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Forecast services to continue at Langhorne stream gage during Route 213 bridge construction.  Click here for forecast hydrograph, click here to access temporary USGS observations from a gage 0.55 miles downstream located at Brownsville Rd.

Hydrograph River at a Glance Download
Millstone River at Blackwells Mills Stage (ft)Flow (kcfs)Highest Observation: 2.08 ft at 8:45AM Dec 19, 2014Highest Observation: 2.08 ft at 9:00AM Dec 19, 2014Highest Observation: 2.08 ft at 9:15AM Dec 19, 2014Highest Observation: 2.08 ft at 9:30AM Dec 19, 2014Highest Observation: 2.08 ft at 9:45AM Dec 19, 2014Highest Observation: 2.08 ft at 10:00AM Dec 19, 2014Highest Observation: 2.08 ft at 10:15AM Dec 19, 2014Highest Observation: 2.08 ft at 10:30AM Dec 19, 2014Highest Observation: 2.08 ft at 10:45AM Dec 19, 2014Highest Observation: 2.08 ft at 11:00AM Dec 19, 2014Highest Observation: 2.08 ft at 11:15AM Dec 19, 2014Highest Observation: 2.08 ft at 11:30AM Dec 19, 2014Highest Observation: 2.08 ft at 11:45AM Dec 19, 2014Highest Observation: 2.08 ft at 12:00PM Dec 19, 2014Highest Observation: 2.08 ft at 12:15PM Dec 19, 2014Highest Observation: 2.08 ft at 12:30PM Dec 19, 2014Highest Observation: 2.08 ft at 12:45PM Dec 19, 2014Highest Observation: 2.08 ft at 1:00PM Dec 19, 2014Highest Observation: 2.08 ft at 1:15PM Dec 19, 2014Highest Observation: 2.08 ft at 1:30PM Dec 19, 2014Highest Observation: 2.08 ft at 1:45PM Dec 19, 2014Highest Observation: 2.08 ft at 2:00PM Dec 19, 2014Highest Observation: 2.08 ft at 2:15PM Dec 19, 2014Highest Observation: 2.08 ft at 2:30PM Dec 19, 2014Highest Observation: 2.08 ft at 2:45PM Dec 19, 2014Highest Observation: 2.08 ft at 3:00PM Dec 19, 2014Observed: 2.06 ft at 3:15PM Dec 19, 2014Observed: 2.06 ft at 3:30PM Dec 19, 2014Observed: 2.06 ft at 3:45PM Dec 19, 2014Observed: 2.06 ft at 4:00PM Dec 19, 2014Observed: 2.06 ft at 4:15PM Dec 19, 2014Observed: 2.06 ft at 4:30PM Dec 19, 2014Observed: 2.06 ft at 4:45PM Dec 19, 2014Observed: 2.06 ft at 5:00PM Dec 19, 2014Observed: 2.06 ft at 5:15PM Dec 19, 2014Observed: 2.06 ft at 5:30PM Dec 19, 2014Observed: 2.06 ft at 5:45PM Dec 19, 2014Observed: 2.06 ft at 6:00PM Dec 19, 2014Observed: 2.06 ft at 6:15PM Dec 19, 2014Observed: 2.06 ft at 6:30PM Dec 19, 2014Observed: 2.06 ft at 6:45PM Dec 19, 2014Observed: 2.06 ft at 7:00PM Dec 19, 2014Observed: 2.06 ft at 7:15PM Dec 19, 2014Observed: 2.06 ft at 7:30PM Dec 19, 2014Observed: 2.06 ft at 7:45PM Dec 19, 2014Observed: 2.06 ft at 8:00PM Dec 19, 2014Observed: 2.06 ft at 8:15PM Dec 19, 2014Observed: 2.06 ft at 8:30PM Dec 19, 2014Observed: 2.06 ft at 8:45PM Dec 