West Branch Susquehanna River at Milton, Union County PA (ILTP1)
Gage Location: Union County, Pennsylvania Site Location: Northumberland County, Pennsylvania
Latitude: 41.082Longitude: -76.864Elevation: 434 ft. MSLDrainage Area: 6632 Sq. Mi.
Minor Stage: 19 ft. Moderate Stage: 22 ft.Major Stage: 25 ft.
First Flood: 1817-08-09Last Flood: 2011-09-08 Crest: 26.6 ft.Datum change: 1994-11-01Number of Floods: 35

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Date of FloodCrest(ft)Streamflow(cfs)CategoryCode
1817-08-09-9999-9999MissingC8 G2
1875-03-17-9999-9999MissingC8 G2
1889-06-0131.1-9999MajorC8 G2
1902-03-0121.85-9999MinorC8 G2
1913-03-2819.55-9999MinorC8 G2
1918-02-0120.55-9999MinorC8 G2
1923-03-0520.75-9999MinorC8 G2
1936-03-1222.85-9999ModerateG2
1936-03-1834.07-9999MajorG2
1940-03-3121.95-9999MinorG2
1946-05-2930.43-9999MajorG2
1950-11-2628.2-9999MajorG2
1956-03-0821-9999MinorG2
1960-03-3122.2-9999ModerateG2
1964-03-1028.24-9999MajorG2
1972-03-0320.15-9999MinorG2
1972-06-2434.55-9999MajorG2
1975-09-2729.5-9999MajorG2
1979-03-0625-9999MajorG2
1981-02-2420.4-9999MinorG2
1982-02-2321.4-9999MinorG2
1984-02-1525.8-9999MajorG2
1986-03-1519.5-9999MinorG2
1993-04-0222.1-9999ModerateG2
1994-03-2619-9999MinorG2
1994-08-1919.25-9999MinorG2
1996-01-2027.5-9999MajorG2
1996-11-0920.62-9999MinorC2 G2
2004-09-1927.94-9999MajorC2 G2
2005-04-0320.11-9999MinorC2 G2
2010-01-2620.7-9999MinorC2 G2
2010-12-0222.76-9999ModerateC2 G2
2011-03-1121.72-9999MinorC2 G2
2011-04-2921.03-9999MinorC2 G2
2011-09-0826.6-9999MajorC2 G2



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