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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 Spring 2024. Existing AHPS content and features will be preserved and expanded within NWPS. The NWS is now accepting feedback on NWPS. Please visit https://www.weather.gov/owp/operations for more information.

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.



DID YOU KNOW... Please try our new TEST hydrograph page link at: https://preview.water.noaa.gov/gauges/abcde - Just replace “abcde” with your local hydrograph five character ID found in the lower left corner of the hydrograph.  In late March of 2024, the base URL path will become water.noaa.gov.  Feedback can be provided HERE
Hydrograph River at a Glance Download
Potomac River at Hancock Stage (ft)Flow (kcfs)Observed: 3.2 ft at 10:15AM Dec 06, 2023Observed: 3.2 ft at 10:30AM Dec 06, 2023Observed: 3.2 ft at 10:45AM Dec 06, 2023Observed: 3.2 ft at 11:00AM Dec 06, 2023Observed: 3.21 ft at 11:15AM Dec 06, 2023Observed: 3.21 ft at 11:30AM Dec 06, 2023Observed: 3.21 ft at 11:45AM Dec 06, 2023Observed: 3.21 ft at 12:00PM Dec 06, 2023Observed: 3.21 ft at 12:15PM Dec 06, 2023Observed: 3.21 ft at 12:30PM Dec 06, 2023Observed: 3.21 ft at 12:45PM Dec 06, 2023Observed: 3.21 ft at 1:00PM Dec 06, 2023Observed: 3.21 ft at 1:15PM Dec 06, 2023Observed: 3.21 ft at 1:30PM Dec 06, 2023Observed: 3.21 ft at 1:45PM Dec 06, 2023Observed: 3.21 ft at 2:00PM Dec 06, 2023Observed: 3.21 ft at 2:15PM Dec 06, 2023Observed: 3.21 ft at 2:30PM Dec 06, 2023Observed: 3.21 ft at 2:45PM Dec 06, 2023Observed: 3.21 ft at 3:00PM Dec 06, 2023Observed: 3.21 ft at 3:15PM Dec 06, 2023Observed: 3.21 ft at 3:30PM Dec 06, 2023Observed: 3.21 ft at 3:45PM Dec 06, 2023Observed: 3.21 ft at 4:00PM Dec 06, 2023Observed: 3.21 ft at 4:15PM Dec 06, 2023Observed: 3.21 ft at 4:30PM Dec 06, 2023Observed: 3.21 ft at 4:45PM Dec 06, 2023Observed: 3.21 ft at 5:00PM Dec 06, 2023Observed: 3.21 ft at 5:15PM Dec 06, 2023Observed: 3.21 ft at 5:30PM Dec 06, 2023Observed: 3.2 ft at 5:45PM Dec 06, 2023Observed: 3.2 ft at 6:00PM Dec 06, 2023Observed: 3.2 ft at 6:15PM Dec 06, 2023Observed: 3.2 ft at 6:30PM Dec 06, 2023Observed: 3.2 ft at 6:45PM Dec 06, 2023Observed: 3.2 ft at 7:00PM Dec 06, 2023Observed: 3.2 ft at 7:15PM Dec 06, 2023Observed: 3.2 ft at 7:30PM Dec 06, 2023Observed: 3.2 ft at 7:45PM Dec 06, 2023Observed: 3.2 ft at 8:00PM Dec 06, 2023Observed: 3.2 ft at 8:15PM Dec 06, 2023Observed: 3.2 ft at 8:30PM Dec 06, 2023Observed: 3.2 ft at 8:45PM Dec 06, 2023Observed: 3.2 ft at 9:00PM Dec 06, 2023Observed: 3.2 ft at 9:15PM Dec 06, 2023Observed: 3.2 ft at 9:30PM Dec 06, 2023Observed: 3.2 ft at 9:45PM Dec 06, 2023Observed: 3.2 ft at 10:00PM Dec 06, 2023Observed: 3.2 ft at 10:15PM Dec 06, 2023Observed: 3.2 ft at 10:30PM Dec 06, 2023Observed: 3.2 ft at 10:45PM Dec 06, 2023Observed: 3.2 ft at 11:00PM Dec 06, 2023Observed: 3.2 ft at 11:15PM Dec 06, 2023Observed: 3.2 ft at 11:30PM Dec 06, 2023Observed: 3.2 ft at 11:45PM Dec 06, 2023Observed: 3.2 ft at 12:00AM Dec 07, 2023Observed: 3.2 ft at 12:15AM