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: The National Hydrologic Discussion, Area Hydrologic Discussion, and Flood Hazard Outlook, and real-time geospatial services depicting River Forecast Center and National Water Model forecasts, continue to be accessible via https://www.weather.gov/owp/operations, as described in the StoryMap here.

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 Severn River at Annapolis (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: 5 Moderate Flood Stage: 3.3 Flood Stage: 2.6 Action Stage: 2 Low Stage (in feet): -9999 Historic Crests (1) 7.16 ft on 09/19/2003 (2) 6.17 ft on 08/23/1933 (3) 4.98 ft on 08/13/1955 (4) 4.90 ft on 10/30/2021 (P) (5) 4.84 ft on 09/07/1996 Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 4.90 ft on 10/30/2021 (P) (2) 3.72 ft on 04/30/2020 (P) (3) 3.56 ft on 04/13/2020 (P) (4) 3.33 ft on 04/05/2020 (P) (5) 3.43 ft on 11/19/2019 (P) Show More Recent Crests (P): Preliminary values subject to further review. Low Water Records (1) -3.86 ft on 04/05/1975 (2) -3.82 ft on 12/31/1962 (3) -3.72 ft on 02/06/1967 (4) -3.28 ft on 12/25/1980 (5) -3.09 ft on 02/09/1985 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:15 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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6	Significant flooding is occurring in the Annapolis City Dock area, and on portions of the Naval Academy campus. Numerous roads and fields are flooded, and water is in several buildings.
4.2	The boardwalk at the Annapolis City Dock is underwater. Water also affects several locations near the city dock, including portions of Compromise Street and several streets on the Naval Academy campus.
3.5	Water reaches the floor of the Maritime Museum in Annapolis and begins to cover Bowyer Road on the Naval Academy campus.
3.3	Water is likely coming up through storm drains and approaching businesses on Dock Street in Annapolis. Water approaches the Maritime Museum and begins to cover Bowyer Road at the Naval Academy.
3.2	Water coming up through storm drains approaches businesses on Dock Street in Annapolis.
3	Compromise Street begins to flood in Annapolis.
2.8	Flooding of the Dock Street parking area is possible, and water could cover much of the parking area under certain circumstances.
2.6	Water begins to cover the immediate area surrounding the Alex Haley Memorial near Annapolis City Dock. The nearby Dock Street parking area may begin to see pooled water affecting parking capacity.
2.4	Water may begin to pond in the parking lot at Annapolis City Dock.

About This Location

Latitude: 38.983056° N, Longitude: 76.480000° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 2.6 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 -0.77 1.63 Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps NGVD 29 0.06 2.46 Older USGS topographic maps, NGVD29 benchmarks MSL -0.72 1.68 Older USGS topographic maps, MSL benchmarks Other Not Available Not Available

Additional Information

Data presented here is in Mean Lower Low Water (MLLW) datum. For more information on tidal datums, visit the National Ocean Service.

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 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 (571) 888-3500 Ask Questions/Webmaster Page last modified: 2-Nov-2020 7:30 PM Disclaimer Credits Glossary Privacy Policy About Us Career Opportunities