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         811-10197         

        Nuveen California Dividend Advantage Municipal Fund 2         
(Exact name of registrant as specified in charter)


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


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

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

Date of fiscal year end:            08/31          

Date of reporting period:          05/31/05         

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

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

Item 1. Schedule of Investments

                   Portfolio of Investments (Unaudited)                 
 
    Nuveen California Dividend Advantage Municipal Fund 2 (NVX)                 
                   May 31, 2005                 
 
 
 
 
Principal            Optional Call        Market 
Amount (000)    Description(1)        Provisions*    Ratings**    Value 
 
    Consumer Staples - 6.0% (4.1% of Total Investments)                 
$ 4,625    California County Tobacco Securitization Agency, Tobacco Settlement Asset-Backed Bonds, Stanislaus    6/12 at 100.00    Baa3    $ 4,591,053 
    County Tobacco Funding Corporation, Series 2002A, 5.500%, 6/01/33                 
3,200    Golden State Tobacco Securitization Corporation, California, Tobacco Settlement Asset-Backed Bonds,    6/13 at 100.00    BBB    3,392,928 
    Series 2003A-1, 6.250%, 6/01/33                 
3,000    Northern California Tobacco Securitization Authority, Tobacco Settlement Asset-Backed Bonds, Series    6/11 at 100.00    BBB    2,934,600 
    2001A, 5.375%, 6/01/41                 
2,800    Southern California Tobacco Securitization Authority, Tobacco Settlement Asset-Backed Bonds, Senior    6/12 at 100.00    BBB    2,807,252 
    Series 2001A, 5.500%, 6/01/36                 
 
    Education and Civic Organizations - 14.9% (10.2% of Total Investments)                 
2,000    California Educational Facilities Authority, Revenue Bonds, Stanford University, Series 2001Q,    6/11 at 101.00    AAA    2,145,420 
    5.250%, 12/01/32                 
6,375    California Educational Facilities Authority, Student Loan Revenue Bonds, Cal Loan Program, Series    3/08 at 102.00    Aaa    6,718,485 
    2001A, 5.400%, 3/01/21 (Alternative Minimum Tax) - MBIA Insured                 
    California State Public Works Board, Lease Revenue Bonds, University of California System, Series             
    2002A:                 
8,880    5.375%, 10/01/16 - FSA Insured        10/12 at 100.00    AAA    9,824,210 
10,570    5.375%, 10/01/18 - FSA Insured        10/12 at 100.00    AAA    11,629,748 
620    California Statewide Community Development Authority, Revenue Bonds, Notre Dame de Namur    10/13 at 100.00    N/R    642,704 
    University, Series 2003, 6.500%, 10/01/23                 
3,000    Long Beach Bond Financing Authority, California, Lease Revenue Refunding Bonds, Long Beach Aquarium    11/11 at 101.00    AAA    3,213,300 
    of the South Pacific, Series 2001, 5.250%, 11/01/30 - AMBAC Insured                 
 
    Healthcare - 8.7% (5.9% of Total Investments)                 
2,000    California Health Facilities Financing Authority, Revenue Bonds, Casa Colina Inc., Series 2001,    4/12 at 100.00    BBB+    2,156,980 
    6.000%, 4/01/22                 
500    California Infrastructure Economic Development Bank, Revenue Bonds, Kaiser Hospital Assistance LLC,    8/11 at 102.00    A+    536,740 
    Series 2001A, 5.550%, 8/01/31                 
955    California State Public Works Board, Revenue Bonds, University of California - Davis Medical    11/14 at 100.00    AAA    1,021,936 
    Center, Series 2004II-A, 5.000%, 11/01/22 - MBIA Insured                 
    California Statewide Community Development Authority, Revenue Bonds, Daughters of Charity Health             
    System, Series 2005A:                 
330    5.250%, 7/01/24        7/15 at 100.00    BBB+    349,460 
190    5.250%, 7/01/35        7/15 at 100.00    BBB+    198,789 
5,355    California Statewide Community Development Authority, Revenue Bonds, Kaiser Permanente System,    No Opt. Call    A+    5,596,564 
    Series 2002E, 4.700%, 11/01/36 (Mandatory put 5/31/09)                 
2,185    California Statewide Community Development Authority, Health Facility Revenue Refunding Bonds,    No Opt. Call    A    2,476,195 
    Memorial Health Services, Series 2003A, 6.000%, 10/01/11                 
2,500    California Statewide Community Development Authority, Hospital Revenue Bonds, Monterey Peninsula    6/13 at 100.00    AAA    2,736,325 
    Hospital, Series 2003B, 5.250%, 6/01/18 - FSA Insured                 
3,000    Central California Joint Powers Health Finance Authority, Certificates of Participation, Community    2/10 at 101.00    Baa2    3,159,090 
    Hospitals of Central California Obligated Group, Series 2000, 6.000%, 2/01/30                 
1,500    Whittier, California, Health Facility Revenue Bonds, Presbyterian Intercommunity Hospital, Series    6/12 at 101.00    A    1,615,770 
    2002, 5.600%, 6/01/22                 
 
