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 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: 07:20 AM Nov 12, 2013