Warning: Javascript must be enabled to use all the features on this page!

Page Loading - Please Wait...

Click to hideNews Bulletins

Water-Year Summary for Site 11092450

Click to hide Water-Year Summary instructions and information
  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
  • For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
  • For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
  • For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
  • Not all sites have reports available for every water year.
Available Parameters
00060 Discharge(Mean)  

Water year 2023: 2022-10-01 to 2023-09-30

Print this page
USGS Water-Year Summary 2023
11092450 Los Angeles River at Sepulveda Dam, CA
LOCATION - Lat 34°09'42", long 118°27'57" referenced to North American Datum of 1927, in sec.00, T.1 N., R.15 W., Los Angeles County, CA, Hydrologic Unit 18070105, in Mission de San Fernando Grant, on right bank of outlet channel, 0.6 mi downstream from Sepulveda Dam, 200 ft upstream from Sepulveda Boulevard in city of Los Angeles, and 1.8 mi southwest of Van Nuys.
DRAINAGE AREA - 158 mi².
PERIOD OF RECORD - January 1929 to February 1938, May 1938 to September 1979, October 2002 to current year. See WSP 1315-B and 1735 for history of records prior to September 1950.
GAGE - Water-stage recorder and concrete-lined flood-control channel. Datum of gage is 655.13 ft above NAVD of 1988. See WSP 1735 for history of changes prior to Aug. 29, 1953.
REMARKS - Flow regulated since December 1941 by Sepulveda Flood-Control Reservoir, capacity, 17,400 acre-ft. Some diversion above station. At times, the city of Los Angeles discharges imported Owens River water into the Los Angeles River from upstream distributing reservoirs. Since 1998, most of the base flow at this station represents releases of treated effluent from the city of Los Angeles Donald C. Tillman Water Reclamation Plant, located upstream of Sepulveda Dam. Such releases are discharged to the river approximately 300 ft downstream of Sepulveda Dam. See schematic diagram of San Gabriel River and Los Angeles River Basins available from the California Water Science Center.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Mar. 2, 1938, 12,000 ft³/s, estimated.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 19,600 ft³/s, Mar. 20, 2011, gage height, 14.79 ft; no flow on Sept. 19, 20, 1930.