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Hydrograph River at a Glance Download
Potomac River at Hancock Stage (ft)Flow (kcfs)Highest Observation: 5.63 ft at 11:00PM May 21, 2022Highest Observation: 5.63 ft at 11:15PM May 21, 2022Observed: 5.62 ft at 11:30PM May 21, 2022Observed: 5.62 ft at 11:45PM May 21, 2022Observed: 5.62 ft at 12:00AM May 22, 2022Observed: 5.61 ft at 12:15AM May 22, 2022Observed: 5.61 ft at 12:16AM May 22, 2022Observed: 5.61 ft at 12:30AM May 22, 2022Observed: 5.6 ft at 12:45AM May 22, 2022Observed: 5.6 ft at 1:00AM May 22, 2022Observed: 5.59 ft at 1:15AM May 22, 2022Observed: 5.59 ft at 1:30AM May 22, 2022Observed: 5.59 ft at 1:45AM May 22, 2022Observed: 5.58 ft at 2:00AM May 22, 2022Observed: 5.58 ft at 2:15AM May 22, 2022Observed: 5.57 ft at 2:30AM May 22, 2022Observed: 5.57 ft at 2:45AM May 22, 2022Observed: 5.56 ft at 3:00AM May 22, 2022Observed: 5.56 ft at 3:15AM May 22, 2022Observed: 5.55 ft at 3:30AM May 22, 2022Observed: 5.55 ft at 3:45AM May 22, 2022Observed: 5.54 ft at 4:00AM May 22, 2022Observed: 5.54 ft at 4:15AM May 22, 2022Observed: 5.53 ft at 4:30AM May 22, 2022Observed: 5.53 ft at 4:45AM May 22, 2022Observed: 5.52 ft at 5:00AM May 22, 2022Observed: 5.52 ft at 5:15AM May 22, 2022Observed: 5.51 ft at 5:30AM May 22, 2022Observed: 5.51 ft at 5:45AM May 22, 2022Observed: 5.51 ft at 6:00AM May 22, 2022Observed: 5.5 ft at 6:15AM May 22, 2022Observed: 5.5 ft at 6:30AM May 22, 2022Observed: 5.49 ft at 6:45AM May 22, 2022Observed: 5.49 ft at 7:00AM May 22, 2022Observed: 5.48 ft at 7:15AM May 22, 2022Observed: 5.48 ft at 7:30AM May 22, 2022Observed: 5.48 ft at 7:45AM May 22, 2022Observed: 5.47 ft at 8:00AM May 22, 2022Observed: 5.47 ft at 8:15AM May 22, 2022Observed: 5.46 ft at 8:30AM May 22, 2022Observed: 5.46 ft at 8:31AM May 22, 2022Observed: 5.45 ft at 8:45AM May 22, 2022Observed: 5.45 ft at 9:00AM May 22, 2022Observed: 5.44 ft at 9:15AM May 22, 2022Observed: 5.44 ft at 9:30AM May 22, 2022Observed: 5.43 ft at 9:45AM May 22, 2022Observed: 5.43 ft at 10:00AM May 22, 2022Observed: 5.42 ft at 10:15AM May 22, 2022Observed: 5.42 ft at 10:30AM May 22, 2022Observed: 5.41 ft at 10:45AM May 22, 2022Observed: 5.41 ft at 11:00AM May 22, 2022Observed: 5.4 ft at 11:15AM May 22, 2022Observed: 5.4 ft at 11:30AM May 22, 2022Observed: 5.39 ft at 11:45AM May 22, 2022Observed: 5.39 ft at 12:00PM May 22, 2022Observed: 5.38 ft at 12:15PM May 22, 2022Observed: 5.38 ft at 12:30PM May 22, 2022Observed: 5.38 ft at 12:45PM May 22, 