19, 2014Observed: 2.06 ft at 9:00PM Dec 19, 2014Observed: 2.06 ft at 9:15PM Dec 19, 2014Observed: 2.06 ft at 9:30PM Dec 19, 2014Observed: 2.06 ft at 9:45PM Dec 19, 2014Observed: 2.06 ft at 10:00PM Dec 19, 2014Observed: 2.06 ft at 10:15PM Dec 19, 2014Observed: 2.06 ft at 10:30PM Dec 19, 2014Observed: 2.06 ft at 10:45PM Dec 19, 2014Observed: 2.06 ft at 11:00PM Dec 19, 2014Observed: 2.06 ft at 11:15PM Dec 19, 2014Observed: 2.06 ft at 11:30PM Dec 19, 2014Observed: 2.06 ft at 11:45PM Dec 19, 2014Observed: 2.06 ft at 12:00AM Dec 20, 2014Observed: 2.06 ft at 12:15AM Dec 20, 2014Observed: 2.06 ft at 12:30AM Dec 20, 2014Observed: 2.06 ft at 12:45AM Dec 20, 2014Observed: 2.06 ft at 1:00AM Dec 20, 2014Observed: 2.06 ft at 1:15AM Dec 20, 2014Observed: 2.06 ft at 1:30AM Dec 20, 2014Observed: 2.06 ft at 1:45AM Dec 20, 2014Observed: 2.06 ft at 2:00AM Dec 20, 2014Observed: 2.06 ft at 2:15AM Dec 20, 2014Observed: 2.06 ft at 2:30AM Dec 20, 2014Observed: 2.06 ft at 2:45AM Dec 20, 2014Observed: 2.06 ft at 3:00AM Dec 20, 2014Observed: 2.06 ft at 3:15AM Dec 20, 2014Observed: 2.06 ft at 3:30AM Dec 20, 2014Observed: 2.06 ft at 3:45AM Dec 20, 2014Observed: 2.06 ft at 4:00AM Dec 20, 2014Observed: 2.06 ft at 4:15AM Dec 20, 2014Observed: 2.06 ft at 4:30AM Dec 20, 2014Observed: 2.06 ft at 4:45AM Dec 20, 2014Observed: 2.06 ft at 5:00AM Dec 20, 2014Observed: 2.05 ft at 5:15AM Dec 20, 2014Observed: 2.05 ft at 5:30AM Dec 20, 2014Observed: 2.05 ft at 5:45AM Dec 20, 2014Observed: 2.05 ft at 6:00AM Dec 20, 2014Observed: 2.05 ft at 6:15AM Dec 20, 2014Observed: 2.05 ft at 6:30AM Dec 20, 2014Observed: 2.03 ft at 6:45AM Dec 20, 2014Observed: 2.03 ft at 7:00AM Dec 20, 2014Observed: 2.03 ft at 7:15AM Dec 20, 2014Observed: 2.03 ft at 7:30AM Dec 20, 2014Observed: 2.03 ft at 7:45AM Dec 20, 2014Observed: 2.03 ft at 8:00AM Dec 20, 2014Observed: 2.03 ft at 8:15AM Dec 20, 2014Observed: 2.03 ft at 8:30AM Dec 20, 2014Observed: 2.03 ft at 8:45AM Dec 20, 2014Observed: 2.03 ft at 9:00AM Dec 20, 2014Observed: 2.03 ft at 9:15AM Dec 20, 2014Observed: 2.03 ft at 9:30AM Dec 20, 2014Observed: 2.03 ft at 9:45AM Dec 20, 2014Observed: 2.03 ft at 10:00AM Dec 20, 2014Observed: 2.03 ft at 10:15AM Dec 20, 2014Observed: 2.03 ft at 10:30AM Dec 20, 2014Observed: 2.03 ft at 10:45AM Dec 20, 2014Observed: 2.03 ft at 11:00AM Dec 20, 2014Observed: 2.03 ft at 11:15AM Dec 20, 2014Observed: 2.03 ft at 11:30AM Dec 20, 2014Observed: 2.03 ft at 11:45AM Dec 20, 2014Observed: 2.03 ft at 12:00PM Dec 20, 2014Observed: 2.03 ft at 12:15PM Dec 20, 2014Observed: 2.03 ft at 12:30PM Dec 20, 2014Observed: 2.03 ft at 12:45PM Dec 20, 2014Observed: 2.03 ft at 1:00PM Dec 20, 2014Observed: 