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Water-Year Summary for Site USGS 11173500

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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.
  • For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
  • For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
  • Not all sites have reports available for every water year.
Available Parameters
00010 Temperature, water(Mean,Min.,Max.,Med.)  
00060 Discharge(Mean)  

Water year 2021: 2021-10-01 to 2022-09-30

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USGS Water-Year Summary 2021
11173500 Calaveras Creek near Sunol, CA
LOCATION - Lat 37°30'07", long 121°49'06" referenced to North American Datum of 1983, in NE 1/4 NW 1/4 sec.13, T.5 S., R.1 E., Alameda County, CA, Hydrologic Unit 18050004, on right bank, 4,000 ft downstream from Calaveras Dam, and 7.5 mi southeast of Sunol.
DRAINAGE AREA - 98.8 mi².
PERIOD OF RECORD - April 1898 to September 1908, June 1910 to June 1930 (records furnished by Spring Valley Water Company). May 2002 to current year. Monthly flows for water years 1898-1930 published in WSP 1315-B. Water years 1920-24, daily and monthly discharges published in WSP 591. Water years 1925-29, daily flows published in WSP 611, 631, 651, 671, 721. Station reestablished May 23, 2002, by U.S. Geological Survey.
GAGE - Water-stage recorder, concrete control and bank-operated cableway. Elevation of gage is 520 ft above NGVD of 1929, from topographic map. Prior to 1913 at site 1,400 ft upstream from current location at different datum. 1913-30 at site 1,500 ft upstream from current location at different datum. May 2002 to November 2012, 1,000 ft upstream from current location at different datum.
REMARKS - Flow regulated by Calaveras Reservoir beginning in 1916, usable capacity, 96,800 acre-ft. Dam completed in 1925. Dead storage, 3,200 acre-ft. Flow is diverted out of basin from Calaveras Reservoir by city and county of San Francisco for domestic use. See schematic diagram of Alameda Creek Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum mean daily discharge prior to start of regulation: 6,980 ft³/s, Nov. 21, 1900. Maximum instantaneous discharge since start of continuous record on May 23, 2002; 1,070 ft³/s, Apr. 25, 2006, gage height, 8.96 ft. Peak gage height, 9.32 ft, Feb. 21, 2017 and Feb. 22, 2017. No flow many days most years since construction of Calaveras Dam began in 1916. No instantaneous maximum or minimum flow data are available prior to May 2002.

WATER TEMPERATURE: Water years October 2008 to current year.

INSTRUMENTATION - Water-quality monitor since Oct. 1, 2008.
REMARKS - Water temperature record for 2014-2016 water years rated excellent. The practice of assigning qualitative accuracy ratings to water-quality data was discontinued in WY2017.