nq2.htm



 
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 811-6623
 
Nuveen California Select Tax-Free Income Portfolio
(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:            3/31          
 
Date of reporting period:         12/31/11         
 
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 Select Tax-Free Income Portfolio (NXC) 
      
   
December 31, 2011 
      
           
Principal 
    
Optional Call 
    
Amount (000) 
  
Description (1) 
Provisions (2) 
Ratings (3) 
Value 
   
Consumer Staples – 4.2% 
      
$    150 
  
California County Tobacco Securitization Agency, Tobacco Settlement Asset-Backed Bonds, Sonoma 
6/15 at 100.00 
BBB 
$    140,777 
   
County Tobacco Securitization Corporation, Series 2005, 4.250%, 6/01/21 
      
1,015 
  
California County Tobacco Securitization Agency, Tobacco Settlement Asset-Backed Revenue 
6/12 at 100.00 
A3 
1,015,152 
   
Bonds, Fresno County Tobacco Funding Corporation, Series 2002, 5.625%, 6/01/23 
      
1,065 
  
Golden State Tobacco Securitization Corporation, California, Tobacco Settlement Asset-Backed 
6/17 at 100.00 
BB+ 
769,356 
   
Bonds, Series 2007A-1, 5.750%, 6/01/47 
      
2,980 
  
Golden State Tobacco Securitization Corporation, California, Tobacco Settlement Asset-Backed 
6/22 at 100.00 
BB– 
1,912,057 
   
Bonds, Series 2007A-2, 0.000%, 6/01/37 
      
5,210 
  
Total Consumer Staples 
    
3,837,342 
   
Education and Civic Organizations – 6.2% 
      
3,000 
  
California Educational Facilities Authority, Revenue Bonds, Santa Clara University, Series 
4/18 at 100.00 
Aa3 
3,308,130 
   
2008A, 5.625%, 4/01/37 
      
45 
  
California Educational Facilities Authority, Revenue Bonds, University of Redlands, Series 
10/15 at 100.00 
A3 
45,310 
   
2005A, 5.000%, 10/01/35 
      
1,000 
  
California Educational Facilities Authority, Revenue Bonds, University of San Diego, Series 
10/12 at 100.00 
A2 
1,011,880 
   
2002A, 5.500%, 10/01/32 
      
   
California Educational Facilities Authority, Revenue Bonds, University of the Pacific, 
      
   
Series 2006: 
      
35 
  
5.000%, 11/01/21 
11/15 at 100.00 
A2 
37,637 
45 
  
5.000%, 11/01/25 
11/15 at 100.00 
A2 
47,245 
250 
  
California Statewide Communitities Development Authority, School Facility Revenue Bonds, 
7/21 at 100.00 
N/R 
251,375 
   
Alliance College-Ready Public Schools, Series 2011A, 7.000%, 7/01/46 
      
1,000 
  
Long Beach Bond Financing Authority, California, Lease Revenue Refunding Bonds, Long Beach 
5/12 at 101.00 
BBB 
1,000,690 
   
Aquarium of the South Pacific, Series 2001, 5.250%, 11/01/30 – AMBAC Insured 
      
5,375 
  
Total Education and Civic Organizations 
    
5,702,267 
   
Health Care – 12.7% 
      
235 
  
California Health Facilities Financing Authority, Revenue Bonds, Rady Children’s Hospital – 
8/21 at 100.00 
A2 
237,019 
   
San Diego, Series 2011, 5.250%, 8/15/41 
      
2,550 
  
California Health Facilities Financing Authority, Revenue Bonds, Sutter Health, Series 2007A, 
11/16 at 100.00 
AA– 
2,586,032 
   
5.250%, 11/15/46 (UB) 
      
1,500 
  
California Statewide Community Development Authority, Hospital Revenue Bonds, Monterey 
6/13 at 100.00 
AA– 
1,575,555 
   
Peninsula Hospital, Series 2003B, 5.250%, 6/01/18 – AGM Insured 
      
1,500 
  
California Statewide Community Development Authority, Insured Mortgage Hospital Revenue Bonds, 
5/12 at 100.00 
A– 
1,501,245 
   
Mission Community Hospital, Series 2001, 5.375%, 11/01/26 
      
545 
  
California Statewide Community Development Authority, Revenue Bonds, Kaiser Permanente System, 
8/16 at 100.00 
A+ 
561,633 
   