Dec 07, 2023Observed: 3.2 ft at 12:30AM Dec 07, 2023Observed: 3.2 ft at 12:45AM Dec 07, 2023Observed: 3.2 ft at 1:00AM Dec 07, 2023Observed: 3.2 ft at 1:15AM Dec 07, 2023Observed: 3.2 ft at 1:30AM Dec 07, 2023Observed: 3.2 ft at 1:45AM Dec 07, 2023Observed: 3.2 ft at 2:00AM Dec 07, 2023Observed: 3.2 ft at 2:15AM Dec 07, 2023Observed: 3.2 ft at 2:30AM Dec 07, 2023Observed: 3.2 ft at 2:45AM Dec 07, 2023Observed: 3.2 ft at 3:00AM Dec 07, 2023Observed: 3.2 ft at 3:15AM Dec 07, 2023Observed: 3.2 ft at 3:30AM Dec 07, 2023Observed: 3.2 ft at 3:45AM Dec 07, 2023Observed: 3.2 ft at 4:00AM Dec 07, 2023Observed: 3.2 ft at 4:15AM Dec 07, 2023Observed: 3.2 ft at 4:30AM Dec 07, 2023Observed: 3.2 ft at 4:45AM Dec 07, 2023Observed: 3.2 ft at 5:00AM Dec 07, 2023Observed: 3.2 ft at 5:15AM Dec 07, 2023Observed: 3.2 ft at 5:30AM Dec 07, 2023Observed: 3.2 ft at 5:45AM Dec 07, 2023Observed: 3.2 ft at 6:00AM Dec 07, 2023Observed: 3.2 ft at 6:15AM Dec 07, 2023Observed: 3.2 ft at 6:30AM Dec 07, 2023Observed: 3.2 ft at 6:45AM Dec 07, 2023Observed: 3.21 ft at 7:00AM Dec 07, 2023Observed: 3.2 ft at 7:15AM Dec 07, 2023Observed: 3.2 ft at 7:30AM Dec 07, 2023Observed: 3.21 ft at 7:45AM Dec 07, 2023Observed: 3.2 ft at 8:00AM Dec 07, 2023Observed: 3.2 ft at 8:15AM Dec 07, 2023Observed: 3.21 ft at 8:30AM Dec 07, 2023Observed: 3.21 ft at 8:45AM Dec 07, 2023Observed: 3.21 ft at 9:00AM Dec 07, 2023Observed: 3.21 ft at 9:15AM Dec 07, 2023Observed: 3.21 ft at 9:30AM Dec 07, 2023Observed: 3.21 ft at 9:45AM Dec 07, 2023Observed: 3.21 ft at 10:00AM Dec 07, 2023Observed: 3.21 ft at 10:15AM Dec 07, 2023Observed: 3.21 ft at 10:30AM Dec 07, 2023Observed: 3.21 ft at 10:45AM Dec 07, 2023Observed: 3.21 ft at 11:00AM Dec 07, 2023Observed: 3.21 ft at 11:15AM Dec 07, 2023Observed: 3.21 ft at 11:30AM Dec 07, 2023Observed: 3.21 ft at 11:45AM Dec 07, 2023Observed: 3.21 ft at 12:00PM Dec 07, 2023Observed: 3.21 ft at 12:15PM Dec 07, 2023Observed: 3.21 ft at 12:30PM Dec 07, 2023Observed: 3.21 ft at 12:45PM Dec 07, 2023Observed: 3.21 ft at 1:00PM Dec 07, 2023Observed: 3.21 ft at 1:15PM Dec 07, 2023Observed: 3.21 ft at 1:30PM Dec 07, 2023Observed: 3.21 ft at 1:45PM Dec 07, 2023Observed: 3.21 ft at 2:00PM Dec 07, 2023Observed: 3.22 ft at 2:15PM Dec 07, 2023Observed: 3.21 ft at 2:30PM Dec 07, 2023Observed: 3.21 ft at 2:45PM Dec 07, 2023Observed: 3.21 ft at 3:00PM Dec 07, 2023Observed: 3.21 ft at 3:15PM Dec 07, 2023Observed: 3.21 ft at 3:30PM Dec 07, 2023Observed: 3.21 ft at 3:45PM Dec 07, 2023Observed: 3.21 ft at 4:00PM Dec 07, 2023Observed: 3.21 ft at 4:15PM Dec 07, 2023Observed: 3.21 ft at 4:30PM Dec 07, 2023Observed: 3.21 ft at 4:45PM Dec 07, 2023Observed: 3.22 ft at 5:00PM Dec 07, 2023Observed: 3.22 ft at 5:15PM Dec 07, 2023Observed: 3.22 ft at 5:30PM Dec 07, 2023Observed: 3.22 ft at 5:45PM Dec 07, 2023Observed: 3.22 ft at 6:00PM Dec 07, 2023Observed: 3.22 ft at 6:15PM Dec 07, 2023Observed: 3.22 ft at 6:30PM Dec 07, 2023Observed: 3.22 ft at 6:45PM Dec 07, 2023Observed: 3.22 ft at 7:00PM Dec 07, 2023Observed: 3.22 ft at 7:15PM Dec 07, 2023Observed: 