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Hydrograph River at a Glance Download Inundation
Mapping
Millstone River at Blackwells Mills Stage (ft)Flow (kcfs)Observed: 1.91 ft at 4:45PM Aug 12, 2020Observed: 1.92 ft at 5:00PM Aug 12, 2020Observed: 1.92 ft at 5:15PM Aug 12, 2020Observed: 1.9 ft at 5:30PM Aug 12, 2020Observed: 1.9 ft at 5:45PM Aug 12, 2020Observed: 1.9 ft at 6:00PM Aug 12, 2020Observed: 1.9 ft at 6:15PM Aug 12, 2020Observed: 1.88 ft at 6:30PM Aug 12, 2020Observed: 1.88 ft at 6:45PM Aug 12, 2020Observed: 1.88 ft at 7:00PM Aug 12, 2020Observed: 1.89 ft at 7:15PM Aug 12, 2020Observed: 1.88 ft at 7:30PM Aug 12, 2020Observed: 1.88 ft at 7:45PM Aug 12, 2020Observed: 1.88 ft at 8:00PM Aug 12, 2020Observed: 1.88 ft at 8:15PM Aug 12, 2020Observed: 1.87 ft at 8:30PM Aug 12, 2020Observed: 1.87 ft at 8:45PM Aug 12, 2020Observed: 1.87 ft at 9:00PM Aug 12, 2020Observed: 1.87 ft at 9:15PM Aug 12, 2020Observed: 1.86 ft at 9:30PM Aug 12, 2020Observed: 1.86 ft at 9:45PM Aug 12, 2020Observed: 1.86 ft at 10:00PM Aug 12, 2020Observed: 1.87 ft at 10:15PM Aug 12, 2020Observed: 1.86 ft at 10:30PM Aug 12, 2020Observed: 1.86 ft at 10:45PM Aug 12, 2020Observed: 1.86 ft at 11:00PM Aug 12, 2020Observed: 1.86 ft at 11:15PM Aug 12, 2020Observed: 1.85 ft at 11:30PM Aug 12, 2020Observed: 1.85 ft at 11:45PM Aug 12, 2020Observed: 1.85 ft at 12:00AM Aug 13, 2020Observed: 1.86 ft at 12:15AM Aug 13, 2020Observed: 1.84 ft at 12:30AM Aug 13, 2020Observed: 1.84 ft at 12:45AM Aug 13, 2020Observed: 1.84 ft at 1:00AM Aug 13, 2020Observed: 1.84 ft at 1:15AM Aug 13, 2020Observed: 1.84 ft at 1:30AM Aug 13, 2020Observed: 1.84 ft at 1:45AM Aug 13, 2020Observed: 1.84 ft at 2:00AM Aug 13, 2020Observed: 1.84 ft at 2:15AM Aug 13, 2020Observed: 1.84 ft at 2:30AM Aug 13, 2020Observed: 1.84 ft at 2:45AM Aug 13, 2020Observed: 1.84 ft at 3:00AM Aug 13, 2020Observed: 1.84 ft at 3:15AM Aug 13, 2020Observed: 1.83 ft at 3:30AM Aug 13, 2020Observed: 1.83 ft at 3:45AM Aug 13, 2020Observed: 1.83 ft at 4:00AM Aug 13, 2020Observed: 1.84 ft at 4:15AM Aug 13, 2020Observed: 1.82 ft at 4:30AM Aug 13, 2020Observed: 1.82 ft at 4:45AM Aug 13, 2020Observed: 1.82 ft at 5:00AM Aug 13, 2020Observed: 1.82 ft at 5:15AM Aug 13, 2020Observed: 1.82 ft at 5:30AM Aug 13, 2020Observed: 1.82 ft at 5:45AM Aug 13, 2020Observed: 1.82 ft at 6:00AM Aug 13, 2020Observed: 1.82 ft at 6:15AM Aug 13, 2020Observed: 1.82 ft at 6:30AM Aug 13, 2020Observed: 1.82 ft at 6:45AM Aug 13, 2020Observed: 1.82 ft at 7:00AM Aug 13, 2020Observed: 1.82 ft at 7:15AM Aug 13, 2020Observed: 1.82 ft at 7:30AM Aug 13, 2020Observed: 1.82 ft at 7:45AM Aug 13, 2020Observed: 1.82 ft at 8:00AM Aug 13, 2020Observed: 1.82 ft at 8:15AM Aug 13, 2020Observed: 2.05 ft at 8:30AM Aug 13, 2020Observed: 