USGS Water-Year Summary 2021
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.
- WSP 2129: 1962 (instantaneous maximum discharge), 1963 (peaks above base), 1965 (peaks above base). WDR CA-76-2: Drainage area.
PERIOD OF RECORD - October 1916 to September 1919 (published as "near Decoto"), April 1959 to current year.
GAGE - Water-stage recorder and concrete control. Elevation of gage is 85.12 ft above NGVD of 1929. Prior to Apr. 1, 1959, at site 1.4 mi downstream at different datum.
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.