NUVEEN CALIFORNIA SELECT TAX FREE INCOME PORTFOLIO

Regulatory Filings • Aug 28, 2006

N-Q 1 nq1.htm NXC 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 811-6623

Nuveen California Select Tax-Free Income Portfolio (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: 3/31

Date of reporting period: 6/30/06

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, 2006
Principal		Optional Call
Amount (000)	Description	Provisions (1)	Ratings (2)	Value
	Consumer Staples – 2.1%
$ 235	California County Tobacco Securitization Agency, Tobacco Settlement Asset-Backed Bonds, Sonoma	6/15 at 100.00	BBB	$ 226,307
	County Tobacco Securitization Corporation, Series 2005, 4.250%, 6/01/21
1,620	California County Tobacco Securitization Agency, Tobacco Settlement Asset-Backed Revenue	6/12 at 100.00	BBB	1,632,555
	Bonds, Fresno County Tobacco Funding Corporation, Series 2002, 5.625%, 6/01/23
1,855	Total Consumer Staples			1,858,862
	Education and Civic Organizations – 9.4%
1,000	California Educational Facilities Authority, Revenue Bonds, Stanford University, Series 1999P,	12/09 at 101.00	AAA	1,026,410
	5.000%, 12/01/23
45	California Educational Facilities Authority, Revenue Bonds, University of Redlands, Series	10/15 at 100.00	A3	44,825
	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	1,049,180
	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	35,930
45	5.000%, 11/01/25	11/15 at 100.00	A2	45,753
3,000	California Infrastructure Economic Development Bank, Revenue Bonds, J. David Gladstone	10/11 at 101.00	A–	3,140,070
	Institutes, Series 2001, 5.500%, 10/01/19
2,000	California State Public Works Board, Lease Revenue Bonds, University of California, UCLA	10/12 at 100.00	AAA	2,050,000
	Replacement Hospital Project, Series 2002A, 5.000%, 10/01/22 – FSA Insured
1,000	Long Beach Bond Financing Authority, California, Lease Revenue Refunding Bonds, Long Beach	11/11 at 101.00	AAA	1,035,590
	Aquarium of the South Pacific, Series 2001, 5.250%, 11/01/30 – AMBAC Insured
8,125	Total Education and Civic Organizations			8,427,758
	Health Care – 10.9%
335	California Health Facilities Financing Authority, Revenue Bonds, Cedars-Sinai Medical Center,	11/15 at 100.00	A3	335,379
	Series 2005, 5.000%, 11/15/34
2,000	California Infrastructure Economic Development Bank, Revenue Bonds, Kaiser Hospital Assistance	8/11 at 102.00	A+	2,080,700
	LLC, Series 2001A, 5.550%, 8/01/31
1,500	California Statewide Community Development Authority, Hospital Revenue Bonds, Monterey	6/13 at 100.00	AAA	1,576,665
	Peninsula Hospital, Series 2003B, 5.250%, 6/01/18 – FSA Insured
1,500	California Statewide Community Development Authority, Insured Mortgage Hospital Revenue Bonds,	11/09 at 102.00	A	1,545,060
	Mission Community Hospital, Series 2001, 5.375%, 11/01/26
90	California Statewide Community Development Authority, Revenue Bonds, Daughters of Charity	7/15 at 100.00	BBB+	91,648
	Health System, Series 2005A, 5.250%, 7/01/24
1,515	California Statewide Community Development Authority, Revenue Bonds, Kaiser Permanante System,	3/16 at 100.00	A+	1,500,108
	Series 2006, 5.000%, 3/01/41
1,880	California Statewide Community Development Authority, Revenue Bonds, Los Angeles Orthopaedic	6/07 at 101.00	AAA	1,923,691
	Hospital Foundation, Series 2000, 5.500%, 6/01/17 – AMBAC Insured
790	Central California Joint Powers Health Finance Authority, Certificates of Participation,	8/06 at 100.00	Baa2	774,611
	Community Hospitals of Central California, Series 1993, 5.000%, 2/01/23
