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Local weather forecast by
What is AHPS?
Weather Forecast Office Philadelphia/Mount Holly, NJ
Middle Atlantic River Forecast Center
River at a Glance
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About this graph
Tabular Data (UTC)
Tabular Data (EST)
Datum: Not Available
Coastal Hazard Message
for specific information regarding Coastal Flood Watches, Warnings and Advisories. During tropical cyclones, please refer
for additional storm surge information.
NOTE: Flood impacts are based on long-term averages. Actual impacts from any tidal flooding event may vary due to factors such as rainfall, wave action, and the number of tide cycles during which there is an onshore flow.
Forecasts are not available for the Delaware River at Marcus Hook (IN MLLW). Only observed stages are available for this point.
Vertical Datum references a tidal datum (MLLW)...for more information see
Tides and Currents
Scale to Flood Categories
Return to Area Map
Flood Categories (in feet)
Major Flood Stage:
Moderate Flood Stage:
Low Stage (in feet):
(1) 10.14 ft on 10/30/2012
(2) 9.76 ft on 04/16/2011
(3) 9.75 ft on 12/21/2012
(4) 9.72 ft on 10/29/2021
(5) 9.24 ft on 09/10/2018
Show More Historic Crests
: Preliminary values subject to further review.
(1) 9.72 ft on 10/29/2021
(2) 8.76 ft on 11/26/2018
(3) 9.24 ft on 09/10/2018
(4) 9.11 ft on 05/01/2014
(5) 9.75 ft on 12/21/2012
Show More Recent Crests
: Preliminary values subject to further review.
Low Water Records
(1) -3.52 ft on 03/06/2007
(2) -3.41 ft on 01/15/2006
(3) -3.31 ft on 02/15/2015
(4) -3.27 ft on 01/06/2018
(5) -3.05 ft on 01/03/2010
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
If you notice any errors in the below information, please contact our
(Mean Lower Low Water (MLLW)) The level reached on October 30, 2012 during Post Tropical Cyclone Sandy.
(MLLW) The level reached on April 16, 2011.
(MLLW) The level reached on December 21, 2012.
(MLLW) The level reached on October 29, 2021.
(MLLW) MAJOR FLOODING. At this level, widespread roadway flooding begins near the river and its tidal tributaries in Delaware County, Pennsylvania and Gloucester County, New Jersey. Vulnerable homes and businesses may be damaged as water levels rise further above this threshold. Numerous roads become impassable and some neighborhoods may be isolated. The flood waters become a danger to anyone who attempts to cross on foot or in a vehicle.
(MLLW) MODERATE FLOODING. At this level, additional roadways near the river and its tidal tributaries in Delaware County, Pennsylvania and Gloucester County, New Jersey begin to flood. Lives may be at risk when people put themselves in harm's way. Some damage to vulnerable structures may begin to occur. COASTAL FLOOD WARNING LEVEL.
(MLLW) Flooding begins in Tinicum Township PA between Philadelphia International Airport and Essington, and along the lower Darby Creek.
(MLLW) Flooding begins along the Nehonsey Brook in Gibbstown (Greenwich Township) NJ at South Poplar Street and Democrat Road.
(MLLW) Flooding begins along Mantua Creek in Gloucester County NJ. Flooding begins along Island Road, High Hill Road, Center Square Road and Pedricktown Road in Logan Township NJ. Flooding begins along US 130 at Oldmans Creek.
(MLLW) COASTAL FLOOD ADVISORY LEVEL.
(MLLW) The Repaupo Creek overflows onto Flood Gates Road in Greenwich Township and Logan Township NJ.
(MLLW) MINOR FLOODING.
About This Location
Latitude: 39.810600° N, Longitude: 75.400900° W, Horizontal Datum: NAD83/WGS84
Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
(gauge height = 0)
(gauge height = flood stage)
Elevation information source
Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
Older USGS topographic maps, NGVD29 benchmarks
Older USGS topographic maps, MSL benchmarks
NAVD88 to MHHW conversion from NOAA Vertical Datum Transformation (VDatum)
All gage data is referenced in MLLW. During winter months, cold and ice may result in inaccurate real-time stages. Adjustments or deletions of this data can only be done after detailed analysis.
River Forecast Centers
River Stage Summary
Automated Flood Warning Systems
Inundation Mapping Locations
NWS Precipitation and River Forecasting
AHPS Iframes for Developers
Mobile iNWS for emergency management
Ensemble River Forecasts
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
National Weather Service
Philadelphia/Mount Holly Weather Forecast Office
732 Woodlane Road
Mount Holly, NJ 08060-9615
Page last modified: 2-Nov-2020 7:30 PM