USGS Water-Year Summary 2020
11180700 Alameda Creek Flood Channel at Union City, CA
LOCATION - Lat 37°35'09", long 122°02'50" referenced to North American Datum of 1927, Alameda County, CA, Hydrologic Unit 18050004, in Potrero de los Cerritos Grant, on right bank, 0.1 mi downstream from effluence from Alameda Creek, 0.2 mi upstream from bridge on Interstate 880 (Nimitz Freeway), and 2.0 mi southwest of Decoto District in Union City.
DRAINAGE AREA - Indeterminate.
PERIOD OF RECORD - October 1958 to current year. Published as "Patterson Creek at Union City" 1958-2001.
GAGE - Water-stage recorder and crest stage gage. Datum of gage is 4.13 ft above NGVD of 1929. Prior to Oct. 26, 1966, at site 0.2 mi downstream at same datum.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 25,800 ft³/s, Feb. 3, 1998, gage height, 20.43 ft; no flow at times in most years.