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Water-Year Summary for Site USGS 11181040

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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)  
80154 Suspnd sedmnt conc(Mean)  
80155 Suspnd sedmnt disch(Mean)  

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

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USGS Water-Year Summary 2021
11181040 San Lorenzo Creek at San Lorenzo, CA
LOCATION - Lat 37°41'03", long 122°08'20" referenced to North American Datum of 1927, Alameda County, CA, Hydrologic Unit 18050004, in San Lorenzo Grant, on left bank, 400 ft downstream from Washington Avenue Bridge in San Lorenzo, and 1.6 mi upstream from mouth.
DRAINAGE AREA - 44.6 mi².
REVISIONS HISTORY - On April 17, 2015, discharge records were revised for the period of May and June 2014.
PERIOD OF RECORD - October 1967 to September 1978, October 1987 to current year.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 6.13 ft above NGVD of 1929 and 8.45 ft above NAVD of 1988.
REMARKS - Flow partly regulated since October 1962 by Cull Creek Reservoir, capacity, 310 acre-ft, and since January 1965 by Don Castro Reservoir, capacity, 380 acre-ft, 7 mi upstream. A few very small diversions upstream from station.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 10,300 ft³/s, Feb. 3, 1998, gage height, 14.27 ft, from rating curve extended above 1,200 ft³/s; minimum daily, 0.01 ft³/s, several days in June and July 1977.

SEDIMENT DATA: Water years October 1989 to September 1993, October 2008 to current year (storm season only).

WATER TEMPERATURE: Water years October 1989 to September 1993, October 2008 to August 2013 (storm season only).
SEDIMENT DATA: Water years October 1989 to September 1993, October 2008 to current year (storm season only).