Series 2001C, 5.250%, 8/01/31 
      
1,880 
  
California Statewide Community Development Authority, Revenue Bonds, Los Angeles Orthopaedic 
6/12 at 100.00 
BBB+ 
1,883,271 
   
Hospital Foundation, Series 2000, 5.500%, 6/01/17 – AMBAC Insured 
      
540 
  
Loma Linda, California, Hospital Revenue Bonds, Loma Linda University Medical Center, Series 
12/17 at 100.00 
BBB 
602,591 
   
2008A, 8.250%, 12/01/38 
      
1,100 
  
Palomar Pomerado Health Care District, California, Certificates of Participation, Series 2010, 
11/20 at 100.00 
Baa3 
1,080,409 
   
6.000%, 11/01/41 
      
670 
  
San Buenaventura, California, Revenue Bonds, Community Memorial Health System, Series 2011, 
12/21 at 100.00 
BB 
722,950 
   
7.500%, 12/01/41 
      
800 
  
Upland, California, Certificates of Participation, San Antonio Community Hospital, Series 
1/21 at 100.00 
A 
867,136 
   
2011, 6.500%, 1/01/41 
      
11,320 
  
Total Health Care 
    
11,617,841 
   
Housing/Multifamily – 1.3% 
      
375 
  
California Municipal Finance Authority, Mobile Home Park Revenue Bonds, Caritas Projects 
8/20 at 100.00 
BBB– 
379,121 
   
Series 2010A, 6.400%, 8/15/45 
      
750 
  
California Statewide Communities Development Authority, Student Housing Revenue Bonds, 
8/12 at 100.00 
Baa1 
771,885 
   
EAH-East Campus Apartments, LLC-UC Irvine Project, Series 2002A, 5.500%, 8/01/22 – ACA Insured 
      
1,125 
  
Total Housing/Multifamily 
    
1,151,006 
   
Housing/Single Family – 0.1% 
      
75 
  
California Housing Finance Agency, Home Mortgage Revenue Bonds, Series 2006H, 5.750%, 
2/16 at 100.00 
BBB 
75,044 
   
8/01/30 – FGIC Insured (Alternative Minimum Tax) 
      
   
Industrials – 1.2% 
      
1,015 
  
California Pollution Control Financing Authority, Solid Waste Disposal Revenue Bonds, Republic 
No Opt. Call 
BBB 
1,124,529 
   
Services Inc., Series 2002C, 5.250%, 6/01/23 (Mandatory put 12/01/17) (Alternative 
      
   
Minimum Tax) 
      
   
Long-Term Care – 2.7% 
      
1,500 
  
ABAG Finance Authority for Non-Profit Corporations, California, Insured Senior Living Revenue 
11/12 at 100.00 
A– 
1,518,000 
   
Bonds, Odd Fellows Home of California, Series 2003A, 5.200%, 11/15/22 
      
1,000 
  
California Statewide Communities Development Authority, Revenue Bonds, Inland Regional Center 
12/17 at 100.00 
Baa1 
977,290 
   
Project, Series 2007, 5.250%, 12/01/27 
      
2,500 
  
Total Long-Term Care 
    
2,495,290 
   
Tax Obligation/General – 36.4% 
      
750 
  
California State, General Obligation Bonds, Series 2004, 5.000%, 2/01/23 
2/14 at 100.00 
A1 
799,470 
1,650 
  
California State, General Obligation Bonds, Various Purpose Series 2009, 5.500%, 11/01/39 
11/19 at 100.00 
A1 
1,777,595 
2,500 
  
California State, General Obligation Bonds, Various Purpose Series 2011, 5.000%, 10/01/41 
10/21 at 100.00 
A1 
2,576,700 
6,225 
  
Escondido Union High School District, San Diego County, California, General Obligation 
No Opt. Call 
Aa2 
1,477,877 
   
Refunding Bonds, Series 2009B, 0.000%, 8/01/36 – AGM Insured 
      
1,000 
  
Fremont Unified School District, Alameda County, California, General Obligation Bonds, Series 
8/12 at 101.00 
Aa2 
1,031,280 
   
2002A, 5.000%, 8/01/21 – FGIC Insured 
      
   
Golden West Schools Financing Authority, California, General Obligation Revenue Refunding 
      
   
Bonds, School District Program, Series 1999A: 
      
