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Hydrograph River at a Glance Download
Millstone River at Griggstown Stage (ft)Observed: 3.25 ft at 5:00PM Aug 12, 2020Observed: 3.25 ft at 5:15PM Aug 12, 2020Observed: 3.25 ft at 5:30PM Aug 12, 2020Observed: 3.25 ft at 5:45PM Aug 12, 2020Observed: 3.24 ft at 6:00PM Aug 12, 2020Observed: 3.24 ft at 6:15PM Aug 12, 2020Observed: 3.24 ft at 6:30PM Aug 12, 2020Observed: 3.24 ft at 6:45PM Aug 12, 2020Observed: 3.24 ft at 7:00PM Aug 12, 2020Observed: 3.24 ft at 7:15PM Aug 12, 2020Observed: 3.24 ft at 7:30PM Aug 12, 2020Observed: 3.24 ft at 7:45PM Aug 12, 2020Observed: 3.24 ft at 8:00PM Aug 12, 2020Observed: 3.24 ft at 8:15PM Aug 12, 2020Observed: 3.23 ft at 8:30PM Aug 12, 2020Observed: 3.24 ft at 8:45PM Aug 12, 2020Observed: 3.23 ft at 9:00PM Aug 12, 2020Observed: 3.22 ft at 9:15PM Aug 12, 2020Observed: 3.23 ft at 9:30PM Aug 12, 2020Observed: 3.22 ft at 9:45PM Aug 12, 2020Observed: 3.22 ft at 10:00PM Aug 12, 2020Observed: 3.22 ft at 10:15PM Aug 12, 2020Observed: 3.22 ft at 10:30PM Aug 12, 2020Observed: 3.21 ft at 10:45PM Aug 12, 2020Observed: 3.21 ft at 11:00PM Aug 12, 2020Observed: 3.21 ft at 11:15PM Aug 12, 2020Observed: 3.21 ft at 11:30PM Aug 12, 2020Observed: 3.21 ft at 11:45PM Aug 12, 2020Observed: 3.2 ft at 12:00AM Aug 13, 2020Observed: 3.2 ft at 12:15AM Aug 13, 2020Observed: 3.2 ft at 12:30AM Aug 13, 2020Observed: 3.2 ft at 12:45AM Aug 13, 2020Observed: 3.2 ft at 1:00AM Aug 13, 2020Observed: 3.2 ft at 1:15AM Aug 13, 2020Observed: 3.19 ft at 1:30AM Aug 13, 2020Observed: 3.19 ft at 1:45AM Aug 13, 2020Observed: 3.19 ft at 2:00AM Aug 13, 2020Observed: 3.18 ft at 2:15AM Aug 13, 2020Observed: 3.19 ft at 2:30AM Aug 13, 2020Observed: 3.19 ft at 2:45AM Aug 13, 2020Observed: 3.18 ft at 3:00AM Aug 13, 2020Observed: 3.18 ft at 3:15AM Aug 13, 2020Observed: 3.18 ft at 3:30AM Aug 13, 2020Observed: 3.17 ft at 3:45AM Aug 13, 2020Observed: 3.18 ft at 4:00AM Aug 13, 2020Observed: 3.17 ft at 4:15AM Aug 13, 2020Observed: 3.17 ft at 4:30AM Aug 13, 2020Observed: 3.17 ft at 4:45AM Aug 13, 2020Observed: 3.17 ft at 5:00AM Aug 13, 2020Observed: 3.17 ft at 5:15AM Aug 13, 2020Observed: 3.17 ft at 5:30AM Aug 13, 2020Observed: 3.16 ft at 5:45AM Aug 13, 2020Observed: 3.16 ft at 6:00AM Aug 13, 2020Observed: 3.16 ft at 6:15AM Aug 13, 2020Observed: 3.15 ft at 6:30AM Aug 13, 2020Observed: 3.16 ft at 6:45AM Aug 13, 2020Observed: 3.15 ft at 7:00AM Aug 13, 2020Observed: 3.15 ft at 7:15AM Aug 13, 2020Observed: 3.15 ft at 7:30AM Aug 13, 2020Observed: 3.14 ft at 7:45AM Aug 13, 2020Observed: 3.15 ft at 8:00AM Aug 13, 2020Observed: 3.2 ft at 8:15AM Aug 13, 2020Observed: 3.26 ft at 8:30AM Aug 13, 2020Observed: 3.4 ft at 