RIVER GAUGE · MILLSTONE RIVER
Millstone River at Griggstown
Somerset County, New Jersey
Water level3.85 ft
Flow—
Last readingSep 16, 2026, 4:45 PM UTC (last recorded)
Action9.5 ft
Minor flood10 ft
Moderate flood12 ft
Major flood15 ft
The past week
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What floods at each level
- 15 ft
River Road flooding expands. The road closes between Grist Mill Drive and the Millstone Causway. Canal Road in Franklin Township floods.
- 12 ft
River Road flooding expands near the Griggstown Causeway and begins south of Dead Tree Run Road.
- 10 ft
River Road in Montgomery Township begins to flood near the Griggstown Causeway.
- 9.5 ft
Griggstown Causeway is closed.
Highest crests on record
| Date | Level | Flow |
|---|---|---|
| Aug 28, 2011 | 24.21 ft | — |
| Sep 2, 2021 | 23.36 ft | — |
| Sep 15, 1999 | 23.2 ft | — |
More on Millstone River
DownstreamMillstone River at Blackwells Mills
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