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Somerset County Public Safety
Tuesday January 9th, 2024 :: 11:00 p.m. EST


Flood Warning until 01:00AM Friday

* WHAT...Moderate flooding is forecast.

* WHERE...Millstone River at Blackwells Mills.

* WHEN...Until early Friday morning.

* IMPACTS...At 6.0 feet, The Griggstown Causeway is closed due to flooding. At 7.0 feet, Several more causeways are closed due to flooding. At 9.0 feet, 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. At 10.0 feet, The D&R Canal is flooded by the Millstone River. At 13.0 feet, Washington Street and several businesses are flooded.

* ADDITIONAL DETAILS... - At 10:15 PM EST Tuesday the stage was 6.4 feet. - Forecast...The river is expected to rise above flood stage just after midnight tonight to a crest of 13.2 feet tomorrow evening. It will then fall below flood stage Thursday evening. - Flood stage is 9.0 feet. - Flood History...This crest compares to a previous crest of 13.2 feet on 12/21/1973. -


Somerset County Public Safety
20 Grove St
Somerville, NJ 08876

Emergency: 9-1-1
Non-emergencies: 908-231-7140

Alert Details

Severe - Significant threat to life or property
Immediate - Responsive action SHOULD be taken immediately
Observed - Determined to have occurred or to be ongoing
Meteorological (inc. flood)
Flood Warning

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