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Pomperaug River above Southbury

Highest listed crest 21.80 ftFlood stage 9.0 ft12 crests since 1955

The Pomperaug River above Southbury crested at major flood stage 7 times among the 12 crests the National Weather Service lists from 1955 to 2011. The highest, 21.80 ft on August 19, 1955, was major flooding, 12.80 feet above flood stage.

The gauge

Highest listed crest
21.80 ft
August 19, 1955; 29,400 cubic feet per second
Flood stage
9.0 ft
Major flooding from 12.0 ft
Crests at major
7
4th of 26 gauges in Connecticut
Most recent flood crest
March 7, 2011
17.66 ft, major flooding
Location
New Haven County
Near Naugatuck (9.0 mi), Waterbury (11.1 mi), Ansonia (12.4 mi)

Flood stages

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

Flood categories, Pomperaug River above Southbury
Action stage8.50—The level at which the NWS or its partners begin to take action
Flood stage (minor)9.00—Minimal or no property damage, but possibly some public threat
Moderate flood stage10.05Jan 27, 1996Some inundation of structures and roads near the stream
Major flood stage12.07Mar 7, 2011Extensive inundation of structures and roads

Every listed crest

12 crests from 1955 to 2011. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Pomperaug River above Southbury, 1955 to 2011 510152025ft Flood stage 9.0 ftMajor 12.0 ft Aug 19, 1955: 21.80 ft, major flooding; 29,400 cubic feet per secondMar 22, 1980: 10.92 ft, moderate flooding; 4,780 cubic feet per secondJun 5, 1982: 14.18 ft, major flooding; 7,880 cubic feet per secondMar 19, 1983: 10.68 ft, moderate flooding; 4,560 cubic feet per secondMay 30, 1984: 10.48 ft, moderate flooding; 4,510 cubic feet per secondApr 4, 1987: 15.92 ft, major flooding; 9,780 cubic feet per secondOct 20, 1989: 12.71 ft, major flooding; 6,410 cubic feet per secondAug 22, 1994: 10.94 ft, moderate flooding; 4,760 cubic feet per secondJan 27, 1996: 11.63 ft, moderate flooding; 5,320 cubic feet per secondApr 23, 2006: 12.82 ft, major flooding; 6,330 cubic feet per secondApr 16, 2007: 13.85 ft, major flooding; 7,350 cubic feet per secondMar 7, 2011: 17.66 ft, major flooding; 12,500 cubic feet per second Highest, 21.80 ft, Aug 19, 1955 196019701980199020002010

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Pomperaug River above Southbury 1950s: 1 1960s: 0 1970s: 0 1980s: 6 6 1990s: 2 2000s: 2 2010s: 1 1950s1960s1970s1980s1990s2000s2010s
  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, Pomperaug River above Southbury
1Aug 19, 195521.80+12.80Major29,400
2Mar 7, 201117.66+8.66Major12,500
3Apr 4, 198715.92+6.92Major9,780
4Jun 5, 198214.18+5.18Major7,880
5Apr 16, 200713.85+4.85Major7,350
6Apr 23, 200612.82+3.82Major6,330
7Oct 20, 198912.71+3.71Major6,410
8Jan 27, 199611.63+2.63Moderate5,320
9Aug 22, 199410.94+1.94Moderate4,760
10Mar 22, 198010.92+1.92Moderate4,780
11Mar 19, 198310.68+1.68Moderate4,560
12May 30, 198410.48+1.48Moderate4,510

Other gauges in New Haven County

Flood gauges in New Haven County
Stevenson11.024.50 ft, Aug 19, 19559
New Haven (IN MLLW)8.710.58 ft, Sep 21, 19380
Beacon Falls12.014.36 ft, Aug 28, 20111

New Haven County: every hazard · River floods across the country · Connecticut

NOAA National Water Prediction Service, gauge SBYC3, 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.