1.97 ft at 8:45AM Aug 13, 2020Observed: 1.88 ft at 9:00AM Aug 13, 2020Observed: 1.84 ft at 9:15AM Aug 13, 2020Observed: 2.57 ft at 9:30AM Aug 13, 2020Observed: 2.43 ft at 9:45AM Aug 13, 2020Observed: 2.26 ft at 10:00AM Aug 13, 2020Observed: 2.12 ft at 10:15AM Aug 13, 2020Observed: 2.74 ft at 10:30AM Aug 13, 2020Observed: 2.73 ft at 10:45AM Aug 13, 2020Observed: 2.71 ft at 11:00AM Aug 13, 2020Observed: 2.66 ft at 11:15AM Aug 13, 2020Observed: 2.84 ft at 11:30AM Aug 13, 2020Observed: 2.8 ft at 11:45AM Aug 13, 2020Observed: 2.77 ft at 12:00PM Aug 13, 2020Observed: 2.75 ft at 12:15PM Aug 13, 2020Observed: 3.01 ft at 12:30PM Aug 13, 2020Observed: 2.96 ft at 12:45PM Aug 13, 2020Observed: 2.92 ft at 1:00PM Aug 13, 2020Observed: 2.88 ft at 1:15PM Aug 13, 2020Observed: 3.15 ft at 1:30PM Aug 13, 2020Observed: 3.12 ft at 1:45PM Aug 13, 2020Observed: 3.08 ft at 2:00PM Aug 13, 2020Observed: 3.05 ft at 2:15PM Aug 13, 2020Observed: 3.25 ft at 2:30PM Aug 13, 2020Observed: 3.22 ft at 2:45PM Aug 13, 2020Observed: 3.19 ft at 3:00PM Aug 13, 2020Observed: 3.17 ft at 3:15PM Aug 13, 2020Observed: 3.34 ft at 3:30PM Aug 13, 2020Observed: 3.31 ft at 3:45PM Aug 13, 2020Observed: 3.3 ft at 4:00PM Aug 13, 2020Observed: 3.26 ft at 4:15PM Aug 13, 2020Observed: 3.39 ft at 4:30PM Aug 13, 2020Observed: 3.38 ft at 4:45PM Aug 13, 2020Observed: 3.36 ft at 5:00PM Aug 13, 2020Observed: 3.35 ft at 5:15PM Aug 13, 2020Observed: 3.42 ft at 5:30PM Aug 13, 2020Observed: 3.42 ft at 5:45PM Aug 13, 2020Observed: 3.41 ft at 6:00PM Aug 13, 2020Observed: 3.4 ft at 6:15PM Aug 13, 2020Highest Observation: 3.44 ft at 6:30PM Aug 13, 2020Highest Observation: 3.44 ft at 6:45PM Aug 13, 2020Highest Observation: 3.44 ft at 7:00PM Aug 13, 2020Observed: 3.42 ft at 7:15PM Aug 13, 2020Observed: 3.42 ft at 8:30PM Aug 13, 2020Observed: 3.43 ft at 8:45PM Aug 13, 2020Observed: 3.43 ft at 9:00PM Aug 13, 2020Highest Observation: 3.44 ft at 9:15PM Aug 13, 2020Observed: 3.38 ft at 9:30PM Aug 13, 2020Observed: 3.4 ft at 9:45PM Aug 13, 2020Observed: 3.4 ft at 10:00PM Aug 13, 2020Observed: 3.41 ft at 10:15PM Aug 13, 2020Observed: 3.34 ft at 10:30PM Aug 13, 2020Observed: 3.35 ft at 10:45PM Aug 13, 2020Observed: 3.36 ft at 11:00PM Aug 13, 2020Observed: 3.38 ft at 11:15PM Aug 13, 2020Observed: 3.3 ft at 11:30PM Aug 13, 2020Observed: 3.3 ft at 11:45PM Aug 13, 2020Observed: 3.32 ft at 12:00AM Aug 14, 2020Observed: 3.33 ft at 12:15AM Aug 14, 2020Observed: 3.24 ft at 12:30AM Aug 14, 2020Observed: 3.25 ft at 12:45AM Aug 14, 2020Observed: 3.26 ft at 1:00AM Aug 14, 2020Observed: 3.28 ft at 1:15AM Aug 14, 2020Observed: 3.19 ft at 1:30AM Aug 14, 2020Observed: 3.2 ft at 1:45AM Aug 14, 2020Observed: 3.22 ft at 2:00AM Aug 14, 2020Observed: 3.23 ft at 2:15AM Aug 14, 