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 Boston / Norton, MA

Northeast River Forecast Center

Flood Warning

Hydrograph

River at a Glance

Download

Auto Refresh: OFF

Printable Image About this graph Tabular Data (UTC) Tabular Data (EST) Datum: Not Available Metadata

NOTE: Coastal flood impacts are dependent upon waves as well as tide level. High waves can result in flooding even if the tide level is below flood stage. NOTE: Forecasts for the Boston Harbor at Boston are issued routinely year-round. Vertical Datum references a tidal datum...for more information see Tides and Currents .

Default Hydrograph Scale to Flood Categories   Return to Area Map

Flood Categories (in feet) Major Flood Stage: 16 Moderate Flood Stage: 14.5 Flood Stage: 12.5 Action Stage: 11.5 Low Stage (in feet): -9999 Historic Crests (1) 15.16 ft on 01/04/2018 (2) 15.10 ft on 02/07/1978 (3) 14.67 ft on 03/02/2018 (4) 14.20 ft on 01/02/1987 (5) 14.14 ft on 10/30/1991 (6) 14.04 ft on 01/24/1979 (7) 14.03 ft on 12/12/1992 (8) 13.87 ft on 03/03/2018 (9) 13.84 ft on 12/29/1959 (10) 13.84 ft on 01/03/2014 Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 12.54 ft on 09/10/2018 (2) 13.87 ft on 03/03/2018 (3) 14.67 ft on 03/02/2018 (4) 13.24 ft on 01/30/2018 (5) 15.16 ft on 01/04/2018 (6) 13.10 ft on 05/28/2017 (7) 13.41 ft on 05/26/2017 (8) 13.62 ft on 01/27/2015 (9) 13.84 ft on 01/03/2014 (10) 13.58 ft on 06/05/2012 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: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	This is a degree of flooding rarely seen. Major widespread coastal flooding is expected. Numerous homes and roadways will be flooded from Revere and Winthrop southward thru Hull, including major flooding within the Boston Seaport District. Impacts will occur during several hours before and after high tide. People living in vulnerable coastal areas must take action to protect life and property.
14.5	Significant flooding of low lying coastal locations is expected from Revere and Winthrop southward through Hull. This includes significant flooding within the Seaport District of Boston. Numerous homes will be flooded. Road closures and evacuations of coastal sections are likely. Large swells and wave action will produce significant beach erosion.
14	Flooding of low lying coastal locations is expected from Revere and Winthrop southward through Hull. Road closures and some evacuations of coastal sections may be required. Large swells and wave action will produce minor to moderate beach erosion.
13.5	Minor flooding of low lying coastal locations is expected from Revere and Winthrop southward through Hull. The combination of high tides and large swells will result in washover onto coastal roadways and some road closures may occur around the time of high tide.
12.5	Minor coastal flooding occurs along Morrissey Boulevard in Boston.
Photos (1) Boston Harbor Tidal Station

About This Location

Latitude: 42.353900° N, Longitude: 71.050300° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 12.5 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 -5.51 6.99 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 -5.21 7.29 Older USGS topographic maps, MSL benchmarks Other Not Available 12.5 MLLW (Mean Lower Low Water)

Additional Information

**Coastal flooding can occur at a stage of 12 feet, when onshore winds are present along with 20 foot seas.** Boston Harbor gage data and forecasts are in feet Mean Lower Low Water (MLLW).

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 Boston / Norton Weather Forecast Office 46 Commerce Way Norton, MA 02766 (508) 622-3250 Ask Questions/Webmaster Page last modified: 21-Dec-2016 5:21 PM Disclaimer Credits Glossary Privacy Policy About Us Career Opportunities