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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Height Above Flood Stage for Entire Period of Record
Height Above FSTotal OccurencePercent of Crest OccurrenceCumulative Total Flood OccurrencePercent of Floods above Listed Value
24 ft to 25 ft17.124 ft or above 14100.0
25 ft to 26 ft17.125 ft or above 1392.9
26 ft to 27 ft535.726 ft or above 1285.7
27 ft to 28 ft214.327 ft or above 750.0
28 ft to 29 ft00.028 ft or above 535.7
29 ft to 30 ft00.029 ft or above 535.7
30 ft to 31 ft321.430 ft or above 535.7
31 ft to 32 ft17.131 ft or above 214.3
32 ft to 33 ft00.032 ft or above 17.1
33 ft to 34 ft00.033 ft or above 17.1
34 ft to 35 ft00.034 ft or above 17.1
35 ft to 36 ft17.135 ft or above 17.1
Height Above Flood Stage After Datum Change
Height Above FSTotal OccurencePercent of Crest OccurrenceCumulative Total Flood OccurrencePercent of Floods above Listed Value
24 ft to 25 ft17.724 ft or above 13100.0
25 ft to 26 ft17.725 ft or above 1292.3
26 ft to 27 ft430.826 ft or above 1184.6
27 ft to 28 ft215.427 ft or above 753.8
28 ft to 29 ft00.028 ft or above 538.5
29 ft to 30 ft00.029 ft or above 538.5
30 ft to 31 ft323.130 ft or above 538.5
31 ft to 32 ft17.731 ft or above 215.4
32 ft to 33 ft00.032 ft or above 17.7
33 ft to 34 ft00.033 ft or above 17.7
34 ft to 35 ft00.034 ft or above 17.7
35 ft to 36 ft17.735 ft or above 17.7





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