4,650 
  
0.000%, 8/01/16 – NPFG Insured 
No Opt. Call 
BBB 
3,887,633 
1,750 
  
0.000%, 2/01/17 – NPFG Insured 
No Opt. Call 
BBB 
1,412,583 
2,375 
  
0.000%, 8/01/17 – NPFG Insured 
No Opt. Call 
BBB 
1,870,479 
2,345 
  
0.000%, 2/01/18 – NPFG Insured 
No Opt. Call 
BBB 
1,795,121 
   
Mountain View-Los Altos Union High School District, Santa Clara County, California, General 
      
   
Obligation Capital Appreciation Bonds, Series 1997C: 
      
1,015 
  
0.000%, 5/01/17 – NPFG Insured 
No Opt. Call 
Aa1 
862,476 
1,080 
  
0.000%, 5/01/18 – NPFG Insured 
No Opt. Call 
Aa1 
892,188 
5,500 
  
Poway Unified School District, San Diego County, California, School Facilities Improvement 
No Opt. Call 
Aa2 
689,480 
   
District 2007-1 General Obligation Bonds, Series 2011B, 0.000%, 8/01/46 
      
100 
  
Roseville Joint Union High School District, Placer County, California, General Obligation 
8/15 at 100.00 
AA– 
106,033 
   
Bonds, Series 2006B, 5.000%, 8/01/27 – FGIC Insured 
      
3,220 
  
Sacramento City Unified School District, Sacramento County, California, General Obligation 
7/15 at 100.00 
Aa3 
3,460,373 
   
Bonds, Series 2005, 5.000%, 7/01/27 – NPFG Insured 
      
8,075 
  
San Bernardino Community College District, California, General Obligation Bonds, Election of 
No Opt. Call 
Aa2 
1,095,535 
   
2008 Series 2009B, 0.000%, 8/01/44 
      
1,500 
  
San Diego Unified School District, San Diego County, California, General Obligation Bonds, 
7/13 at 101.00 
Aa2 
1,615,860 
   
Series 2003E, 5.250%, 7/01/24 – AGM Insured 
      
26,655 
  
Southwestern Community College District, San Diego County, California, General Obligation 
No Opt. Call 
Aa2 
3,202,065 
   
Bonds, Election of 2008, Series 2011C, 0.000%, 8/01/46 
      
2,565 
  
Sunnyvale School District, Santa Clara County, California, General Obligation Bonds, Series 
9/15 at 100.00 
AA 
2,783,256 
   
2005A, 5.000%, 9/01/26 – AGM Insured 
      
4,250 
  
West Hills Community College District, California, General Obligation Bonds, School Facilities 
8/31 at 100.00 
AA– 
1,905,700 
   
Improvement District 3, 2008 Election Series 2011, 0.000%, 8/01/38 – AGM Insured 
      
77,205 
  
Total Tax Obligation/General 
    
33,241,704 
   
Tax Obligation/Limited – 20.7% 
      
1,000 
  
Bell Community Redevelopment Agency, California, Tax Allocation Bonds, Bell Project Area, 
10/13 at 100.00 
N/R 
823,820 
   
Series 2003, 5.625%, 10/01/33 – RAAI Insured 
      
3,070 
  
California State Public Works Board, Lease Revenue Bonds, Department of Corrections, 
No Opt. Call 
A2 
3,424,370 
   
Calipatria State Prison, Series 1991A, 6.500%, 9/01/17 – NPFG Insured 
      
1,000 
  
California State Public Works Board, Lease Revenue Bonds, Department of Mental Health, 
6/14 at 100.00 
A2 
1,054,350 
   
Coalinga State Hospital, Series 2004A, 5.500%, 6/01/23 
      
1,500 
  
California State Public Works Board, Lease Revenue Bonds, Various Capital Projects, Series 
11/19 at 100.00 
A2 
1,662,990 
   
2009I-1, 6.375%, 11/01/34 
      
120 
  
Capistrano Unified School District, Orange County, California, Special Tax Bonds, Community 
9/15 at 100.00 
BBB 
121,112 
   
Facilities District, Series 2005, 5.000%, 9/01/24 – FGIC Insured 
      
360 
  
Chino Redevelopment Agency, California, Merged Chino Redevelopment Project Area Tax Allocation 
9/16 at 101.00 
A– 
327,236 
   
Bonds, Series 2006, 5.000%, 9/01/38 – AMBAC Insured 
      
135 
  
Community Development Commission, California, National City National City Redevelopment Project 
8/21 at 100.00 
A– 
153,374 
   
