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Water-Year Summary for Site 11135800

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  • 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 2021: 2021-10-01 to 2022-09-30

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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.
REMARKS - No flow water years 2014-2016.  No regulation upstream from station. Pumping for irrigation of about 1,000 acres upstream from station.
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.

CHEMICAL DATA: Water years 2005 to current year.

REMARKS - No flow for 2014-2016 Water Years. The practice of assigning qualitative accuracy ratings to water-quality data was discontinued in WY2017. Discrete water-quality sample results and supporting metadata are published on NWISweb. Data-Quality Indicator Code of "R" indicates reviewed and approved data. DQI Status of "S" indicates provisional data.