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Web Portal Changes: In Spring 2024, the Advanced Hydrologic Prediction Service (AHPS) hosted at https://water.weather.gov will be replaced by the National Water Prediction Service (NWPS) at a repurposed https://water.noaa.gov. A preview of NWPS is available here, where you can see your station hydrograph by replacing SSSSS with the station 5-character id: https://preview.water.noaa.gov/gauges/SSSSS.

Flood Inundation Mapping: Experimental real-time flood Inundation mapping services for 10% of the United States are now available via the NWS Map Viewer. Additional products and geospatial services depicting River Forecast Center and National Water Model forecasts continue to be accessible as described in the StoryMap here.

Please visit https://www.weather.gov/owp/operations for more information.



Hydrograph River at a Glance Download
Potomac River at Point of Rocks Stage (ft)Flow (kcfs)Highest Observation: 6.73 ft at 10:45PM Mar 13, 2024Observed: 6.72 ft at 11:00PM Mar 13, 2024Observed: 6.69 ft at 11:15PM Mar 13, 2024Observed: 6.69 ft at 11:30PM Mar 13, 2024Observed: 6.68 ft at 11:45PM Mar 13, 2024Observed: 6.67 ft at 12:00AM Mar 14, 2024Observed: 6.66 ft at 12:15AM Mar 14, 2024Observed: 6.64 ft at 12:30AM Mar 14, 2024Observed: 6.64 ft at 12:45AM Mar 14, 2024Observed: 6.63 ft at 1:00AM Mar 14, 2024Observed: 6.62 ft at 1:15AM Mar 14, 2024Observed: 6.62 ft at 1:30AM Mar 14, 2024Observed: 6.6 ft at 1:45AM Mar 14, 2024Observed: 6.59 ft at 2:00AM Mar 14, 2024Observed: 6.58 ft at 2:15AM Mar 14, 2024Observed: 6.56 ft at 2:30AM Mar 14, 2024Observed: 6.57 ft at 2:45AM Mar 14, 2024Observed: 6.55 ft at 3:00AM Mar 14, 2024Observed: 6.54 ft at 3:15AM Mar 14, 2024Observed: 6.53 ft at 3:30AM Mar 14, 2024Observed: 6.52 ft at 3:45AM Mar 14, 2024Observed: 6.52 ft at 4:00AM Mar 14, 2024Observed: 6.51 ft at 4:15AM Mar 14, 2024Observed: 6.49 ft at 4:30AM Mar 14, 2024Observed: 6.47 ft at 4:45AM Mar 14, 2024Observed: 6.47 ft at 5:00AM Mar 14, 2024Observed: 6.46 ft at 5:15AM Mar 14, 2024Observed: 6.45 ft at 5:30AM Mar 14, 2024Observed: 6.43 ft at 5:45AM Mar 14, 2024Observed: 6.43 ft at 6:00AM Mar 14, 2024Observed: 6.42 ft at 6:15AM Mar 14, 2024Observed: 6.42 ft at 6:30AM Mar 14, 2024Observed: 6.4 ft at 6:45AM Mar 14, 2024Observed: 6.39 ft at 7:00AM Mar 14, 2024Observed: 6.38 ft at 7:15AM Mar 14, 2024Observed: 6.37 ft at 7:30AM Mar 14, 2024Observed: 6.36 ft at 7:45AM Mar 14, 2024Observed: 6.36 ft at 8:00AM Mar 14, 2024Observed: 6.35 ft at 8:15AM Mar 14, 2024Observed: 6.34 ft at 8:30AM Mar 14, 2024Observed: 6.33 ft at 8:45AM Mar 14, 2024Observed: 6.32 ft at 9:00AM Mar 14, 2024Observed: 6.31 ft at 9:15AM Mar 14, 2024Observed: 6.31 ft at 9:30AM Mar 14, 2024Observed: 6.3 ft at 9:45AM Mar 14, 2024Observed: 6.29 ft at 10:00AM Mar 14, 2024Observed: 6.28 ft at 10:15AM Mar 14, 2024Observed: 6.28 ft at 10:30AM Mar 14, 2024Observed: 6.27 ft at 10:45AM Mar 14, 2024Observed: 6.26 ft at 11:00AM Mar 14, 2024Observed: 6.25 