3.22 ft at 7:30PM Dec 07, 2023Observed: 3.22 ft at 7:45PM Dec 07, 2023Observed: 3.22 ft at 8:00PM Dec 07, 2023Observed: 3.22 ft at 8:15PM Dec 07, 2023Observed: 3.22 ft at 8:30PM Dec 07, 2023Observed: 3.22 ft at 8:45PM Dec 07, 2023Observed: 3.22 ft at 9:00PM Dec 07, 2023Observed: 3.22 ft at 9:15PM Dec 07, 2023Observed: 3.22 ft at 9:30PM Dec 07, 2023Observed: 3.22 ft at 9:45PM Dec 07, 2023Observed: 3.22 ft at 10:00PM Dec 07, 2023Observed: 3.22 ft at 10:15PM Dec 07, 2023Observed: 3.22 ft at 10:30PM Dec 07, 2023Observed: 3.22 ft at 10:45PM Dec 07, 2023Observed: 3.22 ft at 11:00PM Dec 07, 2023Observed: 3.22 ft at 11:15PM Dec 07, 2023Observed: 3.22 ft at 11:30PM Dec 07, 2023Observed: 3.22 ft at 11:45PM Dec 07, 2023Observed: 3.22 ft at 12:00AM Dec 08, 2023Observed: 3.23 ft at 12:15AM Dec 08, 2023Observed: 3.23 ft at 12:30AM Dec 08, 2023Observed: 3.23 ft at 12:45AM Dec 08, 2023Observed: 3.23 ft at 1:00AM Dec 08, 2023Observed: 3.23 ft at 1:15AM Dec 08, 2023Observed: 3.23 ft at 1:30AM Dec 08, 2023Observed: 3.23 ft at 1:45AM Dec 08, 2023Observed: 3.23 ft at 2:00AM Dec 08, 2023Observed: 3.23 ft at 2:15AM Dec 08, 2023Observed: 3.23 ft at 2:30AM Dec 08, 2023Observed: 3.23 ft at 2:45AM Dec 08, 2023Observed: 3.23 ft at 3:00AM Dec 08, 2023Observed: 3.24 ft at 3:15AM Dec 08, 2023Observed: 3.24 ft at 3:30AM Dec 08, 2023Observed: 3.24 ft at 3:45AM Dec 08, 2023Observed: 3.24 ft at 4:00AM Dec 08, 2023Observed: 3.24 ft at 4:15AM Dec 08, 2023Observed: 3.24 ft at 4:30AM Dec 08, 2023Observed: 3.24 ft at 4:45AM Dec 08, 2023Observed: 3.24 ft at 5:00AM Dec 08, 2023Observed: 3.24 ft at 5:15AM Dec 08, 2023Observed: 3.24 ft at 5:30AM Dec 08, 2023Observed: 3.24 ft at 5:45AM Dec 08, 2023Observed: 3.24 ft at 6:00AM Dec 08, 2023Observed: 3.24 ft at 6:15AM Dec 08, 2023Observed: 3.24 ft at 6:30AM Dec 08, 2023Observed: 3.24 ft at 6:45AM Dec 08, 2023Observed: 3.24 ft at 7:00AM Dec 08, 2023Observed: 3.24 ft at 7:15AM Dec 08, 2023Observed: 3.24 ft at 7:30AM Dec 08, 2023Observed: 3.24 ft at 7:45AM Dec 08, 2023Observed: 3.24 ft at 8:00AM Dec 08, 2023Observed: 3.24 ft at 8:15AM Dec 08, 2023Observed: 3.24 ft at 8:30AM Dec 08, 2023Observed: 3.24 ft at 8:45AM Dec 08, 2023Observed: 3.24 ft at 9:00AM Dec 08, 2023Observed: 3.24 ft at 9:15AM Dec 08, 2023Observed: 3.24 ft at 9:30AM Dec 08, 2023Observed: 3.24 ft at 9:45AM Dec 08, 2023Observed: 3.24 ft at 10:00AM Dec 08, 2023Observed: 3.24 ft at 10:15AM Dec 08, 2023Observed: 3.24 ft at 10:30AM Dec 08, 2023Observed: 3.24 ft at 10:45AM Dec 08, 2023Observed: 3.24 ft at 11:00AM Dec 08, 2023Observed: 3.24 ft at 11:15AM Dec 08, 2023Observed: 3.24 ft at 11:30AM Dec 08, 2023Observed: 3.24 ft at 11:45AM Dec 08, 2023Observed: 3.24 ft at 12:00PM Dec 08, 2023Observed: 3.24 ft at 12:15PM Dec 08, 2023Observed: 3.24 ft at 12:30PM Dec 08, 2023Observed: 3.24 ft at 12:45PM Dec 08, 2023Observed: 3.24 ft at 1:00PM Dec 08, 2023Observed: 3.24 ft at 1:15PM Dec 08, 2023Observed: 3.24 ft at 1:30PM Dec 08, 2023Observed: 3.24 ft at 1:45PM Dec 08, 2023Observed: 3.24 ft at 2:00PM Dec 08, 2023Observed: 3.24 ft at 