North Branch Susquehanna River at Unadilla, Otsego County NY (UNDN6)
Gage Location: Otsego County, New YorkSite Location: Otsego County, New York
Latitude: 42.322Longitude: -75.317Elevation: 997.25 ft. MSLDrainage Area: 982 Sq. Mi.
Minor Stage: 11 ft. Moderate Stage: 13 ft.Major Stage: 14.5 ft.
First Flood: 1935-07-08Last Flood: 2011-09-08 Crest: 16.34 ft.Datum change: 1938-07-01Number of Floods: 56

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Date of FloodCrest(ft)Streamflow(cfs)CategoryCode
1935-07-081629000MajorC1 C8
1936-03-1816.631300MajorC1
1938-09-2213.7621000Moderatenone
1939-02-2111.915600Minornone
1940-03-3113.5420300Moderatenone
1940-04-0912.2516500Minornone
1942-03-1812.0916100Minornone
1942-12-3013.9421500Moderatenone
1943-05-1811.8615500Minornone
1944-03-1811.4814400Minornone
1946-03-0811.1813700Minornone
1946-05-2811.0813400Minornone
1947-04-0611.1513600Minornone
1948-03-1711.2113700Minornone
1948-03-2213.1819200Moderatenone
1948-12-3111.4914500Minornone
1950-03-2911.4614400MinorF2
1955-10-1711.0911800MinorF2
1956-03-0911.0612600MinorF2
1956-04-0612.3816000MinorF2
1956-04-1711.3213300MinorF2
1958-04-0811.7114200MinorF2
1959-01-2213.4217000ModerateC5 F2
1959-11-2911.7914400MinorF2
1960-04-0111.9714900MinorF2
1960-04-0414.2521200ModerateF2
1961-02-2611.6614100MinorF2
1962-04-0212.8317200MinorF2
1963-03-2712.6216600MinorF2
1964-03-0613.1718200ModerateF2
1977-03-1414.6423500MajorF2
1977-03-3111.1813600MinorF2
1977-09-2111.8215200MinorF2
1977-10-1814.1321900ModerateF2
1979-03-0613.921200ModerateF2
1980-03-2211.3413900MinorF2
1983-04-2611.2313600MinorF2
1983-05-0311.1513400MinorF2
1986-03-1613.1819000ModerateF2
1987-04-0511.4714300MinorF2
1993-03-3113.4919900ModerateF2
1993-04-1111.4714300MinorF2
1996-01-1914.2417100ModerateC5 F1 F2 F3
1996-11-1011.6814800MinorF2
1998-01-1013.620300ModerateF2
1999-01-2511.414100MinorF2
2000-02-2812.7317700MinorF2
2001-04-1011.5714800MinorF2
2003-03-2211.4714300MinorF2
2005-04-0313.6820500ModerateF2
2006-06-2917.7235100MajorF2
2008-03-0911.6114700MinorF2
2010-03-2411.2913900MinorF2
2010-10-0211.0713300minorF2
2011-04-2911.3414000MinorF2
2011-09-0816.3429700MajorF2



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: 08:00 PM May 28, 2014