ft at 11:15AM Mar 14, 2024Observed: 6.25 ft at 11:30AM Mar 14, 2024Observed: 6.23 ft at 11:45AM Mar 14, 2024Observed: 6.23 ft at 12:00PM Mar 14, 2024Observed: 6.22 ft at 12:15PM Mar 14, 2024Observed: 6.21 ft at 12:30PM Mar 14, 2024Observed: 6.2 ft at 12:45PM Mar 14, 2024Observed: 6.2 ft at 1:00PM Mar 14, 2024Observed: 6.18 ft at 1:15PM Mar 14, 2024Observed: 6.18 ft at 1:30PM Mar 14, 2024Observed: 6.17 ft at 1:45PM Mar 14, 2024Observed: 6.16 ft at 2:00PM Mar 14, 2024Observed: 6.14 ft at 2:15PM Mar 14, 2024Observed: 6.15 ft at 2:30PM Mar 14, 2024Observed: 6.14 ft at 2:45PM Mar 14, 2024Observed: 6.13 ft at 3:00PM Mar 14, 2024Observed: 6.11 ft at 3:15PM Mar 14, 2024Observed: 6.1 ft at 3:30PM Mar 14, 2024Observed: 6.1 ft at 3:45PM Mar 14, 2024Observed: 6.1 ft at 4:00PM Mar 14, 2024Observed: 6.09 ft at 4:15PM Mar 14, 2024Observed: 6.09 ft at 4:30PM Mar 14, 2024Observed: 6.08 ft at 4:45PM Mar 14, 2024Observed: 6.07 ft at 5:00PM Mar 14, 2024Observed: 6.04 ft at 5:15PM Mar 14, 2024Observed: 6.05 ft at 5:30PM Mar 14, 2024Observed: 6.04 ft at 5:45PM Mar 14, 2024Observed: 6.03 ft at 6:00PM Mar 14, 2024Observed: 6.02 ft at 6:15PM Mar 14, 2024Observed: 6.01 ft at 6:30PM Mar 14, 2024Observed: 6 ft at 6:45PM Mar 14, 2024Observed: 6 ft at 7:00PM Mar 14, 2024Observed: 6 ft at 7:15PM Mar 14, 2024Observed: 5.98 ft at 7:30PM Mar 14, 2024Observed: 5.98 ft at 7:45PM Mar 14, 2024Observed: 5.97 ft at 8:00PM Mar 14, 2024Observed: 5.96 ft at 8:15PM Mar 14, 2024Observed: 5.93 ft at 8:30PM Mar 14, 2024Observed: 5.93 ft at 8:45PM Mar 14, 2024Observed: 5.95 ft at 9:00PM Mar 14, 2024Observed: 5.92 ft at 9:15PM Mar 14, 2024Observed: 5.91 ft at 9:30PM Mar 14, 2024Observed: 5.9 ft at 9:45PM Mar 14, 2024Observed: 5.9 ft at 10:00PM Mar 14, 2024Observed: 5.89 ft at 10:15PM Mar 14, 2024Observed: 5.88 ft at 10:30PM Mar 14, 2024Observed: 5.87 ft at 10:45PM Mar 14, 2024Observed: 5.87 ft at 11:00PM Mar 14, 2024Observed: 5.87 ft at 11:15PM Mar 14, 2024Observed: 5.85 ft at 11:30PM Mar 14, 2024Observed: 5.85 ft at 11:45PM Mar 14, 2024Observed: 5.84 ft at 12:00AM Mar 15, 2024Observed: 5.83 ft at 12:15AM Mar 15, 2024Observed: 5.83 ft at 12:30AM Mar 15, 2024Observed: 5.81 ft at 12:45AM Mar 15, 2024Observed: 5.81 ft at 1:00AM Mar 15, 2024Observed: 5.8 ft at 1:15AM Mar 15, 2024Observed: 5.79 ft at 1:30AM Mar 15, 2024Observed: 5.79 ft at 1:45AM Mar 15, 2024Observed: 5.78 ft at 2:00AM Mar 15, 2024Observed: 5.78 ft at 2:15AM Mar 15, 2024Observed: 5.77 ft at 2:30AM Mar 15, 2024Observed: 5.76 ft at 2:45AM Mar 15, 2024Observed: 5.76 ft at 3:00AM Mar 15, 2024Observed: 5.74 ft at 3:15AM Mar 15, 2024Observed: 5.75 ft at 3:30AM Mar 15, 2024Observed: 5.73 ft at 3:45AM Mar 15, 2024Observed: 5.72 ft at 4:00AM Mar 15, 2024Observed: 5.72 ft at 4:15AM Mar 15, 2024Observed: 5.71 ft at 4:30AM Mar 15, 2024Observed: 5.7 ft at 4:45AM Mar 15, 2024Observed: 5.7 ft at 5:00AM Mar 15, 2024Observed: 5.7 ft at 5:15AM Mar 15, 2024Observed: 5.69 ft at 5:30AM Mar 15, 2024Observed: 5.68 ft at 5:45AM Mar 15, 2024Observed: 