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 (Baltimore/Washington) Sterling, VA

Middle Atlantic River Forecast Center

Hydrograph

River at a Glance

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NOTE:  Please refer to Coastal Flood Advisories and Warnings for official water level forecasts during periods of coastal flooding.  During tropical cyclones, please refer here for additional storm surge information. NOTE: Forecasts for the St. George Creek at Straits Point 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: 5 Moderate Flood Stage: 3.5 Flood Stage: 3 Action Stage: 2.5 Low Stage (in feet): -9999 Historic Crests (1) 4.56 ft on 09/10/2018 (2) 4.39 ft on 03/07/2018 (3) 4.30 ft on 09/09/2018 (4) 4.25 ft on 10/05/2015 (5) 3.98 ft on 02/09/2016 Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 4.56 ft on 09/10/2018 (2) 4.30 ft on 09/09/2018 (3) 3.65 ft on 07/22/2018 (4) 3.52 ft on 04/16/2018 (5) 4.39 ft on 03/07/2018 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

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5	Significant and widespread inundation is occurring along the lower Tidal Potomac and adjacent tidal tributaries. Numerous roads and structures are affected.
3.5	Water covers roads on St. Georges Island, is in yards, and approaching structures. To the east, inundation is occurring at multiple marinas off St. Mary's River, Smith Creek, and Jutland Creek.
3	Yards are flooded on Saint George Island, and water will begin covering the road leading to the island, especially if there is wave action.
2.7	Water begins to go over a portion of the bulkhead near the Straits Point bridge, and also covers yards in the St Georges Creek and St Marys River areas.

About This Location

Latitude: 38.138333° N, Longitude: 76.500000° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 3 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 Not Available 2.7 MLLW

Additional Information

Tidal forecast guidance is now available for this location.

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 (Baltimore/Washington) Sterling Weather Forecast Office 43858 Weather Service Rd. Sterling, VA 20166 (703) 996-2200 Ask Questions/Webmaster Page last modified: 21-Dec-2016 5:21 PM Disclaimer Credits Glossary Privacy Policy About Us Career Opportunities