Opequon Creek near Martinsburg, Berkeley County WV (MBGW2)
Gage Location: Berkeley County, West Virginia	Site Location: Berkeley County, West Virginia
Latitude: 39.424	Longitude: -77.939	Elevation: 354.89 ft. MSL	Drainage Area: 273 Sq. Mi.
Minor Stage: 10 ft.	Moderate Stage: 12.5 ft.	Major Stage: 15 ft.
First Flood: 1936-03-18	Last Flood: 2013-01-31 Crest: 12.04 ft.	Datum change: 1947-07-23	Number of Floods: 139

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Year Before Datum Change	Number of Floods
1936	1
1937	0
1938	0
1939	0
1940	0
1941	0
1942	0
1943	0
1944	0
1945	0
1946	0

Year After Datum Change	Number of Floods
1947	0
1948	2
1949	0
1950	3
1951	1
1952	3
1953	0
1954	0
1955	2
1956	0
1957	0
1958	0
1959	1
1960	0
1961	2
1962	1
1963	1
1964	1
1965	1
1966	0
1967	1
1968	1
1969	0
1970	1
1971	2
1972	7
1973	3
1974	1
1975	5
1976	2
1977	1
1978	5
1979	5
1980	1
1981	0
1982	1
1983	3
1984	6
1985	1
1986	1
1987	2
1988	3
1989	0
1990	3
1991	1
1992	3
1993	9
1994	4
1995	2
1996	11
1997	2
1998	6
1999	0
2000	0
2001	1
2002	0
2003	5
2004	1
2005	2
2006	1
2007	1
2008	3
2009	2
2010	4
2011	5
2012	1
2013	1

Codes and description

C1|Crest information looks unreliable and incomplete and not used in frequency calculations. Some of the floods are based on current flood stage and nearby gage information.
C2|Crest information looks reliable despite potential problems. This data was used in frequency calculations.
C3|Crest height estimated by the USGS.
C4|Crest height is from the National Weather Service.
C5|Crest height affected by backwater.
C6|Crest occurred at a previous flood stage that is lower than the current flood stage. The crests below the new flood stage are not used in flood frequency calculations.
C7|Crest from USGS yearly peak and/or date is different than the crest we provide. In many cases MARFC uses crest based on backwater or ice effects.
C8|Crest month or day of occurrence has been estimated by The Middle Atlantic River Forecast Center usually based on nearby gage information.
C9|Crest date (day) in the month is unknown.
F1|Flow is an estimate.
F2|Flow affected by regulation or diversion and in some cases to an unknown degree.
F3|Flow effected by snow-melt, ice jam or debris jam break up.
F4|Flow affected by dam failure.
F5|Flow - All or part of the record affected by urbanization, mining, agricultural changes, channelization or other factors.
G1|Gage height at a different site and/or datum.
G2|Gage is not an official USGS gage with crests provided by the NWS. Crest information looks unreliable and incomplete and not used in flood frequency calculations.
G3|Gage datum changed during this year.
none,No code; Good Data

Updated: 08:09 AM Feb 08, 2013