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Water-Year Summary for Site USGS 11101250

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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Available Parameters
00060 Discharge(Mean)  

Water year 2021: 2020-10-01 to 2021-09-30

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USGS Water-Year Summary 2021
11101250 Rio Hondo above Whittier Narrows Dam, CA
LOCATION - Lat 34°03'30", long 118°04'15" referenced to North American Datum of 1927, in sec.00, T.1 S., R.11 W., Los Angeles County, CA, Hydrologic Unit 18070105, in Potrero Grande Grant, on right bank, 0.3 mi downstream from Garvey Avenue, 0.4 mi downstream from Rubio Wash, 2.8 mi upstream from axis of Whittier Narrows Dam, and 2.2 mi west of El Monte.
DRAINAGE AREA - 91.2 mi².
PERIOD OF RECORD - February 1956 to current year.
GAGE - Water-stage recorder and concrete-lined trapezoidal channel. Datum of gage is 219.95 ft above NAVD of 1988.
COOPERATION - Records of diversion provided by the Los Angeles County Department of Public Works.
REMARKS - Flow regulated by Big Santa Anita, Sawpit, and Eaton Flood-Control Reservoirs, and Sierra Madre, Las Flores, and Rubio debris basins, combined capacity, 2,195 acre-ft. Many diversions upstream from station for domestic use and irrigation. 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
 2021 - 6,360   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, 18,200 ft³/s, Feb. 16, 1980, gage height, 7.35 ft; no flow at times in some years.