9,610	Total Health Care			9,827,862
	Housing/Multifamily – 0.9%
750	California Statewide Community Development Authority, Student Housing Revenue Bonds, EAH –	8/12 at 100.00	A	775,350
	Irvine East Campus Apartments, LLC Project, Series 2002A, 5.500%, 8/01/22 – ACA Insured
	Industrials – 2.0%
1,250	California Pollution Control Financing Authority, Solid Waste Disposal Revenue Bonds, Republic	No Opt. Call	BBB+	1,289,525
	Services Inc., Series 2002C, 5.250%, 6/01/23 (Mandatory put 12/01/17) (Alternative Minimum Tax)
500	California Pollution Control Financing Authority, Solid Waste Disposal Revenue Bonds, Waste	1/16 at 102.00	BBB	498,930
	Management Inc., Series 2002A, 5.000%, 1/01/22 (Alternative Minimum Tax)
1,750	Total Industrials			1,788,455
	Long-Term Care – 1.7%
1,500	ABAG Finance Authority for Non-Profit Corporations, California, Insured Senior Living Revenue	11/12 at 100.00	A	1,537,245
	Bonds, Odd Fellows Home of California, Series 2003A, 5.200%, 11/15/22
	Tax Obligation/General – 19.9%
500	California, General Obligation Bonds, Series 2003, 5.250%, 11/01/19 – RAAI Insured	11/13 at 100.00	AA	527,620
	California, General Obligation Bonds, Series 2004:
750	5.000%, 2/01/23	2/14 at 100.00	A	768,758
800	5.125%, 4/01/25	4/14 at 100.00	A	824,176
1,000	5.125%, 2/01/27	2/14 at 100.00	A	1,024,570
2,000	Fremont Unified School District, Alameda County, California, General Obligation Bonds, Series	8/12 at 101.00	AAA	2,063,700
	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 – MBIA Insured	No Opt. Call	AAA	2,930,570
1,750	0.000%, 2/01/17 – MBIA Insured	No Opt. Call	AAA	1,070,178
2,375	0.000%, 8/01/17 – MBIA Insured	No Opt. Call	AAA	1,419,039
2,345	0.000%, 2/01/18 – MBIA Insured	No Opt. Call	AAA	1,358,130
	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 – MBIA Insured	No Opt. Call	AAA	613,537
1,080	0.000%, 5/01/18 – MBIA Insured	No Opt. Call	AAA	618,170
	Oakland Unified School District, Alameda County, California, General Obligation Bonds,
	Series 2005:
130	5.000%, 8/01/25 – MBIA Insured	8/15 at 100.00	AAA	133,675
135	5.000%, 8/01/26 – MBIA Insured	8/15 at 100.00	AAA	138,615
1,500	San Diego Unified School District, San Diego County, California, General Obligation Bonds,	7/13 at 101.00	AAA	1,604,505
	Series 2003E, 5.250%, 7/01/24 – FSA Insured
150	San Jose-Evergreen Community College District, Santa Clara County, California, General	9/15 at 100.00	AAA	154,155
	Obligation Bonds, Series 2005A, 5.000%, 9/01/27 – MBIA Insured
2,565	Sunnyvale School District, Santa Clara County, California, General Obligation Bonds, Series	9/15 at 100.00	AAA	2,641,847
	2005A, 5.000%, 9/01/26 – FSA Insured
22,745	Total Tax Obligation/General			17,891,245
	Tax Obligation/Limited – 17.5%
1,000	Bell Community Redevelopment Agency, California, Tax Allocation Bonds, Bell Project Area,	10/13 at 100.00	AA	1,057,160
	Series 2003, 5.625%, 10/01/33 – RAAI Insured
3,500	California State Public Works Board, Lease Revenue Bonds, Department of Corrections,	No Opt. Call	AAA	4,053,245
	Calipatria State Prison, Series 1991A, 6.500%, 9/01/17 – MBIA Insured
1,000	California State Public Works Board, Lease Revenue Bonds, Department of Mental Health,	6/14 at 100.00	A–	1,067,680
	Coalinga State Hospital, Series 2004A, 5.500%, 6/01/23
660	California, Economic Recovery Revenue Bonds, Series 2004A, 5.000%, 7/01/15	7/14 at 100.00	AA–	698,564
120	Capistrano Unified School District, Orange County, California, Special Tax Bonds, Community	9/15 at 100.00	AAA	123,595