2.03 ft at 1:15PM Dec 20, 2014Observed: 2.02 ft at 1:30PM Dec 20, 2014Observed: 2.02 ft at 1:45PM Dec 20, 2014Observed: 2.02 ft at 2:00PM Dec 20, 2014Observed: 2.02 ft at 2:15PM Dec 20, 2014Observed: 2.02 ft at 2:30PM Dec 20, 2014Observed: 2.02 ft at 2:45PM Dec 20, 2014Observed: 2.02 ft at 3:00PM Dec 20, 2014Observed: 2.02 ft at 3:15PM Dec 20, 2014Observed: 2.02 ft at 3:30PM Dec 20, 2014Observed: 2.02 ft at 3:45PM Dec 20, 2014Observed: 2.02 ft at 4:00PM Dec 20, 2014Observed: 2.02 ft at 4:15PM Dec 20, 2014Observed: 2.02 ft at 4:30PM Dec 20, 2014Observed: 2.02 ft at 4:45PM Dec 20, 2014Observed: 2.02 ft at 5:00PM Dec 20, 2014Observed: 2.02 ft at 5:15PM Dec 20, 2014Observed: 2.02 ft at 5:30PM Dec 20, 2014Observed: 2.02 ft at 5:45PM Dec 20, 2014Observed: 2.02 ft at 6:00PM Dec 20, 2014Observed: 2.02 ft at 6:15PM Dec 20, 2014Observed: 2.02 ft at 6:30PM Dec 20, 2014Observed: 2.02 ft at 6:45PM Dec 20, 2014Observed: 2.02 ft at 7:00PM Dec 20, 2014Observed: 2.02 ft at 7:15PM Dec 20, 2014Observed: 2.02 ft at 7:30PM Dec 20, 2014Observed: 2.02 ft at 7:45PM Dec 20, 2014Observed: 2.02 ft at 8:00PM Dec 20, 2014Observed: 2.02 ft at 8:15PM Dec 20, 2014Observed: 2.02 ft at 8:30PM Dec 20, 2014Observed: 2.02 ft at 8:45PM Dec 20, 2014Observed: 2.02 ft at 9:00PM Dec 20, 2014Observed: 2.02 ft at 9:15PM Dec 20, 2014Observed: 2.02 ft at 9:30PM Dec 20, 2014Observed: 2.02 ft at 9:45PM Dec 20, 2014Observed: 2.02 ft at 10:00PM Dec 20, 2014Observed: 2.02 ft at 10:15PM Dec 20, 2014Observed: 2.02 ft at 10:30PM Dec 20, 2014Observed: 2.02 ft at 10:45PM Dec 20, 2014Observed: 2.02 ft at 11:00PM Dec 20, 2014Observed: 2.02 ft at 11:15PM Dec 20, 2014Observed: 2.02 ft at 11:30PM Dec 20, 2014Observed: 2.02 ft at 11:45PM Dec 20, 2014Observed: 2.02 ft at 12:00AM Dec 21, 2014Observed: 2.02 ft at 12:15AM Dec 21, 2014Observed: 2.01 ft at 12:30AM Dec 21, 2014Observed: 1.99 ft at 12:45AM Dec 21, 2014Observed: 1.99 ft at 1:00AM Dec 21, 2014Observed: 1.99 ft at 1:15AM Dec 21, 2014Observed: 1.99 ft at 1:30AM Dec 21, 2014Observed: 1.99 ft at 1:45AM Dec 21, 2014Observed: 1.99 ft at 2:00AM Dec 21, 2014Observed: 1.99 ft at 2:15AM Dec 21, 2014Observed: 1.99 ft at 2:30AM Dec 21, 2014Observed: 1.99 ft at 2:45AM Dec 21, 2014Observed: 1.99 ft at 3:00AM Dec 21, 2014Observed: 1.99 ft at 3:15AM Dec 21, 2014Observed: 1.99 ft at 3:30AM Dec 21, 2014Observed: 1.99 ft at 3:45AM Dec 21, 2014Observed: 1.99 ft at 4:00AM Dec 21, 2014Observed: 1.99 ft at 4:15AM Dec 21, 2014Observed: 1.98 ft at 4:30AM Dec 21, 2014Observed: 1.98 ft at 4:45AM Dec 21, 2014Observed: 1.98 ft at 5:00AM Dec 21, 2014Observed: 1.98 ft at 5:15AM Dec 21, 2014Observed: 1.98 ft at 5:30AM Dec 