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Water-Year Summary for Site USGS 11172955

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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.
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  • Not all sites have reports available for every water year.
Available Parameters
00010 Temperature, water(Max.,Med.,Mean,Min.)  
00060 Discharge(Mean)  

Water year 2023: 2023-10-01 to 2024-09-30

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USGS Water-Year Summary 2023
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.
REVISIONS HISTORY - 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. 
REMARKS - Diversion 1,400 ft upstream from gage diverts water from Alameda Creek to Calaveras Reservoir. See schematic diagram of Alameda Creek Basin available from the California Water Science Center.
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.

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.