2:15PM Dec 08, 2023Observed: 3.24 ft at 2:30PM Dec 08, 2023Observed: 3.24 ft at 2:45PM Dec 08, 2023Observed: 3.24 ft at 3:00PM Dec 08, 2023Observed: 3.24 ft at 3:15PM Dec 08, 2023Observed: 3.24 ft at 3:30PM Dec 08, 2023Observed: 3.24 ft at 3:45PM Dec 08, 2023Observed: 3.24 ft at 4:00PM Dec 08, 2023Observed: 3.24 ft at 4:15PM Dec 08, 2023Observed: 3.24 ft at 4:30PM Dec 08, 2023Observed: 3.24 ft at 4:45PM Dec 08, 2023Observed: 3.24 ft at 5:00PM Dec 08, 2023Observed: 3.24 ft at 5:15PM Dec 08, 2023Observed: 3.24 ft at 5:30PM Dec 08, 2023Observed: 3.24 ft at 5:45PM Dec 08, 2023Observed: 3.24 ft at 6:00PM Dec 08, 2023Observed: 3.24 ft at 6:15PM Dec 08, 2023Observed: 3.24 ft at 6:30PM Dec 08, 2023Observed: 3.24 ft at 6:45PM Dec 08, 2023Observed: 3.24 ft at 7:00PM Dec 08, 2023Observed: 3.24 ft at 7:15PM Dec 08, 2023Observed: 3.24 ft at 7:30PM Dec 08, 2023Observed: 3.24 ft at 7:45PM Dec 08, 2023Observed: 3.24 ft at 8:00PM Dec 08, 2023Observed: 3.24 ft at 8:15PM Dec 08, 2023Observed: 3.23 ft at 8:30PM Dec 08, 2023Observed: 3.23 ft at 8:45PM Dec 08, 2023Observed: 3.23 ft at 9:00PM Dec 08, 2023Observed: 3.23 ft at 9:15PM Dec 08, 2023Observed: 3.23 ft at 9:30PM Dec 08, 2023Observed: 3.23 ft at 9:45PM Dec 08, 2023Observed: 3.23 ft at 10:00PM Dec 08, 2023Observed: 3.23 ft at 10:15PM Dec 08, 2023Observed: 3.23 ft at 10:30PM Dec 08, 2023Observed: 3.23 ft at 10:45PM Dec 08, 2023Observed: 3.23 ft at 11:00PM Dec 08, 2023Observed: 3.23 ft at 11:15PM Dec 08, 2023Observed: 3.23 ft at 11:30PM Dec 08, 2023Observed: 3.23 ft at 11:45PM Dec 08, 2023Observed: 3.23 ft at 12:00AM Dec 09, 2023Observed: 3.23 ft at 12:15AM Dec 09, 2023Observed: 3.23 ft at 12:30AM Dec 09, 2023Observed: 3.23 ft at 12:45AM Dec 09, 2023Observed: 3.23 ft at 1:00AM Dec 09, 2023Observed: 3.23 ft at 1:15AM Dec 09, 2023Observed: 3.23 ft at 1:30AM Dec 09, 2023Observed: 3.23 ft at 1:45AM Dec 09, 2023Observed: 3.23 ft at 2:00AM Dec 09, 2023Observed: 3.23 ft at 2:15AM Dec 09, 2023Observed: 3.23 ft at 2:30AM Dec 09, 2023Observed: 3.23 ft at 2:45AM Dec 09, 2023Observed: 3.23 ft at 3:00AM Dec 09, 2023Observed: 3.23 ft at 3:15AM Dec 09, 2023Observed: 3.23 ft at 3:30AM Dec 09, 2023Observed: 3.23 ft at 3:45AM Dec 09, 2023Observed: 3.23 ft at 4:00AM Dec 09, 2023Observed: 3.23 ft at 4:15AM Dec 09, 2023Observed: 3.23 ft at 4:30AM Dec 09, 2023Observed: 3.23 ft at 4:45AM Dec 09, 2023Observed: 3.23 ft at 5:00AM Dec 09, 2023Observed: 3.23 ft at 5:15AM Dec 09, 2023Observed: 3.23 ft at 5:30AM Dec 09, 2023Observed: 3.22 ft at 5:45AM Dec 09, 2023Observed: 3.22 ft at 6:00AM Dec 09, 2023Observed: 3.22 ft at 6:15AM Dec 09, 2023Observed: 3.22 ft at 6:30AM Dec 09, 2023Observed: 3.22 ft at 6:45AM Dec 09, 2023Observed: 3.22 ft at 7:00AM Dec 09, 2023Observed: 3.22 ft at 7:15AM Dec 09, 2023Observed: 3.22 ft at 7:30AM Dec 09, 2023Observed: 3.22 ft at 7:45AM Dec 09, 2023Observed: 3.21 ft at 8:00AM Dec 09, 2023Observed: 3.21 ft at 8:15AM Dec 09, 2023Observed: 3.21 ft at 8:30AM Dec 09, 2023Observed: 3.21 ft at 8:45AM Dec 09, 2023Observed: 3.21 ft at 9:00AM Dec 09, 2023Observed: 3.21 