2020Observed: 3.13 ft at 2:30AM Aug 14, 2020Observed: 3.14 ft at 2:45AM Aug 14, 2020Observed: 3.15 ft at 3:00AM Aug 14, 2020Observed: 3.17 ft at 3:15AM Aug 14, 2020Observed: 3.06 ft at 3:30AM Aug 14, 2020Observed: 3.08 ft at 3:45AM Aug 14, 2020Observed: 3.1 ft at 4:00AM Aug 14, 2020Observed: 3.12 ft at 4:15AM Aug 14, 2020Observed: 3 ft at 4:30AM Aug 14, 2020Observed: 3.01 ft at 4:45AM Aug 14, 2020Observed: 3.02 ft at 5:00AM Aug 14, 2020Observed: 3.04 ft at 5:15AM Aug 14, 2020Observed: 2.93 ft at 5:30AM Aug 14, 2020Observed: 2.95 ft at 5:45AM Aug 14, 2020Observed: 2.96 ft at 6:00AM Aug 14, 2020Observed: 2.98 ft at 6:15AM Aug 14, 2020Observed: 2.86 ft at 6:30AM Aug 14, 2020Observed: 2.88 ft at 6:45AM Aug 14, 2020Observed: 2.9 ft at 7:00AM Aug 14, 2020Observed: 2.91 ft at 7:15AM Aug 14, 2020Observed: 2.8 ft at 7:30AM Aug 14, 2020Observed: 2.82 ft at 7:45AM Aug 14, 2020Observed: 2.84 ft at 8:00AM Aug 14, 2020Observed: 2.86 ft at 8:15AM Aug 14, 2020Observed: 2.74 ft at 8:30AM Aug 14, 2020Observed: 2.75 ft at 8:45AM Aug 14, 2020Observed: 2.76 ft at 9:00AM Aug 14, 2020Observed: 2.78 ft at 9:15AM Aug 14, 2020Observed: 2.68 ft at 9:30AM Aug 14, 2020Observed: 2.69 ft at 9:45AM Aug 14, 2020Observed: 2.71 ft at 10:00AM Aug 14, 2020Observed: 2.72 ft at 10:15AM Aug 14, 2020Observed: 2.63 ft at 10:30AM Aug 14, 2020Observed: 2.63 ft at 10:45AM Aug 14, 2020Observed: 2.65 ft at 11:00AM Aug 14, 2020Observed: 2.67 ft at 11:15AM Aug 14, 2020Observed: 2.56 ft at 11:30AM Aug 14, 2020Observed: 2.58 ft at 11:45AM Aug 14, 2020Observed: 2.59 ft at 12:00PM Aug 14, 2020Observed: 2.61 ft at 12:15PM Aug 14, 2020Observed: 2.52 ft at 12:30PM Aug 14, 2020Observed: 2.53 ft at 12:45PM Aug 14, 2020Observed: 2.54 ft at 1:00PM Aug 14, 2020Observed: 2.56 ft at 1:15PM Aug 14, 2020Observed: 2.48 ft at 1:30PM Aug 14, 2020Observed: 2.49 ft at 1:45PM Aug 14, 2020Observed: 2.5 ft at 2:00PM Aug 14, 2020Observed: 2.5 ft at 2:15PM Aug 14, 2020Observed: 2.43 ft at 2:30PM Aug 14, 2020Observed: 2.44 ft at 2:45PM Aug 14, 2020Observed: 2.46 ft at 3:00PM Aug 14, 2020Observed: 2.47 ft at 3:15PM Aug 14, 2020Observed: 2.4 ft at 3:30PM Aug 14, 2020Observed: 2.41 ft at 3:45PM Aug 14, 2020Observed: 2.41 ft at 4:00PM Aug 14, 2020Observed: 2.43 ft at 4:15PM Aug 14, 2020Observed: 2.37 ft at 4:30PM Aug 14, 2020Observed: 2.37 ft at 4:45PM Aug 14, 2020Observed: 2.38 ft at 5:00PM Aug 14, 2020Observed: 2.39 ft at 5:15PM Aug 14, 2020Observed: 2.34 ft at 5:30PM Aug 14, 2020Observed: 2.34 ft at 5:45PM Aug 14, 2020Observed: 2.36 ft at 6:00PM Aug 14, 2020Observed: 2.36 ft at 6:15PM Aug 14, 2020Observed: 2.31 ft at 6:30PM Aug 14, 2020Observed: 2.32 ft at 6:45PM Aug 14, 2020Observed: 2.32 ft at 7:00PM Aug 14, 2020Observed: 2.34 ft at 7:15PM Aug 14, 2020Observed: 2.29 ft