Antietam Creek near Sharpsburg, Washington County MD (SACM2)
Gage Location: Washington County, Maryland	Site Location: Washington County, Maryland
Latitude: 39.45	Longitude: -77.73	Elevation: 311.05 ft. MSL	Drainage Area: 281 Sq. Mi.
Minor Stage: 8 ft.	Moderate Stage: 10 ft.	Major Stage: 12 ft.
First Flood: 1928-07-11	Last Flood: 2012-10-31 Crest: 9.89 ft.	Datum change: 2011-03-16	Number of Floods: 31

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Year Before Datum Change	Number of Floods
1928	1
1929	1
1930	0
1931	1
1932	0
1933	1
1934	1
1935	0
1936	1
1937	1
1938	0
1939	0
1940	0
1941	0
1942	0
1943	0
1944	1
1945	0
1946	0
1947	0
1948	0
1949	1
1950	1
1951	0
1952	2
1953	0
1954	1
1955	0
1956	1
1957	0
1958	0
1959	0
1960	0
1961	0
1962	0
1963	0
1964	0
1965	0
1966	0
1967	0
1968	0
1969	0
1970	0
1971	0
1972	1
1973	0
1974	0
1975	1
1976	1
1977	0
1978	0
1979	1
1980	0
1981	0
1982	0
1983	0
1984	1
1985	1
1986	0
1987	0
1988	0
1989	0
1990	0
1991	0
1992	1
1993	0
1994	0
1995	0
1996	1
1997	0
1998	1
1999	0
2000	0
2001	0
2002	0
2003	1
2004	0
2005	1
2006	1
2007	0
2008	0
2009	0
2010	1

Year After Datum Change	Number of Floods
2011	3
2012	1
2013	0

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