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 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