2022Observed: 5.37 ft at 1:00PM May 22, 2022Observed: 5.37 ft at 1:15PM May 22, 2022Observed: 5.36 ft at 1:30PM May 22, 2022Observed: 5.36 ft at 1:45PM May 22, 2022Observed: 5.35 ft at 2:00PM May 22, 2022Observed: 5.35 ft at 2:15PM May 22, 2022Observed: 5.35 ft at 2:30PM May 22, 2022Observed: 5.34 ft at 2:45PM May 22, 2022Observed: 5.34 ft at 3:00PM May 22, 2022Observed: 5.33 ft at 3:15PM May 22, 2022Observed: 5.33 ft at 3:30PM May 22, 2022Observed: 5.33 ft at 3:45PM May 22, 2022Observed: 5.32 ft at 4:00PM May 22, 2022Observed: 5.32 ft at 4:15PM May 22, 2022Observed: 5.31 ft at 4:30PM May 22, 2022Observed: 5.31 ft at 4:31PM May 22, 2022Observed: 5.31 ft at 4:45PM May 22, 2022Observed: 5.31 ft at 5:00PM May 22, 2022Observed: 5.31 ft at 5:15PM May 22, 2022Observed: 5.31 ft at 5:30PM May 22, 2022Observed: 5.31 ft at 5:45PM May 22, 2022Observed: 5.31 ft at 6:00PM May 22, 2022Observed: 5.31 ft at 6:15PM May 22, 2022Observed: 5.32 ft at 6:30PM May 22, 2022Observed: 5.32 ft at 6:45PM May 22, 2022Observed: 5.33 ft at 7:00PM May 22, 2022Observed: 5.33 ft at 7:15PM May 22, 2022Observed: 5.34 ft at 7:30PM May 22, 2022Observed: 5.34 ft at 7:45PM May 22, 2022Observed: 5.35 ft at 8:00PM May 22, 2022Observed: 5.36 ft at 8:15PM May 22, 2022Observed: 5.37 ft at 8:30PM May 22, 2022Observed: 5.37 ft at 8:45PM May 22, 2022Observed: 5.38 ft at 9:00PM May 22, 2022Observed: 5.39 ft at 9:15PM May 22, 2022Observed: 5.39 ft at 9:30PM May 22, 2022Observed: 5.4 ft at 9:45PM May 22, 2022Observed: 5.41 ft at 10:00PM May 22, 2022Observed: 5.41 ft at 10:15PM May 22, 2022Observed: 5.41 ft at 10:30PM May 22, 2022Observed: 5.42 ft at 10:45PM May 22, 2022Observed: 5.42 ft at 11:00PM May 22, 2022Observed: 5.42 ft at 11:15PM May 22, 2022Observed: 5.42 ft at 11:30PM May 22, 2022Observed: 5.42 ft at 11:45PM May 22, 2022Observed: 5.42 ft at 12:00AM May 23, 2022Observed: 5.42 ft at 12:15AM May 23, 2022Observed: 5.42 ft at 12:30AM May 23, 2022Observed: 5.42 ft at 12:31AM May 23, 2022Observed: 5.42 ft at 12:45AM May 23, 2022Observed: 5.41 ft at 1:00AM May 23, 2022Observed: 5.41 ft at 1:15AM May 23, 2022Observed: 5.4 ft at 1:30AM May 23, 2022Observed: 5.4 ft at 1:45AM May 23, 2022Observed: 5.39 ft at 2:00AM May 23, 2022Observed: 5.39 ft at 2:15AM May 23, 2022Observed: 5.38 ft at 2:30AM May 23, 2022Observed: 5.37 ft at 2:45AM May 23, 2022Observed: 5.36 ft at 3:00AM May 23, 2022Observed: 5.36 ft at 3:15AM May 23, 2022Observed: 5.35 ft at 3:30AM May 23, 2022Observed: 5.34 ft at 3:45AM May 