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Millstone River at Blackwells Mills, NJ (BKWN4)


Data Type




Inundation Levels
NAVD88 Stage

48.222.2
Record Crest: 21.24 ft
47.221.2
47.021.0
46.020.0
45.019.0
44.018.0
43.017.0
42.016.0
41.015.0

Major Flooding Begins

40.014.0
39.013.0
38.012.0
37.011.0
36.010.0

Moderate Flooding Begins

35.09.0

Minor Flooding Begins

34.08.0
33.07.0

Near Flooding Begins

32.56.5
* = 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:
1.9 ft at 08/18/2018 01:15:00 UTC
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Inundation Legend
Depth in feet
USGS Gauge Location Gauge Location
What is UTC time? Map Help

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: 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) 19.24 ft on 04/16/2007
(4) 18.68 ft on 08/28/1971
(5) 16.84 ft on 07/15/1975
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 12.58 ft on 05/28/2018
(2) 9.68 ft on 01/19/2015
(3) 15.87 ft on 05/01/2014
(4) 9.94 ft on 03/31/2014
(5) 13.77 ft on 09/09/2011
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 1.15 ft on 09/16/1923

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.

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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 causways are closed due to flooding.
6 The Griggstown Causway is closed due to flooding.
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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Page last modified: 21-Dec-2016 5:25 PM
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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.