USGS Water-Year Summary for Site 11395400

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	00054 Reservoir storage(Obs.)

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

11395400 Sly Creek Reservoir near Strawberry Valley, CA

LOCATION - Lat 39°34'54", long 121°06'51" referenced to North American Datum of 1983, in NW 1/4 NW 1/4 sec.20, T.20 N., R.8 E., Butte County, CA, Hydrologic Unit 18020123, in Plumas National Forest, on left abutment of Sly Creek Dam on Lost Creek, and 1.4 mi northwest of Strawberry Valley.

DRAINAGE AREA - 24 mi².

REVISIONS HISTORY - See time-series revision report

SURFACE-WATER RECORDS

PERIOD OF RECORD - November 1961 to current year (fragmentary prior to Mar. 14, 1962).

GAGE - Water-stage recorder. Datum of gage is NGVD of 1929 (levels by Oroville-Wyandotte Irrigation District). Prior to Sept. 30, 1966, water-stage recorder in valve chamber inside dam at same datum. Oct. 1, 1966, to December 1974, nonrecording gage read once daily.

COOPERATION - Records provided by South Feather Water and Power Agency, under general supervision of the U.S. Geological Survey, in connection with Federal Energy Regulatory Commission project no. 2088.

REMARKS - Reservoir is formed by earth-fill dam. Storage began in November 1961. Total capacity, 64,300 acre-ft, between elevations 3,285 ft, invert of outlet, and 3,531 ft, top of spillway gate, all of which is available for release. Water is diverted into reservoir from South Fork Feather River through South Fork Diversion Tunnel and from North Yuba River Basin through Slate Creek Tunnel (station 11413250). Records, excluding extremes, represent total contents at 2400 hours. See schematic diagram of South Fork Feather River Basin available from the California Water Science Center. Contents based on capacity table furnished by South Feather Water and Power Agency, dated September 2004.

EXTREMES FOR PERIOD OF RECORD - Maximum contents, 65,600 acre-ft, June 22, 1978, elevation, 3,530.9 ft; minimum observed under normal operating conditions since reservoir first filled, 860 acre-ft, Feb. 11, 1976, elevation, 3,320.0 ft. Reservoir completely drained for powerplant construction, Sept. 12 to Oct. 17, 1981.