23, 2022Observed: 5.33 ft at 4:00AM May 23, 2022Observed: 5.32 ft at 4:15AM May 23, 2022Observed: 5.32 ft at 4:30AM May 23, 2022Observed: 5.31 ft at 4:45AM May 23, 2022Observed: 5.3 ft at 5:00AM May 23, 2022Observed: 5.29 ft at 5:15AM May 23, 2022Observed: 5.28 ft at 5:30AM May 23, 2022Observed: 5.27 ft at 5:45AM May 23, 2022Observed: 5.26 ft at 6:00AM May 23, 2022Observed: 5.26 ft at 6:15AM May 23, 2022Observed: 5.25 ft at 6:30AM May 23, 2022Observed: 5.24 ft at 6:45AM May 23, 2022Observed: 5.23 ft at 7:00AM May 23, 2022Observed: 5.22 ft at 7:15AM May 23, 2022Observed: 5.22 ft at 7:30AM May 23, 2022Observed: 5.21 ft at 7:45AM May 23, 2022Observed: 5.2 ft at 8:00AM May 23, 2022Observed: 5.2 ft at 8:15AM May 23, 2022Observed: 5.19 ft at 8:30AM May 23, 2022Observed: 5.19 ft at 8:31AM May 23, 2022Observed: 5.19 ft at 8:45AM May 23, 2022Observed: 5.18 ft at 9:00AM May 23, 2022Observed: 5.18 ft at 9:15AM May 23, 2022Observed: 5.18 ft at 9:30AM May 23, 2022Observed: 5.18 ft at 9:45AM May 23, 2022Observed: 5.17 ft at 10:00AM May 23, 2022Observed: 5.17 ft at 10:15AM May 23, 2022Observed: 5.17 ft at 10:30AM May 23, 2022Observed: 5.17 ft at 10:45AM May 23, 2022Observed: 5.17 ft at 11:00AM May 23, 2022Observed: 5.16 ft at 11:15AM May 23, 2022Observed: 5.16 ft at 11:30AM May 23, 2022Observed: 5.16 ft at 11:45AM May 23, 2022Observed: 5.16 ft at 12:00PM May 23, 2022Observed: 5.16 ft at 12:15PM May 23, 2022Observed: 5.16 ft at 12:30PM May 23, 2022Observed: 5.16 ft at 12:45PM May 23, 2022Observed: 5.16 ft at 1:00PM May 23, 2022Observed: 5.16 ft at 1:15PM May 23, 2022Observed: 5.16 ft at 1:30PM May 23, 2022Observed: 5.16 ft at 1:45PM May 23, 2022Observed: 5.16 ft at 2:00PM May 23, 2022Observed: 5.16 ft at 2:15PM May 23, 2022Observed: 5.16 ft at 2:30PM May 23, 2022Observed: 5.16 ft at 2:45PM May 23, 2022Observed: 5.16 ft at 3:00PM May 23, 2022Observed: 5.16 ft at 3:15PM May 23, 2022Observed: 5.16 ft at 3:30PM May 23, 2022Observed: 5.16 ft at 3:45PM May 23, 2022Observed: 5.16 ft at 4:00PM May 23, 2022Observed: 5.16 ft at 4:15PM May 23, 2022Observed: 5.16 ft at 4:30PM May 23, 2022Observed: 5.16 ft at 4:45PM May 23, 2022Observed: 5.16 ft at 5:00PM May 23, 2022Observed: 5.16 ft at 5:15PM May 23, 2022Observed: 5.16 ft at 5:30PM May 23, 2022Observed: 5.16 ft at 5:45PM May 23, 2022Observed: 5.16 ft at 6:00PM May 23, 2022Observed: 5.16 ft at 6:15PM May 23, 2022Observed: 5.16 ft at 6:30PM May 23, 2022Observed: 5.16 ft at 6:45PM May 23, 2022Observed: 5.16 ft at 7:00PM May 