at 7:30PM Aug 14, 2020Observed: 2.29 ft at 7:45PM Aug 14, 2020Observed: 2.3 ft at 8:00PM Aug 14, 2020Observed: 2.31 ft at 8:15PM Aug 14, 2020Observed: 2.26 ft at 8:30PM Aug 14, 2020Observed: 2.27 ft at 8:45PM Aug 14, 2020Observed: 2.27 ft at 9:00PM Aug 14, 2020Observed: 2.27 ft at 9:15PM Aug 14, 2020Observed: 2.23 ft at 9:30PM Aug 14, 2020Observed: 2.25 ft at 9:45PM Aug 14, 2020Observed: 2.25 ft at 10:00PM Aug 14, 2020Observed: 2.25 ft at 10:15PM Aug 14, 2020Observed: 2.21 ft at 10:30PM Aug 14, 2020Observed: 2.22 ft at 10:45PM Aug 14, 2020Observed: 2.23 ft at 11:00PM Aug 14, 2020Observed: 2.23 ft at 11:15PM Aug 14, 2020Observed: 2.2 ft at 11:30PM Aug 14, 2020Observed: 2.2 ft at 11:45PM Aug 14, 2020Observed: 2.2 ft at 12:00AM Aug 15, 2020Observed: 2.2 ft at 12:15AM Aug 15, 2020Observed: 2.18 ft at 12:30AM Aug 15, 2020Observed: 2.18 ft at 12:45AM Aug 15, 2020Observed: 2.18 ft at 1:00AM Aug 15, 2020Observed: 2.18 ft at 1:15AM Aug 15, 2020Observed: 2.16 ft at 1:30AM Aug 15, 2020Observed: 2.16 ft at 1:45AM Aug 15, 2020Observed: 2.17 ft at 2:00AM Aug 15, 2020Observed: 2.18 ft at 2:15AM Aug 15, 2020Observed: 2.15 ft at 2:30AM Aug 15, 2020Observed: 2.15 ft at 2:45AM Aug 15, 2020Observed: 2.15 ft at 3:00AM Aug 15, 2020Observed: 2.15 ft at 3:15AM Aug 15, 2020Observed: 2.13 ft at 3:30AM Aug 15, 2020Observed: 2.13 ft at 3:45AM Aug 15, 2020Observed: 2.13 ft at 4:00AM Aug 15, 2020Observed: 2.14 ft at 4:15AM Aug 15, 2020Observed: 2.11 ft at 4:30AM Aug 15, 2020Observed: 2.12 ft at 4:45AM Aug 15, 2020Observed: 2.13 ft at 5:00AM Aug 15, 2020Observed: 2.13 ft at 5:15AM Aug 15, 2020Observed: 2.11 ft at 5:30AM Aug 15, 2020Observed: 2.11 ft at 5:45AM Aug 15, 2020Observed: 2.11 ft at 6:00AM Aug 15, 2020Observed: 2.11 ft at 6:15AM Aug 15, 2020Observed: 2.09 ft at 6:30AM Aug 15, 2020Observed: 2.09 ft at 6:45AM Aug 15, 2020Observed: 2.09 ft at 7:00AM Aug 15, 2020Observed: 2.1 ft at 7:15AM Aug 15, 2020Observed: 2.07 ft at 7:30AM Aug 15, 2020Observed: 2.09 ft at 7:45AM Aug 15, 2020Observed: 2.09 ft at 8:00AM Aug 15, 2020Observed: 2.09 ft at 8:15AM Aug 15, 2020Observed: 2.07 ft at 8:30AM Aug 15, 2020Observed: 2.07 ft at 8:45AM Aug 15, 2020Observed: 2.07 ft at 9:00AM Aug 15, 2020Observed: 2.07 ft at 9:15AM Aug 15, 2020Observed: 2.05 ft at 9:30AM Aug 15, 2020Observed: 2.07 ft at 9:45AM Aug 15, 2020Observed: 2.07 ft at 10:00AM Aug 15, 2020Observed: 2.07 ft at 10:15AM Aug 15, 2020Observed: 2.04 ft at 10:30AM Aug 15, 2020Observed: 2.04 ft at 10:45AM Aug 15, 2020Observed: 2.04 ft at 11:00AM Aug 15, 2020Observed: 2.05 ft at 11:15AM Aug 15, 2020Observed: 2.04 ft at 11:30AM Aug 15, 2020Observed: 2.04 ft at 11:45AM Aug 15, 2020Observed: 2.04 ft at 12:00PM Aug 15, 2020Observed: 2.04 ft at 12:15PM Aug 15, 2020Observed: 2.02 ft at 