	Facilities District, Series 2005, 5.000%, 9/01/24 – FGIC Insured
1,000	Fontana Public Financing Authority, California, Tax Allocation Revenue Bonds, North Fontana	10/15 at 100.00	AAA	1,016,070
	Redevelopment Project, Series 2005A, 5.000%, 10/01/32 – AMBAC Insured
90	Hesperia Community Redevelopment Agency, California, Tax Allocation Bonds, Series 2005A,	9/15 at 100.00	AAA	93,038
	5.000%, 9/01/20 – XLCA Insured
	Irvine, California, Unified School District, Community Facilities District Special Tax Bonds,
	Series 2006A:
60	5.000%, 9/01/26	9/06 at 103.00	N/R	59,581
135	5.125%, 9/01/36	9/06 at 103.00	N/R	132,750
215	Los Angeles Community Redevelopment Agency, California, Lease Revenue Bonds, Manchester Social	9/15 at 100.00	Aaa	217,795
	Services Project, Series 2005, 5.000%, 9/01/37 – AMBAC Insured
1,300	Orange County, California, Special Tax Bonds, Community Facilities District 03-1 of Ladera	8/12 at 101.00	N/R	1,358,812
	Ranch, Series 2004A, 5.625%, 8/15/34
105	Rialto Redevelopment Agency, California, Tax Allocation Bonds, Merged Project Area, Series	9/15 at 100.00	AAA	106,420
	2005A, 5.000%, 9/01/35 – XLCA Insured
605	Sacramento City Financing Authority, California, Lease Revenue Refunding Bonds, Series 1993A,	No Opt. Call	AAA	658,415
	5.400%, 11/01/20 – MBIA Insured
3,000	San Mateo County Transit District, California, Sales Tax Revenue Bonds, Series 2005A, 5.000%,	6/15 at 100.00	AAA	3,110,220
	6/01/21 – MBIA Insured
1,000	Santa Clara County Board of Education, California, Certificates of Participation, Series 2002,	4/12 at 101.00	AAA	1,020,300
	5.000%, 4/01/25 – MBIA Insured
1,000	Travis Unified School District, Solano County, California, Certificates of Participation,	9/16 at 100.00	Aaa	1,022,750
	Series 2006, 5.000%, 9/01/26 – FGIC Insured
14,790	Total Tax Obligation/Limited			15,796,395
	Transportation – 8.2%
1,150	Foothill/Eastern Transportation Corridor Agency, California, Toll Road Revenue Bonds, Series	1/10 at 100.00	BBB–	1,103,805
	1995A, 5.000%, 1/01/35
5,000	Los Angeles Harbors Department, California, Revenue Refunding Bonds, Series 2001B, 5.500%,	8/11 at 100.00	AAA	5,270,097
	8/01/17 – AMBAC Insured (Alternative Minimum Tax)
1,000	Port of Oakland, California, Revenue Bonds, Series 2002M, 5.250%, 11/01/20 – FGIC Insured	11/12 at 100.00	AAA	1,055,040
7,150	Total Transportation			7,428,942
	U.S. Guaranteed – 16.5% (3)
400	Beverly Hills Unified School District, Los Angeles County, California, General Obligation	8/12 at 100.00	AA (3)	423,888
	Bonds, Series 2002A, 5.000%, 8/01/26 (Pre-refunded 8/01/12)
	California Department of Water Resources, Power Supply Revenue Bonds, Series 2002A:
2,000	5.750%, 5/01/17 (Pre-refunded 5/01/12)	5/12 at 101.00	Aaa	2,209,740
2,000	5.125%, 5/01/19 (Pre-refunded 5/01/12)	5/12 at 101.00	Aaa	2,145,020
750	California Educational Facilities Authority, Revenue Bonds, Pepperdine University, Series	8/09 at 100.00	A1 (3)	785,925
	2002A, 5.500%, 8/01/32 (Pre-refunded 8/01/09)
2,600	California Educational Facilities Authority, Revenue Bonds, University of the Pacific, Series	11/11 at 100.00	A2 (3)	2,765,542
	2002, 5.250%, 11/01/21 (Pre-refunded 11/01/11)
1,400	Golden State Tobacco Securitization Corporation, California, Enhanced Tobacco Settlement	6/13 at 100.00	AAA	1,518,580
	Asset-Backed Bonds, Series 2003B, 5.500%, 6/01/33 (Pre-refunded 6/01/13)
2,800	Los Angeles, California, Wastewater System Revenue Bonds, Series 1998A, 5.000%, 6/01/23	6/08 at 101.00	AAA	2,890,636