23, 2022Observed: 5.17 ft at 7:15PM May 23, 2022Observed: 5.17 ft at 7:30PM May 23, 2022Observed: 5.18 ft at 7:45PM May 23, 2022Observed: 5.18 ft at 8:00PM May 23, 2022Observed: 5.19 ft at 8:15PM May 23, 2022Observed: 5.2 ft at 8:30PM May 23, 2022Observed: 5.2 ft at 8:45PM May 23, 2022Observed: 5.21 ft at 9:00PM May 23, 2022Observed: 5.22 ft at 9:15PM May 23, 2022Observed: 5.23 ft at 9:30PM May 23, 2022Observed: 5.23 ft at 9:45PM May 23, 2022Observed: 5.23 ft at 10:00PM May 23, 2022Observed: 5.23 ft at 10:15PM May 23, 2022Observed: 5.24 ft at 10:30PM May 23, 2022Observed: 5.25 ft at 10:45PM May 23, 2022Observed: 5.25 ft at 11:00PM May 23, 2022Observed: 5.26 ft at 11:15PM May 23, 2022Observed: 5.26 ft at 11:30PM May 23, 2022Observed: 5.27 ft at 11:45PM May 23, 2022Observed: 5.27 ft at 12:00AM May 24, 2022Observed: 5.27 ft at 12:15AM May 24, 2022Observed: 5.27 ft at 12:30AM May 24, 2022Observed: 5.27 ft at 12:31AM May 24, 2022Observed: 5.27 ft at 12:45AM May 24, 2022Observed: 5.27 ft at 1:00AM May 24, 2022Observed: 5.27 ft at 1:15AM May 24, 2022Observed: 5.27 ft at 1:30AM May 24, 2022Observed: 5.26 ft at 1:45AM May 24, 2022Observed: 5.26 ft at 2:00AM May 24, 2022Observed: 5.25 ft at 2:15AM May 24, 2022Observed: 5.25 ft at 2:30AM May 24, 2022Observed: 5.24 ft at 2:45AM May 24, 2022Observed: 5.24 ft at 3:00AM May 24, 2022Observed: 5.24 ft at 3:15AM May 24, 2022Observed: 5.23 ft at 3:30AM May 24, 2022Observed: 5.22 ft at 3:45AM May 24, 2022Observed: 5.22 ft at 4:00AM May 24, 2022Observed: 5.21 ft at 4:15AM May 24, 2022Observed: 5.2 ft at 4:30AM May 24, 2022Observed: 5.2 ft at 4:45AM May 24, 2022Observed: 5.19 ft at 5:00AM May 24, 2022Observed: 5.18 ft at 5:15AM May 24, 2022Observed: 5.18 ft at 5:30AM May 24, 2022Observed: 5.17 ft at 5:45AM May 24, 2022Observed: 5.16 ft at 6:00AM May 24, 2022Observed: 5.16 ft at 6:15AM May 24, 2022Observed: 5.15 ft at 6:30AM May 24, 2022Observed: 5.15 ft at 6:45AM May 24, 2022Observed: 5.14 ft at 7:00AM May 24, 2022Observed: 5.14 ft at 7:15AM May 24, 2022Observed: 5.14 ft at 7:30AM May 24, 2022Observed: 5.13 ft at 7:45AM May 24, 2022Observed: 5.12 ft at 8:00AM May 24, 2022Observed: 5.12 ft at 8:15AM May 24, 2022Observed: 5.11 ft at 8:30AM May 24, 2022Observed: 5.11 ft at 8:31AM May 24, 2022Observed: 5.1 ft at 8:45AM May 24, 2022Observed: 5.1 ft at 9:00AM May 24, 2022Observed: 5.09 ft at 9:15AM May 24, 2022Observed: 5.08 ft at 9:30AM May 24, 2022Observed: 5.08 ft at 9:45AM May 24, 2022Observed: 5.08 ft at 10:00AM May 