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Raritan River at Manville, NJ (MNVN4)

Data Type




Inundation Levels
NAVD88 Stage

46.827.1
Record Crest: 27.1 ft
45.726.0
44.825.1
43.824.1
42.923.2
42.022.3
41.021.3
40.120.4
Major Flooding Begins

39.219.5
38.218.5
37.317.6
Moderate Flooding Begins

36.416.7
35.415.7
34.514.8
Minor Flooding Begins

33.613.9
32.612.9
Near Flooding Begins

31.712.0
31.211.5
Below Flooding Begins

* = Extended rating
Weather Forecast Office Philadelphia/Mount Holly, NJ Middle Atlantic River Forecast Center
Hydrograph River at a Glance Download Inundation
Mapping
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Click on mapped inundation to see water depth values for that location, or hold shift and drag to zoom to area.

Current Stage:
9.5 ft at 03/22/2019 16:15:00 UTC
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Inundation Legend
Depth in feet
USGS Gauge Location Gauge Location
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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.

Gauge Information Collapse

Map Overlays
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) 27.10 ft on 09/17/1999
(2) 26.24 ft on 08/28/2011
(3) 23.80 ft on 08/28/1971
(4) 22.41 ft on 10/20/1996
(5) 22.30 ft on 04/16/2007
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 16.12 ft on 11/25/2018
(2) 19.99 ft on 05/01/2014
(3) 19.18 ft on 09/08/2011
(4) 26.24 ft on 08/28/2011
(5) 17.30 ft on 04/17/2011
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

Graphical representation of flood inundation for NWS flood categories are based on steady state hydraulic modeling of water surface elevations for incremented discharges. Map shows approximate inundation areas for given water surface elevations and should not be used for navigation or permitting or other legal purposes, but strictly as a planning reference tool.
Flood Impacts 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 Data Sources Collapse
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
3 Day (SREF) 7 Day (NAEFS) 7 Day (GEFS)
SREF Ensemble NAEFS Ensemble  GEFS Ensemble 

Note: Use the official hydrograph at the top of this web page for river levels within the next 48 hours.

See the Product Description Document link for more details on the interpretation of the 3,7 day graphics. 

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.
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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.
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Graphical representation of flood inundation for NWS flood categories are based on steady state hydraulic modeling of water surface elevations for incremented discharges. Map shows approximate inundation areas for given water surface elevations and should not be used for navigation or permitting or other legal purposes, but strictly as a planning reference tool.