ft at 9:15AM Dec 09, 2023Observed: 3.21 ft at 9:30AM Dec 09, 2023Observed: 3.21 ft at 9:45AM Dec 09, 2023Observed: 3.21 ft at 10:00AM Dec 09, 2023Observed: 3.21 ft at 10:15AM Dec 09, 2023Observed: 3.2 ft at 10:30AM Dec 09, 2023Observed: 3.2 ft at 10:45AM Dec 09, 2023Observed: 3.2 ft at 11:00AM Dec 09, 2023Observed: 3.2 ft at 11:15AM Dec 09, 2023Observed: 3.2 ft at 11:30AM Dec 09, 2023Observed: 3.2 ft at 11:45AM Dec 09, 2023Observed: 3.2 ft at 12:00PM Dec 09, 2023Observed: 3.2 ft at 12:15PM Dec 09, 2023Observed: 3.2 ft at 12:30PM Dec 09, 2023Observed: 3.2 ft at 12:45PM Dec 09, 2023Observed: 3.2 ft at 1:00PM Dec 09, 2023Observed: 3.2 ft at 1:15PM Dec 09, 2023Observed: 3.2 ft at 1:30PM Dec 09, 2023Observed: 3.2 ft at 1:45PM Dec 09, 2023Observed: 3.2 ft at 2:00PM Dec 09, 2023Observed: 3.2 ft at 2:15PM Dec 09, 2023Observed: 3.2 ft at 2:30PM Dec 09, 2023Observed: 3.2 ft at 2:45PM Dec 09, 2023Observed: 3.2 ft at 3:00PM Dec 09, 2023Observed: 3.2 ft at 3:15PM Dec 09, 2023Observed: 3.2 ft at 3:30PM Dec 09, 2023Observed: 3.2 ft at 3:45PM Dec 09, 2023Observed: 3.2 ft at 4:00PM Dec 09, 2023Observed: 3.2 ft at 4:15PM Dec 09, 2023Observed: 3.2 ft at 4:30PM Dec 09, 2023Observed: 3.2 ft at 4:45PM Dec 09, 2023Observed: 3.2 ft at 5:00PM Dec 09, 2023Observed: 3.2 ft at 5:15PM Dec 09, 2023Observed: 3.2 ft at 5:30PM Dec 09, 2023Observed: 3.2 ft at 5:45PM Dec 09, 2023Observed: 3.2 ft at 6:00PM Dec 09, 2023Observed: 3.2 ft at 6:15PM Dec 09, 2023Observed: 3.2 ft at 6:30PM Dec 09, 2023Observed: 3.2 ft at 6:45PM Dec 09, 2023Observed: 3.2 ft at 7:00PM Dec 09, 2023Observed: 3.2 ft at 7:15PM Dec 09, 2023Observed: 3.2 ft at 7:30PM Dec 09, 2023Observed: 3.19 ft at 7:45PM Dec 09, 2023Observed: 3.19 ft at 8:00PM Dec 09, 2023Observed: 3.19 ft at 8:15PM Dec 09, 2023Observed: 3.19 ft at 8:30PM Dec 09, 2023Observed: 3.19 ft at 8:45PM Dec 09, 2023Observed: 3.19 ft at 9:00PM Dec 09, 2023Observed: 3.19 ft at 9:15PM Dec 09, 2023Observed: 3.19 ft at 9:30PM Dec 09, 2023Observed: 3.19 ft at 9:45PM Dec 09, 2023Observed: 3.19 ft at 10:00PM Dec 09, 2023Observed: 3.19 ft at 10:15PM Dec 09, 2023Observed: 3.19 ft at 10:30PM Dec 09, 2023Observed: 3.19 ft at 10:45PM Dec 09, 2023Observed: 3.19 ft at 11:00PM Dec 09, 2023Observed: 3.19 ft at 11:15PM Dec 09, 2023Observed: 3.19 ft at 11:30PM Dec 09, 2023Observed: 3.19 ft at 11:45PM Dec 09, 2023Observed: 3.19 ft at 12:00AM Dec 10, 2023Observed: 3.19 ft at 12:15AM Dec 10, 2023Observed: 3.19 ft at 12:30AM Dec 10, 2023Observed: 3.19 ft at 12:45AM Dec 10, 2023Observed: 3.19 ft at 1:00AM Dec 10, 2023Observed: 3.19 ft at 1:15AM Dec 10, 2023Observed: 3.19 ft at 1:30AM Dec 10, 2023Observed: 3.19 ft at 1:45AM Dec 10, 2023Observed: 3.19 ft at 2:00AM Dec 10, 2023Observed: 3.19 ft at 2:15AM Dec 10, 2023Observed: 3.19 ft at 2:30AM Dec 10, 2023Observed: 3.19 ft at 2:45AM Dec 10, 2023Observed: 3.18 ft at 3:00AM Dec 10, 2023Observed: 3.18 ft at 3:15AM Dec 10, 2023Observed: 3.18 ft at 3:30AM Dec 10, 2023Observed: 3.18 ft at 3:45AM Dec 10, 2023Observed: 3.18 ft at 4:00AM Dec 10, 2023Observed: 3.18 ft at 4:15AM