2011 Tax Allocation Bonds, 6.500%, 8/01/24 
      
1,000 
  
Fontana Public Financing Authority, California, Tax Allocation Revenue Bonds, North Fontana 
10/15 at 100.00 
A 
1,001,450 
   
Redevelopment Project, Series 2005A, 5.000%, 10/01/32 – AMBAC Insured 
      
270 
  
Fontana California Redevelopment Agancy, Jurupa Hills Redevelopment Project, Tax Allocation 
4/12 at 100.00 
A– 
270,267 
   
Refunding Bonds, 1997 Series A, 5.500%, 10/01/27 
      
250 
  
Inglewood Redevelopment Agency, California, Tax Allocation Bonds, Merged Redevelopment 
5/17 at 100.00 
BBB+ 
241,175 
   
Project, Subordinate Lien Series 2007A-1, 5.000%, 5/01/23 – AMBAC Insured 
      
   
Irvine, California, Unified School District, Community Facilities District Special Tax Bonds, 
      
   
Series 2006A: 
      
55 
  
5.000%, 9/01/26 
9/16 at 100.00 
N/R 
54,770 
130 
  
5.125%, 9/01/36 
9/16 at 100.00 
N/R 
122,282 
215 
  
Los Angeles Community Redevelopment Agency, California, Lease Revenue Bonds, Manchester 
9/15 at 100.00 
A1 
205,557 
   
Social Services Project, Series 2005, 5.000%, 9/01/37 – AMBAC Insured 
      
50 
  
Novato Redevelopment Agency, California, Tax Allocation Bonds, Hamilton Field Redevelopment 
9/21 at 100.00 
A– 
54,831 
   
Project, Series 2011, 6.750%, 9/01/40 
      
1,300 
  
Orange County, California, Special Tax Bonds, Community Facilities District 03-1 of Ladera 
8/12 at 101.00 
N/R 
1,304,303 
   
Ranch, Series 2004A, 5.625%, 8/15/34 
      
   
Perris Union High School District Financing Authority, Riverside County, California, Revenue 
      
   
Bonds, Series 2011: 
      
50 
  
6.000%, 9/01/33 
No Opt. Call 
N/R 
50,396 
100 
  
6.125%, 9/01/41 
No Opt. Call 
N/R 
100,824 
415 
  
Pittsburg Redevelopment Agency, California, Tax Allocation Bonds, Los Medanos Community 
9/18 at 100.00 
BBB 
420,092 
   
Development Project, Refunding Series 2008A, 6.500%, 9/01/28 
      
160 
  
Rancho Santa Fe CSD Financing Authority, California, Revenue Bonds, Superior Lien Series 
9/21 at 100.00 
BBB+ 
166,115 
   
2011A, 5.750%, 9/01/30 
      
105 
  
Rialto Redevelopment Agency, California, Tax Allocation Bonds, Merged Project Area, Series 
9/15 at 100.00 
A– 
97,630 
   
2005A, 5.000%, 9/01/35 – SYNCORA GTY Insured 
      
30 
  
Riverside County, California, Redevelopment Agency Jurupa Valley Project Area 2011 Tax Allocation 
10/21 at 100.00 
A– 
31,912 
   
Bonds Series B, 6.500%, 10/01/25 
      
130 
  
Roseville, California, Certificates of Participation, Public Facilities, Series 2003A, 5.000%, 
8/13 at 100.00 
AA– 
131,764 
   
8/01/25 – AMBAC Insured 
      
605 
  
Sacramento City Financing Authority, California, Lease Revenue Refunding Bonds, Series 1993A, 
No Opt. Call 
A1 
668,059 
   
5.400%, 11/01/20 – NPFG Insured 
      
25 
  
San Francisco Redevelopment Finance Authority, California, Tax Allocation Revenue Bonds, 
2/21 at 100.00 
A– 
27,376 
   
Mission Bay North Redevelopment Project, Series 2011C, 6.750%, 8/01/41 
      
   
San Francisco Redevelopment Financing Authority, California, Tax Allocation Revenue Bonds, 
      
   
Mission Bay South Redevelopment Project, Series 2011D: 
      
25 
  
7.000%, 8/01/33 
2/21 at 100.00 
BBB 
27,558 
30 
  
7.000%, 8/01/41 
2/21 at 100.00 
BBB 
32,690 
615 
  
San Jose Redevelopment Agency, California, Tax Allocation Bonds, Merged Area Redevelopment 
8/17 at 100.00 
Baa1 
586,378 
   
