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Hydrograph River at a Glance Download
Delaware River at Marcus Hook (IN MLLW) Stage (ft)National Ocean and Coastal AgencyMRCP1(plotting HMIRP) Graph Created (9:33PM Sep 28, 2022)Flood Stage is 7.7 ft
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Datum: Not Available
Metadata
NOTE: Please refer to our Coastal Hazard Message for specific information regarding Coastal Flood Watches, Warnings and Advisories.  During tropical cyclones, please refer here 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.

NOTE: 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 .

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Flood Categories (in feet)
Major Flood Stage: 9.7
Moderate Flood Stage: 8.7
Flood Stage: 7.7
Action Stage: 0
Low Stage (in feet): -2

Historic Crests
(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

(P): Preliminary values subject to further review.

Recent Crests
(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

(P): 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
Zoom Level:16
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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
10.14 (Mean Lower Low Water (MLLW)) The level reached on October 30, 2012 during Post Tropical Cyclone Sandy.
9.76 (MLLW) The level reached on April 16, 2011.
9.75 (MLLW) The level reached on December 21, 2012.
9.72 (MLLW) The level reached on October 29, 2021.
9.7 (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.
8.7 (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.
8.5 (MLLW) Flooding begins in Tinicum Township PA between Philadelphia International Airport and Essington, and along the lower Darby Creek.
8.3 (MLLW) Flooding begins along the Nehonsey Brook in Gibbstown (Greenwich Township) NJ at South Poplar Street and Democrat Road.
8.1 (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.
8 (MLLW) COASTAL FLOOD ADVISORY LEVEL.
7.9 (MLLW) The Repaupo Creek overflows onto Flood Gates Road in Greenwich Township and Logan Township NJ.
7.7 (MLLW) MINOR FLOODING.
About This Location Collapse

Latitude: 39.810600° N, Longitude: 75.400900° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 7.7 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 -2.92 4.78 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 -3.11 1.67 NAVD88 to MHHW conversion from NOAA Vertical Datum Transformation (VDatum)
Additional Information Collapse
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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Hydrologic Resources Additional Resources
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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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