USGS Water-Year Summary 2021
11109600 Piru Creek above Lake Piru, CA
LOCATION - Lat 34°31'23", long 118°45'22" referenced to North American Datum of 1927, in NE 1/4 NW 1/4 sec.15, T.5 N., R.18 W., Ventura County, CA, Hydrologic Unit 18070102, on left bank near Blue Point, 1.3 mi downstream from Agua Blanca Creek, 4.3 mi upstream from Santa Felicia Dam, 8.0 mi northeast of Piru, and 15 mi downstream from Pyramid Dam.
DRAINAGE AREA - 372 mi².
- WSP 1928: Drainage area.
PERIOD OF RECORD - October 1955 to current year.
SPECIFIC CONDUCTANCE: Water years 1972-80.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 1,058.55 ft above NGVD of 1929 (levels by U.S. Forest Service). Prior to Dec. 15, 1972, at site 0.3 mi upstream at different datum.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Mar. 2, 1938, reached a discharge of 35,000 ft³/s.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 40,000 ft³/s, Jan. 10, 2005, gage height, 16.39 ft, from floodmark, from rating curve extended above 1,000 ft³/s, on basis of slope-area measurement at gage height 16.39 ft, maximum gage height, 18.6 ft, Feb. 25, 1969, site and datum then in use; no flow at times in some years.