Dec 10, 2023Observed: 3.18 ft at 4:30AM Dec 10, 2023Observed: 3.18 ft at 4:45AM Dec 10, 2023Observed: 3.18 ft at 5:00AM Dec 10, 2023Observed: 3.18 ft at 5:15AM Dec 10, 2023Observed: 3.18 ft at 5:30AM Dec 10, 2023Observed: 3.18 ft at 5:45AM Dec 10, 2023Observed: 3.18 ft at 6:00AM Dec 10, 2023Observed: 3.18 ft at 6:15AM Dec 10, 2023Observed: 3.18 ft at 6:30AM Dec 10, 2023Observed: 3.18 ft at 6:45AM Dec 10, 2023Observed: 3.18 ft at 7:00AM Dec 10, 2023Observed: 3.18 ft at 7:15AM Dec 10, 2023Observed: 3.18 ft at 7:30AM Dec 10, 2023Observed: 3.18 ft at 7:45AM Dec 10, 2023Observed: 3.18 ft at 8:00AM Dec 10, 2023Observed: 3.18 ft at 8:15AM Dec 10, 2023Observed: 3.18 ft at 8:30AM Dec 10, 2023Observed: 3.18 ft at 8:45AM Dec 10, 2023Observed: 3.18 ft at 9:00AM Dec 10, 2023Observed: 3.18 ft at 9:15AM Dec 10, 2023Observed: 3.2 ft at 9:30AM Dec 10, 2023Observed: 3.2 ft at 9:45AM Dec 10, 2023Observed: 3.2 ft at 10:00AM Dec 10, 2023Observed: 3.2 ft at 10:15AM Dec 10, 2023Observed: 3.2 ft at 10:30AM Dec 10, 2023Observed: 3.2 ft at 10:45AM Dec 10, 2023Observed: 3.2 ft at 11:00AM Dec 10, 2023Observed: 3.2 ft at 11:15AM Dec 10, 2023Observed: 3.2 ft at 11:30AM Dec 10, 2023Observed: 3.2 ft at 11:45AM Dec 10, 2023Observed: 3.2 ft at 12:00PM Dec 10, 2023Observed: 3.2 ft at 12:15PM Dec 10, 2023Observed: 3.2 ft at 12:30PM Dec 10, 2023Observed: 3.2 ft at 12:45PM Dec 10, 2023Observed: 3.2 ft at 1:00PM Dec 10, 2023Observed: 3.2 ft at 1:15PM Dec 10, 2023Observed: 3.2 ft at 1:30PM Dec 10, 2023Observed: 3.2 ft at 1:45PM Dec 10, 2023Observed: 3.2 ft at 2:00PM Dec 10, 2023Observed: 3.2 ft at 2:15PM Dec 10, 2023Observed: 3.2 ft at 2:30PM Dec 10, 2023Observed: 3.21 ft at 2:45PM Dec 10, 2023Observed: 3.21 ft at 3:00PM Dec 10, 2023Observed: 3.21 ft at 3:15PM Dec 10, 2023Observed: 3.21 ft at 3:30PM Dec 10, 2023Observed: 3.21 ft at 3:45PM Dec 10, 2023Observed: 3.21 ft at 4:00PM Dec 10, 2023Observed: 3.21 ft at 4:15PM Dec 10, 2023Observed: 3.21 ft at 4:30PM Dec 10, 2023Observed: 3.22 ft at 4:45PM Dec 10, 2023Observed: 3.22 ft at 5:00PM Dec 10, 2023Observed: 3.22 ft at 5:15PM Dec 10, 2023Observed: 3.23 ft at 5:30PM Dec 10, 2023Observed: 3.23 ft at 5:45PM Dec 10, 2023Observed: 3.23 ft at 6:00PM Dec 10, 2023Observed: 3.23 ft at 6:15PM Dec 10, 2023Observed: 3.23 ft at 6:30PM Dec 10, 2023Observed: 3.23 ft at 6:45PM Dec 10, 2023Observed: 3.23 ft at 7:00PM Dec 10, 2023Observed: 3.23 ft at 7:15PM Dec 10, 2023Observed: 3.23 ft at 7:30PM Dec 10, 2023Observed: 3.24 ft at 7:45PM Dec 10, 2023Observed: 3.24 ft at 8:00PM Dec 10, 2023Observed: 3.25 ft at 8:15PM Dec 10, 2023Observed: 3.25 ft at 8:30PM Dec 10, 2023Observed: 3.26 ft at 8:45PM Dec 10, 2023Observed: 3.26 ft at 9:00PM Dec 10, 2023Observed: 3.26 ft at 9:15PM Dec 10, 2023Observed: 3.27 ft at 9:30PM Dec 10, 2023Observed: 3.27 ft at 9:45PM Dec 10, 2023Observed: 3.28 ft at 10:00PM Dec 10, 2023Observed: 3.28 ft at 10:15PM Dec 10, 2023Observed: 3.29 ft at 10:30PM Dec 10, 2023Observed: 3.29 ft at 10:45PM Dec 10, 2023Observed: 3.3 ft at 11:00PM Dec 10, 2023Observed: 3.3 ft at 11:15PM Dec 10, 