USGS Water-Year Summary 2020
11109700 Lake Piru near Piru, CA
LOCATION - Lat 34°27'41", long 118°45'02" referenced to North American Datum of 1927, Ventura County, CA, Hydrologic Unit 18070102, in Temescal Grant, near center of Santa Felicia Dam on Piru Creek, 0.5 mi downstream from Santa Felicia Canyon, 4.2 mi northeast of Piru, and 20 mi downstream from Pyramid Dam.
DRAINAGE AREA - 425 mi².
PERIOD OF RECORD - May 1955 to current year. Prior to October 1985, month end elevation and contents only.
GAGE - Water-stage recorder. Datum of gage is NGVD of 1929 (levels by United Water Conservation District). Prior to Jan. 27, 1956, reference point at intake tower at same datum. Jan. 27, 1956, to Dec. 1, 1980, nonrecording gage at same site and datum.
COOPERATION - Station operated and maintained in cooperation with United Water Conservation District.
EXTREMES FOR PERIOD OF RECORD - Maximum contents observed, 109,400 acre-ft, Feb. 25, 1969, elevation, 1,061.45 ft; lake dry Oct. 25 to Nov. 20, 1961.