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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.
USGS Water-Year Summary 2024
11172945 Alameda Creek above Diversion Dam, near Sunol, CA
LOCATION - Lat 37°29'51", long 121°46'21" referenced to North American Datum of 1927, in NE 1/4 SE 1/4 sec.17, T.5 S., R.2 E., Alameda County, CA, Hydrologic Unit 18050004, on right bank, 700 ft upstream from diversion dam, and 9.3 mi southeast of Sunol.
DRAINAGE AREA - 33.3 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1994 to current year.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 909.17 ft above NAVD of 1988. Prior to June 29, 2009, at gage datum 2.00 ft lower.
REMARKS - No regulation or diversion upstream from gage. 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, gage height, 10.31 ft. Maximum gage height, 10.98 ft, Dec. 31, 2022. No flow at times during some years.
WATER-QUALITY RECORDS
PERIOD OF RECORD -
CONTINUOUS WATER-QUALITY DATA:
WATER TEMPERATURE: Water years October 2008 to current year.
INSTRUMENTATION - Water-quality monitor since October 2008.
REMARKS - Water temperature record for water years 2014 - 2016 rated excellent, some periods experienced no flow. The practice of assigning qualitative accuracy ratings to water-quality data was discontinued in WY2017.
EXTREMES FOR PERIOD OF RECORD - WATER TEMPERATURE: Maximum recorded, 24.4°C, August 16, 2020; minimum recorded, -0.2°C, Nov. 27, 2015.