2023Observed: 3.3 ft at 11:30PM Dec 10, 2023Observed: 3.31 ft at 11:45PM Dec 10, 2023Observed: 3.31 ft at 12:00AM Dec 11, 2023Observed: 3.32 ft at 12:15AM Dec 11, 2023Observed: 3.32 ft at 12:30AM Dec 11, 2023Observed: 3.33 ft at 12:45AM Dec 11, 2023Observed: 3.34 ft at 1:00AM Dec 11, 2023Observed: 3.34 ft at 1:15AM Dec 11, 2023Observed: 3.35 ft at 1:30AM Dec 11, 2023Observed: 3.36 ft at 1:45AM Dec 11, 2023Observed: 3.36 ft at 2:00AM Dec 11, 2023Observed: 3.37 ft at 2:15AM Dec 11, 2023Observed: 3.38 ft at 2:30AM Dec 11, 2023Observed: 3.38 ft at 2:45AM Dec 11, 2023Observed: 3.39 ft at 3:00AM Dec 11, 2023Observed: 3.39 ft at 3:15AM Dec 11, 2023Observed: 3.4 ft at 3:30AM Dec 11, 2023Observed: 3.41 ft at 3:45AM Dec 11, 2023Observed: 3.42 ft at 4:00AM Dec 11, 2023Observed: 3.42 ft at 4:15AM Dec 11, 2023Observed: 3.43 ft at 4:30AM Dec 11, 2023Observed: 3.44 ft at 4:45AM Dec 11, 2023Observed: 3.45 ft at 5:00AM Dec 11, 2023Observed: 3.46 ft at 5:15AM Dec 11, 2023Observed: 3.47 ft at 5:30AM Dec 11, 2023Observed: 3.47 ft at 5:45AM Dec 11, 2023Observed: 3.47 ft at 6:00AM Dec 11, 2023Observed: 3.49 ft at 6:15AM Dec 11, 2023Observed: 3.5 ft at 6:30AM Dec 11, 2023Observed: 3.51 ft at 6:45AM Dec 11, 2023Observed: 3.52 ft at 7:00AM Dec 11, 2023Observed: 3.53 ft at 7:15AM Dec 11, 2023Observed: 3.55 ft at 7:30AM Dec 11, 2023Observed: 3.56 ft at 7:45AM Dec 11, 2023Observed: 3.57 ft at 8:00AM Dec 11, 2023Observed: 3.59 ft at 8:15AM Dec 11, 2023Observed: 3.6 ft at 8:30AM Dec 11, 2023Observed: 3.61 ft at 8:45AM Dec 11, 2023Observed: 3.63 ft at 9:00AM Dec 11, 2023Highest Observation: 3.64 ft at 9:15AM Dec 11, 2023Forecast: 4.6 ft 1:00PM Dec 11, 2023Forecast: 5.4 ft 7:00PM Dec 11, 2023Forecast: 6.2 ft 1:00AM Dec 12, 2023Highest Forecast: 6.7 ft 7:00AM Dec 12, 2023Forecast: 6.4 ft 1:00PM Dec 12, 2023Forecast: 5.8 ft 7:00PM Dec 12, 2023Forecast: 5.4 ft 1:00AM Dec 13, 2023Forecast: 5.1 ft 7:00AM Dec 13, 2023Forecast: 4.9 ft 1:00PM Dec 13, 2023Forecast: 4.7 ft 7:00PM Dec 13, 2023Forecast: 4.5 ft 1:00AM Dec 14, 2023USGS--Water Resources of the United StatesHNKM2(plotting HGIRG) Graph Created (10:11AM Dec 11, 2023)ObservedForecast (issued 2:46AM Dec 11)Latest observed value: 3.64 ft at 9:15 AM EST 11-Dec-2023. Flood Stage is 25 ft
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Tabular Data (UTC)
Tabular Data (EST)
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NOTE: Stage may be affected by ice.

NOTE: Forecasts for the Potomac River at Hancock are issued routinely year-round.

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Upstream Gauge - at Paw Paw Upstream Gauge Downstream Gauge Downstream Gauge - at Dam Number Five above Williamsport
Flood Categories (in feet)
Major Flood Stage: 35
Moderate Flood Stage: 33
Flood Stage: 25
Action Stage: 21
Low Stage (in feet): -9999

Historic Crests
(1) 47.60 ft on 03/18/1936
(2) 41.20 ft on 11/06/1985
(3) 40.00 ft on 06/01/1889
(4) 36.63 ft on 10/16/1942
(5) 36.26 ft on 01/20/1996
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 23.57 ft on 12/16/2018
