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Hydrograph River at a Glance Download
Assunpink Creek near Mercerville Stage (ft)Flow (kcfs)Observed: 4.41 ft at 11:45AM Aug 04, 2020Observed: 4.66 ft at 12:00PM Aug 04, 2020Observed: 4.91 ft at 12:15PM Aug 04, 2020Observed: 5.18 ft at 12:30PM Aug 04, 2020Observed: 5.36 ft at 12:45PM Aug 04, 2020Observed: 5.49 ft at 1:00PM Aug 04, 2020Observed: 5.67 ft at 1:15PM Aug 04, 2020Observed: 5.74 ft at 1:30PM Aug 04, 2020Observed: 5.8 ft at 1:45PM Aug 04, 2020Observed: 5.84 ft at 2:00PM Aug 04, 2020Observed: 5.89 ft at 2:15PM Aug 04, 2020Observed: 5.89 ft at 2:30PM Aug 04, 2020Highest Observation: 5.91 ft at 2:45PM Aug 04, 2020Observed: 5.9 ft at 3:00PM Aug 04, 2020Observed: 5.88 ft at 3:15PM Aug 04, 2020Observed: 5.84 ft at 3:30PM Aug 04, 2020Observed: 5.81 ft at 3:45PM Aug 04, 2020Observed: 5.74 ft at 4:00PM Aug 04, 2020Observed: 5.65 ft at 4:15PM Aug 04, 2020Observed: 5.56 ft at 4:30PM Aug 04, 2020Observed: 5.42 ft at 4:45PM Aug 04, 2020Observed: 5.28 ft at 5:00PM Aug 04, 2020Observed: 5.13 ft at 5:15PM Aug 04, 2020Observed: 4.96 ft at 5:30PM Aug 04, 2020Observed: 4.81 ft at 5:45PM Aug 04, 2020Observed: 4.66 ft at 6:00PM Aug 04, 2020Observed: 4.5 ft at 6:15PM Aug 04, 2020Observed: 4.37 ft at 6:30PM Aug 04, 2020Observed: 4.24 ft at 6:45PM Aug 04, 2020Observed: 4.12 ft at 7:00PM Aug 04, 2020Observed: 4 ft at 7:15PM Aug 04, 2020Observed: 3.9 ft at 7:30PM Aug 04, 2020Observed: 3.81 ft at 7:45PM Aug 04, 2020Observed: 3.73 ft at 8:00PM Aug 04, 2020Observed: 3.66 ft at 8:15PM Aug 04, 2020Observed: 3.59 ft at 8:30PM Aug 04, 2020Observed: 3.54 ft at 8:45PM Aug 04, 2020Observed: 3.49 ft at 9:00PM Aug 04, 2020Observed: 3.43 ft at 9:15PM Aug 04, 2020Observed: 3.39 ft at 9:30PM Aug 04, 2020Observed: 3.35 ft at 9:45PM Aug 04, 2020Observed: 3.32 ft at 10:00PM Aug 04, 2020Observed: 3.29 ft at 10:15PM Aug 04, 2020Observed: 3.26 ft at 10:30PM Aug 04, 2020Observed: 3.23 ft at 10:45PM Aug 04, 2020Observed: 3.2 ft at 11:00PM Aug 04, 2020Observed: 3.17 ft at 11:15PM Aug 04, 2020Observed: 3.15 ft at 11:30PM Aug 04, 2020Observed: 3.13 ft at 11:45PM Aug 04, 2020Observed: 3.12 ft at 12:00AM Aug 05, 2020Observed: 3.08 ft at 12:15AM Aug 05, 2020Observed: 3.07 ft at 12:30AM Aug 05, 2020Observed: 3.04 ft at 12:45AM Aug 05, 2020Observed: 3.03 ft at 1:00AM Aug 05, 2020Observed: 3.01 ft at 1:15AM Aug 05, 2020Observed: 3 ft at 1:30AM Aug 05, 2020Observed: 2.98 ft at 1:45AM Aug 05, 2020Observed: 2.96 ft at 2:00AM Aug 05, 2020Observed: 2.95 ft at 2:15AM Aug 05, 2020Observed: 2.93 ft at 2:30AM Aug 05, 2020Observed: 2.92 ft at 2:45AM Aug 05, 2020Observed: 2.91 ft at 3:00AM Aug 05, 2020Observed: 2.89 ft at 3:15AM Aug 05, 2020Observed: 2.87 ft at 3:30AM Aug 05, 2020Observed: 2.86 ft at 3:45AM Aug 05, 