West Branch Susquehanna River at Watsontown, Northumberland County PA (WATP1)
Gage Location: Northumberland County, PennsylvaniaSite Location: Northumberland County, Pennsylvania
Latitude: 41.082Longitude: -76.864Elevation: 440 ft. MSLDrainage Area: 65473 Sq. Mi.
Minor Stage: 23 ft. Moderate Stage: 25 ft.Major Stage: 29 ft.
First Flood: 1936-03-12Last Flood: 2011-09-08 Crest: 26.7 ft.Datum change: 1936-01-01Number of Floods: 12

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Date of FloodCrest(ft)Streamflow(cfs)CategoryCode
1936-03-1227.5-9999ModerateC1
1936-03-1836.25-9999MajorC1
1940-04-0124.75-9999MinorC1
1942-03-3124.75-9999MinorC1
1946-05-2930.5-9999MajorC1
1948-04-1524.25-9999MinorC1
1950-11-2628.6-9999ModerateC1
1972-06-2337.5-9999MajorC1
1996-01-2028.5-9999ModerateC1
2004-09-1928.8-9999ModerateC1
2010-12-0224.3-9999MinorC1
2011-09-0826.7-9999ModerateC1



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