21, 2014Observed: 1.98 ft at 5:45AM Dec 21, 2014Observed: 1.98 ft at 6:00AM Dec 21, 2014Observed: 1.98 ft at 6:15AM Dec 21, 2014Observed: 1.98 ft at 6:30AM Dec 21, 2014Observed: 1.98 ft at 6:45AM Dec 21, 2014Observed: 1.98 ft at 7:00AM Dec 21, 2014Observed: 1.98 ft at 7:15AM Dec 21, 2014Observed: 1.98 ft at 7:30AM Dec 21, 2014Observed: 1.98 ft at 7:45AM Dec 21, 2014Observed: 1.98 ft at 8:00AM Dec 21, 2014Observed: 1.98 ft at 8:15AM Dec 21, 2014Observed: 1.98 ft at 8:30AM Dec 21, 2014Observed: 1.98 ft at 8:45AM Dec 21, 2014Observed: 1.98 ft at 9:00AM Dec 21, 2014Observed: 1.98 ft at 9:15AM Dec 21, 2014Observed: 1.98 ft at 9:30AM Dec 21, 2014Observed: 1.98 ft at 9:45AM Dec 21, 2014Observed: 1.98 ft at 10:00AM Dec 21, 2014Observed: 1.98 ft at 10:15AM Dec 21, 2014Observed: 1.98 ft at 10:30AM Dec 21, 2014Observed: 1.98 ft at 10:45AM Dec 21, 2014Observed: 1.98 ft at 11:00AM Dec 21, 2014Observed: 1.98 ft at 11:15AM Dec 21, 2014Observed: 1.98 ft at 11:30AM Dec 21, 2014Observed: 1.98 ft at 11:45AM Dec 21, 2014Observed: 1.98 ft at 12:00PM Dec 21, 2014Observed: 1.98 ft at 12:15PM Dec 21, 2014Observed: 1.98 ft at 12:30PM Dec 21, 2014Observed: 1.98 ft at 12:45PM Dec 21, 2014Observed: 1.98 ft at 1:00PM Dec 21, 2014Observed: 1.98 ft at 1:15PM Dec 21, 2014Observed: 1.96 ft at 1:30PM Dec 21, 2014Observed: 1.96 ft at 1:45PM Dec 21, 2014Observed: 1.96 ft at 2:00PM Dec 21, 2014Observed: 1.96 ft at 2:15PM Dec 21, 2014Observed: 1.96 ft at 2:30PM Dec 21, 2014Observed: 1.96 ft at 2:45PM Dec 21, 2014Observed: 1.96 ft at 3:00PM Dec 21, 2014Observed: 1.96 ft at 3:15PM Dec 21, 2014Observed: 1.96 ft at 3:30PM Dec 21, 2014Observed: 1.96 ft at 3:45PM Dec 21, 2014Observed: 1.96 ft at 4:00PM Dec 21, 2014Observed: 1.96 ft at 4:15PM Dec 21, 2014Observed: 1.96 ft at 4:30PM Dec 21, 2014Observed: 1.96 ft at 4:45PM Dec 21, 2014Observed: 1.96 ft at 5:00PM Dec 21, 2014Observed: 1.96 ft at 5:15PM Dec 21, 2014Observed: 1.96 ft at 5:30PM Dec 21, 2014Observed: 1.96 ft at 5:45PM Dec 21, 2014Observed: 1.96 ft at 6:00PM Dec 21, 2014Observed: 1.96 ft at 6:15PM Dec 21, 2014Observed: 1.96 ft at 6:30PM Dec 21, 2014Observed: 1.96 ft at 6:45PM Dec 21, 2014Observed: 1.96 ft at 7:00PM Dec 21, 2014Observed: 1.96 ft at 7:15PM Dec 21, 2014Observed: 1.96 ft at 7:30PM Dec 21, 2014Observed: 1.96 ft at 7:45PM Dec 21, 2014Observed: 1.96 ft at 8:00PM Dec 21, 2014Observed: 1.96 ft at 8:15PM Dec 21, 2014Observed: 1.96 ft at 8:30PM Dec 21, 2014Observed: 1.96 ft at 8:45PM Dec 21, 2014Observed: 1.96 ft at 9:00PM Dec 21, 2014Observed: 1.96 ft at 9:15PM Dec 21, 2014Observed: 1.96 ft at 9:30PM Dec 21, 2014Observed: 1.96 ft at 9:45PM Dec 21, 2014Observed: 1.96 ft