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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
11180825 San Lorenzo Creek above Don Castro Reservoir, near Castro Valley, CA
LOCATION - Lat 37°41'43", long 122°02'38" referenced to North American Datum of 1927, Alameda County, CA, Hydrologic Unit 18050004, in San Lorenzo Grant, on right bank at Interstate Highway 580, 0.3 mi southeast of Independent School, and 2.2 mi east of Castro Valley.
DRAINAGE AREA - 18 mi².
REVISIONS HISTORY - WDR CA-98-2 (discharges).
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1980 to September 1994, October 1997 to current year.
WATER TEMPERATURE: Water years 1981-94, 1998-2003.
SEDIMENT DATA: Water years 1981-94, 1998-2003.
GAGE - Water-stage recorder. Datum of gage is 235.89 ft above NAVD of 1988. October 1980 to September 1994 at site 250 ft downstream at same datum.
REMARKS - Some regulation of low flow by ponds upstream from station.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 3,890 ft³/s, Feb. 3, 1998, gage height, 15.48 ft; maximum gage height, 17.64 ft, Dec. 31, 2022; no flow for many days in some years.