2020Observed: 2.84 ft at 4:00AM Aug 05, 2020Observed: 2.83 ft at 4:15AM Aug 05, 2020Observed: 2.82 ft at 4:30AM Aug 05, 2020Observed: 2.81 ft at 4:45AM Aug 05, 2020Observed: 2.79 ft at 5:00AM Aug 05, 2020Observed: 2.79 ft at 5:15AM Aug 05, 2020Observed: 2.78 ft at 5:30AM Aug 05, 2020Observed: 2.76 ft at 5:45AM Aug 05, 2020Observed: 2.76 ft at 6:00AM Aug 05, 2020Observed: 2.75 ft at 6:15AM Aug 05, 2020Observed: 2.72 ft at 6:30AM Aug 05, 2020Observed: 2.72 ft at 6:45AM Aug 05, 2020Observed: 2.72 ft at 7:00AM Aug 05, 2020Observed: 2.71 ft at 7:15AM Aug 05, 2020Observed: 2.72 ft at 7:30AM Aug 05, 2020Observed: 2.72 ft at 7:45AM Aug 05, 2020Observed: 2.72 ft at 8:00AM Aug 05, 2020Observed: 2.69 ft at 8:15AM Aug 05, 2020Observed: 2.71 ft at 8:30AM Aug 05, 2020Observed: 2.69 ft at 8:45AM Aug 05, 2020Observed: 2.71 ft at 9:00AM Aug 05, 2020Observed: 2.71 ft at 9:15AM Aug 05, 2020Observed: 2.7 ft at 9:30AM Aug 05, 2020Observed: 2.7 ft at 9:45AM Aug 05, 2020Observed: 2.71 ft at 10:00AM Aug 05, 2020Observed: 2.7 ft at 10:15AM Aug 05, 2020Observed: 2.69 ft at 10:30AM Aug 05, 2020Observed: 2.69 ft at 10:45AM Aug 05, 2020Observed: 2.68 ft at 11:00AM Aug 05, 2020Observed: 2.69 ft at 11:15AM Aug 05, 2020Observed: 2.68 ft at 11:30AM Aug 05, 2020Observed: 2.67 ft at 11:45AM Aug 05, 2020Observed: 2.67 ft at 12:00PM Aug 05, 2020Observed: 2.66 ft at 12:15PM Aug 05, 2020Observed: 2.67 ft at 12:30PM Aug 05, 2020Observed: 2.67 ft at 12:45PM Aug 05, 2020Observed: 2.66 ft at 1:00PM Aug 05, 2020Observed: 2.64 ft at 1:15PM Aug 05, 2020Observed: 2.63 ft at 1:30PM Aug 05, 2020Observed: 2.64 ft at 1:45PM Aug 05, 2020Observed: 2.62 ft at 2:00PM Aug 05, 2020Observed: 2.61 ft at 2:15PM Aug 05, 2020Observed: 2.6 ft at 2:30PM Aug 05, 2020Observed: 2.6 ft at 2:45PM Aug 05, 2020Observed: 2.59 ft at 3:00PM Aug 05, 2020Observed: 2.58 ft at 3:15PM Aug 05, 2020Observed: 2.57 ft at 3:30PM Aug 05, 2020Observed: 2.56 ft at 3:45PM Aug 05, 2020Observed: 2.56 ft at 4:00PM Aug 05, 2020Observed: 2.55 ft at 4:15PM Aug 05, 2020Observed: 2.54 ft at 4:30PM Aug 05, 2020Observed: 2.53 ft at 4:45PM Aug 05, 2020Observed: 2.53 ft at 5:00PM Aug 05, 2020Observed: 2.52 ft at 5:15PM Aug 05, 2020Observed: 2.51 ft at 5:30PM Aug 05, 2020Observed: 2.5 ft at 5:45PM Aug 05, 2020Observed: 2.49 ft at 6:00PM Aug 05, 2020Observed: 2.49 ft at 6:15PM Aug 05, 2020Observed: 2.48 ft at 6:30PM Aug 05, 2020Observed: 2.47 ft at 6:45PM Aug 05, 2020Observed: 2.46 ft at 7:00PM Aug 05, 2020Observed: 2.45 ft at 7:15PM Aug 05, 2020Observed: 2.45 ft at 7:30PM Aug 05, 2020Observed: 2.44 ft at 7:45PM Aug 05, 2020Observed: 2.43 ft at 8:00PM Aug 05, 2020Observed: 2.43 ft at 8:15PM Aug 05, 2020Observed: 2.42 ft at 8:30PM Aug 05, 2020Observed: 2.42 ft at 8:45PM Aug 05, 2020Observed: 2.41 ft at 9:00PM