West Branch Susquehanna River at Williamsport, Lycoming County PA (WILP1)
Gage Location: Lycoming County, PennsylvaniaSite Location: Lycoming County, Pennsylvania
Latitude: 41.236Longitude: -76.907Elevation: 494.98 ft. MSLDrainage Area: 5682 Sq. Mi.
Minor Stage: 20 ft. Moderate Stage: 21 ft.Major Stage: 30 ft.
First Flood: 1865-03-17Last Flood: 2011-04-28 Crest: 20.27 ft.Datum change: 1928-10-01Number of Floods: 39

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Date of FloodCrest(ft)Streamflow(cfs)CategoryCode
1865-03-1727.5-9999ModerateC1 C4
1889-06-0132.4252000MajorC1
1894-05-2131-9999MajorC1 C4
1898-03-2421141000ModerateC1
1901-12-1520.7138000MinorC1
1902-03-0121.7149000ModerateC1
1904-03-0421141000ModerateC1
1909-05-0121141000ModerateC1
1913-03-2720.4135000MinorC1
1916-03-2920.5136000MinorC1
1916-06-1721141000ModerateC1
1918-02-2121.4145000ModerateC1
1919-05-2220.9140000MinorC1
1920-03-1320.4135000MinorC1
1923-03-0521.6147000ModerateC1
1936-03-1223.6164000Moderatenone
1936-03-1833.57264000Majornone
1940-04-0122.73146000Moderatenone
1942-12-3123.03148000Moderatenone
1946-05-2829.63223000Moderatenone
1948-04-1520.63124000Minornone
1950-11-2628.11206000Moderatenone
1951-03-3120.15119000Minornone
1956-03-0920.37121000Minornone
1959-01-2222.99150000Moderatenone
1960-04-0120.92127000Minornone
1961-02-2621.68136000Moderatenone
1964-03-1127.25197000ModerateF2
1972-06-2334.75279000MajorF2
1975-09-2624.7169000ModerateF2
1979-03-0622.73147000ModerateF2
1984-02-1525.59178000ModerateF2
1993-04-0120.52122000MinorF2
1996-01-2026.71191000ModerateF2
2004-09-1827.79203000ModerateF2
2010-01-2620.12118000MinorF2
2010-03-1424.9-9999MinorF2
2010-12-0223.25143000ModerateF2
2011-04-2820.27120000MinorF2



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