USGS Water-Year Summary 2021
11015000 Sweetwater River near Descanso, CA
LOCATION - Lat 32°50'05", long 116°37'20" referenced to North American Datum of 1927, in NW 1/4 SE 1/4 sec.25, T.15 S., R.3 E., San Diego County, CA, Hydrologic Unit 18070304, near right bank, at Los Terrenitos Road Bridge, 0.7 mi downstream from unnamed tributary, and 1.3 mi south of Descanso.
DRAINAGE AREA - 45.4 mi².
- WSP 1315-B: 1922 (instantaneous maximum discharge). WDR CA-73-1: Drainage area.
PERIOD OF RECORD - October 1905 to September 1927 (monthly discharge only for some months, published in WSP 1315-B), October 1956 to current year. Prior to October 1927, records unadjusted for diversion. October 1956 to September 1977, both unadjusted records and combined records of river plus diversion (station 11015001) were published. No diversion since November 1976.
GAGE - Water-stage recorder. Datum of gage is 3,269.24 ft above NGVD of 1929. Prior to June 25, 1927, nonrecording gages at several sites and datums, upstream about 0.1 mi. Diversion gage at site 0.3 mi upstream, October 1956 to September 1984, at different datum.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 11,200 ft³/s, Feb. 16, 1927, gage height, 13.2 ft, from floodmarks, site and datum then in use, on basis of slope-area measurement of peak flow; no flow many days in most years.