8:45AM Aug 13, 2020Observed: 3.81 ft at 9:00AM Aug 13, 2020Observed: 4.17 ft at 9:15AM Aug 13, 2020Observed: 4.39 ft at 9:30AM Aug 13, 2020Observed: 4.52 ft at 9:45AM Aug 13, 2020Observed: 4.59 ft at 10:00AM Aug 13, 2020Observed: 4.65 ft at 10:15AM Aug 13, 2020Observed: 4.71 ft at 10:30AM Aug 13, 2020Observed: 4.76 ft at 10:45AM Aug 13, 2020Observed: 4.8 ft at 11:00AM Aug 13, 2020Observed: 4.85 ft at 11:15AM Aug 13, 2020Observed: 4.93 ft at 11:30AM Aug 13, 2020Observed: 5.01 ft at 11:45AM Aug 13, 2020Observed: 5.13 ft at 12:00PM Aug 13, 2020Observed: 5.26 ft at 12:15PM Aug 13, 2020Observed: 5.39 ft at 12:30PM Aug 13, 2020Observed: 5.52 ft at 12:45PM Aug 13, 2020Observed: 5.65 ft at 1:00PM Aug 13, 2020Observed: 5.77 ft at 1:15PM Aug 13, 2020Observed: 5.87 ft at 1:30PM Aug 13, 2020Observed: 5.96 ft at 1:45PM Aug 13, 2020Observed: 6.03 ft at 2:00PM Aug 13, 2020Observed: 6.11 ft at 2:15PM Aug 13, 2020Observed: 6.16 ft at 2:30PM Aug 13, 2020Observed: 6.21 ft at 2:45PM Aug 13, 2020Observed: 6.26 ft at 3:00PM Aug 13, 2020Observed: 6.3 ft at 3:15PM Aug 13, 2020Observed: 6.33 ft at 3:30PM Aug 13, 2020Observed: 6.35 ft at 3:45PM Aug 13, 2020Observed: 6.38 ft at 4:00PM Aug 13, 2020Observed: 6.4 ft at 4:15PM Aug 13, 2020Observed: 6.42 ft at 4:30PM Aug 13, 2020Observed: 6.44 ft at 4:45PM Aug 13, 2020Observed: 6.46 ft at 5:00PM Aug 13, 2020Observed: 6.48 ft at 5:15PM Aug 13, 2020Observed: 6.48 ft at 5:30PM Aug 13, 2020Observed: 6.49 ft at 5:45PM Aug 13, 2020Highest Observation: 6.5 ft at 6:00PM Aug 13, 2020Highest Observation: 6.5 ft at 6:15PM Aug 13, 2020Highest Observation: 6.5 ft at 6:30PM Aug 13, 2020Highest Observation: 6.5 ft at 6:45PM Aug 13, 2020Observed: 6.49 ft at 7:00PM Aug 13, 2020Observed: 6.49 ft at 7:15PM Aug 13, 2020Observed: 6.49 ft at 7:30PM Aug 13, 2020Observed: 6.48 ft at 7:45PM Aug 13, 2020Observed: 6.47 ft at 8:00PM Aug 13, 2020Observed: 6.47 ft at 8:15PM Aug 13, 2020Observed: 6.46 ft at 8:30PM Aug 13, 2020Observed: 6.45 ft at 8:45PM Aug 13, 2020Observed: 6.44 ft at 9:00PM Aug 13, 2020Observed: 6.43 ft at 9:15PM Aug 13, 2020Observed: 6.41 ft at 9:30PM Aug 13, 2020Observed: 6.4 ft at 9:45PM Aug 13, 2020Observed: 6.38 ft at 10:00PM Aug 13, 2020Observed: 6.37 ft at 10:15PM Aug 13, 2020Observed: 6.36 ft at 10:30PM Aug 13, 2020Observed: 6.34 ft at 10:45PM Aug 13, 2020Observed: 6.32 ft at 11:00PM Aug 13, 2020Observed: 6.3 ft at 11:15PM Aug 13, 2020Observed: 6.29 ft at 11:30PM Aug 13, 2020Observed: 6.27 ft at 11:45PM Aug 13, 2020Observed: 6.26 ft at 12:00AM Aug 14, 2020Observed: 6.23 ft at 12:15AM Aug 14, 2020Observed: 6.22 ft at 12:30AM Aug 14, 2020Observed: 6.2 ft at 12:45AM Aug 14, 2020Observed: 6.18 ft at 1:00AM Aug 14, 