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Mongaup River at Mongaup Valley

Highest listed crest 15.22 ftFlood stage 14.0 ft7 crests since 1955

The Mongaup River at Mongaup Valley crested at major flood stage 1 time among the 7 crests the National Weather Service lists from 1955 to 2005. The highest, 15.22 ft on August 19, 1955, was major flooding, 1.22 feet above flood stage.

The gauge

Highest listed crest
15.22 ft
August 19, 1955; 16,100 cubic feet per second
Flood stage
14.0 ft
Major flooding from 15.0 ft
Crests at major
1
98th of 160 gauges in New York
Most recent flood crest
August 19, 1955
15.22 ft, major flooding
Location
Sullivan County
New York

Flood stages

The thresholds the National Weather Service uses for this gauge today, and how many listed crests reached each.

Flood categories, Mongaup River at Mongaup Valley
Action stage12.02Apr 3, 2005The level at which the NWS or its partners begin to take action
Flood stage (minor)14.00—Minimal or no property damage, but possibly some public threat
Moderate flood stage14.70—Some inundation of structures and roads near the stream
Major flood stage15.01Aug 19, 1955Extensive inundation of structures and roads

Every listed crest

7 crests from 1955 to 2005. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Mongaup River at Mongaup Valley, 1955 to 2005 46810121416ft Flood stage 14.0 ftMajor 15.0 ft Aug 19, 1955: 15.22 ft, major flooding; 16,100 cubic feet per secondApr 4, 1994: 6.25 ft, below flood stage; 2,780 cubic feet per secondMar 9, 1995: 4.38 ft, below flood stage; 1,010 cubic feet per secondSep 23, 2003: 6.73 ft, below flood stage; 1,680 cubic feet per secondSep 18, 2004: 11.94 ft, below flood stage; 5,720 cubic feet per secondMar 29, 2005: 12.80 ft, action stageApr 3, 2005: 13.47 ft, action stage; 7,630 cubic feet per second Highest, 15.22 ft, Aug 19, 1955 19601970198019902000

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Mongaup River at Mongaup Valley 1950s: 1 1 1960s: 0 1970s: 0 1980s: 0 1990s: 0 2000s: 0 1950s1960s1970s1980s1990s2000s
  1. These are the crests the local National Weather Service office lists for the gauge: the highest on record and recent crests. Lesser floods between them may be missing, so counts by decade are a floor.
  2. Categories use today's flood stages. Levees, dams and channel changes since a crest can make old and new stages not directly comparable.

Highest crests

Highest listed crests, Mongaup River at Mongaup Valley
1Aug 19, 195515.22+1.22Major16,100
2Apr 3, 200513.47−0.53Action7,630
3Mar 29, 200512.80−1.20Action—
4Sep 18, 200411.94−2.06Below flood stage5,720
5Sep 23, 20036.73−7.27Below flood stage1,680
6Apr 4, 19946.25−7.75Below flood stage2,780
7Mar 9, 19954.38−9.62Below flood stage1,010

Other gauges in Sullivan County

Flood gauges in Sullivan County
Callicoon7.09.68 ft, Aug 17, 19472
Barryville17.028.97 ft, Jun 28, 20062
Bridgeville13.021.25 ft, Apr 3, 20051
Neversink Reservoir1,441.51,443.46 ft, Apr 3, 20052
Neversink Reservoir9.012.99 ft, Apr 3, 20052

Sullivan County: every hazard · River floods across the country · New York

NOAA National Water Prediction Service, gauge MGPN6, retrieved October 30, 2026. Stages in feet on the gauge's own datum, not elevation. Crests are as the National Weather Service lists them; preliminary values may be revised.