	(Pre-refunded 6/01/08) – FGIC Insured
2,000	North Orange County Community College District, California, General Obligation Bonds, Series	8/12 at 101.00	AAA	2,127,420
	2002A, 5.000%, 8/01/22 (Pre-refunded 8/01/12) – MBIA Insured
13,950	Total U.S. Guaranteed			14,866,751
	Utilities – 1.9%
200	Los Angeles Department of Water and Power, California, Power System Revenue Bonds, Series	7/13 at 100.00	AAA	206,314
	2003A-2, 5.000%, 7/01/21 – MBIA Insured
215	Merced Irrigation District, California, Electric System Revenue Bonds, Series 2005, 5.125%,	9/15 at 100.00	AAA	220,521
	9/01/31 – XLCA Insured
1,225	Turlock Irrigation District, California, Revenue Refunding Bonds, Series 1992A, 6.250%,	No Opt. Call	Aaa	1,323,515
	1/01/12 – MBIA Insured
1,640	Total Utilities			1,750,350
	Water and Sewer – 5.1%
2,160	California Statewide Community Development Authority, Water and Wastewater Revenue Bonds,	10/11 at 101.00	AAA	2,250,763
	Pooled Financing Program, Series 2001B, 5.125%, 10/01/22 – FSA Insured
150	Healdsburg Public Financing Authority, California, Wastewater Revenue Bonds, Series 2006,	4/16 at 100.00	AAA	153,183
	5.000%, 4/01/36 – MBIA Insured
325	Los Angeles Department of Water and Power, California, Waterworks Revenue Bonds, Series	7/16 at 100.00	AAA	334,672
	2006A-2, 5.000%, 7/01/27 – AMBAC Insured
825	South Feather Water and Power Agency, California, Water Revenue Certificates of Participation,	4/13 at 100.00	BBB	839,405
	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	BBB+	1,021,910
	Project, Series 2003, 5.625%, 7/01/43
4,460	Total Water and Sewer			4,599,933
$ 88,325	Total Long-Term Investments (cost $83,653,562) – 96.1%			86,549,148
	Short-Term Investments – 2.4%
2,150	Puerto Rico Government Development Bank, Adjustable Refunding Bonds, Variable Rate Demand		A-1+	2,150,000
	Obligations, Series 1985, 2.250%, 12/01/15 – MBIA Insured (4)
2,150	Total Short-Term Investments (cost $2,150,000)			2,150,000
$ 90,475	Total Investments (cost $85,803,562) – 98.5%			88,699,148
	Other Assets Less Liabilities – 1.5%			1,384,552
	Net Assets – 100%			$ 90,083,700

(1)	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.
(2)	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.
(3)	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.
(4)	Investment has a maturity of more than one year, but has variable rate and demand features
	which qualify it as a short-term investment. The rate disclosed is that in effect at the end of the
	reporting period. This rate changes periodically based on market conditions or a specified market index.
N/R	Not rated.

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 and timing differences in recognizing certain gains and losses on investment transactions.

At June 30, 2006, the cost of investments was $85,802,392.

Gross unrealized appreciation and gross unrealized depreciation of investments at June 30, 2006, were as follows:

Gross unrealized:
Appreciation	$3,147,886
Depreciation	(251,130)
Net unrealized appreciation (depreciation) of investments	$2,896,756

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 Select Tax-Free Income Portfolio

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

Date August 28, 2006

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 28, 2006

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

Date August 28, 2006

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