Millstone River at Blackwells Mills NJ water level

Name: Millstone River at Blackwells Mills 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

2.03ft Down 0.05 ft over the last 24 hours

Measured Oct 19, 2026, 04:15 PM EDT (1 hour ago)

Flow: 213 cfs
Water temperature: 57 °F

History

7 days

Water level Forecast Minor flood stage

The forecast expects the river to fall to 1.90 ft by Thursday, October 22 at 08:00 AM. Issued Monday, October 19 at 10:26 AM by NOAA National Weather Service.

What this means

The Millstone River at Blackwells Mills NJ is at 2.03 ft, in the normal range.

It is 6.97 ft below the flood stage of 9.00 ft.

It has dropped 0.05 ft over the past 24 hours. The forecast expects the river to fall to 1.90 ft by Thursday, October 22 at 08:00 AM. In the last month it has stayed between 2.03 ft and 2.23 ft.

The water temperature at the gauge is 57 °F.

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

Key numbers

Highest on record: 21.24 ftAugust 28, 2011
Forecast peak: 2.00 ftMonday, October 19 at 02:00 PM

Floating and fishing near Millstone River at Blackwells Mills NJ

Normal flows mean predictable rapids and good access at most put-ins.

Flood stage here is 9.00 ft, 6.97 ft above the current reading. Beyond it, the National Weather Service also defines moderate and major flood stages.

What happens at each level

13.00 ft: Washington Street and several businesses are flooded.
10.00 ft: The D&R Canal is flooded by the Millstone River.
9.00 ft: Flood stage reached with flooding now along River Road in Blackwells Mills and S. River Street in Millstone. Base of Route 533 bridge floods. River Road between Yorktown and Amsterdam is subject to closure. Canal Road near Suydam Road floods.
7.00 ft: Several more causeways are closed due to flooding.
6.00 ft: The Griggstown Causeway is closed due to flooding.
2.03 ft: Right now

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

Highest crests on record

Chance of at least minor flooding in October to December: 70 %.

Rank	Level	Date
1	21.24 ft	August 28, 2011
2	21.01 ft	September 17, 1999
3	20.81 ft	September 2, 2021
4	19.24 ft	April 16, 2007
5	18.68 ft	August 28, 1971
6	16.84 ft	July 15, 1975
7	16.15 ft	March 14, 2010
8	15.87 ft	May 1, 2014
9	15.53 ft	October 20, 1996
10	15.29 ft	September 21, 1938

Weather at the gauge

Rain in the last 3 days: 0.07 in. Rain that falls upstream can take hours or days to show up at a river gauge.

19 Mon 62° 36° – Wind 8 mph

20 Tue 66° 43° – Wind 14 mph

21 Wed 62° 49° – Wind 12 mph

22 Thu 67° 48° – Wind 9 mph

23 Fri 60° 51° – Wind 11 mph

24 Sat 59° 46° – Wind 6 mph

25 Sun 61° 43° – Wind 6 mph

Forecast: Open-Meteo

Sunrise 07:14 AM Sunset 06:14 PM Daylight 11 hr First quarter 62%

Map

Other gauges on the Millstone River

Gauge	Level	Compared with normal	24 hours	Distance
Millstone River at Griggstown NJRiver gauge, Millstone River	3.79 ft	Below flood stage	−0.14 ft	3.3 mi
Millstone River at Millstone NJRiver gauge, Millstone River	1.25 ft	Below flood stage	−0.14 ft	2.0 mi
Millstone River at Weston NJRiver gauge, Millstone River	1.91 ft	Below flood stage	−0.09 ft	3.8 mi

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Royce Brook at Hamilton Road near Manville NJRiver gauge, Royce Brook	7.0 cfs	Very high	−0.4 cfs	3.3 mi
Pike Run at Belle Mead NJRiver gauge, Pike Run	1.9 cfs	Normal	−0.2 cfs	3.9 mi
Raritan River below Calco Dam at Bound Brook NJRiver gauge, Raritan River	17.34 ft	Below flood stage	−0.14 ft	5.5 mi
Raritan River at Manville NJRiver gauge, Raritan River	4.26 ft	Below flood stage	−0.10 ft	5.6 mi
Middle Brook at Bound Brook NJRiver gauge, Middle Brook	4.08 ft	Below flood stage	−0.02 ft	6.1 mi
North Branch Raritan River at South Branch NJRiver gauge, North Branch Raritan River	1.58 ft	Below flood stage	−0.06 ft	8 mi
Bound Brook at Middlesex NJRiver gauge, Bound Brook	1.71 ft	Below flood stage	+0.01 ft	8 mi

Questions and answers

What is flood stage for the Millstone River at Blackwells Mills NJ?

The official flood stage is 9.00 ft. The level is currently 6.97 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 Blackwells Mills NJ today?

On Oct 19, 2026, 04:15 PM EDT, the water level was 2.03 ft. Down 0.05 ft over the last 24 hours.

Is Millstone River at Blackwells Mills NJ rising or falling?

Down 0.05 ft over the last 24 hours.

Is the level of Millstone River at Blackwells Mills 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 Blackwells Mills NJ?

The highest level on record is 21.24 ft on August 28, 2011.

Is Millstone River at Blackwells Mills NJ expected to rise?

The forecast expects the river to fall to 1.90 ft by Thursday, October 22 at 08:00 AM.

For specialists

Station codes, datum, parameters, data quality and downloads

Operator: U.S. Geological Survey
Station code: usgs:01402000 (Agency page)
Coordinates: 40.47500, -74.57583 (WGS84)
Vertical datum: NAVD88
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	2.03 ft	2026-10-19 20:15	Provisional
Flow	213 cfs	2026-10-19 20:15	Provisional
Water temperature	57 °F	2026-10-19 20:15	Provisional

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How to cite

U.S. Geological Survey: Millstone River at Blackwells Mills NJ (usgs:01402000). Accessed October 19, 2026 via Nivelmap, https://nivelmap.com/en/united-states/new-jersey/millstone-river-at-blackwells-mills-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