5.68 ft at 6:00AM Mar 15, 2024Observed: 5.67 ft at 6:15AM Mar 15, 2024Observed: 5.66 ft at 6:30AM Mar 15, 2024Observed: 5.65 ft at 6:45AM Mar 15, 2024Observed: 5.65 ft at 7:00AM Mar 15, 2024Observed: 5.64 ft at 7:15AM Mar 15, 2024Observed: 5.63 ft at 7:30AM Mar 15, 2024Observed: 5.64 ft at 7:45AM Mar 15, 2024Observed: 5.61 ft at 8:00AM Mar 15, 2024Observed: 5.61 ft at 8:15AM Mar 15, 2024Observed: 5.61 ft at 8:30AM Mar 15, 2024Observed: 5.61 ft at 8:45AM Mar 15, 2024Observed: 5.59 ft at 9:00AM Mar 15, 2024Observed: 5.59 ft at 9:15AM Mar 15, 2024Observed: 5.59 ft at 9:30AM Mar 15, 2024Observed: 5.57 ft at 9:45AM Mar 15, 2024Observed: 5.57 ft at 10:00AM Mar 15, 2024Observed: 5.57 ft at 10:15AM Mar 15, 2024Observed: 5.56 ft at 10:30AM Mar 15, 2024Observed: 5.56 ft at 10:45AM Mar 15, 2024Observed: 5.53 ft at 11:00AM Mar 15, 2024Observed: 5.55 ft at 11:15AM Mar 15, 2024Observed: 5.53 ft at 11:30AM Mar 15, 2024Observed: 5.54 ft at 11:45AM Mar 15, 2024Observed: 5.53 ft at 12:00PM Mar 15, 2024Observed: 5.53 ft at 12:15PM Mar 15, 2024Observed: 5.53 ft at 12:30PM Mar 15, 2024Observed: 5.52 ft at 12:45PM Mar 15, 2024Observed: 5.52 ft at 1:00PM Mar 15, 2024Observed: 5.52 ft at 1:15PM Mar 15, 2024Observed: 5.51 ft at 1:30PM Mar 15, 2024Observed: 5.49 ft at 1:45PM Mar 15, 2024Observed: 5.5 ft at 2:00PM Mar 15, 2024Observed: 5.49 ft at 2:15PM Mar 15, 2024Observed: 5.47 ft at 2:30PM Mar 15, 2024Observed: 5.47 ft at 2:45PM Mar 15, 2024Observed: 5.47 ft at 3:00PM Mar 15, 2024Observed: 5.47 ft at 3:15PM Mar 15, 2024Observed: 5.46 ft at 3:30PM Mar 15, 2024Observed: 5.44 ft at 3:45PM Mar 15, 2024Observed: 5.45 ft at 4:00PM Mar 15, 2024Observed: 5.44 ft at 4:15PM Mar 15, 2024Observed: 5.44 ft at 4:30PM Mar 15, 2024Observed: 5.44 ft at 4:45PM Mar 15, 2024Observed: 5.43 ft at 5:00PM Mar 15, 2024Observed: 5.42 ft at 5:15PM Mar 15, 2024Observed: 5.41 ft at 5:30PM Mar 15, 2024Observed: 5.42 ft at 5:45PM Mar 15, 2024Observed: 5.42 ft at 6:00PM Mar 15, 2024Observed: 5.4 ft at 6:15PM Mar 15, 2024Observed: 5.4 ft at 6:30PM Mar 15, 2024Observed: 5.4 ft at 6:45PM Mar 15, 2024Observed: 5.4 ft at 7:00PM Mar 15, 2024Observed: 5.4 ft at 7:15PM Mar 15, 2024Observed: 5.39 ft at 7:30PM Mar 15, 2024Observed: 5.39 ft at 7:45PM Mar 15, 2024Observed: 5.39 ft at 8:00PM Mar 15, 2024Observed: 5.39 ft at 8:15PM Mar 15, 2024Observed: 5.38 ft at 8:30PM Mar 15, 2024Observed: 5.38 ft at 8:45PM Mar 15, 2024Observed: 5.38 ft at 9:00PM Mar 15, 2024Observed: 5.37 ft at 9:15PM Mar 15, 2024Observed: 5.37 ft at 9:30PM Mar 15, 2024Observed: 5.37 ft at 9:45PM Mar 15, 2024Observed: 5.36 ft at 10:00PM Mar 15, 2024Observed: 5.35 ft at 10:15PM Mar 15, 2024Observed: 5.35 ft at 10:30PM Mar 15, 2024Observed: 5.34 ft at 10:45PM Mar 15, 2024Observed: 5.34 ft at 11:00PM Mar 15, 2024Observed: 5.33 ft at 11:15PM Mar 15, 2024Observed: 5.33 ft at 11:30PM Mar 15, 2024Observed: 5.33 ft at 11:45PM Mar 15, 2024Observed: 5.32 ft at 12:00AM Mar 16, 2024Observed: 5.32 ft at 12:15AM Mar 16, 2024Observed: 5.32 ft at 