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

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MINOR FLOODS Date of Flood Crest(ft) 1902-03-01 21.85 1913-03-28 19.55 1918-02-01 20.55 1923-03-05 20.75 1940-03-31 21.95 1956-03-08 21 1972-03-03 20.15 1981-02-24 20.4 1982-02-23 21.4 1986-03-15 19.5 1994-03-26 19 1994-08-19 19.25 1996-11-09 20.62 2005-04-03 20.11 2010-01-26 20.7 2011-03-11 21.72 2011-04-29 21.03

MODERATE FLOODS Date of Flood Crest(ft) 1936-03-12 22.85 1960-03-31 22.2 1993-04-02 22.1 2010-12-02 22.76

MAJOR FLOODS Date of Flood Crest(ft) 1889-06-01 31.1 1936-03-18 34.07 1946-05-29 30.43 1950-11-26 28.2 1964-03-10 28.24 1972-06-24 34.55 1975-09-27 29.5 1979-03-06 25 1984-02-15 25.8 1996-01-20 27.5 2004-09-19 27.94 2011-09-08 26.6

MISSING Date of Flood Crest(ft) 1817-08-09 -9999 1875-03-17 -9999

Categorical Floods by Month Month Minor After Datum Minor Total Moderate After Datum Moderate Total Major After Datum Major Total Missing After Datum Missing Total January 1 1 0 0 1 1 0 0 February 0 3 0 0 0 1 0 0 March 1 9 0 2 0 3 0 1 April 2 2 0 1 0 0 0 0 May 0 0 0 0 0 1 0 0 June 0 0 0 0 0 2 0 0 July 0 0 0 0 0 0 0 0 August 0 1 0 0 0 0 0 1 September 0 0 0 0 2 3 0 0 October 0 0 0 0 0 0 0 0 November 1 1 0 0 0 1 0 0 December 0 0 1 1 0 0 0 0

Categorical Floods by Season Season Minor Moderate Major Missing Fall 1 0 4 0 Winter 4 1 2 0 Spring 11 3 4 1 Summer 1 0 2 1

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