Raritan River at Manville, NJ
River level and flood forecast · Somerset County
The river is 8.1 ft below flood stage (14 ft).
Forecast to fall to 4.5 ft by Thu, Oct 15, 2 PM.
Flow: 1,440 cubic feet per second (USGS).
River camera
Watch the time-lapse
Camera by the U.S. Geological Survey. Most take a picture every hour, some every few minutes; many stop at night.
The last 7 days and the forecast
NWS forecast issued Mon, Oct 12, 3:03 PM. Forecasts change as rain falls and as upstream water arrives.
Get flood alerts for this river
An email when the National Weather Service forecasts Raritan River at Manville to flood, when it floods, and when it's over.
Flood stages
| Major flood stage | 20 ft |
| Moderate flood stage | 17 ft |
| Flood stage | 14 ft |
| Action stage | 12 ft |
| Record crest (September 2, 2021) | 27.66 ft |
What floods at each level
From the National Weather Service, highest first.
- 20 ftFlooding becomes widespread across Manville. Flooding expands between Dukes Parkway and Brooks Blvd. The amount of flooding can vary from event to event and can be affected by the amount of water in the Millstone.
- 19 ftSouth Bridge Street in Somerville is closed. The amount of flooding can vary from event to event and can be affected by the amount of water in the Millstone. Old York Road and Robert Street floods. Old York Road and Park Drive floods.
- 18 ftEast Dukes Parkway and several bridges in Manville are flooded. Roads throughout the area are closed due to high water. The amount of flooding can vary from event to event and can be affected by the amount of water in the Millstone.
- 17 ftStreet and roadway flooding increases across the Manville area. The Van Veghten Bridge and Main Street in Manville are flooded as well as 5th Street in Somerville. The amount of flooding can vary from event to event and can be affected by the amount of water in the Millstone.
- 16 ftLincoln Avenue in the Lost Valley section of Manville floods.
- 15 ftDukes Parkway begins to flood in Hillsborough.
- 13 ftSouthside Avenue in Somerville floods.
- 12 ftCautionary/Action stage is reached. Roads and trails flood within Dukes Park.
- 11 ftAt this level, inundation begins in Dukes Park in Manville.
Highest crests on record
- 27.66 ft — September 2, 2021
- 27.1 ft — September 17, 1999
- 26.24 ft — August 28, 2011
- 23.8 ft — August 28, 1971
- 22.41 ft — October 20, 1996
Recent crests: 20.04 ft (January 10, 2024) · 16.45 ft (December 28, 2023) · 19.84 ft (December 19, 2023) · 15.99 ft (April 8, 2022) · 27.66 ft (September 2, 2021)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (MNVN4); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.