24, 2022Observed: 5.07 ft at 10:15AM May 24, 2022Observed: 5.07 ft at 10:30AM May 24, 2022Observed: 5.06 ft at 10:45AM May 24, 2022Observed: 5.06 ft at 11:00AM May 24, 2022Observed: 5.05 ft at 11:15AM May 24, 2022Observed: 5.05 ft at 11:30AM May 24, 2022Observed: 5.05 ft at 11:45AM May 24, 2022Observed: 5.04 ft at 12:00PM May 24, 2022Observed: 5.04 ft at 12:15PM May 24, 2022Observed: 5.03 ft at 12:30PM May 24, 2022Observed: 5.03 ft at 12:45PM May 24, 2022Observed: 5.03 ft at 1:00PM May 24, 2022Observed: 5.02 ft at 1:15PM May 24, 2022Observed: 5.02 ft at 1:30PM May 24, 2022Observed: 5.02 ft at 1:45PM May 24, 2022Observed: 5.01 ft at 2:00PM May 24, 2022Observed: 5.01 ft at 2:15PM May 24, 2022Observed: 5 ft at 2:30PM May 24, 2022Observed: 5 ft at 2:45PM May 24, 2022Observed: 5 ft at 3:00PM May 24, 2022Observed: 4.99 ft at 3:15PM May 24, 2022Observed: 4.99 ft at 3:30PM May 24, 2022Observed: 4.99 ft at 3:45PM May 24, 2022Observed: 4.98 ft at 4:00PM May 24, 2022Observed: 4.98 ft at 4:15PM May 24, 2022Observed: 4.98 ft at 4:30PM May 24, 2022Observed: 4.98 ft at 4:31PM May 24, 2022Observed: 4.98 ft at 4:45PM May 24, 2022Observed: 4.97 ft at 5:00PM May 24, 2022Observed: 4.97 ft at 5:15PM May 24, 2022Observed: 4.97 ft at 5:30PM May 24, 2022Observed: 4.97 ft at 5:45PM May 24, 2022Observed: 4.97 ft at 6:00PM May 24, 2022Observed: 4.96 ft at 6:15PM May 24, 2022Observed: 4.96 ft at 6:30PM May 24, 2022Observed: 4.96 ft at 6:45PM May 24, 2022Observed: 4.95 ft at 7:00PM May 24, 2022Observed: 4.95 ft at 7:15PM May 24, 2022Observed: 4.95 ft at 7:30PM May 24, 2022Observed: 4.95 ft at 7:45PM May 24, 2022Observed: 4.95 ft at 8:00PM May 24, 2022Observed: 4.94 ft at 8:15PM May 24, 2022Observed: 4.94 ft at 8:30PM May 24, 2022Observed: 4.94 ft at 8:45PM May 24, 2022Observed: 4.94 ft at 9:00PM May 24, 2022Observed: 4.94 ft at 9:15PM May 24, 2022Observed: 4.93 ft at 9:30PM May 24, 2022Observed: 4.92 ft at 9:45PM May 24, 2022Observed: 4.92 ft at 10:00PM May 24, 2022Observed: 4.92 ft at 10:15PM May 24, 2022Observed: 4.92 ft at 10:30PM May 24, 2022Observed: 4.92 ft at 10:45PM May 24, 2022Observed: 4.91 ft at 11:00PM May 24, 2022Observed: 4.91 ft at 11:15PM May 24, 2022Observed: 4.91 ft at 11:30PM May 24, 2022Observed: 4.91 ft at 11:45PM May 24, 2022Observed: 4.9 ft at 12:00AM May 25, 2022Observed: 4.9 ft at 12:15AM May 25, 2022Observed: 4.9 ft at 12:30AM May 25, 2022Observed: 4.9 ft at 12:31AM May 25, 2022Observed: 4.9 ft at 12:45AM May 25, 2022Observed: 4.9 ft at 1:00AM May 