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This probabilistic forecast is issued by the Middle Atlantic River Forecast Center.
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About this graph
Forecasts for the Millstone River at Blackwells Mills are issued routinely year-round.
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Zoom Level:16
Flood Categories (in feet)
Major Flood Stage: 15
Moderate Flood Stage: 10
Flood Stage: 9
Action Stage: 7
Low Stage (in feet): 0

Historic Crests
(1) 21.24 ft on 08/28/2011
(2) 21.01 ft on 09/17/1999
(3) 20.81 ft on 09/02/2021
(4) 19.24 ft on 04/16/2007
(5) 18.68 ft on 08/28/1971
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 13.29 ft on 01/10/2024
(2) 10.03 ft on 12/29/2023
(3) 14.22 ft on 12/19/2023
(4) 10.84 ft on 04/08/2022
(5) 20.81 ft on 09/02/2021
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 1.15 ft on 09/16/1923
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Gauge LocationGauge Map Marker
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
13 Washington Street and several businesses are flooded.
10 The D&R Canal is flooded by the Millstone River.
9 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.
7 Several more causeways are closed due to flooding.
6 The Griggstown Causeway is closed due to flooding.

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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Page last modified: 30-Oct-2020 4:10 PM
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