Potomac River at Harpers Ferry, Jefferson County WV (HFEW2)
Gage Location: Jefferson County, West VirginiaSite Location: Jefferson County, West Virginia
Latitude: 39.324Longitude: -77.728Elevation: 245.53 ft. MSLDrainage Area: 6313 Sq. Mi.
Minor Stage: 18 ft. Moderate Stage: 21 ft.Major Stage: 24 ft.
First Flood: 1877-11-25Last Flood: 2011-05-19 Crest: 19.14 ft.Datum change: 1986-12-01Number of Floods: 42

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Date of FloodCrest(ft)Streamflow(cfs)CategoryCode
1877-11-2529.2-9999MajorG2
1889-06-0134.8-9999MajorG2
1891-04-0119.6-9999MinorG2
1893-05-0521-9999ModerateG2
1896-10-0133-9999MajorG2
1897-02-2426.5-9999MajorG2
1898-08-1119.5-9999MinorG2
1899-03-0618.7-9999MinorG2
1901-04-2222.2-9999ModerateG2
1902-02-2124.4-9999MajorG2
1902-03-0227-9999MajorG2
1908-01-1319.9-9999MinorG2
1908-02-1618.5-9999MinorG2
1910-01-1721.2-9999ModerateG2
1913-03-2818.6-9999MinorG2
1924-03-0919-9999MinorG2
1924-03-3020.7-9999MinorG2
1924-05-1327.6-9999MajorC8 G2
1928-05-0218.9-9999MinorG2
1929-04-1721.3-9999ModerateG2
1932-05-1320-9999MinorG2
1936-03-1936.5-9999MajorG2
1937-04-2729-9999MajorG2
1937-10-2721.5-9999ModerateG2
1942-05-2418.6-9999MinorG2
1942-10-1633.8-9999MajorG2
1945-09-1918.5-9999MinorG2
1949-06-1918.5-9999MinorG2
1950-12-0518.8-9999MinorG2
1954-10-1718.5-9999MinorG2
1955-08-2023.9-9999ModerateG2
1972-06-2327.7-9999MajorG2
1975-03-2321.5-9999ModerateG2
1976-10-1021.5-9999ModerateG2
1985-11-0630.1-9999MajorG2
1993-03-0620.8-9999MinorG2
1996-01-2129.4-9999MajorG2
1996-09-0829.8-9999MajorG2
2003-09-2019.84-9999MinorG2
2010-01-2618.4-9999MinorG2
2010-03-1520.78-9999MinorG2
2011-05-1919.14-9999MinorG2



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: 07:20 AM Nov 12, 2013