2020Observed: 6.16 ft at 1:15AM Aug 14, 2020Observed: 6.14 ft at 1:30AM Aug 14, 2020Observed: 6.11 ft at 1:45AM Aug 14, 2020Observed: 6.09 ft at 2:00AM Aug 14, 2020Observed: 6.07 ft at 2:15AM Aug 14, 2020Observed: 6.05 ft at 2:30AM Aug 14, 2020Observed: 6.03 ft at 2:45AM Aug 14, 2020Observed: 6 ft at 3:00AM Aug 14, 2020Observed: 5.98 ft at 3:15AM Aug 14, 2020Observed: 5.95 ft at 3:30AM Aug 14, 2020Observed: 5.93 ft at 3:45AM Aug 14, 2020Observed: 5.9 ft at 4:00AM Aug 14, 2020Observed: 5.87 ft at 4:15AM Aug 14, 2020Observed: 5.84 ft at 4:30AM Aug 14, 2020Observed: 5.81 ft at 4:45AM Aug 14, 2020Observed: 5.79 ft at 5:00AM Aug 14, 2020Observed: 5.76 ft at 5:15AM Aug 14, 2020Observed: 5.73 ft at 5:30AM Aug 14, 2020Observed: 5.7 ft at 5:45AM Aug 14, 2020Observed: 5.67 ft at 6:00AM Aug 14, 2020Observed: 5.64 ft at 6:15AM Aug 14, 2020Observed: 5.61 ft at 6:30AM Aug 14, 2020Observed: 5.57 ft at 6:45AM Aug 14, 2020Observed: 5.54 ft at 7:00AM Aug 14, 2020Observed: 5.51 ft at 7:15AM Aug 14, 2020Observed: 5.48 ft at 7:30AM Aug 14, 2020Observed: 5.45 ft at 7:45AM Aug 14, 2020Observed: 5.41 ft at 8:00AM Aug 14, 2020Observed: 5.38 ft at 8:15AM Aug 14, 2020Observed: 5.35 ft at 8:30AM Aug 14, 2020Observed: 5.32 ft at 8:45AM Aug 14, 2020Observed: 5.29 ft at 9:00AM Aug 14, 2020Observed: 5.26 ft at 9:15AM Aug 14, 2020Observed: 5.23 ft at 9:30AM Aug 14, 2020Observed: 5.2 ft at 9:45AM Aug 14, 2020Observed: 5.16 ft at 10:00AM Aug 14, 2020Observed: 5.13 ft at 10:15AM Aug 14, 2020Observed: 5.1 ft at 10:30AM Aug 14, 2020Observed: 5.07 ft at 10:45AM Aug 14, 2020Observed: 5.04 ft at 11:00AM Aug 14, 2020Observed: 5.01 ft at 11:15AM Aug 14, 2020Observed: 4.98 ft at 11:30AM Aug 14, 2020Observed: 4.95 ft at 11:45AM Aug 14, 2020Observed: 4.92 ft at 12:00PM Aug 14, 2020Observed: 4.89 ft at 12:15PM Aug 14, 2020Observed: 4.86 ft at 12:30PM Aug 14, 2020Observed: 4.84 ft at 12:45PM Aug 14, 2020Observed: 4.81 ft at 1:00PM Aug 14, 2020Observed: 4.79 ft at 1:15PM Aug 14, 2020Observed: 4.76 ft at 1:30PM Aug 14, 2020Observed: 4.73 ft at 1:45PM Aug 14, 2020Observed: 4.71 ft at 2:00PM Aug 14, 2020Observed: 4.69 ft at 2:15PM Aug 14, 2020Observed: 4.66 ft at 2:30PM Aug 14, 2020Observed: 4.64 ft at 2:45PM Aug 14, 2020Observed: 4.62 ft at 3:00PM Aug 14, 2020Observed: 4.6 ft at 3:15PM Aug 14, 2020Observed: 4.58 ft at 3:30PM Aug 14, 2020Observed: 4.56 ft at 3:45PM Aug 14, 2020Observed: 4.54 ft at 4:00PM Aug 14, 2020Observed: 4.52 ft at 4:15PM Aug 14, 2020Observed: 4.5 ft at 4:30PM Aug 14, 2020Observed: 4.47 ft at 4:45PM Aug 14, 2020Observed: 4.46 ft at 5:00PM Aug 14, 2020Observed: 4.44 ft at 5:15PM Aug 14, 2020Observed: 4.42 ft at 5:30PM Aug 14, 2020Observed: 4.4 ft at 5:45PM Aug 