USGS Water-Year Summary 2021
11135800 San Antonio Creek at Los Alamos, CA
LOCATION - Lat 34°44'36", long 120°16'12" referenced to North American Datum of 1927, Santa Barbara County, CA, Hydrologic Unit 18060009, in Los Alamos Grant, on left bank, 15 ft upstream from concrete box culvert on service road parallel to U.S. Highway 101, at Los Alamos.
DRAINAGE AREA - 34.9 mi².
PERIOD OF RECORD - October 1970 to September 1992, October 1997 to September 1999, October 2003 to current year.
GAGE - Water-stage recorder. Elevation of gage is 580 ft above NGVD of 1929, from topographic map.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 3,230 ft³/s, Mar. 1, 1983, gage height, 11.6 ft, from flood marks, from rating curve extended above 150 ft³/s on basis of computation of peak flow through culverts; maximum gage height, 14.53 ft, Feb. 3, 1998 (backwater from debris dam); no flow for most of each year.
PERIOD OF RECORD
DISCRETE WATER-QUALITY DATA:
CHEMICAL DATA: Water years 2005 to current year.