Aug 05, 2020Observed: 2.4 ft at 9:15PM Aug 05, 2020Observed: 2.39 ft at 9:30PM Aug 05, 2020Observed: 2.39 ft at 9:45PM Aug 05, 2020Observed: 2.38 ft at 10:00PM Aug 05, 2020Observed: 2.38 ft at 10:15PM Aug 05, 2020Observed: 2.38 ft at 10:30PM Aug 05, 2020Observed: 2.37 ft at 10:45PM Aug 05, 2020Observed: 2.36 ft at 11:00PM Aug 05, 2020Observed: 2.35 ft at 11:15PM Aug 05, 2020Observed: 2.34 ft at 11:30PM Aug 05, 2020Observed: 2.33 ft at 11:45PM Aug 05, 2020Observed: 2.32 ft at 12:00AM Aug 06, 2020Observed: 2.32 ft at 12:15AM Aug 06, 2020Observed: 2.31 ft at 12:30AM Aug 06, 2020Observed: 2.31 ft at 12:45AM Aug 06, 2020Observed: 2.29 ft at 1:00AM Aug 06, 2020Observed: 2.29 ft at 1:15AM Aug 06, 2020Observed: 2.27 ft at 1:30AM Aug 06, 2020Observed: 2.26 ft at 1:45AM Aug 06, 2020Observed: 2.26 ft at 2:00AM Aug 06, 2020Observed: 2.25 ft at 2:15AM Aug 06, 2020Observed: 2.23 ft at 2:30AM Aug 06, 2020Observed: 2.23 ft at 2:45AM Aug 06, 2020Observed: 2.22 ft at 3:00AM Aug 06, 2020Observed: 2.22 ft at 3:15AM Aug 06, 2020Observed: 2.2 ft at 3:30AM Aug 06, 2020Observed: 2.19 ft at 3:45AM Aug 06, 2020Observed: 2.19 ft at 4:00AM Aug 06, 2020Observed: 2.18 ft at 4:15AM Aug 06, 2020Observed: 2.17 ft at 4:30AM Aug 06, 2020Observed: 2.17 ft at 4:45AM Aug 06, 2020Observed: 2.16 ft at 5:00AM Aug 06, 2020Observed: 2.15 ft at 5:15AM Aug 06, 2020Observed: 2.14 ft at 5:30AM Aug 06, 2020Observed: 2.13 ft at 5:45AM Aug 06, 2020Observed: 2.13 ft at 6:00AM Aug 06, 2020Observed: 2.13 ft at 6:15AM Aug 06, 2020Observed: 2.11 ft at 6:30AM Aug 06, 2020Observed: 2.11 ft at 6:45AM Aug 06, 2020Observed: 2.12 ft at 7:00AM Aug 06, 2020Observed: 2.12 ft at 7:15AM Aug 06, 2020Observed: 2.1 ft at 7:30AM Aug 06, 2020Observed: 2.11 ft at 7:45AM Aug 06, 2020Observed: 2.11 ft at 8:00AM Aug 06, 2020Observed: 2.11 ft at 8:15AM Aug 06, 2020Observed: 2.11 ft at 8:30AM Aug 06, 2020Observed: 2.12 ft at 8:45AM Aug 06, 2020Observed: 2.12 ft at 9:00AM Aug 06, 2020Observed: 2.13 ft at 9:15AM Aug 06, 2020Observed: 2.14 ft at 9:30AM Aug 06, 2020Observed: 2.17 ft at 9:45AM Aug 06, 2020Observed: 2.2 ft at 10:00AM Aug 06, 2020Observed: 2.21 ft at 10:15AM Aug 06, 2020Observed: 2.23 ft at 10:30AM Aug 06, 2020Observed: 2.24 ft at 10:45AM Aug 06, 2020Observed: 2.25 ft at 11:00AM Aug 06, 2020Observed: 2.27 ft at 11:15AM Aug 06, 2020Observed: 2.28 ft at 11:30AM Aug 06, 2020Observed: 2.3 ft at 11:45AM Aug 06, 2020Observed: 2.3 ft at 12:00PM Aug 06, 2020Observed: 2.31 ft at 12:15PM Aug 06, 2020Observed: 2.33 ft at 12:30PM Aug 06, 2020Observed: 2.34 ft at 12:45PM Aug 06, 2020Observed: 2.36 ft at 1:00PM Aug 06, 2020Observed: 2.37 ft at 1:15PM Aug 06, 2020Observed: 2.37 ft at 1:30PM Aug 06, 2020Observed: 2.39 ft at 1:45PM Aug 06, 2020Observed: 2.39 ft at 2:00PM Aug 06, 2020Observed: 