    Housing/Multifamily - 7.3% (4.9% of Total Investments)                 
2,450    ABAG Finance Authority for Non-Profit Corporations, California, Multifamily Housing Revenue    No Opt. Call    Baa2    2,628,630 
    Refunding Bonds, United Dominion/2000 Post Apartments, Series 2000B, 6.250%, 8/15/30 (Mandatory             
    put 8/15/08)                 
3,750    California Statewide Community Development Authority, Revenue Refunding Bonds, Irvine Apartment    7/08 at 101.00    BBB    3,889,500 
    Communities Development, Series 1998A, 4.900%, 5/15/25 (Mandatory put 5/15/08)                 
5,962    California Statewide Community Development Authority, Multifamily Housing Revenue Refunding Bonds,    6/11 at 102.00    AAA    6,154,573 
    Claremont Village Apartments, Series 2001D, 5.500%, 6/01/31 (Alternative Minimum Tax) (Mandatory             
    put 6/01/16)                 
3,490    California Statewide Community Development Authority, GNMA Collateralized Housing Revenue Refunding    8/12 at 105.00    Aaa    3,929,286 
    Bonds, Crowne Pointe Project, Series 2002F, 6.750%, 8/20/37                 
 
    Housing/Single Family - 0.6% (0.4% of Total Investments)                 
1,405    California Rural Home Mortgage Finance Authority, Mortgage-Backed Securities Program Single Family    6/11 at 102.00    AAA    1,471,499 
    Mortgage Revenue Bonds, Series 2001A, 5.650%, 12/01/31 (Alternative Minimum Tax)                 
 
    Long-Term Care - 0.7% (0.5% of Total Investments)                 
1,550    California Health Facilities Financing Authority, Insured Revenue Bonds, Northern California    1/13 at 100.00    A    1,634,506 
    Retired Officers Community Corporation - Paradise Valley Estates, Series 2002, 5.125%, 1/01/22             
 
