Major Flood
20 ft
Current Water Level
Gage Height
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Streamflow
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Last Reading
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FLOOD STAGES
Know the flood categories.
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
Moderate Flood
17 ft
Minor Flood
14 ft
Action Stage
12 ft
What Floods at Each Level
20 ft
Flooding 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 ft
South 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 ft
East 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 ft
Street 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 ft
Lincoln Avenue in the Lost Valley section of Manville floods.
15 ft
Dukes Parkway begins to flood in Hillsborough.
13 ft
Southside Avenue in Somerville floods.
12 ft
Cautionary/Action stage is reached. Roads and trails flood within Dukes Park.
11 ft
At this level, inundation begins in Dukes Park in Manville.
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
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Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Sep 2, 2021 | 27.66 ft | 90,940 cfs |
| Sep 16, 1999 | 27.1 ft | 77,600 cfs |
| Aug 28, 2011 | 26.24 ft | 55,900 cfs |
Flood Inundation Map
NOAA has mapped what areas flood at different water levels for this gauge. View the interactive flood inundation map →
About This Gauge
USGS Site
NWS LID
MNVN4
River
Raritan River
County
Somerset, NJ
Coordinates
40.5556°N, 74.5828°W
Get Flood Alerts for Raritan River
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of Raritan River at Manville?
The Raritan River at Manville gauge is maintained by USGS (site 01400500) and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for Raritan River at Manville?
The NWS-defined flood stage for Raritan River at Manville is 14 feet. Action stage begins at 12 feet. Moderate flooding starts at 17 feet, and major flooding at 20 feet.
How do I get alerts when Raritan River rises?
Download StormCast free on Google Play, go to River Gauges, and add Raritan River at Manville to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category.
Where is the Raritan River at Manville gauge located?
The gauge is located in Somerset County, New Jersey at coordinates 40.5556°N, 74.5828°W. USGS site number: 01400500. Data is provided by the U.S. Geological Survey and the National Weather Service.
More Gauges on Raritan River
On This River
Downstream: Raritan River at Bound Brook
More Resources
Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey