation District Financing Authority, California, Revenue Bonds, Series    6/16 at 100.00    AAA    2,372,535 
     2006, 5.000%, 12/01/31 – FGIC Insured             
5,115    San Francisco City and County Public Utilities Commission, California, Water Revenue Bonds,    11/12 at 100.00    AAA    5,365,533 
     Series 2002A, 5.000%, 11/01/18 – MBIA Insured             
28,990    Total Water and Sewer            30,627,231 
$      512,075    Total Investments (cost $509,496,970) – 148.6%            532,930,556 
    Floating Rate Obligations – (0.9)%            (3,403,000) 
    Other Assets Less Liabilities – 1.1%            4,135,049 
    Preferred Shares, at Liquidation Value – (48.8)%            (175,000,000) 
    Net Assets Applicable to Common Shares – 100%           $   358,662,605 

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 (5)    Date    (Depreciation) 
JPMorgan    $44,000,000    Receive    3-Month USD-LIBOR    5.547%    Semi-Annually    7/10/07    7/10/11    $(345,848) 
JPMorgan    14,500,000    Pay    3-Month USD-LIBOR    5.813       Semi-Annually    7/10/07    7/10/27    363,081 
Morgan Stanley    24,500,000    Receive    3-Month USD-LIBOR    5.560       Semi-Annually    7/10/07    7/10/12    (223,919) 
Morgan Stanley    31,200,000    Pay    3-Month USD-LIBOR    5.691       Semi-Annually    7/10/07    7/10/37    341,131 
                                $ 134,445 
USD-LIBOR (United States Dollar-London Inter-Bank Offered Rate)                     

Futures Contracts outstanding at May 31, 2007:                 
                    Unrealized 
    Contract    Number of    Contract    Value at    Appreciation 
Type    Position    Contracts    Expiration    May 31, 2007    (Depreciation) 
U.S. 10-Year Treasury Notes    Long    49    9/07    $5,212,375    $(15,460) 

    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)    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)    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 $505,952,540.

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

Gross unrealized:     
  Appreciation    $24,011,771 
  Depreciation    (436,238) 
Net unrealized appreciation (depreciation) of investments    $23,575,533 

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 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.