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DESCRIPTION:

Latitude 37°52'24",   Longitude 121°43'34"   NAD27

Contra Costa County, California, Hydrologic Unit 18040003

Drainage area: 42.6 square miles

Datum of gage: 177.87 feet above   NGVD29.

AVAILABLE DATA:

Data Type	Begin Date	End Date	Count
Daily Data
Discharge, cubic feet per second	1953-04-01	1983-09-29	11139
Daily Statistics
Discharge, cubic feet per second	1953-04-01	1983-09-29	11139
Monthly Statistics
Discharge, cubic feet per second	1953-04	1983-09
Annual Statistics
Discharge, cubic feet per second	1953	1983
Peak streamflow	1954-02-14	1983-03-13	30
Field/Lab water-quality samples	1970-12-01	1970-12-02	3
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