USGS Water-Year Summary 2021
11181008 Castro Valley Creek at Hayward, CA
LOCATION - Lat 37°40'48", long 122°04'46" referenced to North American Datum of 1927, Alameda County, CA, Hydrologic Unit 18050004, in San Lorenzo Grant, on left bank, 500 ft east of Hayward City Hall, 700 ft upstream from San Lorenzo Creek, and 700 ft downstream from small left-bank tributary.
DRAINAGE AREA - 5.51 mi².
- WDR-US-2013: 2013 NWISWEB (discharges). On May 27, 2014, discharge records were revised for the period of Oct. 22, 2012, to Feb. 19, 2013.
PERIOD OF RECORD - October 1971 to current year (seasonal records only, water years 1975-77).
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 101.15 ft above NAVD of 1988.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 1,550 ft³/s, Feb. 2, 1998, gage height, 9.12 ft, from rating curve extended above 61 ft³/s, on basis of slope-area measurement at gage height 3.92 ft, and step-backwater computation to gage height 10.40 ft; no flow at times.