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Water-Year Summary for Site 11318500

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Available Parameters
00060 Discharge(Mean)  

Water year 2023: 2022-10-01 to 2023-09-30
 
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USGS Water-Year Summary 2023
11318500 South Fork Mokelumne River near West Point, CA
LOCATION - Lat 38°22'06", long 120°32'40" referenced to North American Datum of 1927, in SE 1/4 SE 1/4 sec.16, T.6 N., R.13 E., Calaveras County, CA, Hydrologic Unit 18040012, on right bank, 200 ft downstream from Wet Gulch, 500 ft upstream from highway bridge, 2.4 mi southwest of West Point, and 2.5 mi upstream from mouth.
DRAINAGE AREA - 75.1 mi².
REVISIONS HISTORY - WSP 1315-A: 1934 (instantaneous maximum discharge). WSP 1930: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1933 to current year.
GAGE - Water-stage recorder. Elevation of gage is 1,950 ft above NGVD of 1929, from topographic map. October 1933 to Sept. 19, 1957, at site 1,100 ft downstream at different datum.
COOPERATION - Records were collected by East Bay Municipal Utility District, under general supervision of the U.S Geological Survey.
REMARKS - The Middle Fork Ditch can divert 10 ft³/s from the Middle Fork Mokelumne River which, due to leakage, delivers about 5 ft³/s to Licking Fork Mokelumne River. There are two pumps with a combined capacity of 8.9 ft³/s that can pump water to Jeff Davis Reservoir upstream from the station. There are other small diversions upstream from the station for irrigation and domestic use. See schematic diagram of Mokelumne River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 7,610 ft³/s, Jan. 2, 1997, gage height, 12.72 ft, from rating curve extended above 2,700 ft³/s, on basis of slope-area measurement of peak flow; no flow many days during August and September 1934.