    Tax Obligation/General - 30.0% (20.4% of Total Investments)                 
5,000    California, General Obligation Refunding Bonds, Series 2002, 5.000%, 2/01/12        No Opt. Call    A    5,469,050 
7,225    California, General Obligation Veterans Welfare Bonds, Series 2001BV, 5.600%, 12/01/32 - FSA    6/06 at 101.00    AAA    7,454,177 
    Insured                 
    California, General Obligation Bonds, Series 2003:                 
3,000    5.250%, 2/01/20        8/13 at 100.00    A    3,308,550 
1,400    5.250%, 2/01/21        8/13 at 100.00    A    1,539,034 
1,350    California, General Obligation Bonds, Series 2004, 5.125%, 4/01/25        4/14 at 100.00    A    1,441,800 
3,615    Colton Joint Unified School District, San Bernardino County, California, General Obligation Bonds,    8/12 at 102.00    AAA    4,113,617 
    Series 2002A, 5.500%, 8/01/22 - FGIC Insured                 
    Contra Costa County Community College District, California, General Obligation Bonds, Series 2002:             
3,005    5.000%, 8/01/21 - FGIC Insured        8/12 at 100.00    AAA    3,198,191 
3,300    5.000%, 8/01/22 - FGIC Insured        8/12 at 100.00    AAA    3,512,157 
1,325    Golden West Schools Financing Authority, California, General Obligation Revenue Refunding Bonds,    No Opt. Call    AAA    1,622,542 
    School District Program, Series 1998A, 6.650%, 8/01/13 - MBIA Insured                 
1,445    Los Angeles Community College District, Los Angeles County, California, General Obligation Bonds,    8/15 at 100.00    AAA    1,551,540 
    Series 2005A, 5.000%, 6/01/26 - FSA Insured                 
8,330    Los Angeles Unified School District, California, General Obligation Bonds, Series 2000D, 5.375%,    7/10 at 100.00    AAA    8,966,912 
    7/01/25 - FGIC Insured                 
10,840    Los Angeles Unified School District, California, General Obligation Bonds, Series 2002E,    5.000%,    7/12 at 100.00    AAA    11,763,460 
    7/01/19 - MBIA Insured                 
1,250    Los Angeles Unified School District, California, General Obligation Bonds, Series 2003A,    5.250%,    7/13 at 100.00    AAA    1,388,875 
    7/01/20 - FSA Insured                 
1,375    Lucia Mar Unified School District, San Luis Obispo County, California, General Obligation Bonds,    8/14 at 100.00    Aaa    1,521,864 
    Series 2004A, 5.250%, 8/01/21 - FGIC Insured                 
2,000    Puerto Rico, General Obligation and Public Improvement Bonds, Series 2001A, 5.500%, 7/01/20 - MBIA    No Opt. Call    AAA    2,383,720 
    Insured                 
    San Jose-Evergreen Community College District, Santa Clara County, California, General Obligation             
    Bonds, Series 2005A:                 
370    5.000%, 9/01/25 - MBIA Insured        9/15 at 100.00    AAA    398,420 
545    5.000%, 9/01/27 - MBIA Insured        9/15 at 100.00    AAA    584,027 
4,050    Santa Rosa High School District, Sonoma County, California, General Obligation Bonds, Series 2001,    5/11 at 101.00    AAA    4,385,786 
    5.300%, 5/01/26 - FGIC Insured                 
1,160    Saugus Union School District, Los Angeles County, California, General Obligation Bonds, Series    8/12 at 100.00    AAA    1,234,576 
    2002A, 5.000%, 8/01/21 - FGIC Insured                 
2,710    Southwestern Community College District, San Diego County, California, General Obligation Bonds,    8/14 at 100.00    AAA    2,925,824 
    Series 2004, 5.000%, 8/01/21 - FGIC Insured                 
 