12:30AM Mar 16, 2024Observed: 5.33 ft at 12:45AM Mar 16, 2024Observed: 5.32 ft at 1:00AM Mar 16, 2024Observed: 5.31 ft at 1:15AM Mar 16, 2024Observed: 5.32 ft at 1:30AM Mar 16, 2024Observed: 5.3 ft at 1:45AM Mar 16, 2024Observed: 5.31 ft at 2:00AM Mar 16, 2024Observed: 5.31 ft at 2:15AM Mar 16, 2024Observed: 5.3 ft at 2:30AM Mar 16, 2024Observed: 5.3 ft at 2:45AM Mar 16, 2024Observed: 5.3 ft at 3:00AM Mar 16, 2024Observed: 5.29 ft at 3:15AM Mar 16, 2024Observed: 5.27 ft at 3:30AM Mar 16, 2024Observed: 5.28 ft at 3:45AM Mar 16, 2024Observed: 5.28 ft at 4:00AM Mar 16, 2024Observed: 5.28 ft at 4:15AM Mar 16, 2024Observed: 5.27 ft at 4:30AM Mar 16, 2024Observed: 5.27 ft at 4:45AM Mar 16, 2024Observed: 5.27 ft at 5:00AM Mar 16, 2024Observed: 5.25 ft at 5:15AM Mar 16, 2024Observed: 5.26 ft at 5:30AM Mar 16, 2024Observed: 5.25 ft at 5:45AM Mar 16, 2024Observed: 5.24 ft at 6:00AM Mar 16, 2024Observed: 5.25 ft at 6:15AM Mar 16, 2024Observed: 5.24 ft at 6:30AM Mar 16, 2024Observed: 5.24 ft at 6:45AM Mar 16, 2024Observed: 5.24 ft at 7:00AM Mar 16, 2024Observed: 5.23 ft at 7:15AM Mar 16, 2024Observed: 5.24 ft at 7:30AM Mar 16, 2024Observed: 5.22 ft at 7:45AM Mar 16, 2024Observed: 5.22 ft at 8:00AM Mar 16, 2024Observed: 5.21 ft at 8:15AM Mar 16, 2024Observed: 5.22 ft at 8:30AM Mar 16, 2024Observed: 5.22 ft at 8:45AM Mar 16, 2024Observed: 5.21 ft at 9:00AM Mar 16, 2024Observed: 5.21 ft at 9:15AM Mar 16, 2024Observed: 5.2 ft at 9:30AM Mar 16, 2024Observed: 5.2 ft at 9:45AM Mar 16, 2024Observed: 5.2 ft at 10:00AM Mar 16, 2024Observed: 5.2 ft at 10:15AM Mar 16, 2024Observed: 5.2 ft at 10:30AM Mar 16, 2024Observed: 5.2 ft at 10:45AM Mar 16, 2024Observed: 5.2 ft at 11:00AM Mar 16, 2024Observed: 5.19 ft at 11:15AM Mar 16, 2024Observed: 5.19 ft at 11:30AM Mar 16, 2024Observed: 5.19 ft at 11:45AM Mar 16, 2024Observed: 5.19 ft at 12:00PM Mar 16, 2024Observed: 5.18 ft at 12:15PM Mar 16, 2024Observed: 5.18 ft at 12:30PM Mar 16, 2024Observed: 5.19 ft at 12:45PM Mar 16, 2024Observed: 5.17 ft at 1:00PM Mar 16, 2024Observed: 5.17 ft at 1:15PM Mar 16, 2024Observed: 5.17 ft at 1:30PM Mar 16, 2024Observed: 5.16 ft at 1:45PM Mar 16, 2024Observed: 5.16 ft at 2:00PM Mar 16, 2024Observed: 5.15 ft at 2:15PM Mar 16, 2024Observed: 5.15 ft at 2:30PM Mar 16, 2024Observed: 5.16 ft at 2:45PM Mar 16, 2024Observed: 5.16 ft at 3:00PM Mar 16, 2024Observed: 5.15 ft at 3:15PM Mar 16, 2024Observed: 5.14 ft at 3:30PM Mar 16, 2024Observed: 5.15 ft at 3:45PM Mar 16, 2024Observed: 5.14 ft at 4:00PM Mar 16, 2024Observed: 5.13 ft at 4:15PM Mar 16, 2024Observed: 5.13 ft at 4:30PM Mar 16, 2024Observed: 5.13 ft at 4:45PM Mar 16, 2024Observed: 5.12 ft at 5:00PM Mar 16, 2024Observed: 5.12 ft at 5:15PM Mar 16, 2024Observed: 5.12 ft at 5:30PM Mar 16, 2024Observed: 5.12 ft at 5:45PM Mar 16, 2024Observed: 5.11 ft at 6:00PM Mar 16, 2024Observed: 5.11 ft at 6:15PM Mar 16, 2024Observed: 5.11 ft at 6:30PM Mar 16, 2024Observed: 5.12 ft at 6:45PM Mar 16, 2024Observed: 5.1 ft at 7:00PM Mar 16, 2024Observed: 