25, 2022Observed: 4.9 ft at 1:15AM May 25, 2022Observed: 4.89 ft at 1:30AM May 25, 2022Observed: 4.89 ft at 1:45AM May 25, 2022Observed: 4.89 ft at 2:00AM May 25, 2022Observed: 4.89 ft at 2:15AM May 25, 2022Observed: 4.89 ft at 2:30AM May 25, 2022Observed: 4.89 ft at 2:45AM May 25, 2022Observed: 4.88 ft at 3:00AM May 25, 2022Observed: 4.88 ft at 3:15AM May 25, 2022Observed: 4.88 ft at 3:30AM May 25, 2022Observed: 4.88 ft at 3:45AM May 25, 2022Observed: 4.88 ft at 4:00AM May 25, 2022Observed: 4.88 ft at 4:15AM May 25, 2022Observed: 4.88 ft at 4:30AM May 25, 2022Observed: 4.88 ft at 4:45AM May 25, 2022Observed: 4.88 ft at 5:00AM May 25, 2022Observed: 4.87 ft at 5:15AM May 25, 2022Observed: 4.87 ft at 5:30AM May 25, 2022Observed: 4.87 ft at 5:45AM May 25, 2022Observed: 4.87 ft at 6:00AM May 25, 2022Observed: 4.87 ft at 6:15AM May 25, 2022Observed: 4.87 ft at 6:30AM May 25, 2022Observed: 4.86 ft at 6:45AM May 25, 2022Observed: 4.86 ft at 7:00AM May 25, 2022Observed: 4.86 ft at 7:15AM May 25, 2022Observed: 4.86 ft at 7:30AM May 25, 2022Observed: 4.85 ft at 7:45AM May 25, 2022Observed: 4.85 ft at 8:00AM May 25, 2022Observed: 4.85 ft at 8:15AM May 25, 2022Observed: 4.85 ft at 8:30AM May 25, 2022Observed: 4.85 ft at 8:45AM May 25, 2022Observed: 4.85 ft at 9:00AM May 25, 2022Observed: 4.85 ft at 9:15AM May 25, 2022Observed: 4.85 ft at 9:30AM May 25, 2022Observed: 4.85 ft at 9:45AM May 25, 2022Observed: 4.85 ft at 10:00AM May 25, 2022Observed: 4.85 ft at 10:15AM May 25, 2022Observed: 4.85 ft at 10:30AM May 25, 2022Observed: 4.84 ft at 10:45AM May 25, 2022Observed: 4.84 ft at 11:00AM May 25, 2022Observed: 4.84 ft at 11:15AM May 25, 2022Observed: 4.84 ft at 11:30AM May 25, 2022Observed: 4.84 ft at 11:45AM May 25, 2022Observed: 4.84 ft at 12:00PM May 25, 2022Observed: 4.84 ft at 12:15PM May 25, 2022Observed: 4.84 ft at 12:30PM May 25, 2022Observed: 4.84 ft at 12:45PM May 25, 2022Observed: 4.84 ft at 1:00PM May 25, 2022Observed: 4.84 ft at 1:15PM May 25, 2022Observed: 4.84 ft at 1:30PM May 25, 2022Observed: 4.84 ft at 1:45PM May 25, 2022Observed: 4.84 ft at 2:00PM May 25, 2022Observed: 4.84 ft at 2:15PM May 25, 2022Observed: 4.83 ft at 2:30PM May 25, 2022Observed: 4.83 ft at 2:45PM May 25, 2022Observed: 4.83 ft at 3:00PM May 25, 2022Observed: 4.83 ft at 3:15PM May 25, 2022Observed: 4.83 ft at 3:30PM May 25, 2022Observed: 4.83 ft at 3:45PM May 25, 2022Observed: 4.83 ft at 4:00PM May 25, 2022Observed: 4.83 ft at 4:15PM May 25, 2022Observed: 4.83 ft at 4:30PM