2.41 ft at 2:15PM Aug 06, 2020Observed: 2.41 ft at 2:30PM Aug 06, 2020Observed: 2.42 ft at 2:45PM Aug 06, 2020Observed: 2.42 ft at 3:00PM Aug 06, 2020Observed: 2.42 ft at 3:15PM Aug 06, 2020Observed: 2.41 ft at 3:30PM Aug 06, 2020Observed: 2.41 ft at 3:45PM Aug 06, 2020Observed: 2.41 ft at 4:00PM Aug 06, 2020Observed: 2.4 ft at 4:15PM Aug 06, 2020Observed: 2.39 ft at 4:30PM Aug 06, 2020Observed: 2.38 ft at 4:45PM Aug 06, 2020Observed: 2.37 ft at 5:00PM Aug 06, 2020Observed: 2.37 ft at 5:15PM Aug 06, 2020Observed: 2.36 ft at 5:30PM Aug 06, 2020Observed: 2.35 ft at 5:45PM Aug 06, 2020Observed: 2.34 ft at 6:00PM Aug 06, 2020Observed: 2.32 ft at 6:15PM Aug 06, 2020Observed: 2.31 ft at 6:30PM Aug 06, 2020Observed: 2.3 ft at 6:45PM Aug 06, 2020Observed: 2.3 ft at 7:00PM Aug 06, 2020Observed: 2.28 ft at 7:15PM Aug 06, 2020Observed: 2.28 ft at 7:30PM Aug 06, 2020Observed: 2.27 ft at 7:45PM Aug 06, 2020Observed: 2.26 ft at 8:00PM Aug 06, 2020Observed: 2.25 ft at 8:15PM Aug 06, 2020Observed: 2.25 ft at 8:30PM Aug 06, 2020Observed: 2.24 ft at 8:45PM Aug 06, 2020Observed: 2.23 ft at 9:00PM Aug 06, 2020Observed: 2.22 ft at 9:15PM Aug 06, 2020Observed: 2.22 ft at 9:30PM Aug 06, 2020Observed: 2.22 ft at 9:45PM Aug 06, 2020Observed: 2.21 ft at 10:00PM Aug 06, 2020Observed: 2.21 ft at 10:15PM Aug 06, 2020Observed: 2.2 ft at 10:30PM Aug 06, 2020Observed: 2.19 ft at 10:45PM Aug 06, 2020Observed: 2.18 ft at 11:00PM Aug 06, 2020Observed: 2.18 ft at 11:15PM Aug 06, 2020Observed: 2.17 ft at 11:30PM Aug 06, 2020Observed: 2.17 ft at 11:45PM Aug 06, 2020Observed: 2.16 ft at 12:00AM Aug 07, 2020Observed: 2.14 ft at 12:15AM Aug 07, 2020Observed: 2.14 ft at 12:30AM Aug 07, 2020Observed: 2.14 ft at 12:45AM Aug 07, 2020Observed: 2.12 ft at 1:00AM Aug 07, 2020Observed: 2.11 ft at 1:15AM Aug 07, 2020Observed: 2.11 ft at 1:30AM Aug 07, 2020Observed: 2.09 ft at 1:45AM Aug 07, 2020Observed: 2.09 ft at 2:00AM Aug 07, 2020Observed: 2.07 ft at 2:15AM Aug 07, 2020Observed: 2.07 ft at 2:30AM Aug 07, 2020Observed: 2.05 ft at 2:45AM Aug 07, 2020Observed: 2.05 ft at 3:00AM Aug 07, 2020Observed: 2.03 ft at 3:15AM Aug 07, 2020Observed: 2.02 ft at 3:30AM Aug 07, 2020Observed: 2.02 ft at 3:45AM Aug 07, 2020Observed: 2.01 ft at 4:00AM Aug 07, 2020Observed: 2.01 ft at 4:15AM Aug 07, 2020Observed: 2 ft at 4:30AM Aug 07, 2020Observed: 1.99 ft at 4:45AM Aug 07, 2020Observed: 1.99 ft at 5:00AM Aug 07, 2020Observed: 1.98 ft at 5:15AM Aug 07, 2020Observed: 1.97 ft at 5:30AM Aug 07, 2020Observed: 1.97 ft at 5:45AM Aug 07, 2020Observed: 1.97 ft at 6:00AM Aug 07, 2020Observed: 1.97 ft at 6:15AM Aug 07, 2020Observed: 1.97 ft at 6:30AM Aug 07, 2020Observed: 1.96 ft at 6:45AM Aug 07, 2020Observed: 1.96 ft at 7:00AM Aug 07, 2020Observed: 1.97 ft at 7:15AM Aug 07, 