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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 Newport (IN MLLW). 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: 9.2 Moderate Flood Stage: 8.2 Flood Stage: 7.2 Action Stage: 0 Low Stage (in feet): -2 Historic Crests (1) 10.11 ft on 10/30/2012 (2) 9.77 ft on 09/17/1999 (3) 9.36 ft on 05/01/2014 (4) 9.22 ft on 10/29/2021 (5) 9.11 ft on 08/28/2011 Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 9.22 ft on 10/29/2021 (2) 8.30 ft on 09/01/2021 (3) 8.28 ft on 08/04/2020 (4) 8.88 ft on 09/10/2018 (5) 9.36 ft on 05/01/2014 Show More Recent Crests (P): Preliminary values subject to further review. Low Water Records Currently none available.

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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10.11	(Mean Lower Low Water (MLLW)) The level reached on October 30, 2012 during Post Tropical Cyclone Sandy.
9.77	(MLLW) The level reached on September 17, 1999 during Hurricane Floyd.
9.36	(MLLW) The level reached on May 1, 2014.
9.22	(MLLW) The level reached on October 29, 2021.
9.2	(MLLW) MAJOR FLOODING. At this level, widespread roadway flooding begins near the Christina River and its tidal tributaries from Christiana to Newport. 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.
8.2	(MLLW) MODERATE FLOODING. At this level, additional roadways near the Christina River and its tidal tributaries from Christiana to Newport 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.
7.8	(MLLW) Flooding begins along the Christina River from Christiana to Newport. Flooding begins along the lower reaches of the White Clay Creek and the Red Clay Creek (around Stanton and Glenville) where they merge to enter the Christina River.
7.5	(MLLW) COASTAL FLOOD ADVISORY LEVEL.
7.2	(MLLW) MINOR FLOODING.

About This Location

Latitude: 39.710556° N, Longitude: 75.608611° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 7.2 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 4.45 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 1.31 NAVD88 to MHHW conversion from NOAA Vertical Datum Transformation (VDatum) Current/Historical Observations: U.S. Geological Survey (USGS) Data and Site Info for Newport (IN MLLW)

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 Inundation Mapping Locations

Additional Resources Area Hydrographs NWS Precipitation and River Forecasting AHPS Iframes for Developers Mobile iNWS for emergency management Snow Information Ensemble River Forecasts Hourly Precipitation

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