USGS Water-Year Summary 2021
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.
- WDR CA-98-2 (discharges).
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. Elevation of gage is 260 ft above NGVD of 1929, from topographic map. October 1980 to September 1994 at site 250 ft downstream at same datum.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 3,890 ft³/s, Feb. 3, 1998, gage height, 15.48 ft; no flow for many days in some years.