Millstone River at Griggstown NJ water level

Name: Millstone River at Griggstown NJ water level (U.S. Geological Survey)
Creator: U.S. Geological Survey
License: https://www.usgs.gov/information-policies-and-instructions/copyrights-and-credits

River gauge, Millstone River, New Jersey, United States

Directions

Below flood stage

Water level

4.10ft Down 0.13 ft over the last 24 hours

Measured Oct 18, 2026, 11:00 AM EDT (37 min ago)

History

7 days

Water level Minor flood stage

What this means

Water levels are unremarkable at Millstone River at Griggstown NJ, where the gauge shows 4.10 ft.

It is 5.90 ft below the flood stage of 10.00 ft.

It is still going down, by 0.13 ft over the past 24 hours. The 30-day range is 3.97 ft – 4.42 ft.

Fall is often low-water season on rivers, until steadier rain returns.

Judged against the official flood stage for this gauge. How to read levels

Key numbers

Highest on record: 24.21 ftAugust 28, 2011

Paddling and fishing conditions

Most paddlers and anglers will find the river in good shape at this stage.

For reference, flood stage is 10.00 ft.

What happens at each level

15.00 ft: River Road flooding expands. The road closes between Grist Mill Drive and the Millstone Causway. Canal Road in Franklin Township floods.
12.00 ft: River Road flooding expands near the Griggstown Causeway and begins south of Dead Tree Run Road.
10.00 ft: River Road in Montgomery Township begins to flood near the Griggstown Causeway.
9.50 ft: Griggstown Causeway is closed.
4.10 ft: Right now

Impact statements from the U.S. National Weather Service.

Highest crests on record

Rank	Level	Date
1	24.21 ft	August 28, 2011
2	23.36 ft	September 2, 2021
3	23.20 ft	September 16, 1999
4	22.70 ft	August 28, 1971
5	22.16 ft	April 16, 2007
6	19.00 ft	September 22, 1938
7	18.65 ft	March 14, 2010
8	18.56 ft	May 1, 2014
9	18.00 ft	October 19, 1996
10	17.24 ft	August 23, 2021

Weather at the gauge

The forecast is not available right now.

Sunrise 07:13 AM Sunset 06:15 PM Daylight 11 hr, 2 min First quarter 50%

Map

Other gauges on the Millstone River

Gauge	Level	Compared with normal	24 hours	Distance
Millstone River at Blackwells Mills NJRiver gauge, Millstone River	2.10 ft	Below flood stage	−0.06 ft	3.3 mi
Millstone River at Millstone NJRiver gauge, Millstone River	1.42 ft	Below flood stage	−0.11 ft	4.6 mi
Millstone River at Weston NJRiver gauge, Millstone River	2.09 ft	Below flood stage	−0.06 ft	6 mi

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Pike Run at Belle Mead NJRiver gauge, Pike Run	2.1 cfs	Normal	−0.4 cfs	2.5 mi
Royce Brook at Hamilton Road near Manville NJRiver gauge, Royce Brook	7.8 cfs	Normal	−1.7 cfs	4.6 mi
Stony Brook at Princeton NJRiver gauge, Stony Brook	1.82 ft	Below flood stage	−0.10 ft	8 mi
Raritan River at Manville NJRiver gauge, Raritan River	4.40 ft	Below flood stage	−0.11 ft	8 mi
Raritan River below Calco Dam at Bound Brook NJRiver gauge, Raritan River	17.53 ft	Below flood stage	−0.13 ft	8 mi
North Branch Raritan River at South Branch NJRiver gauge, North Branch Raritan River	1.66 ft	Below flood stage	−0.14 ft	9 mi
Middle Brook at Bound Brook NJRiver gauge, Middle Brook	4.14 ft	Below flood stage	−0.01 ft	9 mi

Questions and answers

What is flood stage for the Millstone River at Griggstown NJ?

The official flood stage is 10.00 ft. The level is currently 5.90 ft below it.

Is gage height the same as water depth?

No. Gage height is measured from a fixed reference point chosen by the agency, so a reading of 10 ft does not mean the river is 10 ft deep.

What is the water level of Millstone River at Griggstown NJ today?

On Oct 18, 2026, 11:00 AM EDT, the water level was 4.10 ft. Down 0.13 ft over the last 24 hours.

Is Millstone River at Griggstown NJ rising or falling?

Down 0.13 ft over the last 24 hours.

Is the level of Millstone River at Griggstown NJ normal?

Below flood stage. Judged against the official flood stage for this gauge.

What is the highest water level ever recorded at Millstone River at Griggstown NJ?

The highest level on record is 24.21 ft on August 28, 2011.

How often is this data updated?

The U.S. Geological Survey publishes a new reading every 15 minutes. This page refreshes within minutes of each update.

For specialists

Station codes, datum, parameters, data quality and downloads

Operator: U.S. Geological Survey
Station code: usgs:01401750 (Agency page)
Coordinates: 40.44000, -74.61750 (WGS84)
Vertical datum: NGVD29
Update interval: every 15 minutes
Licence: Public domain. Data: U.S. Geological Survey (USGS), provisional data subject to revision

Published series

Parameter	Last value	Time (UTC)	Quality
Water level	4.10 ft	2026-10-18 15:00	Provisional

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How to cite

U.S. Geological Survey: Millstone River at Griggstown NJ (usgs:01401750). Accessed October 18, 2026 via Nivelmap, https://nivelmap.com/en/united-states/new-jersey/millstone-river-at-griggstown-nj

How we check values

Each reading is stored as published. We hold back values that jump faster than physically plausible and show the measurement time with every value.

Readings are provisional, can be delayed or wrong and are not a flood warning. Read the disclaimer