USGS Water-Year Summary 2021
11172955 Alameda Creek below Diversion Dam, near Sunol CA
LOCATION - Lat 37°29'55", long 121°46'46" referenced to North American Datum of 1983, in SW 1/4 NE 1/4 sec.17, T.5 S., R.2 E., Alameda County, CA, Hydrologic Unit 18050004, on right bank, 1,400 ft downstream of diversion dam, 3.1 mi upstream of confluence with Calaveras Creek, and 9 mi southeast of Sunol.
DRAINAGE AREA - 34.9 mi².
- Discharge for the period March 3, 2020 to April 5, 2020 was revised on Aug. 14, 2020, based on changes to the stage-discharge rating.
PERIOD OF RECORD - October 2010 to current year.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 835.55 ft above NAVD of 1988.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 5,730 ft³/s, Jan. 10, 2017, estimated from upstream site 11172945, gage height not determined; no flow at times during some years.
PERIOD OF RECORD
CONTINUOUS WATER-QUALITY DATA:
WATER TEMPERATURE: Water years November 2015 to current year.
INSTRUMENTATION - Water-quality monitor since Nov. 23, 2015.
EXTREMES FOR PERIOD OF RECORD - WATER TEMPERATURE: Maximum recorded, 25.6°C, August 16, 2020; minimum recorded, 5.0°C, Nov. 29, 2015.