5.11 ft at 7:15PM Mar 16, 2024Observed: 5.1 ft at 7:30PM Mar 16, 2024Observed: 5.09 ft at 7:45PM Mar 16, 2024Observed: 5.1 ft at 8:00PM Mar 16, 2024Observed: 5.1 ft at 8:15PM Mar 16, 2024Observed: 5.1 ft at 8:30PM Mar 16, 2024Observed: 5.09 ft at 8:45PM Mar 16, 2024Observed: 5.09 ft at 9:00PM Mar 16, 2024Observed: 5.09 ft at 9:15PM Mar 16, 2024Observed: 5.09 ft at 9:30PM Mar 16, 2024Observed: 5.08 ft at 9:45PM Mar 16, 2024Observed: 5.08 ft at 10:00PM Mar 16, 2024Observed: 5.08 ft at 10:15PM Mar 16, 2024Observed: 5.08 ft at 10:30PM Mar 16, 2024Observed: 5.08 ft at 10:45PM Mar 16, 2024Observed: 5.07 ft at 11:00PM Mar 16, 2024Observed: 5.07 ft at 11:15PM Mar 16, 2024Observed: 5.07 ft at 11:30PM Mar 16, 2024Observed: 5.07 ft at 11:45PM Mar 16, 2024Observed: 5.06 ft at 12:00AM Mar 17, 2024Observed: 5.07 ft at 12:15AM Mar 17, 2024Observed: 5.06 ft at 12:30AM Mar 17, 2024Observed: 5.06 ft at 12:45AM Mar 17, 2024Observed: 5.05 ft at 1:00AM Mar 17, 2024Observed: 5.06 ft at 1:15AM Mar 17, 2024Observed: 5.05 ft at 1:30AM Mar 17, 2024Observed: 5.05 ft at 1:45AM Mar 17, 2024Observed: 5.05 ft at 2:00AM Mar 17, 2024Observed: 5.04 ft at 2:15AM Mar 17, 2024Observed: 5.04 ft at 2:30AM Mar 17, 2024Observed: 5.04 ft at 2:45AM Mar 17, 2024Observed: 5.02 ft at 3:00AM Mar 17, 2024Observed: 5.03 ft at 3:15AM Mar 17, 2024Observed: 5.03 ft at 3:30AM Mar 17, 2024Observed: 5.02 ft at 3:45AM Mar 17, 2024Observed: 5.02 ft at 4:00AM Mar 17, 2024Observed: 5.01 ft at 4:15AM Mar 17, 2024Observed: 5.01 ft at 4:30AM Mar 17, 2024Observed: 5.01 ft at 4:45AM Mar 17, 2024Observed: 4.99 ft at 5:00AM Mar 17, 2024Observed: 4.99 ft at 5:15AM Mar 17, 2024Observed: 5 ft at 5:30AM Mar 17, 2024Observed: 4.98 ft at 5:45AM Mar 17, 2024Observed: 4.99 ft at 6:00AM Mar 17, 2024Observed: 4.98 ft at 6:15AM Mar 17, 2024Observed: 4.97 ft at 6:30AM Mar 17, 2024Observed: 4.97 ft at 6:45AM Mar 17, 2024Observed: 4.97 ft at 7:00AM Mar 17, 2024Observed: 4.98 ft at 7:15AM Mar 17, 2024Observed: 4.96 ft at 7:30AM Mar 17, 2024Observed: 4.96 ft at 7:45AM Mar 17, 2024Observed: 4.96 ft at 8:00AM Mar 17, 2024Observed: 4.95 ft at 8:15AM Mar 17, 2024Observed: 4.94 ft at 8:30AM Mar 17, 2024Observed: 4.94 ft at 8:45AM Mar 17, 2024Observed: 4.94 ft at 9:00AM Mar 17, 2024Observed: 4.94 ft at 9:15AM Mar 17, 2024Observed: 4.93 ft at 9:30AM Mar 17, 2024Observed: 4.93 ft at 9:45AM Mar 17, 2024Observed: 4.92 ft at 10:00AM Mar 17, 2024Observed: 4.92 ft at 10:15AM Mar 17, 2024Observed: 4.92 ft at 10:30AM Mar 17, 2024Observed: 4.91 ft at 10:45AM Mar 17, 2024Observed: 4.91 ft at 11:00AM Mar 17, 2024Observed: 4.91 ft at 11:15AM Mar 17, 2024Observed: 4.9 ft at 11:30AM Mar 17, 2024Observed: 4.91 ft at 11:45AM Mar 17, 2024Observed: 4.89 ft at 12:00PM Mar 17, 2024Observed: 4.88 ft at 12:15PM Mar 17, 2024Observed: 4.89 ft at 12:30PM Mar 17, 2024Observed: 4.88 ft at 12:45PM Mar 17, 2024Observed: 4.88 ft at 1:00PM Mar 17, 2024Observed: 4.88 ft at 1:15PM Mar 17, 2024Observed: 4.88 ft at 1:30PM Mar 17, 2024Observed: 4.86 ft at 