ALERT: Update on status of the nationwide data transmission error that prevents stream gauge data collected at affected locations from being displayed on the Advanced Hydrologic Prediction Services (AHPS) webpages. The USGS has restored the transmission from all of their gauges or has placed them in a seasonal outage (some Alaska gauges). There are a few USGS gauges that the NWS is not yet receiving the new transmissions and NWS is working to get that data by alternate means. A map of the status of USGS gauges is here. The status map of gauge outages from other agencies is here. The situation has greatly improved and will continue to improve but at a slower pace. The outage maps will now be updated once per week on Thursday. We apologize for the service interruption and hope to have the data restored as soon as possible.

Weather Forecast Office Philadelphia/Mount Holly, NJ

Middle Atlantic River Forecast Center

Hydrograph

River at a Glance

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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: Graphical forecasts are not available for the Christina River at Wilmington. During times of high water, forecast crest information can be found in the text products. 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: 9.4 Moderate Flood Stage: 8.4 Flood Stage: 7.4 Action Stage: 0 Low Stage (in feet): -2 Historic Crests (1) 9.91 ft on 10/30/2012 (2) 9.40 ft on 12/21/2012 (3) 9.34 ft on 04/16/2011 (4) 8.80 ft on 05/01/2014 (5) 8.72 ft on 08/27/2011 Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 8.57 ft on 04/16/2018 (2) 8.80 ft on 05/01/2014 (3) 9.40 ft on 12/21/2012 (4) 9.91 ft on 10/30/2012 (5) 8.72 ft on 08/27/2011 Show More Recent Crests (P): Preliminary values subject to further review. Low Water Records (1) -3.76 ft on 03/02/2018 (2) -3.48 ft on 01/07/2018 (3) -3.24 ft on 04/03/2016

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

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9.91	The level reached on October 30, 2012 during Post Tropical Cyclone Sandy.
9.4	MAJOR FLOODING. At this level, widespread roadway flooding begins near the Christina River and its tidal tributaries in Wilmington. 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 water becomes a danger to anyone who attempts to cross on foot or in a vehicle.
8.4	MODERATE FLOODING. At this level, additional roadways near the Christina River and its tidal tributaries in Wilmington 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	Flooding from the Brandywine Creek begins along East 12th Street in Wilmington. Flooding begins along the south bank of the Christina River in Wilmington.
7.7	COASTAL FLOOD ADVISORY LEVEL.
7.4	MINOR FLOODING.

About This Location

Latitude: 39.736111° N, Longitude: 75.540556° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 7.4 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 -2.75 4.65 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 -3.14 1.51 NAVD88 to MHHW conversion from NOAA Vertical Datum Transformation (VDatum) Current/Historical Observations: U.S. Geological Survey (USGS) Data and Site Info for Wilmington

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.

Resources

Hydrologic Resources Text Products Past Precipitation Forecast Precipitation River Forecast Centers River Stage Summary Automated Flood Warning Systems Inundation Mapping Locations

Additional Resources Area Hydrographs NWS Precipitation and River Forecasting AHPS Iframes for Developers Mobile iNWS for emergency management Flood Damage Costs/Fatalities in the US, 1903 - 2014 AHPS Web Brochure Snow Information Ensemble River Forecasts Hourly Precipitation

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 Ask Questions/Webmaster Page last modified: 21-Dec-2016 5:21 PM Disclaimer Credits Glossary Privacy Policy About Us Career Opportunities