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 during this period may be incomplete and therefore was not used in frequency calculations. Some of the floods are based on current flood stage and nearby gage information.
C2|Crest information during this period 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: 07:31 AM Dec 19, 2014