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.
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.
PERIOD OF RECORD
CONTINUOUS WATER-QUALITY DATA:
WATER TEMPERATURE: Water years October 2008 to current year.
INSTRUMENTATION - Water-quality monitor since Oct. 1, 2008.