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

Click on table headers to sort

MINOR FLOODS Date of Flood Crest(ft) 1886-01-06 19.02 1891-02-19 19.7 1910-03-03 17.2 1913-03-28 19.54 1914-03-30 18.1 1916-03-29 18.8 1924-04-08 17 1925-02-13 18.8 1926-11-17 17 1940-04-02 19.75 1943-01-01 19.4 1950-11-27 19.34 1960-04-02 18.2 1961-02-27 18.48 1971-02-16 18.03 1975-02-26 18.19 1982-02-05 17.64 1983-12-15 17.55 1984-04-07 18.88 1986-03-16 18.53 1994-03-26 17.9 1998-01-10 17.27 2005-03-30 17.43 2005-04-04 18.87 2006-06-29 19.66 2008-03-06 17.4 2011-04-29 18.37

MODERATE FLOODS Date of Flood Crest(ft) 1846-03-15 22 1868-03-19 20 1902-03-03 22.94 1904-03-08 20.84 1920-03-13 20.2 1946-05-29 21.8 1964-03-12 21.51 1979-03-07 20.43 1984-02-16 20.74 1993-04-02 20.5 2011-03-12 20.09

MAJOR FLOODS Date of Flood Crest(ft) 1865-03-18 24.6 1889-06-02 26.8 1894-05-22 25.7 1936-03-19 29.23 1972-06-24 33.27 1975-09-27 23.82 1996-01-20 25.08 2004-09-19 24.4 2011-09-09 25.17

MISSING Date of Flood Crest(ft) 1786-10-05 -9999

Categorical Floods by Month Month Minor After Datum Minor Total Moderate After Datum Moderate Total Major After Datum Major Total Missing After Datum Missing Total January 2 3 0 0 1 1 0 0 February 4 6 1 1 0 0 0 0 March 4 8 3 8 1 2 0 0 April 5 6 1 1 0 0 0 0 May 0 0 1 1 0 1 0 0 June 1 1 0 0 1 2 0 0 July 0 0 0 0 0 0 0 0 August 0 0 0 0 0 0 0 0 September 0 0 0 0 3 3 0 0 October 0 0 0 0 0 0 0 1 November 1 2 0 0 0 0 0 0 December 1 1 0 0 0 0 0 0

Categorical Floods by Season Season Minor Moderate Major Missing Fall 2 0 3 1 Winter 10 1 1 0 Spring 14 10 3 0 Summer 1 0 2 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