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Hydrograph
Weather Forecast Office Philadelphia/Mount Holly, NJ
Middle Atlantic River Forecast Center
Hydrograph
River at a Glance
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About this graph
Tabular Data (UTC)
Tabular Data (EST)
Datum: Not Available
Metadata
NOTE:
Please refer to our
Coastal Hazard Message
for specific information regarding Coastal Flood Watches, Warnings and Advisories. 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. During tropical cyclones, please refer
here
for additional storm surge information.
NOTE: During a Tropical Storm or Hurricane Watch or Warning, inundation mapping provided by the
National Hurricane Center
reflects a plausible worst case scenario. The experimental forecast above is the total water forecast that is expected to occur.
NOTE:
Forecasts for the Delaware River at Burlington (IN MLLW) are issued routinely year-round.
Vertical Datum references a tidal datum (MLLW)...for more information see
Tides and Currents
.
Default Hydrograph
Scale to Flood Categories
Return to Area Map
Upstream Gauge
Downstream Gauge
Flood Categories (in feet)
Major Flood Stage:
11.3
Moderate Flood Stage:
10.3
Flood Stage:
9.3
Action Stage:
0
Low Stage (in feet):
-2
Historic Crests
(1) 11.94 ft on 04/17/2011
(2) 11.69 ft on 10/30/2012
(3) 11.61 ft on 12/21/2012
(4) 11.58 ft on 05/01/2014
(5) 11.28 ft on 08/28/2011
Show More Historic Crests
(P)
: Preliminary values subject to further review.
Recent Crests
(1) 10.65 ft on 08/04/2020
(2) 10.60 ft on 11/26/2018
(3) 10.62 ft on 09/10/2018
(4) 10.58 ft on 04/16/2018
(5) 11.58 ft on 05/01/2014
Show More Recent Crests
(P)
: Preliminary values subject to further review.
Low Water Records
(1) -3.51 ft on 02/15/2015
(2) -3.29 ft on 04/03/2016
(3) -3.16 ft on 01/07/2018
(4) -3.04 ft on 01/04/2010
Zoom Level:16
Legend
FEMA Layer
Gauge Location
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
If you notice any errors in the below information, please contact our
Webmaster
11.94
(Mean Lower Low Water (MLLW)) The level reached on April 17, 2011.
11.69
(MLLW) The level reached on October 30, 2012 during Post Tropical Cyclone Sandy.
11.61
(MLLW) The level reached on December 21, 2012.
11.58
(MLLW) The level reached on May 1, 2014.
11.3
(MLLW) MAJOR FLOODING. At this level, widespread roadway flooding begins near the river and its tidal tributaries in Burlington County, lower Bucks County and Northeast Philadelphia. 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.
10.3
(MLLW) MODERATE FLOODING. At this level, additional roadways near the river and its tidal tributaries in Burlington County, lower Bucks County and Northeast Philadelphia 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.
9.9
(MLLW) Flooding begins around Radcliffe Street and Mill Street in Bristol PA. Flooding begins along Tanner's Run near the intersection of US Route 130, Beverly Road and Devlin Avenue in Burlington Township NJ. Flooding begins on the lower Rancocas Creek and its tributaries including Kendles Run and Parkers Creek near Creek Road in Moorestown NJ.
9.7
(MLLW) Flooding begins along the riverfront in Burlington City NJ. Flooding begins in Delanco NJ along Delaware Avenue and on the access road to the Riverside Bridge (Burlington Avenue). Flooding begins in Beverly, Riverside and Delran NJ. Flooding begins around Kern Street, Zeisner Avenue and River Road in Cinnaminson NJ. Flooding begins along the Pompeston Creek in Cinnaminson and Riverton NJ.
9.6
(MLLW) COASTAL FLOOD ADVISORY LEVEL.
9.5
(MLLW) Flooding begins near the mouth of the Neshaminy Creek in the Croydon section of Bristol Township including Sixth Avenue, River Road, Minot Avenue and Bank Street. Flooding begins around the large parking lot at the east end of Linden Avenue in Northeast Philadelphia.
9.3
(MLLW) MINOR FLOODING.
About This Location
Latitude: 40.081459° N, Longitude: 74.869447° W, Horizontal Datum: NAD83/WGS84
River Stage
Reference Frame
Gauge Height
Flood Stage
Uses
NWS stage
0 ft
9.3 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
-3.33
5.97
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
-4.40
1.57
NAVD88 to MHHW conversion from NOAA Vertical Datum Transformation (VDatum)
Additional Information
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.
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Collaborative Agencies
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: 30-Oct-2020 4:10 PM
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