1:45PM Mar 17, 2024Observed: 4.85 ft at 2:00PM Mar 17, 2024Observed: 4.86 ft at 2:15PM Mar 17, 2024Observed: 4.85 ft at 2:30PM Mar 17, 2024Observed: 4.84 ft at 2:45PM Mar 17, 2024Observed: 4.82 ft at 3:00PM Mar 17, 2024Observed: 4.83 ft at 3:15PM Mar 17, 2024Observed: 4.82 ft at 3:30PM Mar 17, 2024Observed: 4.83 ft at 3:45PM Mar 17, 2024Observed: 4.82 ft at 4:00PM Mar 17, 2024Observed: 4.81 ft at 4:15PM Mar 17, 2024Observed: 4.8 ft at 4:30PM Mar 17, 2024Observed: 4.79 ft at 4:45PM Mar 17, 2024Observed: 4.79 ft at 5:00PM Mar 17, 2024Observed: 4.79 ft at 5:15PM Mar 17, 2024Observed: 4.78 ft at 5:30PM Mar 17, 2024Observed: 4.77 ft at 5:45PM Mar 17, 2024Observed: 4.77 ft at 6:00PM Mar 17, 2024Observed: 4.77 ft at 6:15PM Mar 17, 2024Observed: 4.76 ft at 6:30PM Mar 17, 2024Observed: 4.74 ft at 6:45PM Mar 17, 2024Observed: 4.74 ft at 7:00PM Mar 17, 2024Observed: 4.72 ft at 7:15PM Mar 17, 2024Observed: 4.72 ft at 7:30PM Mar 17, 2024Observed: 4.71 ft at 7:45PM Mar 17, 2024Observed: 4.71 ft at 8:00PM Mar 17, 2024Observed: 4.7 ft at 8:15PM Mar 17, 2024Observed: 4.7 ft at 8:30PM Mar 17, 2024Observed: 4.7 ft at 8:45PM Mar 17, 2024Observed: 4.69 ft at 9:00PM Mar 17, 2024Observed: 4.69 ft at 9:15PM Mar 17, 2024Observed: 4.68 ft at 9:30PM Mar 17, 2024Observed: 4.67 ft at 9:45PM Mar 17, 2024Observed: 4.67 ft at 10:00PM Mar 17, 2024Observed: 4.68 ft at 10:15PM Mar 17, 2024Observed: 4.67 ft at 10:30PM Mar 17, 2024Observed: 4.68 ft at 10:45PM Mar 17, 2024Observed: 4.66 ft at 11:00PM Mar 17, 2024Observed: 4.66 ft at 11:15PM Mar 17, 2024Observed: 4.66 ft at 11:30PM Mar 17, 2024Observed: 4.66 ft at 11:45PM Mar 17, 2024Observed: 4.66 ft at 12:00AM Mar 18, 2024Observed: 4.65 ft at 12:15AM Mar 18, 2024Observed: 4.65 ft at 12:30AM Mar 18, 2024Observed: 4.64 ft at 12:45AM Mar 18, 2024Observed: 4.64 ft at 1:00AM Mar 18, 2024Observed: 4.63 ft at 1:15AM Mar 18, 2024Observed: 4.64 ft at 1:30AM Mar 18, 2024Observed: 4.63 ft at 1:45AM Mar 18, 2024Observed: 4.63 ft at 2:00AM Mar 18, 2024Observed: 4.63 ft at 2:15AM Mar 18, 2024Observed: 4.63 ft at 2:30AM Mar 18, 2024Observed: 4.63 ft at 2:45AM Mar 18, 2024Observed: 4.63 ft at 3:00AM Mar 18, 2024Observed: 4.62 ft at 3:15AM Mar 18, 2024Observed: 4.63 ft at 3:30AM Mar 18, 2024Observed: 4.61 ft at 3:45AM Mar 18, 2024Observed: 4.61 ft at 4:00AM Mar 18, 2024Observed: 4.61 ft at 4:15AM Mar 18, 2024Observed: 4.6 ft at 4:30AM Mar 18, 2024Observed: 4.59 ft at 4:45AM Mar 18, 2024Observed: 4.58 ft at 5:00AM Mar 18, 2024Observed: 4.58 ft at 5:15AM Mar 18, 2024Observed: 4.58 ft at 5:30AM Mar 18, 2024Observed: 4.57 ft at 5:45AM Mar 18, 2024Observed: 4.56 ft at 6:00AM Mar 18, 2024Observed: 4.57 ft at 6:15AM Mar 18, 2024Observed: 4.56 ft at 6:30AM Mar 18, 2024Observed: 4.55 ft at 6:45AM Mar 18, 2024Observed: 4.55 ft at 7:00AM Mar 18, 2024Observed: 4.55 ft at 7:15AM Mar 18, 2024Observed: 4.54 ft at 7:30AM Mar 18, 2024Observed: 4.55 ft at 7:45AM Mar 18, 2024Observed: 4.54 ft at 8:00AM Mar 18, 2024Observed: 4.54 ft at 8:15AM Mar 18, 2024Observed: 