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Manalapan Brook at Spotswood

Highest listed crest 22.22 ftFlood stage 19.0 ft14 crests since 1968

The Manalapan Brook at Spotswood crested at major flood stage 1 time among the 14 crests the National Weather Service lists from 1968 to 2023. The highest, 22.22 ft on August 28, 2011, was major flooding, 3.22 feet above flood stage.

The gauge

Highest listed crest
22.22 ft
August 28, 2011
Flood stage
19.0 ft
Major flooding from 22.0 ft
Crests at major
1
68th of 125 gauges in New Jersey
Most recent flood crest
December 19, 2023
19.29 ft, minor flooding
Location
Middlesex County
Near South River (3.9 mi), Sayreville (6.5 mi), New Brunswick (7.3 mi)

Flood stages

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

Flood categories, Manalapan Brook at Spotswood
Action stage18.50—The level at which the NWS or its partners begin to take action
Flood stage (minor)19.012Dec 19, 2023Minimal or no property damage, but possibly some public threat
Moderate flood stage21.00—Some inundation of structures and roads near the stream
Major flood stage22.01Aug 28, 2011Extensive inundation of structures and roads

Every listed crest

14 crests from 1968 to 2023. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Manalapan Brook at Spotswood, 1968 to 2023 141618202224ft Flood stage 19.0 ftMajor 22.0 ft May 30, 1968: 19.90 ft, minor flooding; 1,650 cubic feet per secondAug 28, 1971: 19.80 ft, minor floodingMay 31, 1984: 19.62 ft, minor flooding; 1,270 cubic feet per secondSep 20, 1989: 19.97 ft, minor flooding; 1,700 cubic feet per secondJul 18, 2005: 20.42 ft, minor flooding; 2,550 cubic feet per secondApr 16, 2007: 20.08 ft, minor flooding; 1,920 cubic feet per secondMar 14, 2010: 19.87 ft, minor floodingAug 28, 2011: 22.22 ft, major floodingMar 31, 2014: 19.07 ft, minor flooding; 674 cubic feet per secondMay 1, 2014: 20.31 ft, minor flooding; 2,316 cubic feet per secondMay 28, 2018: 19.46 ft, minor flooding; 1,147 cubic feet per secondNov 26, 2018: 19.35 ft, minor flooding; 1,014 cubic feet per secondSep 3, 2021: 15.53 ft, below flood stage; 929 cubic feet per secondDec 19, 2023: 19.29 ft, minor flooding; 941 cubic feet per second Highest, 22.22 ft, Aug 28, 2011 197019801990200020102020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Manalapan Brook at Spotswood 1960s: 1 1970s: 1 1980s: 2 1990s: 0 2000s: 2 2010s: 6 6 2020s: 1 1960s1970s1980s1990s2000s2010s2020s
  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, Manalapan Brook at Spotswood
1Aug 28, 201122.22+3.22Major—
2Jul 18, 200520.42+1.42Minor2,550
3May 1, 201420.31+1.31Minor2,316
4Apr 16, 200720.08+1.08Minor1,920
5Sep 20, 198919.97+0.97Minor1,700
6May 30, 196819.90+0.90Minor1,650
7Mar 14, 201019.87+0.87Minor—
8Aug 28, 197119.80+0.80Minor—
9May 31, 198419.62+0.62Minor1,270
10May 28, 201819.46+0.46Minor1,147
11Nov 26, 201819.35+0.35Minor1,014
12Dec 19, 202319.29+0.29Minor941
13Mar 31, 201419.07+0.07Minor674
14Sep 3, 202115.53−3.47Below flood stage929

Other gauges in Middlesex County

Flood gauges in Middlesex County
Perth Amboy (IN MLLW)7.29.39 ft, Oct 27, 20182
Middlesex9.014.11 ft, Sep 2, 20210
Weston Mills18.020.30 ft, Aug 28, 20110

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

NOAA National Water Prediction Service, gauge SPTN4, 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.