May 25, 2022Observed: 4.83 ft at 4:45PM May 25, 2022Observed: 4.83 ft at 4:46PM May 25, 2022Observed: 4.83 ft at 5:00PM May 25, 2022Observed: 4.83 ft at 5:15PM May 25, 2022Observed: 4.83 ft at 5:30PM May 25, 2022Observed: 4.82 ft at 5:45PM May 25, 2022Observed: 4.82 ft at 6:00PM May 25, 2022Observed: 4.82 ft at 6:15PM May 25, 2022Observed: 4.82 ft at 6:30PM May 25, 2022Observed: 4.82 ft at 6:45PM May 25, 2022Observed: 4.82 ft at 7:00PM May 25, 2022Observed: 4.82 ft at 7:15PM May 25, 2022Observed: 4.82 ft at 7:30PM May 25, 2022Observed: 4.82 ft at 7:45PM May 25, 2022Observed: 4.82 ft at 8:00PM May 25, 2022Observed: 4.82 ft at 8:15PM May 25, 2022Observed: 4.82 ft at 8:30PM May 25, 2022Observed: 4.82 ft at 8:45PM May 25, 2022Observed: 4.82 ft at 9:00PM May 25, 2022Observed: 4.82 ft at 9:15PM May 25, 2022Observed: 4.82 ft at 9:30PM May 25, 2022Observed: 4.82 ft at 9:45PM May 25, 2022Observed: 4.82 ft at 10:00PM May 25, 2022Observed: 4.82 ft at 10:15PM May 25, 2022Observed: 4.81 ft at 10:30PM May 25, 2022Observed: 4.81 ft at 10:45PM May 25, 2022Observed: 4.81 ft at 11:00PM May 25, 2022Observed: 4.81 ft at 11:15PM May 25, 2022Observed: 4.81 ft at 11:30PM May 25, 2022Observed: 4.81 ft at 11:45PM May 25, 2022Observed: 4.81 ft at 12:00AM May 26, 2022Observed: 4.81 ft at 12:15AM May 26, 2022Observed: 4.81 ft at 12:30AM May 26, 2022Observed: 4.81 ft at 12:45AM May 26, 2022Observed: 4.81 ft at 1:00AM May 26, 2022Observed: 4.81 ft at 1:15AM May 26, 2022Observed: 4.81 ft at 1:30AM May 26, 2022Observed: 4.81 ft at 1:45AM May 26, 2022Observed: 4.81 ft at 2:00AM May 26, 2022Observed: 4.81 ft at 2:15AM May 26, 2022Observed: 4.81 ft at 2:30AM May 26, 2022Observed: 4.81 ft at 2:45AM May 26, 2022Observed: 4.8 ft at 3:00AM May 26, 2022Observed: 4.8 ft at 3:15AM May 26, 2022Observed: 4.8 ft at 3:30AM May 26, 2022Observed: 4.8 ft at 3:45AM May 26, 2022Observed: 4.8 ft at 4:00AM May 26, 2022Observed: 4.8 ft at 4:15AM May 26, 2022Observed: 4.8 ft at 4:30AM May 26, 2022Observed: 4.8 ft at 4:45AM May 26, 2022Observed: 4.8 ft at 5:00AM May 26, 2022Observed: 4.8 ft at 5:15AM May 26, 2022Observed: 4.8 ft at 5:30AM May 26, 2022Observed: 4.8 ft at 5:45AM May 26, 2022Observed: 4.8 ft at 6:00AM May 26, 2022Observed: 4.8 ft at 6:15AM May 26, 2022Observed: 4.8 ft at 6:30AM May 26, 2022Observed: 4.8 ft at 6:45AM May 26, 2022Observed: 4.8 ft at 7:00AM May 26, 2022Observed: 4.8 ft at 7:15AM May 26, 2022Observed: 4.8 ft at 7:30AM May 26, 2022Observed: 4.8 ft at 7:45AM May 26, 2022Observed: 