Project, Series 2006C, 5.000%, 8/01/25 – NPFG Insured 
      
3,000 
  
San Mateo County Transit District, California, Sales Tax Revenue Bonds, Series 2005A, 5.000%, 
6/15 at 100.00 
AA 
3,357,090 
   
6/01/21 – NPFG Insured 
      
1,000 
  
Santa Clara County Board of Education, California, Certificates of Participation, Series 2002, 
4/12 at 101.00 
BBB 
985,640 
   
5.000%, 4/01/25 – NPFG Insured 
      
40 
  
Signal Hill Redevelopment Agency, California, Project 1 Tax Allocation Bonds, Series 2011, 
4/21 at 100.00 
N/R 
41,510 
   
7.000%, 10/01/26 
      
1,000 
  
Travis Unified School District, Solano County, California, Certificates of Participation, 
9/16 at 100.00 
N/R 
938,530 
   
Series 2006, 5.000%, 9/01/26 – FGIC Insured 
      
360 
  
Turlock Public Financing Authority, California, Tax Allocation Revenue Bonds, Series 2011, 
3/21 at 100.00 
BBB+ 
387,180 
   
7.500%, 9/01/39 
      
70 
  
Yorba Linda Redevelopment Agency, Orange County, California, Tax Allocation Revenue Bonds, 
9/21 at 100.00 
A– 
75,216 
   
Yorba Linda Redevelopment Project, Subordinate Lien Series 2011A, 6.500%, 9/01/32 
      
18,215 
  
Total Tax Obligation/Limited 
    
18,947,847 
   
Transportation – 1.4% 
      
1,150 
  
Foothill/Eastern Transportation Corridor Agency, California, Toll Road Revenue Bonds, Series 
7/12 at 100.00 
BBB– 
962,343 
   
1995A, 5.000%, 1/01/35 
      
335 
  
San Francisco Airports Commission, California, Revenue Bonds, San Francisco International 
5/12 at 100.00 
A+ 
335,023 
   
Airport, Second Series 1999, Issue 23A, 5.000%, 5/01/30 – FGIC Insured (Alternative 
      
   
Minimum Tax) 
      
1,485 
  
Total Transportation 
    
1,297,366 
   
U.S. Guaranteed – 4.7% (4) 
      
800 
  
California State, General Obligation Bonds, Series 2004, 5.125%, 2/01/27 (Pre-refunded 2/01/14) 
2/14 at 100.00 
AA+ (4) 
877,656 
2,000 
  
North Orange County Community College District, California, General Obligation Bonds, Series 
8/12 at 101.00 
AA (4) 
2,075,920 
   
2002A, 5.000%, 8/01/22 (Pre-refunded 8/01/12) – NPFG Insured 
      
1,000 
  
Port of Oakland, California, Revenue Bonds, Series 2002M, 5.250%, 11/01/20 (Pre-refunded 
11/12 at 100.00 
A (4) 
1,041,970 
   
11/01/12) – FGIC Insured 
      
225 
  
San Mateo Union High School District, San Mateo County, California, Certificates of 
12/17 at 100.00 
AA– (4) 
275,051 
   
Participation, Phase 1, Series 2007A, 5.000%, 12/15/30 (Pre-refunded 12/15/17) – 
      
   
AMBAC Insured 
      
4,025 
  
Total U.S. Guaranteed 
    
4,270,597 
   
Utilities – 6.8% 
      
1,000 
  
Imperial Irrigation District, California, Electric System Revenue Bonds, Refunding Series 
11/20 at 100.00 
AA– 
1,090,840 
   
2011A, 5.500%, 11/01/41 
      
645 
  
Long Beach Bond Finance Authority, California, Natural Gas Purchase Revenue Bonds, Series 
No Opt. Call 
A– 
622,664 
   
2007A, 5.500%, 11/15/37 
      
200 
  
Los Angeles Department of Water and Power, California, Power System Revenue Bonds, Series 
7/13 at 100.00 
AA– 
211,054 
   
2003A-2, 5.000%, 7/01/21 – NPFG Insured 
      
7,600 
  
Merced Irrigation District, California, Certificates of Participation, Water and Hydroelectric 
9/16 at 64.56 
A 
3,799,392 
   
Series 2008B, 0.000%, 9/01/23 
      
215 
  
Merced Irrigation District, California, Electric System Revenue Bonds, Series 2005, 5.125%, 
9/15 at 100.00 
N/R 
201,197 
   
