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Water-Year Summary for Site 11231600

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Available Parameters
00060 Discharge(Mean)  

Water year 2021: 2020-10-01 to 2021-09-30

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USGS Water-Year Summary 2021
11231600 Mono Creek below Diversion Dam, near Mono Hot Springs, CA
LOCATION - Lat 37°21'36", long 118°59'51" referenced to North American Datum of 1927, Fresno County, CA, Hydrologic Unit 18040006, unsurveyed, in Sierra National Forest, on left bank, 20 ft downstream from diversion dam, 1.0 mi southwest of Lake Thomas A. Edison, and 2.5 mi northeast of Mono Hot Springs.
DRAINAGE AREA - 92.8 mi².
PERIOD OF RECORD - October 1986 to current year. October 1970 to September 1971 available in the files of the U.S. Geological Survey. Prior to October 1991, published as "at diversion dam."
GAGE - Acoustic-velocity meter on low-flow discharge, and water-stage recorder on diversion reservoir. Elevation of gage is 7,340 ft above NGVD of 1929, from topographic map. Prior to Oct. 1, 1991, at datum 10 ft higher.
COOPERATION - Records collected by Southern California Edison Co., under general supervision of the U.S. Geological Survey, in connection with Federal Energy Regulatory Commission project no. 67.
REMARKS - Flow regulated by diversion reservoir and Lake Thomas A. Edison (station 11231000). Most of the flow is diverted at the diversion dam to Mono Creek Conduit (station 11231550), then to Ward Tunnel and Huntington Lake (station 11236000) via Portal Powerplant (station 11235500) for further power development in Big Creek powerplants. Discharge, including extremes, represents the combined flow at Mono Creek and spill at diversion dam. See schematic diagram of upper San Joaquin River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum daily discharge, 1,350 ft³/s, June 21, 2006; minimum daily, 4.1 ft³/s, Dec. 12-16, 1990.