USGS Water-Year Summary 2024

11230215 South Fork San Joaquin River below Hooper Creek, near Florence Lake, CA

LOCATION - Lat 37°18'35", long 118°57'40" referenced to North American Datum of 1927, Fresno County, CA, Hydrologic Unit 18040006, unsurveyed, in Sierra National Forest, on right bank, 0.1 mi downstream from Hooper Creek, 3.5 mi downstream from Florence Lake Dam, and 17 mi northeast of town of Big Creek.

DRAINAGE AREA - 184 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1978 to September 1997, October 1998 to current year. October 1946 to September 1978, operated as a low-flow station only, in files of the U.S. Geological Survey.

GAGE - Water-stage recorder, Parshall flume, and concrete control. Datum of gage is 6,949.41 ft above NGVD of 1929 (levels by Southern California Edison Co.).

COOPERATION - Records were collected by Southern California Edison Co., under general supervision of the U.S. Geological Survey, in connection with Federal Energy Regulatory Commission project nos. 67 and 120.

REMARKS - Flow regulated by Florence Lake (station 11229600) 3.5 mi upstream, and Hooper Creek Diversion Dam (capacity less than 2 acre-ft) 0.7 mi upstream. Most of the water is diverted at Florence Lake to Ward Tunnel (station 11229500). See schematic diagram of upper San Joaquin River Basin available from the California Water Science Center.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 10,400 ft³/s, estimated, June 2, 2005, gage height unknown; minimum daily, 3.9 ft³/s, Oct. 24, 1979.