9/01/31 – SYNCORA GTY Insured 
      
275 
  
Turlock Irrigation District, California, Revenue Refunding Bonds, Series 1992A, 6.250%, 
No Opt. Call 
A2 
275,030 
   
1/01/12 – NPFG Insured 
      
9,935 
  
Total Utilities 
    
6,200,177 
   
Water and Sewer – 2.5% 
      
150 
  
Healdsburg Public Financing Authority, California, Wastewater Revenue Bonds, Series 2006, 
4/16 at 100.00 
AA– 
153,885 
   
5.000%, 4/01/36 – NPFG Insured 
      
250 
  
Sacramento County Sanitation District Financing Authority, California, Revenue Bonds, Series 
6/16 at 100.00 
AA 
264,018 
   
2006, 5.000%, 12/01/31 – FGIC Insured 
      
825 
  
South Feather Water and Power Agency, California, Water Revenue Certificates of Participation, 
4/13 at 100.00 
A 
833,638 
   
Solar Photovoltaic Project, Series 2003, 5.375%, 4/01/24 
      
1,000 
  
Woodbridge Irrigation District, California, Certificates of Participation, Water Systems 
7/13 at 100.00 
A+ 
1,004,200 
   
Project, Series 2003, 5.625%, 7/01/43 
      
2,225 
  
Total Water and Sewer 
    
2,255,741 
$    139,710 
  
Total Investments (cost $87,786,370) – 100.9% 
    
92,216,751 
   
Floating Rate Obligations – (1.7)% 
    
(1,540,000) 
   
Other Assets Less Liabilities – 0.8% 
    
678,495 
   
Net Assets – 100% 
    
$    91,355,246 
 
 
 
 
 
 
 
Fair Value Measurements
 
Fair value is defined as the price that the Fund would receive upon selling an investment or transferring a liability in an orderly transaction to an independent buyer in the principal or most advantageous market for the investment. A three-tier hierarchy is used to maximize the use of observable market data and minimize the use of unobservable inputs and to establish classification of fair value measurements for disclosure purposes. Observable inputs reflect the assumptions market participants would use in pricing the asset or liability. Observable inputs are based on market data obtained from sources independent of the reporting entity. Unobservable inputs reflect the reporting entity’s own assumptions about the assumptions market participants would use in pricing the asset or liability. Unobservable inputs are based on the best information available in the circumstances. The three-tier hierarchy of inputs is 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 methodologies 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 December 31, 2011:
 
                         
   
Level 1
    
Level 2
    
Level 3
    
Total
  
Investments: 
                        
Municipal Bonds 
   $ —     $ 92,216,751     $ —     $ 92,216,751  
 
During the period ended December 31, 2011, the Fund recognized no significant transfers to or from Level 1, Level 2 or Level 3.
 
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 securities reflected as financing transactions, 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 December 31, 2011, the cost of investments was $86,236,256.
 
Gross unrealized appreciation and gross unrealized depreciation of investments at December 31, 2011, were as follows:
 
       
Gross unrealized: 
      
Appreciation 
   $ 5,902,445  
Depreciation 
     (1,466,400 ) 
Net unrealized appreciation (depreciation) of investments 
   $ 4,436,045  
 
     
(1) 
  
All percentages shown in the Portfolio of Investments are based on net assets. 
(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 highest of Standard & Poor’s Group ("Standard & Poor's"), Moody’s Investors Service, 
   
Inc. ("Moody's") or Fitch, Inc. ("Fitch") rating. Ratings below BBB by Standard & Poor’s, Baa by Moody’s or 
   
BBB by Fitch are considered to be below investment grade. Holdings designated N/R are not rated by 
   
any of these national rating agencies. 
(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. Certain bonds backed by U.S. Government or 
   
agency securities are regarded as having an implied rating equal to the rating of such securities. 
N/R 
  
Not rated. 
(UB) 
  
Underlying bond of an inverse floating rate trust reflected as a financing transaction. 
 
 
 
 
Item 2. Controls and Procedures.

a.  
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)).
 
 
b.  
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 California Select Tax-Free Income Portfolio 
 
By (Signature and Title)     /s/ Kevin J. McCarthy                    
                                                   Kevin J. McCarthy
                                                   Vice President and Secretary
 
Date         February 29, 2012        
 
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         February 29, 2012        
 
By (Signature and Title)     /s/ Stephen D. Foy                              
                                                   Stephen D. Foy
                                                  Vice President and Controller (principal financial officer) 
 
Date         February 29, 2012