Edgar Filing: NUVEEN CALIFORNIA SELECT TAX FREE INCOME PORTFOLIO

Unassociated Document

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: 6/30/12

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)
	June 30, 2012
Principal		Optional Call
Amount (000)	Description (1)	Provisions (2)	Ratings (3)	Value
	Consumer Staples – 4.3%
$ 140	California County Tobacco Securitization Agency, Tobacco Settlement Asset-Backed Bonds, Sonoma	6/15 at 100.00	BB+	$ 135,646
	County Tobacco Securitization Corporation, Series 2005, 4.250%, 6/01/21
940	California County Tobacco Securitization Agency, Tobacco Settlement Asset-Backed Revenue	12/12 at 100.00	A3	942,651
	Bonds, Fresno County Tobacco Funding Corporation, Series 2002, 5.625%, 6/01/23
	Golden State Tobacco Securitization Corporation, California, Tobacco Settlement Asset-Backed
	Bonds, Series 2007A-1:
1,065	5.750%, 6/01/47	6/17 at 100.00	BB-	856,175
1,885	5.125%, 6/01/47	6/17 at 100.00	BB–	1,367,360
1,095	Golden State Tobacco Securitization Corporation, California, Tobacco Settlement Asset-Backed	6/22 at 100.00	BB–	823,593
	Bonds, Series 2007A-2, 0.000%, 6/01/37
5,125	Total Consumer Staples			4,125,425
	Education and Civic Organizations – 3.9%
3,000	California Educational Facilities Authority, Revenue Bonds, Santa Clara University, Series 2008A,	4/18 at 100.00	Aa3	3,382,020
	5.625%, 4/01/37
45	California Educational Facilities Authority, Revenue Bonds, University of Redlands, Series 2005A,	10/15 at 100.00	A3	46,227
	5.000%, 10/01/35
	California Educational Facilities Authority, Revenue Bonds, University of the Pacific,
	Series 2006:
35	5.000%, 11/01/21	11/15 at 100.00	A2	37,477
45	5.000%, 11/01/25	11/15 at 100.00	A2	47,373
250	California Statewide Communities Development Authority, School Facility Revenue Bonds,	7/21 at 100.00	BBB	271,180
	Alliance College-Ready Public Schools, Series 2011A, 7.000%, 7/01/46
3,375	Total Education and Civic Organizations			3,784,277
	Health Care – 10.5%
235	California Health Facilities Financing Authority, Revenue Bonds, Rady Children’s Hospital –	8/21 at 100.00	A+	249,055
	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–	2,666,408
	5.250%, 11/15/46 (UB)
1,500	California Statewide Community Development Authority, Hospital Revenue Bonds, Monterey	6/13 at 100.00	AA–	1,554,015
	Peninsula Hospital, Series 2003B, 5.250%, 6/01/18 – AGM Insured
1,500	California Statewide Community Development Authority, Insured Mortgage Hospital Revenue Bonds,	11/12 at 100.00	A–	1,501,680
	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+	602,923
	Series 2001C, 5.250%, 8/01/31
540	Loma Linda, California, Hospital Revenue Bonds, Loma Linda University Medical Center, Series	12/17 at 100.00	BBB	617,603
	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	1,158,465
	6.000%, 11/01/41
670	San Buenaventura, California, Revenue Bonds, Community Memorial Health System, Series 2011,	12/21 at 100.00	BB	800,174
	7.500%, 12/01/41
800	Upland, California, Certificates of Participation, San Antonio Community Hospital, Series	1/21 at 100.00	A	920,272
	2011, 6.500%, 1/01/41
9,440	Total Health Care			10,070,595
	Housing/Multifamily – 0.9%
375	California Municipal Finance Authority, Mobile Home Park Revenue Bonds, Caritas Projects	8/20 at 100.00	BBB	409,110
	Series 2010A, 6.400%, 8/15/45
395	California Municipal Finance Authority, Mobile Home Park Revenue Bonds, Caritas Projects	8/22 at 100.00	BBB	409,248
	Series 2012A, 5.500%, 8/15/47
770	Total Housing/Multifamily			818,358
	Housing/Single Family – 0.1%
65	California Housing Finance Agency, Home Mortgage Revenue Bonds, Series 2006H, 5.750%,	2/16 at 100.00	BBB	67,703
	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	1,149,863
	Services Inc., Series 2002C, 5.250%, 6/01/23 (Mandatory put 12/01/17) (Alternative Minimum Tax)
	Long-Term Care – 1.6%
1,500	ABAG Finance Authority for Non-Profit Corporations, California, Insured Senior Living Revenue	11/12 at 100.00	A–	1,508,850
	Bonds, Odd Fellows Home of California, Series 2003A, 5.200%, 11/15/22
	Tax Obligation/General – 39.2%
750	California State, General Obligation Bonds, Series 2004, 5.000%, 2/01/23	2/14 at 100.00	A1	793,140
1,650	California State, General Obligation Bonds, Various Purpose Series 2009, 5.500%, 11/01/39	11/19 at 100.00	A1	1,849,964
2,500	California State, General Obligation Bonds, Various Purpose Series 2011, 5.000%, 10/01/41	10/21 at 100.00	A1	2,658,825
2,000	California State, Various Purpose General Obligation Refunding Bonds, Series 2012,	4/22 at 100.00	A1	2,226,660
	5.250%, 4/01/35
6,225	Escondido Union High School District, San Diego County, California, General Obligation	No Opt. Call	Aa2	1,772,631
