USGS Surface Water for California: Peak Streamflow

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Peak Streamflow for California

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Contra Costa County, California

Hydrologic Unit Code 18050001

Latitude 37°56'43", Longitude 122°02'55" NAD27

Drainage area 85.2 square miles

Gage datum 35.44 feet above NGVD29

Water Year	Date	Gage Height (feet)	Stream- flow (cfs)
1969	1969-01-26	10.75	6,030^C
1970	1970-01-21	10.65	5,900^C
1971	1970-12-04	7.17	2,630^C
1972	1972-02-05	4.47	488^C
1973	1973-02-27	14.00	8,800^C
1974	1973-12-01	8.50	3,670^C
1975	1975-03-21	12.75	7,870^C
1976	1976-02-29	4.84	720^C
1977	1977-01-02	5.68	1,400^C
1978	1978-01-16	10.83	6,110^C
1979	1979-01-11	7.73	3,060^C
1980	1980-01-13	11.57	6,810^C
1981	1981-01-27	5.14	935^C
1982	1982-01-05	19.10	13,300^C
1983	1983-03-13	13.89	8,900^C
1984	1983-11-24	8.21	3,690^C
1985	1984-11-24	10.98	6,250^C
1986	1986-02-17	13.35	8,410^C
1987	1987-02-13	8.89	4,310^C
1988	1987-10-28	7.93	3,390^C
1989	1988-11-23	5.02	836^C
1990	1990-02-16	9.07	4,480^C
1991	1991-03-04	5.63	1,350^C
1992	1992-02-12	9.33	4,730^C
1997	1997-01-22	15.20	9,970^7,C

Peak Streamflow Qualification Codes.

7 -- Discharge is an Historic Peak
C -- All or part of the record affected by Urbanization, Mining, Agricultural changes, Channelization, or other

USGS 11183600 WALNUT C A CONCORD CA