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Water-Year Summary for Site 11087020

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Water year 2021: 2021-10-01 to 2022-09-30

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USGS Water-Year Summary 2021
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.
REMARKS - Flow regulated by several reservoirs, combined capacity, 123,000 acre-ft. Many diversions upstream from station for irrigation, power development, and ground-water replenishment. Colorado River water released to the San Gabriel River at site 14.9 mi upstream from gage, at Metropolitan Water District aqueduct crossing on San Dimas Creek for ground-water replenishment. Los Angeles County Department of Public Works diversion from San Gabriel River below Santa Fe Dam (11085000) to Rio Hondo during water year:
 2014 - no diversion
 2015 - no diversion
 2016 -      801 acre-feet
 2017 - 53,700 acre-feet
 2018 -   6,480 acre-feet
 2019 - 50,100 acre-feet
 2020 - 34,500 acre-feet

See schematic diagram of San Gabriel River and Los Angeles River Basins available from the California Water Science Center.
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.