USGS Water-Year Summary 2021
11097000 Big Tujunga Creek below Hansen Dam, CA
LOCATION - Lat 34°15'13", long 118°23'17" referenced to North American Datum of 1927, Los Angeles County, CA, Hydrologic Unit 18070105, in Mission San Fernando Grant, in city of Los Angeles, on left bank of concrete outlet channel, 0.1 mi upstream from Glen Oaks Boulevard, 0.5 mi downstream from Hansen Dam, and 3 mi southeast of San Fernando.
DRAINAGE AREA - 153 mi².
- WDR CA-84-1: 1978 (instantaneous maximum discharge). WDR CA-01-1: 1992.
PERIOD OF RECORD - May 1932 to February 1938, August 1940 to current year. Monthly discharge only for some periods, published in WSP 1315-B. Prior to October 1975, published as "Tujunga Creek below Hansen Dam."
GAGE - Water-stage recorder and concrete-lined flood-control channel. Datum of gage is 945.75 ft above NAVD of 1988. See WSP 1735 for history of changes prior to Oct. 1, 1953.
COOPERATION - Records of diversion provided by Los Angeles County Department of Public Works.
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum discharge, 54,000 ft³/s, estimated, Mar. 2, 1938.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 15,200 ft³/s, Feb. 10, 1978, Mar. 2, 1983; maximum gage height, 7.64 ft, Mar. 2, 1983; no flow for many days in most years.