    Tax Obligation/Limited - 44.3% (30.1% of Total Investments)                 
9,000    Anitoch Area Public Facilities Financing Agency, California, Special Tax Bonds, Community    8/11 at 100.00    AAA    9,639,360 
    Facilities District 1989-1, Series 2001, 5.250%, 8/01/25 - MBIA Insured                 
    Beaumont Financing Authority, California, Local Agency Revenue Bonds, Series 2004D:                 
650    5.500%, 9/01/24        9/14 at 102.00    N/R    663,338 
385    5.800%, 9/01/35        9/14 at 102.00    N/R    394,071 
4,500    California, Economic Recovery Revenue Bonds, Series 2004A, 5.000%, 7/01/15        7/14 at 100.00    AA-    4,967,775 
4,900    California State Public Works Board, Lease Revenue Bonds, Department of Corrections, Series 2003C,    12/13 at 100.00    A-    5,487,020 
    5.500%, 6/01/16                 
1,200    Capistrano Unified School District, Orange County, California, Special Tax Bonds, Community    9/13 at 100.00    N/R    1,287,324 
    Facilities District 90-2 - Talega, Series 2003, 6.000%, 9/01/33                 
4,000    Daly City Housing Development Finance Agency, California, Mobile Home Park Revenue Bonds,    12/13 at 102.00    A-    4,190,960 
    Franciscan Mobile Home Park Project, Series 2002A, 5.850%, 12/15/32                 
4,845    Encinitas Public Financing Authority, California, Lease Revenue Bonds, Acquisition Project, Series    4/08 at 102.00    AAA    5,152,609 
    2001A, 5.250%, 4/01/31 - MBIA Insured                 
750    Fontana, California, Special Tax Bonds, Sierra Community Facilities District 22, Series 2004,    9/14 at 100.00    N/R    776,003 
    6.000%, 9/01/34                 
335    Hesperia Community Redevelopment Agency, California, Tax Allocation Bonds, Series 2005A, 5.000%,    9/15 at 100.00    AAA    361,897 
    9/01/20 (WI, settling 6/07/05) - XLCA Insured                 
4,000    Industry Urban Development Agency, California, Tax Allocation Refunding Bonds, Civic, Recreational    5/07 at 101.50    AAA    4,238,000 
    and Industrial Redevelopment Project 1, Series 2002, 5.500%, 5/01/19 - MBIA Insured                 
2,000    Lake Elsinore Public Financing Authority, California, Local Agency Revenue Refunding Bonds, Series    10/13 at 102.00    N/R    2,101,720 
    2003H, 6.000%, 10/01/20                 
1,265    Lee Lake Water District, Riverside County, California, Special Tax Bonds, Community Facilities    9/13 at 102.00    N/R    1,376,801 
    District 1 of Sycamore Creek, Series 2003, 6.500%, 9/01/24                 
1,320    Lincoln, California, Special Tax Bonds, Lincoln Crossing Community Facilities District 03-1, Series    9/13 at 102.00    N/R    1,428,148 
    2003A, 6.500%, 9/01/25                 
1,000    Lincoln, California, Special Tax Bonds, Lincoln Crossing Community Facilities District 03-1, Series    9/13 at 102.00    N/R    1,045,460 
    2004, 6.000%, 9/01/34                 
8,000    Los Angeles County Metropolitan Transportation Authority, California, Proposition C Second Senior    7/08 at 101.00    AAA    8,419,520 
    Lien Sales Tax Revenue Refunding Bonds, Series 1998A, 5.000%, 7/01/23 - AMBAC Insured             
5,000    Los Angeles County Metropolitan Transportation Authority, California, Proposition C Second Senior    No Opt. Call    AAA    5,643,150 
    Lien Sales Tax Revenue Refunding Bonds, Series 2003A, 5.250%, 7/01/13 - MBIA Insured             
3,295    Oakland Redevelopment Agency, California, Subordinate Lien Tax Allocation Bonds, Central District    3/13 at 100.00    AAA    3,692,443 
    Redevelopment Project, Series 2003, 5.500%, 9/01/16 - FGIC Insured                 
2,000    Orange County, California, Special Tax Bonds, Community Facilities District 02-1 of Ladera Ranch,    8/11 at 101.00    N/R    2,076,120 
    Series 2003A, 5.550%, 8/15/33                 
2,000    Puerto Rico Public Finance Corporation, Commonwealth Appropriation Bonds, Series 2002E, 6.000%,    No Opt. Call    BBB-    2,461,300 
    8/01/26                 
6,000    Riverside County Redevelopment Agency, California, Tax Allocation Bonds, Jurupa Valley Project    10/11 at 102.00    AAA    6,454,680 
    Area, Series 2001, 5.250%, 10/01/35 - AMBAC Insured                 
1,055    Rohnert Park Finance Authority, California, Senior Lien Revenue Bonds, Rancho Feliz Mobile Home    9/13 at 100.00    BBB    1,071,922 
    Park, Series 2003A, 5.750%, 9/15/38                 
700    Rohnert Park Finance Authority, California, Subordinate Lien Revenue Bonds, Rancho Feliz Mobile    9/13 at 100.00    N/R    734,916 
    Home Park, Series 2003B, 6.625%, 9/15/38                 
700    Sacramento, California, Special Tax Bonds, North Natomas Community Facilities District 4, Series    9/14 at 100.00    N/R    747,796 
    2003C, 6.000%, 9/01/33                 
975    San Marcos Public Facilities Authority, California, Special Tax Bonds, Community Facilities    9/09 at 102.00    N/R    1,013,181 
    District 99-1, Series 2003B, 6.000%, 9/01/24                 
    Santa Clara Valley Transportation Authority, California, Sales Tax Revenue Bonds, Series 2001A:             
16,090    5.000%, 6/01/25 - MBIA Insured        6/11 at 100.00    AAA    16,993,453 
2,000    5.000%, 6/01/26 - MBIA Insured        6/11 at 100.00    AAA    2,096,520 
1,930    West Patterson Financing Authority, California, Special Tax Bonds, Community Facilities District    9/13 at 103.00    N/R    2,096,385 
    01-1, Series 2003B, 6.750%, 9/01/30                 
850    West Patterson Financing Authority, California, Special Tax Bonds, Community Facilities District    9/13 at 103.00    N/R    883,193 
    2001-1, Series 2004A, 6.125%, 9/01/39                 
500    West Patterson Financing Authority, California, Special Tax Bonds, Community Facilities District    9/13 at 102.00    N/R    512,835 
    01-1, Series 2004B, 6.000%, 9/01/39                 
3,045    Yucaipa Redevelopment Agency, California, Mobile Home Park Revenue Bonds, Rancho del Sol and    5/11 at 102.00    N/R    3,311,681 
    Grandview, Series 2001A, 6.750%, 5/15/36                 
 
