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Water-Year Summary for Site 11421800

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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
11421800 Rollins Reservoir near Colfax, CA
LOCATION - Lat 39°08'08", long 120°56'57" referenced to North American Datum of 1927, in NE 1/4 SE 1/4 sec.22, T.15 N., R.9 E., Placer County, CA, Hydrologic Unit 18020126, on left bank, 300 ft upstream from Rollins Dam on Bear River, and 2.3 mi north of Colfax.
DRAINAGE AREA - 104 mi².
REVISIONS HISTORY - WDR CA-01-4: Oct. 10, 1977, contents; 1978-2000, minimum contents for period of record.
SURFACE-WATER RECORDS
PERIOD OF RECORD - December 1964 to current year.
GAGE - Water-stage recorder. Datum of gage is NGVD of 1929 (levels by Nevada Irrigation District).
COOPERATION - Records were collected by Nevada Irrigation District, under general supervision of the U.S. Geological Survey, in connection with Federal Energy Regulatory Commission project no. 2266.
REMARKS - Reservoir is formed by an earthfill dam. Storage began Dec. 15, 1964. Contents based on capacity table dated 1964. Usable capacity, 66,000 acre-ft, between elevations 1,970.0 ft, invert of outlet tunnel, and 2,171.0 ft, spillway crest. Dead storage, 270 acre-ft. Records, including extremes, represent contents at 2400 hours.  Several diversions into and out of basin upstream for power development and irrigation. Water is normally released through Rollins Powerplant. Part of the water then is diverted to Bear River Canal (station 11422000) for power development. Water is later used for irrigation. See schematic diagram of Bear River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum contents, 71,700 acre-ft, Feb. 17, 1986, elevation, 2,177.7 ft; minimum since reservoir first filled, 4,550 acre-ft, Oct. 13, 1977, elevation, 2,024.7 ft.