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This probabilistic forecast is issued by the Middle Atlantic River Forecast Center.
tab left off Hydrograph tab right off tab left off River at a Glance tab right off tab left off Download tab right off tab left off Inundation
Mapping		 tab right off tab left on tab right on
About this graph
Forecasts for the Raritan River at Manville are issued routinely year-round.
Return to Area Map

Downstream Gauge Downstream Gauge - at Bound Brook
Zoom Level:16
Flood Categories (in feet)
Major Flood Stage: 20
Moderate Flood Stage: 17
Flood Stage: 14
Action Stage: 12
Low Stage (in feet): 0

Historic Crests
(1) 27.66 ft on 09/02/2021
(2) 27.10 ft on 09/17/1999
(3) 26.24 ft on 08/28/2011
(4) 23.80 ft on 08/28/1971
(5) 22.41 ft on 10/20/1996
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 15.99 ft on 04/08/2022
(2) 27.66 ft on 09/02/2021
(3) 16.61 ft on 08/24/2021
(4) 14.00 ft on 07/18/2021
(5) 14.68 ft on 12/25/2020
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 3.25 ft on 09/19/1964
(2) 3.30 ft on 08/30/1944
(3) 3.40 ft on 10/15/1957
KML Image
Gauge LocationGauge Map Marker
 Disclaimer
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
20 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 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.
18 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 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 Lincoln Avenue in the Lost Valley section of Manville floods.
15 Dukes Parkway begins to flood in Hillsborough.
13 Southside Avenue in Somerville floods.
12 Cautionary/Action stage is reached. Roads and trails flood within Dukes Park.
11 At this level, inundation begins in Dukes Park in Manville.

Other Real-time and/or Archive Data Sources:
Additional Information Collapse
Potential River Levels - Used to
Potential River Levels
Used to Estimate the Chance of Flooding and the Range of Possible River Levels
10 day (HEFS) 10 Day (NAEFS) 10 Day (GEFS)
HEFS Ensemble NAEFS Ensemble GEFS Ensemble

Note: Use the official hydrograph at the top of this web page for river levels within the next 72 hours.

Click individual graphics to enlarge.

During winter months, cold and ice may result in inaccurate real-time stream stage and streamflow data. Adjustments or deletions of this data can only be done after detailed analysis.
Collaborative Agencies Collapse
The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
NWS Information
National Weather Service
Philadelphia/Mount Holly Weather Forecast Office
732 Woodlane Road
Mount Holly, NJ 08060-9615
(609) 261-6600
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