    Transportation - 8.9% (6.1% of Total Investments)                 
7,000    Foothill/Eastern Transportation Corridor Agency, California, Toll Road Revenue Refunding Bonds,    1/14 at 101.00    BBB-    5,946,080 
    Series 1999, 0.000%, 1/15/27                 
5,585    Port of Oakland, California, Revenue Bonds, Series 2002N, 5.000%, 11/01/16 (Alternative Minimum    11/12 at 100.00    AAA    5,949,421 
    Tax) - MBIA Insured                 
2,000    San Francisco Airports Commission, California, Revenue Refunding Bonds, San Francisco International    5/12 at 100.00    AAA    2,140,340 
    Airport, Second Series 2002, Issue 28A, 5.250%, 5/01/17 (Alternative Minimum Tax) - MBIA Insured             
    San Francisco Airports Commission, California, Revenue Bonds, San Francisco International Airport,             
    Second Series 2003, Issue 29A:                 
2,430    5.250%, 5/01/18 (Alternative Minimum Tax) - FGIC Insured        5/13 at 100.00    AAA    2,612,955 
2,555    5.250%, 5/01/19 (Alternative Minimum Tax) - FGIC Insured        5/13 at 100.00    AAA    2,742,026 
1,000    San Francisco Airports Commission, California, Revenue Bonds, San Francisco International Airport,    5/13 at 100.00    AAA    1,090,180 
    Second Series 2003, Issue 29B, 5.125%, 5/01/17 - FGIC Insured                 
 
    U.S. Guaranteed *** - 3.1% (2.1% of Total Investments)                 
6,200    Southwestern Community College District, San Diego County, California, General Obligation Bonds,    8/11 at 101.00    AAA    7,034,210 
    Series 2001, 5.375%, 8/01/25 (Pre-refunded to 8/01/11) - AMBAC Insured                 
 
    Utilities - 8.8% (6.0% of Total Investments)                 
5,000    Anaheim Public Finance Authority, California, Second Lien Electric Distribution Revenue Bonds,    10/14 at 100.00    AAA    5,517,400 
    Series 2004, 5.250%, 10/01/21 - MBIA Insured                 
6,000    California Department of Water Resources, Power Supply Revenue Bonds, Series 2002A,    5.125%,    5/12 at 101.00    A2    6,466,740 
    5/01/18                 
    Los Angeles Department of Water and Power, California, Power System Revenue Bonds, Series 2003A-2:             
750    5.000%, 7/01/21 - MBIA Insured        7/13 at 100.00    AAA    813,360 
1,000    5.000%, 7/01/23 - MBIA Insured        7/13 at 100.00    AAA    1,078,270 
3,000    Merced Irrigation District, California, Revenue Refunding Bonds, Electric System Project, Series    9/05 at 102.00    Baa3    3,075,090 
    2001, 6.850%, 9/01/36                 
1,000    Merced Irrigation District, California, Revenue Certificates of Participation, Electric System        9/05 at 103.00    Baa3    1,034,520 
    Project, Series 2002, 6.500%, 9/01/34                 
2,000    Santa Clara, California, Subordinate Electric Revenue Bonds, Series 2003A, 5.250%, 7/01/20 - MBIA    7/13 at 100.00    AAA    2,222,200 
    Insured                 
 
    Water and Sewer - 13.6% (9.3% of Total Investments)                 
2,740    California Department of Water Resources, Water System Revenue Bonds, Central Valley Project,    12/12 at 100.00    AAA    2,985,477 
    Series 2002Z, 5.000%, 12/01/18 - FGIC Insured                 
4,900    East Bay Municipal Utility District, Alameda and Contra Costa Counties, California, Water System    6/11 at 100.00    AAA    5,136,474 
    Subordinated Revenue Bonds, Series 2001, 5.000%, 6/01/26 - MBIA Insured                 
2,655    El Dorado Irrigation District, California, Water and Sewer Certificates of Participation, Series    3/14 at 100.00    AAA    2,858,373 
    2004A, 5.000%, 3/01/20 - FGIC Insured                 
1,700    San Buenaventura, California, Wastewater Revenue Certificates of Participation, Series 2004,    3/14 at 100.00    AAA    1,810,789 
    5.000%, 3/01/24 - MBIA Insured                 
6,885    San Diego Public Facilities Financing Authority, California, Subordinate Lien Water Revenue Bonds,    8/12 at 100.00    AAA    7,327,635 
    Series 2002, 5.000%, 8/01/21 - MBIA Insured                 
10,000    San Francisco City and County Public Utilities Commission, California, Clean Water Revenue    4/13 at 100.00    AAA    11,081,100 
    Refunding Bonds, Series 2003A, 5.250%, 10/01/20 - MBIA Insured                 

$ 314,177    Total Long-Term Investments (cost $317,999,944) - 146.9%    336,461,886 
 
    Other Assets Less Liabilities - 1.1%    2,508,572 
 
    Preferred Shares, at Liquidation Value - (48.0)%    (110,000,000) 
 
    Net Assets Applicable to Common Shares - 100%    $228,970,458 
 
 
 
(1)    All percentages shown in the Portfolio of Investments are based on net assets applicable to Common shares     
    unless otherwise noted.     
*    Optional Call Provisions: Dates (month and year) and prices of the earliest optional call or redemption. There     
    may be other call provisions at varying prices at later dates.     
**    Ratings: Using the higher of Standard & Poor's or Moody's rating.     
***    Securities are backed by an escrow or trust containing sufficient U.S. Government or U.S. Government agency     
    securities which ensures the timely payment of principal and interest.     
N/R    Investment is not rated.     
(WI)    Security purchased on a when-issued basis.     
 
    Income Tax Information     
 
    The following information is presented on an income tax basis. Differences between amounts for financial statement     
    and federal income tax purposes are primarily due to timing differences in recognizing income on taxable market     
    discount securities and timing differences in recognizing certain gains and losses on investment transactions.     
 
    At May 31, 2005, the cost of investments was $317,989,156.     
 
    Gross unrealized appreciation and gross unrealized depreciation of investments at May 31, 2005, were as     
    follows:     
 
    Gross unrealized:     
       Appreciation    $18,562,881 
       Depreciation    (90,151) 
 
    Net unrealized appreciation of investments    $18,472,730 

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 2        

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

Date         07/29/05        

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

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

Date         07/29/05        

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

Date         07/29/05        

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