Rivers in New Jersey
Millstone River at Blackwells Mills
Below flood stage
2.18ftStage
Observed Wed, Sep 23, 3:15 AM EDT
- Flood stage
- 9.00 ft
- Forecast crest
- 1.90 ftWed, Sep 23, 8:00 AM EDT
- Record crest
- 21.24 ft2011
Flood stages and impacts
| Category | Stage |
|---|---|
| Major flood | 15.00 ft |
| Moderate flood | 10.00 ft |
| Minor flood | 9.00 ft |
| Action | 7.00 ft |
- 13.00 ftWashington Street and several businesses are flooded.
- 10.00 ftThe D&R Canal is flooded by the Millstone River.
- 9.00 ftFlood 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 ftSeveral more causeways are closed due to flooding.
- 6.00 ftThe Griggstown Causeway is closed due to flooding.
Flood outlook
Chance of flooding, September to November
| Category | Chance |
|---|---|
| Minor flooding | 51% |
| Moderate flooding | 37% |
| Major flooding | 6% |
The three-month chances are the River Forecast Centers’ long-range flood outlook, issued August 28, 2026.
Crest history
51 crests on NOAA’s list since 1938.
| # | Date | Stage |
|---|---|---|
| 1 | August 28, 2011 | 21.24 ft |
| 2 | September 17, 1999 | 21.01 ft |
| 3 | September 2, 2021 | 20.81 ft |
| 4 | April 16, 2007 | 19.24 ft |
| 5 | August 28, 1971 | 18.68 ft |
| 6 | July 15, 1975 | 16.84 ft |
| 7 | March 14, 2010 | 16.15 ft |
| 8 | May 1, 2014 | 15.87 ft |
| 9 | October 20, 1996 | 15.53 ft |
| 10 | September 21, 1938 | 15.29 ft |
| 11 | January 20, 1996 | 15.09 ft |
| 12 | July 21, 1975 | 14.63 ft |
| 13 | September 21, 1989 | 14.42 ft |
| 14 | August 23, 2021 | 14.30 ft |
| 15 | December 19, 2023 | 14.22 ft |
| 16 | January 27, 1978 | 14.02 ft |
| 17 | January 29, 1994 | 13.88 ft |
| 18 | September 9, 2011 | 13.77 ft |
| 19 | September 25, 1975 | 13.47 ft |
| 20 | January 10, 2024 | 13.29 ft |
| 21 | December 21, 1973 | 13.21 ft |
| 22 | December 12, 1992 | 12.97 ft |
| 23 | May 30, 1984 | 12.87 ft |
| 24 | May 28, 2018 | 12.58 ft |
| 25 | March 11, 1994 | 12.58 ft |
Most recent crests
- January 10, 2024: 13.29 ft
- December 29, 2023: 10.03 ft
- December 19, 2023: 14.22 ft
- April 8, 2022: 10.84 ft
- September 2, 2021: 20.81 ft
- August 23, 2021: 14.30 ft
- December 26, 2020: 9.50 ft
- December 1, 2020: 9.44 ft
- November 28, 2018: 9.02 ft
- November 26, 2018: 12.02 ft
Nearby
Upstream, downstream and the gauges around this one.
What this means
Forecasts by the Middle Atlantic River Forecast Center. Forecasts are issued routinely year-round.
Sources
Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service. Streamflow and the daily record from the U.S. Geological Survey.