2020Observed: 1.96 ft at 7:30AM Aug 07, 2020Observed: 1.95 ft at 7:45AM Aug 07, 2020Observed: 1.96 ft at 8:00AM Aug 07, 2020Observed: 1.97 ft at 8:15AM Aug 07, 2020Observed: 1.97 ft at 8:30AM Aug 07, 2020Observed: 1.97 ft at 8:45AM Aug 07, 2020Observed: 1.97 ft at 9:00AM Aug 07, 2020Observed: 1.97 ft at 9:15AM Aug 07, 2020Observed: 1.98 ft at 9:30AM Aug 07, 2020Observed: 1.97 ft at 9:45AM Aug 07, 2020Observed: 1.99 ft at 10:00AM Aug 07, 2020Observed: 1.99 ft at 10:15AM Aug 07, 2020Observed: 1.99 ft at 10:30AM Aug 07, 2020USGS--Water Resources of the United StatesMERN4(plotting HGIRG) Graph Created (11:33AM Aug 7, 2020)ObservedLatest observed value: 1.99 ft at 10:30 AM EDT 7-Aug-2020. Flood Stage is 9.5 ft
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About this graph
Tabular Data (UTC)
Tabular Data (EDT)
XML Data
RSS Files
Datum: NAVD88
Metadata
NOTE: Forecasts are not available for the Assunpink Creek near Mercerville. Only observed stages are available for this point.
Return to Area Map
Flood Categories (in feet)
Major Flood Stage: 13
Moderate Flood Stage: 11
Flood Stage: 9.5
Action Stage: 8.5
Low Stage (in feet): -9999

Historic Crests
(1) 14.29 ft on 05/01/2014
(2) 12.86 ft on 05/27/2018
(3) 12.31 ft on 11/25/2018

(P): Preliminary values subject to further review.

Recent Crests
(1) 12.31 ft on 11/25/2018
(2) 12.86 ft on 05/27/2018
(3) 14.29 ft on 05/01/2014

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.
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
14 Flooding expands across the above mentioned areas. Roads are barricaded and closed.
13 Sweetbriar Avenue from Whitehead Road to Trinity Avenue is flooded and is subject to closures. Residential basements are flooded on Sweetbriar Avenue. The Whitehead Bridge connecting Hamilton and Lawrence is closed.
12 Assunpink Boulevard from 1st to 5th Avenue is flooded and is subject to closures. Rutgers Avenue from Sweetbriar Avenue to Trinity Avenue is flooded and is subject to closures.
11 Brown Avenue from Rutgers Avenue to Vetterlein Avenue is flooded and is subject to closures. Whitehead Road from 7th Avenue to Township Line is flooded and is subject to closures.
10 Assunpink Boulevard floods. Carnegie Road floods. Rutgers Avenue from Amhurst Avenue to the dead end floods and is subject to closures.
8.5 The Delaware and Raritan Canal State Park trail floods.
About This Location Collapse

Latitude: 40.247500° N, Longitude: 74.727778° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 9.5 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 98 107.5 Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 Not Available Not Available 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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