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USGS Water-Year Summary 2025
10287289 Rush Creek at Flume below Agnew Lake, near June Lake, CA
LOCATION - Lat 37°45'33", long 119°07'47" referenced to North American Datum of 1927, in NE 1/4 SW 1/4 sec.20, T.2 S., R.26 E., Mono County, CA, Hydrologic Unit 18090101, in Inyo National Forest, on left bank, 600 ft downstream from Agnew Lake Dam, and 3.4 mi southwest of town of June Lake.
DRAINAGE AREA - 23.3 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1990 to current year. Prior to October 2006, published as Rush Creek Flume below Agnew Lake near June Lake. If records for Rush Creek Powerplant Tailrace (station 10287300) are combined with this record, a record equivalent to that published October 1951 to September 1990 as "Rush Creek below Agnew Lake (Actual Flow)" (station 10287290) can be obtained. Daily discharges for October 1988 to September 1990 were combined with 10287300 and published in 10287290, but are also available separately in files of U.S. Geological Survey. Monthly and yearly mean discharges prior to October 1969, published in WSP 2127. "Actual flow" is the total flow of Rush Creek below Agnew Lake and Rush Creek Powerplant tailrace. "Natural flow" (station 10287291) is the sum of "actual flow", change in contents, and evaporation for Waugh, Gem, and Agnew Lakes.
GAGE - Water-stage recorder and Parshall flume. Elevation of gage is 8,440 ft above NGVD of 1929, from topographic map.
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. 1389.
REMARKS - Flow regulated for power development by Waugh, Gem, and Agnew Lakes (stations 10287260, 10287280, and 10287285, respectively). Most of the water is diverted at either Gem or Agnew Lakes to Rush Creek Powerplant Tailrace via Rush Creek Powerplant. Record includes spill from Agnew Lake. In 2017 an 18" bypass pipe was installed to manage high runoff conditions by diverting water from the main penstock, back to Rush Creek just below the flume. Bypass flow is measured using an AVM and added to the flume discharge to a calculate peak discharge. There is no gage height to assign to these peaks.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 466 ft³/s, June 18, 2017, gage height, 4.83 ft, maximum gage height, 4.90 ft, July 30, 1995, due to potential control scouring over time; no flow for many days in some years.
