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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
11180500 Dry Creek at Union City, CA
LOCATION - Lat 37°36'22", long 122°01'22" referenced to North American Datum of 1927, Alameda County, CA, Hydrologic Unit 18050004, Mt. Diablo meridian, in Arroyo de la Alameda Grant, on right bank, 900 ft downstream from bridge on State Highway 238 in Decoto District in Union City, and 1.7 mi upstream from mouth.
DRAINAGE AREA - 9.39 mi².
REVISIONS HISTORY - WSP 2129: 1962 (instantaneous maximum discharge), 1963 (peaks above base), 1965 (peaks above base). WDR CA-76-2: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1916 to September 1919 (published as "near Decoto"), April 1959 to current year.
GAGE - Water-stage recorder and concrete control. Datum of gage is 87.67 ft above NAVD of 1988. Prior to Apr. 1, 1959, at site 1.4 mi downstream at different datum.
REMARKS - No regulation or diversion upstream from station. See schematic diagram of Alameda Creek Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 1,680 ft³/s, Jan. 9, 1995, gage height, 5.32 ft, from rating curve extended above 600 ft³/s, on basis of slope-area measurement of peak flow; no flow for many days each year.
