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Water-Year Summary for Site 11441760

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Available Parameters
00054 Reservoir storage(Obs.)  

Water year 2023: 2022-10-01 to 2023-09-30
 
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USGS Water-Year Summary 2023
11441760 Junction Reservoir near Pollock Pines, CA
LOCATION - Lat 38°51'07", long 120°27'22" referenced to North American Datum of 1927, in SW 1/4 SW 1/4 sec.30, T.12 N., R.14 E., El Dorado County, CA, Hydrologic Unit 18020129, in outlet structure to Jaybird Powerplant, 100 ft upstream from left abutment of Junction Diversion Dam, 0.3 mi downstream from South Fork Silver Creek, and 9.0 mi northeast of Pollock Pines.
DRAINAGE AREA - 146 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1991 to current year. Unpublished records for water years 1980-91 available in files of the U.S. Geological Survey.
GAGE - Water-stage recorder. Datum of gage is NGVD of 1929 (levels by Sacramento Municipal Utility District). Prior to Apr. 13, 1987, nonrecording gage at same site and datum.
COOPERATION - Records were collected by Sacramento Municipal Utility District, under general supervision of the U.S. Geological Survey, in connection with Federal Energy Regulatory Commission project no. 2101.
REMARKS - Reservoir is formed by concrete arch dam completed in 1962. Storage began in 1962. Contents based on capacity table dated May 2000. Capacity, 2,610 acre-ft at 4,450 ft, crest of spillway. Most of the flow is diverted at this reservoir to Jaybird Powerplant (station 11441780). Records, including extremes, represent total contents at 2400 hours. See schematic diagram of South Fork American River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum contents, 3,737 acre-ft, Jan. 2, 1997, elevation, 4,459.10 ft; minimum, 462 acre-ft, May 3-7, 2001, minimum elevation, 4,394.70 ft, May 3, 2001.