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Millstone River at Millstone

Highest listed crest 22.45 ftFlood stage 10.0 ft16 crests since 1999

The Millstone River at Millstone crested at major flood stage 6 times among the 16 crests the National Weather Service lists from 1999 to 2024. The highest, 22.45 ft on September 2, 2021, was major flooding, 12.45 feet above flood stage. 3 other gauges on the Millstone River crested above flood stage within a week of it, 1 at its own highest listed crest.

The gauge

Highest listed crest
22.45 ft
September 2, 2021; 37,320 cubic feet per second
Flood stage
10.0 ft
Major flooding from 16.0 ft
Crests at major
6
19th of 125 gauges in New Jersey
Most recent flood crest
January 10, 2024
14.65 ft, moderate flooding
Location
Somerset County
Near Manville (2.7 mi), Somerville (4.7 mi), Bound Brook (5.2 mi)

Flood stages

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

Flood categories, Millstone River at Millstone
Action stage8.00—The level at which the NWS or its partners begin to take action
Flood stage (minor)10.02Dec 26, 2020Minimal or no property damage, but possibly some public threat
Moderate flood stage11.08Jan 10, 2024Some inundation of structures and roads near the stream
Major flood stage16.06Sep 2, 2021Extensive inundation of structures and roads

Every listed crest

16 crests from 1999 to 2024. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Millstone River at Millstone, 1999 to 2024 10152025ft Flood stage 10.0 ftMajor 16.0 ft Sep 17, 1999: 22.30 ft, major floodingOct 12, 2005: 13.90 ft, moderate floodingApr 16, 2007: 20.10 ft, major floodingMar 14, 2010: 17.40 ft, major floodingAug 28, 2011: 22.30 ft, major floodingMay 1, 2014: 16.88 ft, major flooding; 27,279 cubic feet per secondMay 28, 2018: 12.71 ft, moderate flooding; 19,100 cubic feet per secondNov 26, 2018: 12.80 ft, moderate flooding; 19,280 cubic feet per secondDec 1, 2020: 10.30 ft, minor flooding; 14,280 cubic feet per secondDec 26, 2020: 10.42 ft, minor flooding; 14,520 cubic feet per secondAug 23, 2021: 14.70 ft, moderate flooding; 23,080 cubic feet per secondSep 2, 2021: 22.45 ft, major flooding; 37,320 cubic feet per secondApr 8, 2022: 12.01 ft, moderate flooding; 17,700 cubic feet per secondDec 19, 2023: 15.37 ft, moderate flooding; 24,420 cubic feet per secondDec 29, 2023: 11.18 ft, moderate flooding; 16,040 cubic feet per secondJan 10, 2024: 14.65 ft, moderate flooding; 22,980 cubic feet per second Highest, 22.45 ft, Sep 2, 2021 200020052010201520202025

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Millstone River at Millstone 1990s: 1 2000s: 2 2010s: 5 2020s: 8 8 1990s2000s2010s2020s
  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, Millstone River at Millstone
1Sep 2, 202122.45+12.45Major37,320
2Sep 17, 199922.30+12.30Major—
3Aug 28, 201122.30+12.30Major—
4Apr 16, 200720.10+10.10Major—
5Mar 14, 201017.40+7.40Major—
6May 1, 201416.88+6.88Major27,279
7Dec 19, 202315.37+5.37Moderate24,420
8Aug 23, 202114.70+4.70Moderate23,080
9Jan 10, 202414.65+4.65Moderate22,980
10Oct 12, 200513.90+3.90Moderate—
11Nov 26, 201812.80+2.80Moderate19,280
12May 28, 201812.71+2.71Moderate19,100
13Apr 8, 202212.01+2.01Moderate17,700
14Dec 29, 202311.18+1.18Moderate16,040
15Dec 26, 202010.42+0.42Minor14,520
16Dec 1, 202010.30+0.30Minor14,280

The worst floods along the Millstone River

For this gauge's highest crests, the other gauges on the Millstone River that crested above flood stage within a week.

September 2, 2021: 22.45 ft here, major flooding

  • WestonNJ · Sep 2, 2021 · 23.75 ft · Major · its highest
  • GriggstownNJ · Sep 2, 2021 · 23.36 ft · Major
  • Blackwells MillsNJ · Sep 2, 2021 · 20.81 ft · Major

September 17, 1999: 22.30 ft here, major flooding

August 28, 2011: 22.30 ft here, major flooding

  • GriggstownNJ · Aug 28, 2011 · 24.21 ft · Major · its highest
  • WestonNJ · Aug 28, 2011 · 22.90 ft · Major
  • Blackwells MillsNJ · Aug 28, 2011 · 21.24 ft · Major · its highest

Gauges on the Millstone River

In USGS station-number order, which runs downstream within a river basin.

Flood gauges on the Millstone River
GriggstownNJ10.024.21 ft, Aug 28, 201114
Blackwells MillsNJ9.021.24 ft, Aug 28, 201111
Millstone this gaugeNJ10.022.45 ft, Sep 2, 20216
WestonNJ11.523.75 ft, Sep 2, 20217

Other gauges in Somerset County

Flood gauges in Somerset County
Seeley Mills5.59.05 ft, Sep 2, 20210
Burnt Mills11.016.79 ft, Sep 2, 20214
Bound Brook11.020.66 ft, Sep 2, 20210
Burnt Mills9.512.76 ft, Sep 2, 20211
Blackwells Mills9.021.24 ft, Aug 28, 201111
Griggstown10.024.21 ft, Aug 28, 201114
Weston11.523.75 ft, Sep 2, 20217
North Branch Village12.321.53 ft, Sep 16, 19990
South Branch8.020.26 ft, Sep 2, 202114
Far Hills6.07.60 ft, Jul 23, 19190
Raritan10.019.52 ft, Sep 2, 20216
Millington8.010.26 ft, Aug 29, 20112
Bound Brook28.042.13 ft, Sep 17, 199913
Manville14.027.66 ft, Sep 2, 202110
North Plainfield7.010.65 ft, Aug 2, 19730
Watchung14.024.50 ft, Aug 2, 19730
Martinsville6.011.47 ft, Sep 2, 20210

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

NOAA National Water Prediction Service, gauge MITN4, 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.