(2) 26.38 ft on 06/04/2018
(3) 21.33 ft on 05/17/2014
(4) 25.41 ft on 05/19/2011
(5) 25.94 ft on 03/14/2010
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 2.00 ft on 10/04/1932
(2) 2.12 ft on 09/12/1966
Zoom Level:14
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Gauge LocationGauge Map Marker
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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 Collapse
If you notice any errors in the below information, please contact our Webmaster
56 Water approaches the highest point on Main Street.
46 Water floods the railroad depot.
45 Floodwater isolates the town of Hancock.
40 Water floods 25 to 30 homes along the West Virginia side of the river just downstream from Hancock, and at least another 20 to 30 in Hancock itself.
35 Water inundates 20 to 30 homes and 5 or more businesses in the west end of Hancock.
33 Water floods low spots on East Main Street in Hancock.
31 Water begins to flood low spots of West Main Street in Hancock.
30 Water begins to inundate homes and business in Hancock. Water covers the road to the maintenance shop for the National Park Service near Hancock. The west end of the Potomac Airpark runway begins to flood.
28 Water begins to inundate some yards on the west end of Hancock. Water also begins to collect on the west end of the CSX Railyard on the West Virginia side.
25 Water may begin to inundate low points of the CSX Railroad tracks on the West Virginia side of the river due to backwater. Additionally, access to Potomac Airpark may be restricted due to backwater. Water reaches the top of the Hancock boat ramp and begins to spill over into the adjacent parking lot.
24 Water begins to overflow into low lying areas.
21 The boat ramp at Four Locks is covered by water. Half the parking lot there is also covered.
7.5 The river is at danger level for boaters as defined by the State of Maryland. At these levels, conditions are extremely hazardous.
3.5 The river reaches caution level for boaters as defined by the State of Maryland. Fast moving water and changing currents can be expected.
About This Location Collapse

Latitude: 39.697500° N, Longitude: 78.177778° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 25 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 29 383.68 ft 413.68 ft Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  

Current/Historical Observations:
Additional Information Collapse
Potential River Levels - Used to
Potential River Levels
Used to Estimate the Chance of Flooding and the Range of Possible River Levels
10 Day (HEFS) 10 Day (NAEFS) 10 Day (GEFS)
HEFS Ensemble NAEFS Ensemble GEFS Ensemble

Note: Use the official hydrograph at the top of this web page for river levels within the next 72 hours.

Click individual graphics to enlarge.
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Hydrologic Resources Additional Resources
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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
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