at 10:00PM Dec 21, 2014Observed: 1.96 ft at 10:15PM Dec 21, 2014Observed: 1.96 ft at 10:30PM Dec 21, 2014Observed: 1.96 ft at 10:45PM Dec 21, 2014Observed: 1.96 ft at 11:00PM Dec 21, 2014Observed: 1.96 ft at 11:15PM Dec 21, 2014Observed: 1.96 ft at 11:30PM Dec 21, 2014Observed: 1.96 ft at 11:45PM Dec 21, 2014Observed: 1.96 ft at 12:00AM Dec 22, 2014Observed: 1.96 ft at 12:15AM Dec 22, 2014Observed: 1.96 ft at 12:30AM Dec 22, 2014Observed: 1.96 ft at 12:45AM Dec 22, 2014Observed: 1.96 ft at 1:00AM Dec 22, 2014Observed: 1.96 ft at 1:15AM Dec 22, 2014Observed: 1.96 ft at 1:30AM Dec 22, 2014Observed: 1.96 ft at 1:45AM Dec 22, 2014Observed: 1.96 ft at 2:00AM Dec 22, 2014Observed: 1.96 ft at 2:15AM Dec 22, 2014Observed: 1.96 ft at 2:30AM Dec 22, 2014Observed: 1.96 ft at 2:45AM Dec 22, 2014Observed: 1.96 ft at 3:00AM Dec 22, 2014Observed: 1.96 ft at 3:15AM Dec 22, 2014Observed: 1.96 ft at 3:30AM Dec 22, 2014Observed: 1.96 ft at 3:45AM Dec 22, 2014Observed: 1.96 ft at 4:00AM Dec 22, 2014Observed: 1.96 ft at 4:15AM Dec 22, 2014Observed: 1.96 ft at 4:30AM Dec 22, 2014Observed: 1.96 ft at 4:45AM Dec 22, 2014Observed: 1.96 ft at 5:00AM Dec 22, 2014Observed: 1.96 ft at 5:15AM Dec 22, 2014Observed: 1.96 ft at 5:30AM Dec 22, 2014Observed: 1.96 ft at 5:45AM Dec 22, 2014Observed: 1.96 ft at 6:00AM Dec 22, 2014Observed: 1.96 ft at 6:15AM Dec 22, 2014Observed: 1.96 ft at 6:30AM Dec 22, 2014Observed: 1.96 ft at 6:45AM Dec 22, 2014Observed: 1.96 ft at 7:00AM Dec 22, 2014Observed: 1.96 ft at 7:15AM Dec 22, 2014Forecast: 2 ft 1:00PM Dec 22, 2014Forecast: 2 ft 7:00PM Dec 22, 2014Forecast: 2 ft 1:00AM Dec 23, 2014Forecast: 2.2 ft 7:00AM Dec 23, 2014Forecast: 2.2 ft 1:00PM Dec 23, 2014Forecast: 2.3 ft 7:00PM Dec 23, 2014Forecast: 2.3 ft 1:00AM Dec 24, 2014Highest Forecast: 2.4 ft 7:00AM Dec 24, 2014USGS--Water Resources of the United StatesBKWN4(plotting HGIRG) Graph Created (8:32AM Dec 22, 2014)ObservedForecast (issued 9:36AM Dec 21)Latest observed value: 1.96 ft at 7:15 AM EST 22-Dec-2014. Flood Stage is 9 ft
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About this graph
Tabular Data (UTC)
Tabular Data (EST)
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) 15.87 ft on 05/01/2014
(2) 9.94 ft on 03/31/2014
(3) 13.77 ft on 09/09/2011
(4) 21.24 ft on 08/28/2011
(5) 9.19 ft on 03/12/2011
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
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.
Resources Collapse
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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Page last modified: 20-Nov-2014 2:55 AM
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