Susquehanna River at Sunbury, Snyder County PA (SBYP1)
Gage Location: Snyder County, PennsylvaniaSite Location: Snyder County, Pennsylvania
Latitude: 40.834Longitude: -76.827Elevation: 408.61 ft. MSLDrainage Area: 18300 Sq. Mi.
Minor Stage: 24 ft. Moderate Stage: 26 ft.Major Stage: 34 ft.
First Flood: 1936-03-19Last Flood: 2011-09-08 Crest: 31.66 ft.Datum change: 1967-03-24Number of Floods: 14

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Date of FloodCrest(ft)Streamflow(cfs)CategoryCode
1936-03-1926.85556000ModerateC1 G1
1972-06-2435.8620000MajorF2
1975-09-2730.62439000ModerateF2
1979-03-0727.52347000ModerateF2
1984-02-1626.96332000ModerateF2
1986-03-1624.9281000MinorF2
1993-04-0227333000ModerateF2
1996-01-2030.32424000ModerateF2
2004-09-1930.44427000ModerateF2
2005-04-0426.15312000ModerateF2
2006-06-2826.89330000ModerateF2
2011-03-1226.01308000ModerateF2
2011-04-2925.57297000MinorF2
2011-09-0831.66463000ModerateF2



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