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 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