Susquehanna River at Harrisburg, Dauphin County PA (HARP1)
Gage Location: Dauphin County, PennsylvaniaSite Location: Dauphin County, Pennsylvania
Latitude: 40.255Longitude: -76.886Elevation: 290.01 ft. MSLDrainage Area: 24100 Sq. Mi.
Minor Stage: 17 ft. Moderate Stage: 20 ft.Major Stage: 23 ft.
First Flood: 1786-10-05Last Flood: 2011-09-09 Crest: 25.17 ft.Datum change: 1928-10-01Number of Floods: 48

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Date of FloodCrest(ft)Streamflow(cfs)CategoryCode
1786-10-05-9999-9999MissingC1
1846-03-1522482000ModerateC1
1865-03-1824.6573000MajorC1
1868-03-1920417000ModerateC1
1886-01-0619.02385000MinorC1
1889-06-0226.8654000MajorC1
1891-02-1919.7408000MinorC1
1894-05-2225.7613000MajorC1
1902-03-0322.94449000ModerateC1 C5
1904-03-0820.84298000ModerateC1 C5
1910-03-0317.2332000MinorC1
1913-03-2819.54402000MinorC1
1914-03-3018.1358000MinorC1
1916-03-2918.8379000MinorC1
1920-03-1320.2423000ModerateC1
1924-04-0817324000MinorC1
1925-02-1318.8379000MinorC1
1926-11-1717323500MinorC1
1936-03-1929.23740000Majornone
1940-04-0219.75418000Minornone
1943-01-0119.4412000Minornone
1946-05-2921.8494000Moderatenone
1950-11-2719.34416000Minornone
1960-04-0218.2382000Minornone
1961-02-2718.48392000Minornone
1964-03-1221.51484000Moderatenone
1971-02-1618.03-9999Minornone
1972-06-2433.271020000Majornone
1975-02-2618.19375000Minornone
1975-09-2723.82529000Majornone
1979-03-0720.43416000Moderatenone
1982-02-0517.64-9999Minornone
1983-12-1517.55328000Minornone
1984-02-1620.74426000Moderatenone
1984-04-0718.88368000Minornone
1986-03-1618.53357000Minornone
1993-04-0220.5410000Moderatenone
1994-03-2617.9334000Minornone
1996-01-2025.08568000MajorC7
1998-01-1017.27316000Minornone
2004-09-1924.4557000Majornone
2005-03-3017.43321000Minornone
2005-04-0418.87360000Minornone
2006-06-2919.66383000Minornone
2008-03-0617.4320000Minornone
2011-03-1220.09397000Moderatenone
2011-04-2918.37346000Minornone
2011-09-0925.17590000Majornone



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: 08:00 PM May 28, 2014