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 (Baltimore/Washington) Sterling, VA

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: Not Available Metadata

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. Reliability of the Forecast: Forecast data shown here are guidance values only. Please refer to your local NWS office. NOTE: Forecasts for the Northwest Branch Patapsco River at Baltimore/Fort McHenry (IN MLLW) 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: 6 Moderate Flood Stage: 4.6 Flood Stage: 3.4 Action Stage: 2.5 Low Stage (in feet): -9999 Historic Crests (1) 8.15 ft on 09/19/2003 (2) 7.69 ft on 08/23/1933 (3) 6.39 ft on 08/13/1955 (4) 5.50 ft on 10/15/1954 (5) 5.30 ft on 08/04/1915 Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 4.92 ft on 10/30/2021 (P) (2) 4.24 ft on 04/30/2020 (P) (3) 4.17 ft on 04/13/2020 (P) (4) 3.61 ft on 11/19/2019 (P) (5) 4.05 ft on 10/12/2019 (P) Show More Recent Crests (P): Preliminary values subject to further review. Low Water Records (1) -5.00 ft on 01/24/1908 (2) -4.80 ft on 01/26/1905 (3) -4.80 ft on 02/28/1906 (4) -4.74 ft on 09/19/1936 (5) -4.73 ft on 01/01/1963 Show More Low Water Records 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

If you notice any errors in the below information, please contact our Webmaster
6.5	Water approaches Caroline Street.
6	Water reaches the corner of Ann Street and Thames Street.
5.5	Water begins to cover the Pier 4 promenade on the west side and Pier 5 on the west side.
5.25	The boardwalk at Fells Point begins to flood. Water also begins to cover low spots in the promenade at the end of Broadway Street.
5	Water begins to cover the Pier 4 promenade on the east side.
4.5	The end of Ann Street begins to flood.
4.25	The concrete promenade at Fells Point begins to flood. Water also begins to cover the boardwalk at the Maritime Park water taxi stop.
3.5	Water begins to cover the promenade at the Inner Harbor at the electric boat dock west of the World Trade Center.
3	Flooding is occurring at the end of Thames Street. Water also nearly covers the promenade at the dragon boat dock in the Inner Harbor.
2	Water begins to cover the lower promenade at the Harbor Place water taxi stop.

About This Location

Latitude: 39.270000° N, Longitude: 76.580000° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 3.4 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 -0.84 2.16 Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps NGVD 29 -0.05 2.95 Older USGS topographic maps, NGVD29 benchmarks MSL -0.80 2.20 Older USGS topographic maps, MSL benchmarks Other Not Available Not Available

Additional Information

Tidal forecast guidance is now available for this location. This forecast guidance is calibrated for high tide. Low tides may be lower than this guidance indicates.

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