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Raritan Bay at Keansburg (IN MLLW)

Highest listed crest 16.73 ftFlood stage 7.0 ft36 crests since 1950

The Raritan Bay at Keansburg (IN MLLW) crested at major flood stage 6 times among the 36 crests the National Weather Service lists from 1950 to 2026. The highest, 16.73 ft on October 29, 2012, was major flooding, 9.73 feet above flood stage.

The gauge

Highest listed crest
16.73 ft
October 29, 2012
Flood stage
7.0 ft
Major flooding from 9.0 ft
Crests at major
6
19th of 125 gauges in New Jersey
Most recent flood crest
September 27, 2026
9.12 ft, major flooding
Location
Monmouth County
Near South Amboy (7.4 mi), Red Bank (8.1 mi), Perth Amboy (8.1 mi)

Flood stages

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

Flood categories, Raritan Bay at Keansburg (IN MLLW)
Flood stage (minor)7.00—Minimal or no property damage, but possibly some public threat
Moderate flood stage8.030Oct 13, 2025Some inundation of structures and roads near the stream
Major flood stage9.06Sep 27, 2026Extensive inundation of structures and roads

Every listed crest

36 crests from 1950 to 2026. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Raritan Bay at Keansburg (IN MLLW), 1950 to 2026 681012141618ft Flood stage 7.0 ftMajor 9.0 ft Nov 25, 1950: 10.83 ft, major floodingDec 25, 2002: 8.39 ft, moderate floodingJan 3, 2003: 8.14 ft, moderate floodingJan 31, 2006: 8.26 ft, moderate floodingOct 7, 2006: 8.03 ft, moderate floodingApr 16, 2007: 8.33 ft, moderate floodingMay 12, 2008: 8.16 ft, moderate floodingOct 18, 2009: 8.40 ft, moderate floodingNov 13, 2009: 8.14 ft, moderate floodingMar 13, 2010: 9.94 ft, major floodingMar 30, 2010: 8.04 ft, moderate floodingApr 16, 2011: 8.37 ft, moderate floodingAug 28, 2011: 10.09 ft, major floodingJun 4, 2012: 8.19 ft, moderate floodingOct 29, 2012: 16.73 ft, major floodingApr 29, 2014: 8.12 ft, moderate floodingJan 10, 2016: 8.38 ft, moderate floodingJan 23, 2016: 8.31 ft, moderate floodingFeb 8, 2016: 8.69 ft, moderate floodingJan 24, 2017: 8.08 ft, moderate floodingMar 14, 2017: 8.29 ft, moderate floodingMay 25, 2017: 8.10 ft, moderate floodingMar 3, 2018: 8.53 ft, moderate floodingSep 9, 2018: 8.33 ft, moderate floodingOct 27, 2018: 9.19 ft, major floodingNov 16, 2018: 8.30 ft, moderate floodingNov 25, 2018: 8.34 ft, moderate floodingJan 20, 2019: 8.11 ft, moderate floodingDec 17, 2020: 8.19 ft, moderate floodingFeb 1, 2021: 8.24 ft, moderate floodingMay 28, 2021: 8.24 ft, moderate floodingDec 23, 2022: 8.99 ft, moderate floodingJan 13, 2024: 8.67 ft, moderate floodingMar 9, 2024: 8.15 ft, moderate floodingOct 13, 2025: 8.00 ft, moderate floodingSep 27, 2026: 9.12 ft, major flooding Highest, 16.73 ft, Oct 29, 2012 19501960197019801990200020102020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Raritan Bay at Keansburg (IN MLLW) 1950s: 1 1960s: 0 1970s: 0 1980s: 0 1990s: 0 2000s: 8 2010s: 19 19 2020s: 8 1950s1960s1970s1980s1990s2000s2010s2020s
  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, Raritan Bay at Keansburg (IN MLLW)
1Oct 29, 201216.73+9.73Major—
2Nov 25, 195010.83+3.83Major—
3Aug 28, 201110.09+3.09Major—
4Mar 13, 20109.94+2.94Major—
5Oct 27, 20189.19+2.19Major—
6Sep 27, 20269.12+2.12Major—
7Dec 23, 20228.99+1.99Moderate—
8Feb 8, 20168.69+1.69Moderate—
9Jan 13, 20248.67+1.67Moderate—
10Mar 3, 20188.53+1.53Moderate—
11Oct 18, 20098.40+1.40Moderate—
12Dec 25, 20028.39+1.39Moderate—
13Jan 10, 20168.38+1.38Moderate—
14Apr 16, 20118.37+1.37Moderate—
15Nov 25, 20188.34+1.34Moderate—
16Apr 16, 20078.33+1.33Moderate—
17Sep 9, 20188.33+1.33Moderate—
18Jan 23, 20168.31+1.31Moderate—
19Nov 16, 20188.30+1.30Moderate—
20Mar 14, 20178.29+1.29Moderate—
21Jan 31, 20068.26+1.26Moderate—
22Feb 1, 20218.24+1.24Moderate—
23May 28, 20218.24+1.24Moderate—
24Jun 4, 20128.19+1.19Moderate—
25Dec 17, 20208.19+1.19Moderate—
26May 12, 20088.16+1.16Moderate—
27Mar 9, 20248.15+1.15Moderate—
28Jan 3, 20038.14+1.14Moderate—
29Nov 13, 20098.14+1.14Moderate—
30Apr 29, 20148.12+1.12Moderate—
31Jan 20, 20198.11+1.11Moderate—
32May 25, 20178.10+1.10Moderate—
33Jan 24, 20178.08+1.08Moderate—
34Mar 30, 20108.04+1.04Moderate—
35Oct 7, 20068.03+1.03Moderate—
36Oct 13, 20258.00+1.00Moderate—

Other gauges in Monmouth County

Flood gauges in Monmouth County
Allenwood14.520.38 ft, Aug 28, 20111
Squankum8.513.06 ft, Aug 28, 20112
New Jersey Atlantic Coast at Sandy Hook (IN MLLW)6.714.40 ft, Oct 29, 201214
Belmar (IN MLLW)5.913.22 ft, Oct 29, 20125
Neptune City7.07.94 ft, Dec 26, 19690
Sea Bright (IN MLLW)5.211.73 ft, Oct 29, 201210
Red Bank7.07.73 ft, May 1, 20140
Manasquan (IN MLLW)5.712.28 ft, Oct 29, 20124

Monmouth County: every hazard · River floods across the country · New Jersey

NOAA National Water Prediction Service, gauge KSBN4, 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.