	Refunding Bonds, Election 2008 Series 2009, 0.000%, 8/01/36 – AGM 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	4,070,796
1,750	0.000%, 2/01/17 – NPFG Insured	No Opt. Call	BBB	1,481,813
2,375	0.000%, 8/01/17 – NPFG Insured	No Opt. Call	BBB	1,967,640
2,345	0.000%, 2/01/18 – NPFG Insured	No Opt. Call	BBB	1,885,872
	Mountain View-Los Altos Union High School District, Santa Clara County, California, General
	Obligation Capital Appreciation Bonds, Series 1995C:
1,015	0.000%, 5/01/17 – NPFG Insured	No Opt. Call	Aa1	901,269
1,080	0.000%, 5/01/18 – NPFG Insured	No Opt. Call	Aa1	933,034
5,500	Poway Unified School District, San Diego County, California, School Facilities Improvement	No Opt. Call	Aa2	909,315
	District 2007-1 General Obligation Bonds, Election 2008 Series 2011A, 0.000%, 8/01/46
100	Roseville Joint Union High School District, Placer County, California, General Obligation	8/15 at 100.00	AA+	109,271
	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	AA–	3,512,730
	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	1,495,409
	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	1,585,590
	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	4,354,624
	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	2,830,708
	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–	2,312,850
	Improvement District 3, 2008 Election Series 2011, 0.000%, 8/01/38 – AGM Insured
78,205	Total Tax Obligation/General			37,652,141
	Tax Obligation/Limited – 21.9%
1,000	Bell Community Redevelopment Agency, California, Tax Allocation Bonds, Bell Project Area,	10/13 at 100.00	N/R	912,150
	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	3,407,332
	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	1,069,190
	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	1,790,820
	2009-I, 6.375%, 11/01/34
120	Capistrano Unified School District, Orange County, California, Special Tax Bonds, Community	9/15 at 100.00	BBB	122,960
	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–	355,061
	Bonds, Series 2006, 5.000%, 9/01/38 – AMBAC Insured
1,000	Fontana Public Financing Authority, California, Tax Allocation Revenue Bonds, North Fontana	10/15 at 100.00	A	1,016,890
	Redevelopment Project, Series 2005A, 5.000%, 10/01/32 – AMBAC Insured
270	Fontana, California, Redevelopment Agency, Jurupa Hills Redevelopment Project, Tax Allocation	10/12 at 100.00	A–	270,653
	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+	255,913
	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	56,538
130	5.125%, 9/01/36	9/16 at 100.00	N/R	131,572
215	Los Angeles Community Redevelopment Agency, California, Lease Revenue Bonds, Manchester Social	9/15 at 100.00	A1	218,290
	Services Project, Series 2005, 5.000%, 9/01/37 – AMBAC Insured
135	National City Community Development Commission, California, Tax Allocation Bonds, National	8/21 at 100.00	A–	158,163
	City Redevelopment Project, Series 2011, 6.500%, 8/01/24
50	Novato Redevelopment Agency, California, Tax Allocation Bonds, Hamilton Field Redevelopment	9/21 at 100.00	A–	56,883
	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	1,313,481
	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	9/12 at 103.00	N/R	51,562
100	6.125%, 9/01/41	9/12 at 103.00	N/R	103,104
415	Pittsburg Redevelopment Agency, California, Tax Allocation Bonds, Los Medanos Community	9/18 at 100.00	BBB	447,673
	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+	173,382
	2011A, 5.750%, 9/01/30
105	Rialto Redevelopment Agency, California, Tax Allocation Bonds, Merged Project Area, Series	9/15 at 100.00	A–	105,039
	2005A, 5.000%, 9/01/35 – SYNCORA GTY Insured
30	Riverside County Redevelopment Agency, California, Tax Allocation Bonds, Jurupa Valley Project	10/21 at 100.00	A–	33,182
	Area, Series 2011B, 6.500%, 10/01/25
130	Roseville, California, Certificates of Participation, Public Facilities, Series 2003A, 5.000%,	8/13 at 100.00	AA–	132,057
	8/01/25 – AMBAC Insured
605	Sacramento City Financing Authority, California, Lease Revenue Refunding Bonds, Series 1993A,	No Opt. Call	A1	694,032
	5.400%, 11/01/20 – NPFG Insured
1,365	San Diego County Regional Transportation Commission, California, Sales Tax Revenue Bonds,	4/22 at 100.00	AAA	1,541,945
	Series 2012A, 5.000%, 4/01/42
25	San Francisco Redevelopment Finance Authority, California, Tax Allocation Revenue Bonds,	2/21 at 100.00	A–	28,642
	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	28,530
30	7.000%, 8/01/41	2/21 at 100.00	BBB	33,834
615	San Jose Redevelopment Agency, California, Tax Allocation Bonds, Merged Area Redevelopment	8/17 at 100.00	BBB	603,395