12:30PM Aug 15, 2020Observed: 2.02 ft at 12:45PM Aug 15, 2020Observed: 2.02 ft at 1:00PM Aug 15, 2020Observed: 2.02 ft at 1:15PM Aug 15, 2020Observed: 2.02 ft at 1:30PM Aug 15, 2020Observed: 2.02 ft at 1:45PM Aug 15, 2020Observed: 2.02 ft at 2:00PM Aug 15, 2020Observed: 2.02 ft at 2:15PM Aug 15, 2020Observed: 2.01 ft at 2:30PM Aug 15, 2020Observed: 2.02 ft at 2:45PM Aug 15, 2020Observed: 2.02 ft at 3:00PM Aug 15, 2020Observed: 2.02 ft at 3:15PM Aug 15, 2020Highest Forecast: 1.9 ft 8:00PM Aug 15, 2020Highest Forecast: 1.9 ft 2:00AM Aug 16, 2020Forecast: 1.8 ft 8:00AM Aug 16, 2020Forecast: 1.8 ft 2:00PM Aug 16, 2020Forecast: 1.8 ft 8:00PM Aug 16, 2020Forecast: 1.8 ft 2:00AM Aug 17, 2020Highest Forecast: 1.9 ft 8:00AM Aug 17, 2020Highest Forecast: 1.9 ft 2:00PM Aug 17, 2020Highest Forecast: 1.9 ft 8:00PM Aug 17, 2020Highest Forecast: 1.9 ft 2:00AM Aug 18, 2020Highest Forecast: 1.9 ft 8:00AM Aug 18, 2020USGS--Water Resources of the United StatesBKWN4(plotting HGIR2) Graph Created (4:33PM Aug 15, 2020)ObservedForecast (issued 9:29AM Aug 15)Latest observed value: 2.02 ft at 3:15 PM EDT 15-Aug-2020. Flood Stage is 9 ft
Printable Image
About this graph
Tabular Data (UTC)
Tabular Data (EDT)
XML Data
RSS Files
Datum: NGVD29
Metadata
NOTE: Forecasts for the Millstone River at Blackwells Mills are issued routinely year-round.
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Upstream Gauge - at Griggstown Upstream Gauge Downstream Gauge Downstream Gauge - at Weston
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) 9.02 ft on 11/28/2018
(2) 12.02 ft on 11/26/2018
(3) 12.58 ft on 05/28/2018
(4) 9.68 ft on 01/19/2015
(5) 15.87 ft on 05/01/2014
Show More Recent Crests

(P): Preliminary values subject to further review.

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

For more information on your flood risk go to www.floodsmart.gov.
Zoom Level:16
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
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.
About This Location Collapse

Latitude: 40.475000° N, Longitude: 74.575833° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 9 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)		 Elevation
(gauge height = flood stage)		 Elevation information source
NAVD88 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 26.97 ft 35.97 ft Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  

Current/Historical Observations:
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) 7 Day (NAEFS) 7 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.
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Hydrologic Resources Additional Resources
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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