Web Portal Changes: The Advanced Hydrologic Prediction Service (AHPS) hosted at https://water.weather.gov will be replaced by the National Water Prediction Service (NWPS), with a target of March 2024. Existing AHPS content and features will be preserved and expanded within NWPS.

Experimental National Water Center Products: Flood Inundation Mapping services are now available for 10% of the U.S. population. Please visit https://www.weather.gov/owp/operations for more information. The National Hydrologic Discussion, Area Hydrologic Discussion, Flood Hazard Outlook, and real-time geospatial services depicting River Forecast Center and National Water Model forecasts, continue to be accessible via the URL above, as described in the StoryMap here.

Weather Forecast Office Boston / Norton, MA

Northeast 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. Actual impacts from any coastal 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 (go to the web site and select the storm of interest) reflects a reasonable worst case scenario. The forecast above is the total water forecast that is most likely to occur. NOTE: Forecasts for the Massachusetts Bay at Scituate (IN MLLW) are issued routinely year-round. Vertical Datum references a tidal datum...for more information see Tides and Currents .

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Flood Categories (in feet) Major Flood Stage: 15.5 Moderate Flood Stage: 13.5 Flood Stage: 11.5 Action Stage: 11 Low Stage (in feet): -9999 Historic Crests (1) 14.78 ft on 01/04/2018 (2) 14.59 ft on 03/03/2018 (3) 14.36 ft on 03/02/2018 (4) 13.84 ft on 01/30/2018 (5) 13.07 ft on 01/12/2012 (6) 13.02 ft on 01/02/2010 (7) 12.96 ft on 03/01/2010 (8) 12.96 ft on 03/04/2010 (9) 12.81 ft on 01/21/2011 (10) 12.79 ft on 12/23/2022 (P) Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 11.56 ft on 01/20/2023 (P) (2) 12.79 ft on 12/23/2022 (P) (3) 11.55 ft on 05/17/2022 (P) (4) 11.68 ft on 10/27/2021 (P) (5) 12.25 ft on 02/02/2021 (P) (6) 11.93 ft on 02/02/2021 (P) (7) 11.57 ft on 01/16/2021 (P) (8) 11.74 ft on 12/14/2020 (P) (9) 11.55 ft on 04/21/2019 (10) 11.64 ft on 04/19/2019 Show More Recent Crests (P): Preliminary values subject to further review. Low Water Records Currently none available. For more information on your flood risk go to www.floodsmart.gov. Show FEMA's National Flood Hazard Layers FEMA's National Flood Hazard Layers not showing? Why aren't the FEMA National Flood Hazard Layers showing on the ESRI Map? Possible reasons: There are no FEMA National Flood Hazard Layers for the location which you are viewing on ESRI Maps. The FEMA Web Mapping Service (WMS) is down. Note: Your zoom level may have changed. ESRI's zoom levels must be between 14 and 16 to show National Flood Hazard layers.

Zoom Level:14 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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14	Widespread flooding of coastal areas along the south shore from Cohasset to Plymouth is expected. Large swells breaking on the coastline may produce structural damage to roads and homes near the time of high tide. Evacuations and road closures may be required. Significant beach erosion is also expected.
13.5	Significant flooding of coastal areas along the South Shore from Cohasset to Plymouth is expected. Large swells breaking on the coastline may damage some immediate coastal roads and homes near the time of high tide. Evacuations and road closures may be required. Significant beach erosion is also likely.
13	Flooding is expected in low lying areas of Cohasset, Scituate and Marshfield. Some localized evaucations may be required as coastal roads become inundated. Large waves will produce beach erosion.
12.5	Minor flooding and beach erosion is expected across low lying sections of Cohasset, Scituate and Marshfield. Immediate coastal roads may be impassable for a time nearest the time of high tide.

About This Location

Latitude: 42.199444° N, Longitude: 70.720000° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 11.5 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 Not Available Not Available Older USGS topographic maps, NGVD29 benchmarks MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks Other 0.00 11.5 Mean Lower Low Water (MLLW)

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 Boston / Norton Weather Forecast Office 46 Commerce Way Norton, MA 02766 (508) 622-3250 Ask Questions/Webmaster Page last modified: 2-Nov-2020 7:30 PM Disclaimer Credits Glossary Privacy Policy About Us Career Opportunities