ALERT: November 15 update on the status of the nationwide data transmission error preventing stream gauge data collected at affected locations from being displayed on the Advanced Hydrologic Prediction Services (AHPS) webpages. As of 11/08/2018, The USGS has restored all impacted operational stream gauges to transmitting status. The status map of gauge outages from other agencies is here. The outage map will be updated each 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. 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 Cape May Harbor at Cape May Harbor are issued routinely year-round. 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: 8.2 Moderate Flood Stage: 7.2 Flood Stage: 6.2 Action Stage: 0 Low Stage (in feet): -2 Historic Crests (1) 9.36 ft on 01/23/2016 (2) 8.67 ft on 10/29/2012 (3) 7.92 ft on 08/27/2011 (4) 7.78 ft on 10/02/2015 (5) 7.74 ft on 09/26/2000 Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 7.29 ft on 09/19/2017 (2) 7.41 ft on 05/25/2017 (3) 7.57 ft on 02/09/2016 (4) 9.36 ft on 01/23/2016 (5) 7.31 ft on 01/10/2016 Show More Recent Crests (P): Preliminary values subject to further review. Low Water Records (1) -3.02 ft on 01/06/2018

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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9.36	The level reached on January 23, 2016.
8.67	The level reached on October 29, 2012 during Post Tropical Cyclone Sandy.
8.2	MAJOR FLOODING. At this level, flooding starts to become severe enough to begin causing structural damage along with widespread flooding of roadways in Wildwood Crest, Cape May and West Cape May. Vulnerable homes and businesses may be severely 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.
7.2	MODERATE FLOODING. At this level, widespread flooding of roadways begins due to high water and/or wave action with many roads becoming impassable in Wildwood Crest, Cape May and West Cape May. 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	Flooding begins on the access roads to the Ocean Drive bridge between Wildwood Crest and Cape May (Cape May County Route 621). Flooding begins along Beach Avenue and New Jersey Avenue in Cape May. Flooding begins around the Leaming Avenue-Elmira Street bridge between West Cape May and Cape May.
6.8	Flooding begins along Park Boulevard in Wildwood Crest. Flooding begins around Yacht Avenue in Cape May.
6.5	COASTAL FLOOD ADVISORY LEVEL.
6.2	MINOR FLOODING.

About This Location

Latitude: 38.948611° N, Longitude: 74.890278° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 6.2 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 -2.77 3.43 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 -2.30 1.13 NAVD88 to MHHW conversion from NOAA Vertical Datum Transformation (VDatum) Current/Historical Observations: U.S. Geological Survey (USGS) Data and Site Info for Cape May Harbor

Additional Information

All gage data has been converted to MLLW following the National Ocean Service protocal. Gage data displayed on the USGS website is in NAVD88. 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 10:38 PM Disclaimer Credits Glossary Privacy Policy About Us Career Opportunities