USGS Water-Year Summary 2019
10287280 Gem Lake near June Lake, CA
LOCATION - Lat 37°45'07", long 119°08'25" referenced to North American Datum of 1927, Mono County, CA, Hydrologic Unit 18090101, unsurveyed, in Inyo National Forest, in valve house, 100 ft downstream from left abutment of dam, on Rush Creek, and 4.0 mi southwest of town of June Lake.
DRAINAGE AREA - 22 mi².
PERIOD OF RECORD - October 1990 to current year. Unpublished records prior to October 1990 available in files of Southern California Edison Co.
GAGE - Water-stage recorder. Datum of gage is NGVD of 1929 (levels by Southern California Edison Co.).
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.
EXTREMES FOR PERIOD OF RECORD - Maximum contents, 17,763 acre-ft, June 19, 2000, elevation, 9,053.51 ft; minimum, 71 acre-ft, Apr. 16, 2017, elevation, 8,967.83 ft.