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

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Date of Flood Crest(ft) Streamflow(cfs) Category Code 1935-07-08 16 29000 Major C1 C8 1936-03-18 16.6 31300 Major C1 1938-09-22 13.76 21000 Moderate none 1939-02-21 11.9 15600 Minor none 1940-03-31 13.54 20300 Moderate none 1940-04-09 12.25 16500 Minor none 1942-03-18 12.09 16100 Minor none 1942-12-30 13.94 21500 Moderate none 1943-05-18 11.86 15500 Minor none 1944-03-18 11.48 14400 Minor none 1946-03-08 11.18 13700 Minor none 1946-05-28 11.08 13400 Minor none 1947-04-06 11.15 13600 Minor none 1948-03-17 11.21 13700 Minor none 1948-03-22 13.18 19200 Moderate none 1948-12-31 11.49 14500 Minor none 1950-03-29 11.46 14400 Minor F2 1955-10-17 11.09 11800 Minor F2 1956-03-09 11.06 12600 Minor F2 1956-04-06 12.38 16000 Minor F2 1956-04-17 11.32 13300 Minor F2 1958-04-08 11.71 14200 Minor F2 1959-01-22 13.42 17000 Moderate C5 F2 1959-11-29 11.79 14400 Minor F2 1960-04-01 11.97 14900 Minor F2 1960-04-04 14.25 21200 Moderate F2 1961-02-26 11.66 14100 Minor F2 1962-04-02 12.83 17200 Minor F2 1963-03-27 12.62 16600 Minor F2 1964-03-06 13.17 18200 Moderate F2 1977-03-14 14.64 23500 Major F2 1977-03-31 11.18 13600 Minor F2 1977-09-21 11.82 15200 Minor F2 1977-10-18 14.13 21900 Moderate F2 1979-03-06 13.9 21200 Moderate F2 1980-03-22 11.34 13900 Minor F2 1983-04-26 11.23 13600 Minor F2 1983-05-03 11.15 13400 Minor F2 1986-03-16 13.18 19000 Moderate F2 1987-04-05 11.47 14300 Minor F2 1993-03-31 13.49 19900 Moderate F2 1993-04-11 11.47 14300 Minor F2 1996-01-19 14.24 17100 Moderate C5 F1 F2 F3 1996-11-10 11.68 14800 Minor F2 1998-01-10 13.6 20300 Moderate F2 1999-01-25 11.4 14100 Minor F2 2000-02-28 12.73 17700 Minor F2 2001-04-10 11.57 14800 Minor F2 2003-03-22 11.47 14300 Minor F2 2005-04-03 13.68 20500 Moderate F2 2006-06-29 17.72 35100 Major F2 2008-03-09 11.61 14700 Minor F2 2010-03-24 11.29 13900 Minor F2 2010-10-02 11.07 13300 minor F2 2011-04-29 11.34 14000 Minor F2 2011-09-08 16.34 29700 Major F2

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: 01:02 PM Jun 12, 2013