4.53 ft at 8:30AM Mar 18, 2024Observed: 4.53 ft at 8:45AM Mar 18, 2024Observed: 4.52 ft at 9:00AM Mar 18, 2024Observed: 4.52 ft at 9:15AM Mar 18, 2024Observed: 4.51 ft at 9:30AM Mar 18, 2024Observed: 4.51 ft at 9:45AM Mar 18, 2024Observed: 4.51 ft at 10:00AM Mar 18, 2024Observed: 4.51 ft at 10:15AM Mar 18, 2024Observed: 4.5 ft at 10:30AM Mar 18, 2024Observed: 4.5 ft at 10:45AM Mar 18, 2024Observed: 4.49 ft at 11:00AM Mar 18, 2024Observed: 4.5 ft at 11:15AM Mar 18, 2024Observed: 4.49 ft at 11:30AM Mar 18, 2024Observed: 4.49 ft at 11:45AM Mar 18, 2024Observed: 4.48 ft at 12:00PM Mar 18, 2024Observed: 4.47 ft at 12:15PM Mar 18, 2024Observed: 4.47 ft at 12:30PM Mar 18, 2024Observed: 4.46 ft at 12:45PM Mar 18, 2024Observed: 4.47 ft at 1:00PM Mar 18, 2024Observed: 4.47 ft at 1:15PM Mar 18, 2024Observed: 4.48 ft at 1:30PM Mar 18, 2024Observed: 4.49 ft at 1:45PM Mar 18, 2024Observed: 4.49 ft at 2:00PM Mar 18, 2024Observed: 4.49 ft at 2:15PM Mar 18, 2024Observed: 4.48 ft at 2:30PM Mar 18, 2024Observed: 4.47 ft at 2:45PM Mar 18, 2024Observed: 4.48 ft at 3:00PM Mar 18, 2024Observed: 4.47 ft at 3:15PM Mar 18, 2024Observed: 4.46 ft at 3:30PM Mar 18, 2024Observed: 4.45 ft at 3:45PM Mar 18, 2024Observed: 4.44 ft at 4:00PM Mar 18, 2024Observed: 4.44 ft at 4:15PM Mar 18, 2024Observed: 4.43 ft at 4:30PM Mar 18, 2024Observed: 4.43 ft at 4:45PM Mar 18, 2024Observed: 4.42 ft at 5:00PM Mar 18, 2024Observed: 4.41 ft at 5:15PM Mar 18, 2024Observed: 4.4 ft at 5:30PM Mar 18, 2024Observed: 4.4 ft at 5:45PM Mar 18, 2024Observed: 4.39 ft at 6:00PM Mar 18, 2024Observed: 4.38 ft at 6:15PM Mar 18, 2024Observed: 4.38 ft at 6:30PM Mar 18, 2024Observed: 4.38 ft at 6:45PM Mar 18, 2024Observed: 4.37 ft at 7:00PM Mar 18, 2024Observed: 4.36 ft at 7:15PM Mar 18, 2024Observed: 4.37 ft at 7:30PM Mar 18, 2024Observed: 4.37 ft at 7:45PM Mar 18, 2024Observed: 4.36 ft at 8:00PM Mar 18, 2024Observed: 4.35 ft at 8:15PM Mar 18, 2024Observed: 4.35 ft at 8:30PM Mar 18, 2024Observed: 4.34 ft at 8:45PM Mar 18, 2024Observed: 4.34 ft at 9:00PM Mar 18, 2024Observed: 4.33 ft at 9:15PM Mar 18, 2024Observed: 4.33 ft at 9:30PM Mar 18, 2024Observed: 4.34 ft at 9:45PM Mar 18, 2024Highest Forecast: 4.2 ft 2:00AM Mar 19, 2024Forecast: 4.1 ft 8:00AM Mar 19, 2024Forecast: 4.1 ft 2:00PM Mar 19, 2024Forecast: 4 ft 8:00PM Mar 19, 2024Forecast: 3.9 ft 2:00AM Mar 20, 2024Forecast: 3.9 ft 8:00AM Mar 20, 2024Forecast: 3.8 ft 2:00PM Mar 20, 2024Forecast: 3.7 ft 8:00PM Mar 20, 2024Forecast: 3.7 ft 2:00AM Mar 21, 2024Forecast: 3.6 ft 8:00AM Mar 21, 2024USGS--Water Resources of the United StatesPORM2(plotting HGIRG) Graph Created (10:41PM Mar 18, 2024)ObservedForecast (issued 9:39AM Mar 18)Latest observed value: 4.34 ft at 9:45 PM EDT 18-Mar-2024. Flood Stage is 16 ft
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About this graph
Tabular Data (UTC)
Tabular Data (EDT)
XML Data
RSS Files
Datum: Not Available
Metadata
NOTE: Forecasts for the Potomac River at Point of Rocks are issued routinely year-round.