14, 2020Observed: 4.39 ft at 6:00PM Aug 14, 2020Observed: 4.37 ft at 6:15PM Aug 14, 2020Observed: 4.35 ft at 6:30PM Aug 14, 2020Observed: 4.33 ft at 6:45PM Aug 14, 2020Observed: 4.32 ft at 7:00PM Aug 14, 2020Observed: 4.3 ft at 7:15PM Aug 14, 2020Observed: 4.28 ft at 7:30PM Aug 14, 2020Observed: 4.27 ft at 7:45PM Aug 14, 2020Observed: 4.26 ft at 8:00PM Aug 14, 2020Observed: 4.24 ft at 8:15PM Aug 14, 2020Observed: 4.22 ft at 8:30PM Aug 14, 2020Observed: 4.21 ft at 8:45PM Aug 14, 2020Observed: 4.19 ft at 9:00PM Aug 14, 2020Observed: 4.18 ft at 9:15PM Aug 14, 2020Observed: 4.16 ft at 9:30PM Aug 14, 2020Observed: 4.15 ft at 9:45PM Aug 14, 2020Observed: 4.14 ft at 10:00PM Aug 14, 2020Observed: 4.12 ft at 10:15PM Aug 14, 2020Observed: 4.11 ft at 10:30PM Aug 14, 2020Observed: 4.09 ft at 10:45PM Aug 14, 2020Observed: 4.09 ft at 11:00PM Aug 14, 2020Observed: 4.07 ft at 11:15PM Aug 14, 2020Observed: 4.06 ft at 11:30PM Aug 14, 2020Observed: 4.05 ft at 11:45PM Aug 14, 2020Observed: 4.04 ft at 12:00AM Aug 15, 2020Observed: 4.03 ft at 12:15AM Aug 15, 2020Observed: 4.02 ft at 12:30AM Aug 15, 2020Observed: 4.01 ft at 12:45AM Aug 15, 2020Observed: 4 ft at 1:00AM Aug 15, 2020Observed: 3.99 ft at 1:15AM Aug 15, 2020Observed: 3.98 ft at 1:30AM Aug 15, 2020Observed: 3.97 ft at 1:45AM Aug 15, 2020Observed: 3.96 ft at 2:00AM Aug 15, 2020Observed: 3.96 ft at 2:15AM Aug 15, 2020Observed: 3.94 ft at 2:30AM Aug 15, 2020Observed: 3.93 ft at 2:45AM Aug 15, 2020Observed: 3.93 ft at 3:00AM Aug 15, 2020Observed: 3.92 ft at 3:15AM Aug 15, 2020Observed: 3.92 ft at 3:30AM Aug 15, 2020Observed: 3.9 ft at 3:45AM Aug 15, 2020Observed: 3.89 ft at 4:00AM Aug 15, 2020Observed: 3.89 ft at 4:15AM Aug 15, 2020Observed: 3.88 ft at 4:30AM Aug 15, 2020Observed: 3.87 ft at 4:45AM Aug 15, 2020Observed: 3.86 ft at 5:00AM Aug 15, 2020Observed: 3.86 ft at 5:15AM Aug 15, 2020Observed: 3.85 ft at 5:30AM Aug 15, 2020Observed: 3.84 ft at 5:45AM Aug 15, 2020Observed: 3.83 ft at 6:00AM Aug 15, 2020Observed: 3.83 ft at 6:15AM Aug 15, 2020Observed: 3.82 ft at 6:30AM Aug 15, 2020Observed: 3.81 ft at 6:45AM Aug 15, 2020Observed: 3.8 ft at 7:00AM Aug 15, 2020Observed: 3.8 ft at 7:15AM Aug 15, 2020Observed: 3.79 ft at 7:30AM Aug 15, 2020Observed: 3.78 ft at 7:45AM Aug 15, 2020Observed: 3.78 ft at 8:00AM Aug 15, 2020Observed: 3.77 ft at 8:15AM Aug 15, 2020Observed: 3.76 ft at 8:30AM Aug 15, 2020Observed: 3.76 ft at 8:45AM Aug 15, 2020Observed: 3.75 ft at 9:00AM Aug 15, 2020Observed: 3.74 ft at 9:15AM Aug 15, 2020Observed: 3.74 ft at 9:30AM Aug 15, 2020Observed: 3.73 ft at 9:45AM Aug 15, 2020Observed: 3.73 ft at 10:00AM Aug 15, 2020Observed: 3.72 ft at 10:15AM Aug 15, 2020Observed: 3.71 ft at 