Web Portal Changes:

• Attention: Technicians are currently working to bring Precipitation datasets back to full capability after the April 16 outage.
• NWPS - water.noaa.gov - Officially operational on Wednesday, March 27th, 8-9am EDT
• AHPS - water.weather.gov- Scheduled operations ends on Tuesday, May 28th, 2024 - the pages will automatically redirect to water.noaa.gov until May 28, 2025.
• Other Important URL changes - Service Change Notice 24-29 

Please visit https://www.weather.gov/owp/operations for more information.

Weather Forecast Office Philadelphia/Mount Holly, NJ

Middle Atlantic River Forecast Center

Hydrograph

River at a Glance

Download

Auto Refresh: OFF

Printable Image About this graph Tabular Data (UTC) Tabular Data (EDT) Datum: NGVD29 Metadata

NOTE: Forecasts are not available for the Stony Brook at Princeton. Only observed stages are available for this point.

Default Hydrograph Scale to Flood Categories   Return to Area Map

Flood Categories (in feet) Major Flood Stage: 14 Moderate Flood Stage: 11 Flood Stage: 9 Action Stage: 8 Low Stage (in feet): 0 Historic Crests (1) 16.23 ft on 08/28/2011 (2) 14.26 ft on 08/28/1971 (3) 14.02 ft on 09/16/1999 (4) 12.48 ft on 08/22/2021 (5) 12.27 ft on 01/19/1996 Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 10.34 ft on 01/10/2024 (2) 10.70 ft on 12/18/2023 (3) 12.48 ft on 08/22/2021 (4) 10.36 ft on 11/25/2018 (5) 11.83 ft on 05/27/2018 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

If you notice any errors in the below information, please contact our Webmaster
16	Significant flooding occurs along the brook. Several feet of water cover the Hun athletic fields. Route 206 is closed. Flooding along the brook can worsen if the Delaware and Raritan Canal is also running high.
13	The Hun School athletic fields flood. Flooding along the brook can worsen if the Delaware and Raritan Canal is also running high.
11	Mercer Street, between Province Line Road and the Stony Brook Bridge, is subject to closure due to flooding.
9	Quaker Road floods and it subject to closure. Mercer Street begins to flood.
8	Adjacent floodplain begins to flood including the Stony Brook walking trail.

About This Location

Latitude: 40.333056° N, Longitude: 74.681944° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 9 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 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps NGVD 29 62.23 71.23 Older USGS topographic maps, NGVD29 benchmarks MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks Other Not Available Not Available   Current/Historical Observations: U.S. Geological Survey (USGS) Data and Site Info for Princeton

Additional Information

During winter months, cold and ice may result in inaccurate real-time stream stage and streamflow data. 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

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: 2-Nov-2020 7:30 PM Disclaimer Credits Glossary Privacy Policy About Us Career Opportunities