USGS Water-Year Summary for Site USGS 10260950

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Med.)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Max.,Min.,Med.)
	00400 pH(Max.,Min.,Med.)

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

10260950 West Fork Mojave River above Mojave River Forks Reservoir, near Hesperia, CA

LOCATION - Lat 34°20'20", long 117°15'25" referenced to North American Datum of 1927, in NW 1/4 NW 1/4 sec.24, T.3 N., R.4 W., San Bernardino County, CA, Hydrologic Unit 18090208, on left bank, on upstream wingwall of concrete double-box culvert on Arrowhead Lake Road, 0.1 mi northeast of junction with Highway 174, 4.5 mi downstream from Cedar Springs Dam on Silverwood Lake, and 6.5 mi southeast of Hesperia.

DRAINAGE AREA - 70.3 mi².

REVISIONS HISTORY - WDR CA-84: 1983. On Dec. 19, 2013, discharge records were revised for the period of Nov. 19-29, 2012.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1974 to current year. October 1974 to September 1991 published incorrectly as station 10261000. Records for station 10261000 are not equivalent due to difference in drainage area.

GAGE - Water-stage recorder and culvert control. Datum of gage is 3,025.23 ft above NAVD of 1988.

REMARKS - Flow regulated by Silverwood Lake (holding basin for imported water from East Branch California Aqueduct), total capacity, 74,970 acre-ft, 4.5 mi upstream, which releases all natural inflow as soon as possible after a storm. See schematic diagram of Mojave River Basin available from the California Water Science Center.

EXTREMES OUTSIDE PERIOD OF RECORD - Maximum discharge, 26,100 ft³/s, Mar. 2, 1938, gage height unknown, on basis of slope-area measurement of peak flow for station 10261000 at site 1.5 mi downstream. No flow many days.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 11,700 ft³/s, Jan. 11, 2005, estimated, gage height, 40.32 ft (maximum gage height affected by backwater from Mojave River Forks Reservoir); no flow for several months in most years.

WATER-QUALITY RECORDS

PERIOD OF RECORD -

DISCRETE WATER-QUALITY DATA:
CHEMICAL DATA: Water years April 2007 to current year.

CONTINUOUS WATER-QUALITY DATA
pH: Water years February 2007 to current year.
SPECIFIC CONDUCTANCE: Water years February 2007 to current year.
WATER TEMPERATURE: Water years February 2007 to current year.

INSTRUMENTATION - Water-quality monitor recording pH, specific conductance, and water temperature since February 2007.