10:30AM Aug 15, 2020Observed: 3.71 ft at 10:45AM Aug 15, 2020Observed: 3.7 ft at 11:00AM Aug 15, 2020Observed: 3.69 ft at 11:15AM Aug 15, 2020Observed: 3.69 ft at 11:30AM Aug 15, 2020Observed: 3.68 ft at 11:45AM Aug 15, 2020Observed: 3.68 ft at 12:00PM Aug 15, 2020Observed: 3.67 ft at 12:15PM Aug 15, 2020Observed: 3.66 ft at 12:30PM Aug 15, 2020Observed: 3.66 ft at 12:45PM Aug 15, 2020Observed: 3.66 ft at 1:00PM Aug 15, 2020Observed: 3.64 ft at 1:15PM Aug 15, 2020Observed: 3.64 ft at 1:30PM Aug 15, 2020Observed: 3.63 ft at 1:45PM Aug 15, 2020Observed: 3.63 ft at 2:00PM Aug 15, 2020Observed: 3.62 ft at 2:15PM Aug 15, 2020Observed: 3.62 ft at 2:30PM Aug 15, 2020Observed: 3.61 ft at 2:45PM Aug 15, 2020Observed: 3.61 ft at 3:00PM Aug 15, 2020Observed: 3.6 ft at 3:15PM Aug 15, 2020Observed: 3.6 ft at 3:30PM Aug 15, 2020Observed: 3.6 ft at 3:45PM Aug 15, 2020USGS--Water Resources of the United StatesGTNN4(plotting HGIRG) Graph Created (4:48PM Aug 15, 2020)ObservedLatest observed value: 3.6 ft at 3:45 PM EDT 15-Aug-2020. Flood Stage is 10 ft
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About this graph
Tabular Data (UTC)
Tabular Data (EDT)
XML Data
RSS Files
Datum: NGVD29
Metadata
NOTE: Forecasts are not available for the Millstone River at Griggstown. Only observed stages are available for this point.
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Downstream Gauge Downstream Gauge - at Blackwells Mills
Flood Categories (in feet)
Major Flood Stage: 15
Moderate Flood Stage: 12
Flood Stage: 10
Action Stage: 9.5
Low Stage (in feet): 0

Historic Crests
(1) 24.21 ft on 08/28/2011
(2) 23.20 ft on 09/16/1999
(3) 22.70 ft on 08/28/1971
(4) 22.16 ft on 04/16/2007
(5) 19.00 ft on 09/22/1938
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 10.13 ft on 01/26/2020 (P)
(2) 15.50 ft on 11/25/2018
(3) 11.07 ft on 11/17/2018
(4) 10.08 ft on 11/14/2018
(5) 11.79 ft on 09/29/2018
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.

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
15 River Road flooding expands. The road closes between Grist Mill Drive and the Millstone Causway. Canal Road in Franklin Township floods.
12 River Road flooding expands near the Griggstown Causeway and begins south of Dead Tree Run Road.
10 River Road in Montgomery Township begins to flood near the Griggstown Causeway.
9.5 Griggstown Causeway is closed.
About This Location Collapse

Latitude: 40.440000° N, Longitude: 74.617500° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 10 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 26.52 36.52 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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