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Upstream Gauge - at Harpers Ferry Upstream Gauge Downstream Gauge Downstream Gauge - at Edwards Ferry
Flood Categories (in feet)
Major Flood Stage: 27
Moderate Flood Stage: 20
Flood Stage: 16
Action Stage: 11
Low Stage (in feet): -9999

Historic Crests
(1) 41.03 ft on 03/19/1936
(2) 40.43 ft on 10/16/1942
(3) 40.20 ft on 06/02/1889
(4) 37.43 ft on 06/23/1972
(5) 36.34 ft on 01/21/1996
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 18.29 ft on 05/09/2022 (P)
(2) 16.39 ft on 03/02/2021
(3) 22.40 ft on 12/17/2018
(4) 21.39 ft on 09/29/2018
(5) 19.92 ft on 09/11/2018
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 0.30 ft on 09/11/1966

For more information on your flood risk go to www.floodsmart.gov.

Zoom Level:14
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Gauge LocationGauge Map Marker
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 Collapse
If you notice any errors in the below information, please contact our Webmaster
40 Water reaches the lowest portion of the city of Brunswick, above the railroad tracks.
35 The MARC station in Point of Rocks is flooded. At least two feet of water covers much of Maryland State Route 28 in the city. Water begins to enter homes and businesses in Point of Rocks along Route 28.
32 Water covers Maryland State Route 28 in Point of Rocks near the MARC station.
31 Water reaches the MARC parking lot at Brunswick.
30 Water reaches a home on the Loudoun County side of the river near Point of Rocks. Water also reaches the Brunswick train yard and covers portions of the MARC parking lot at Point of Rocks, and covers Old Commerce Street in Point of Rocks.
29 Water completely covers the comfort station at the Point of Rocks boat ramp.
27 Water covers a large section of the C&O Canal towpath in Frederick County, Maryland. Water also reaches the railroad tracks at Point of Rocks.
25 Water reaches outbuildings on the Loudoun County side of the river near Point of Rocks.
23 Floodwaters completely cover the comfort station at the Brunswick boat ramp, and reach the comfort station at the Point of Rocks boat ramp. The upper parking lot at the Point of Rocks boat ramp begins to flood.
22 Water begins to cover the C&O Canal towpath near Point of Rocks and Brunswick.
20 The boat ramp and lower parking lot at Point of Rocks are flooded. Water approaches the water treatment plant in Brunswick. Farmland behind the Tarara Vineyard is flooded.
18 Water approaches structures at the Brunswick campground.
17 Water enters the comfort station at the Brunswick boat ramp parking area.
16 The parking lots at both the McKimmey and Brunswick boat ramps begin to flood. Flooding of an agricultural field adjacent to the McKimmey boat ramp is occurring. About half the lower parking lot of the Point of Rocks boat ramp is also flooded.
15 Several lowland forested areas, mainly on islands, begin to flood.
14 Water completely covers the Nolands Ferry boat ramp and begins to flood the parking lot nearby.
13 Water begins to cover low lying areas within the Brunswick campground.
12.5 The Point of Rocks boat ramp is completely covered by water, and water begins to affect the lower parking lot nearby.
11 Water covers the parking lot of the Lander boat ramp. Campers and other recreational interests should begin to move away from the river.
5.5 The river reaches danger level for boaters, as defined by the State of Maryland. Conditions are extremely hazardous.
2 The river reaches caution level for boaters, as defined by the State of Maryland. Fast moving water and changing currents can be expected.
Photos
(1) USGS Wellhouse Adjacent to US Route 15 at Point of Rocks
(2) Staff Gage Being Installed in 1993 on US Route 15 Bridge Support Beam
(3) Looking Upstream at Paton Island from US 15 Bridge
(4) Railroad Tunnel Just Above Gage on Maryland Side of Potomac
About This Location Collapse

Latitude: 39.273611° N, Longitude: 77.543056° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 16 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 29 200.63 ft 216.63 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) 7 Day (NAEFS) 7 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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Page last modified: 2-Nov-2020 7:30 PM
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