	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	3,355,590
	6/01/21 – NPFG Insured
1,000	Santa Clara County Board of Education, California, Certificates of Participation, Series 2002,	4/13 at 100.00	BBB	1,003,160
	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	43,627
	7.000%, 10/01/26
1,000	Travis Unified School District, Solano County, California, Certificates of Participation,	9/16 at 100.00	N/R	1,007,410
	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+	400,766
	7.500%, 9/01/39
70	Yorba Linda Redevelopment Agency, Orange County, California, Tax Allocation Revenue Bonds,	9/21 at 100.00	A–	78,107
	Yorba Linda Redevelopment Project, Subordinate Lien Series 2011A, 6.500%, 9/01/32
19,580	Total Tax Obligation/Limited			21,000,933
	Transportation – 1.2%
1,150	Foothill/Eastern Transportation Corridor Agency, California, Toll Road Revenue Bonds, Series	1/13 at 100.00	BBB–	1,150,288
	1995A, 5.000%, 1/01/35
	U.S. Guaranteed – 5.4% (4)
1,000	California Educational Facilities Authority, Revenue Bonds, University of San Diego, Series	10/12 at 100.00	A2 (4)	1,013,520
	2002A, 5.500%, 10/01/32 (Pre-refunded 10/01/12)
800	California State, General Obligation Bonds, Series 2004, 5.125%, 2/01/27 (Pre-refunded 2/01/14)	2/14 at 100.00	AAA	861,160
2,000	North Orange County Community College District, California, General Obligation Bonds, Series	8/12 at 101.00	AA (4)	2,028,520
	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)	1,017,220
	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)	275,533
	Participation, Phase 1, Series 2007A, 5.000%, 12/15/30 (Pre-refunded 12/15/17) – AMBAC Insured
5,025	Total U.S. Guaranteed			5,195,953
	Utilities – 6.5%
1,000	Imperial Irrigation District, California, Electric System Revenue Bonds, Refunding Series 2011A,	11/20 at 100.00	A1	1,125,420
	5.500%, 11/01/41
645	Long Beach Bond Finance Authority, California, Natural Gas Purchase Revenue Bonds, Series 2007A,	No Opt. Call	A	700,902
	5.500%, 11/15/37
200	Los Angeles Department of Water and Power, California, Power System Revenue Bonds,	7/13 at 100.00	AA–	208,964
	Series 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	4,002,312
	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	217,965
	9/01/31 – SYNCORA GTY Insured
9,660	Total Utilities			6,255,563
	Water and Sewer – 2.4%
150	Healdsburg Public Financing Authority, California, Wastewater Revenue Bonds, Series 2006,	4/16 at 100.00	AA–	156,050
	5.000%, 4/01/36 – NPFG Insured
250	Sacramento County Sanitation District Financing Authority, California, Revenue Bonds, Series	6/16 at 100.00	AA	277,803
	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	833,671
	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+	1,008,490
	Project, Series 2003, 5.625%, 7/01/43
2,225	Total Water and Sewer			2,276,014
$ 137,135	Total Investments (cost $85,703,379) – 99.1%			95,055,963
	Floating Rate Obligations – (1.6)%			(1,540,000)
	Other Assets Less Liabilities – 2.5%			2,424,689
	Net Assets – 100%			$ 95,940,652

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 following is a summary of the three-tiered hierarchy of valuation input levels.

Level 1 – Inputs are unadjusted and prices are determined using quoted prices in active markets for identical securities.

Level 2 – Prices are determined using other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.).

Level 3 – Prices are determined using 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 risks associated with investing in those securities. The following is a summary of the Fund’s fair value measurements as of the end of the reporting period:


	Level 1	Level 2	Level 3	Total
Long-Term Investments*:
Municipal Bonds	$ —	$95,055,963	$ —	$95,055,963

* Refer to the Fund's Portfolio of Investments for industry classifications.

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 June 30, 2012, the cost of investments was $84,148,284.

Gross unrealized appreciation and gross unrealized depreciation of investments at June 30, 2012, were as follows:


Gross unrealized:
Appreciation	$9,713,389
Depreciation	(350,383)
Net unrealized appreciation (depreciation) of investments	$9,363,006


(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.

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)).

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: August 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: August 29, 2012

By (Signature and Title) /s/ Stephen D. Foy

Stephen D. Foy

Vice President and Controller (principal financial officer)

Date: August 29, 2012