USGS Water-Year Summary 2017
11087020 San Gabriel River above Whittier Narrows Dam, CA
LOCATION - Lat 34°02'03", long 118°02'14" referenced to North American Datum of 1927, Los Angeles County, CA, Hydrologic Unit 18070106, in La Puente Grant, at Peck Road, 0.8 mi downstream from San Jose Flood Channel, 1.2 mi upstream from axis of Whittier Narrows Dam, and 1.8 mi south of El Monte.
DRAINAGE AREA - 442 mi².
REVISIONS HISTORY - WDR CA-86-1: Drainage area.
PERIOD OF RECORD - October 1955 to September 1957, October 1963 to current year.
GAGE - Water-stage recorder and crest-stage gage. Elevation of gage is 220 ft above NGVD of 1929, from topographic map.
COOPERATION - Records of diversion to Rio Hondo provided by Los Angeles County Department of Public Works.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 46,600 ft³/s, Jan. 25, 1969, gage height, 10.90 ft, from rating curve extended above 29,000 ft³/s; no flow for part of some years.