USGS Water-Year Summary for Site 11430000

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

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USGS Water-Year Summary 2023

11430000 South Fork Rubicon River below Gerle Creek, near Georgetown, CA

LOCATION - Lat 38°57'17", long 120°24'02" referenced to North American Datum of 1927, in SW 1/4 SW 1/4 sec.22, T.13 N., R.14 E., El Dorado County, CA, Hydrologic Unit 18020128, in Eldorado National Forest, on left bank, 600 ft downstream from Gerle Creek, 1.2 mi downstream from South Fork Rubicon River Diversion Dam, and 18 mi east of Georgetown.

DRAINAGE AREA - 47.6 mi².

REVISIONS HISTORY - WSP 1931: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - February 1910 to June 1914 (published as "Little South Fork Rubicon River below Gerle Creek, near Quintette"), August 1961 to September 2018 (discontinued).

GAGE - Water-stage recorder. Elevation of gage is 4,970 ft above NGVD of 1929, from topographic map. Feb. 1, 1910, to June 21, 1914, nonrecording gage at site about 700 ft downstream at different 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 - Beginning in 1884, flow regulated by Loon Lake (station 11429350). Original dam was dismantled during September and October 1962 to permit construction of a new earthfill dam completed Dec. 27, 1963. Loon Lake receives water from Rubicon River via Rubicon-Rockbound Tunnel (station 11427940) to Buck Island Lake and from Buck Island Lake to Loon Lake via Buck-Loon Tunnel (station 11428300). Prior to Dec. 3, 1961, water was diverted out of the basin in Georgetown Divide Ditch. Water is diverted 1.2 mi upstream at South Fork Rubicon River Diversion Dam to Robbs Peak Powerplant. Diversion of up to 1,440 ft³/s to Silver Creek Basin began in October 1962. See schematic diagram of Middle Fork American and Rubicon River Basins available from the California Water Science Center.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 12,600 ft³/s, Jan. 1, 1997, gage height, 12.65 ft, from rating curve extended above 2,500 ft³/s, on basis of slope-area measurement of peak flow; minimum, 0.8 ft³/s, Sept. 21, 1962.