4.8 ft at 8:00AM May 26, 2022Observed: 4.8 ft at 8:15AM May 26, 2022Observed: 4.81 ft at 8:30AM May 26, 2022Observed: 4.81 ft at 8:45AM May 26, 2022Observed: 4.81 ft at 8:46AM May 26, 2022Observed: 4.81 ft at 9:00AM May 26, 2022Observed: 4.81 ft at 9:15AM May 26, 2022Observed: 4.81 ft at 9:30AM May 26, 2022Observed: 4.81 ft at 9:45AM May 26, 2022Observed: 4.81 ft at 10:00AM May 26, 2022Observed: 4.81 ft at 10:15AM May 26, 2022Observed: 4.81 ft at 10:30AM May 26, 2022Observed: 4.81 ft at 10:45AM May 26, 2022Observed: 4.81 ft at 11:00AM May 26, 2022Observed: 4.81 ft at 11:15AM May 26, 2022Observed: 4.81 ft at 11:30AM May 26, 2022Observed: 4.81 ft at 11:45AM May 26, 2022Observed: 4.81 ft at 12:00PM May 26, 2022Observed: 4.82 ft at 12:15PM May 26, 2022Observed: 4.81 ft at 12:30PM May 26, 2022Observed: 4.82 ft at 12:45PM May 26, 2022Observed: 4.82 ft at 1:00PM May 26, 2022Observed: 4.82 ft at 1:15PM May 26, 2022Observed: 4.82 ft at 1:30PM May 26, 2022Observed: 4.82 ft at 1:45PM May 26, 2022Observed: 4.82 ft at 2:00PM May 26, 2022Observed: 4.82 ft at 2:15PM May 26, 2022Observed: 4.82 ft at 2:30PM May 26, 2022Observed: 4.82 ft at 2:45PM May 26, 2022Observed: 4.82 ft at 3:00PM May 26, 2022Observed: 4.82 ft at 3:15PM May 26, 2022Observed: 4.82 ft at 3:30PM May 26, 2022Observed: 4.82 ft at 3:45PM May 26, 2022Observed: 4.82 ft at 4:00PM May 26, 2022Observed: 4.82 ft at 4:15PM May 26, 2022Observed: 4.82 ft at 4:30PM May 26, 2022Observed: 4.82 ft at 4:45PM May 26, 2022Observed: 4.82 ft at 4:46PM May 26, 2022Observed: 4.82 ft at 5:00PM May 26, 2022Observed: 4.82 ft at 5:15PM May 26, 2022Observed: 4.82 ft at 5:30PM May 26, 2022Observed: 4.82 ft at 5:45PM May 26, 2022Observed: 4.82 ft at 6:00PM May 26, 2022Observed: 4.82 ft at 6:15PM May 26, 2022Observed: 4.82 ft at 6:30PM May 26, 2022Observed: 4.82 ft at 6:45PM May 26, 2022Observed: 4.82 ft at 7:00PM May 26, 2022Observed: 4.82 ft at 7:15PM May 26, 2022Observed: 4.82 ft at 7:30PM May 26, 2022Observed: 4.82 ft at 7:45PM May 26, 2022Observed: 4.82 ft at 8:00PM May 26, 2022Observed: 4.82 ft at 8:15PM May 26, 2022Observed: 4.82 ft at 8:30PM May 26, 2022Observed: 4.81 ft at 8:45PM May 26, 2022Observed: 4.81 ft at 9:00PM May 26, 2022Observed: 4.81 ft at 9:15PM May 26, 2022Observed: 4.81 ft at 9:30PM May 26, 2022Observed: 4.81 ft at 9:45PM May 26, 2022Observed: 4.8 ft at 10:00PM May 26, 2022Observed: 4.8 ft at 10:15PM May 26, 2022Forecast: 4.8 ft 2:00AM May 27, 2022Forecast: 4.8 ft 8:00AM May 27, 2022Forecast: 4.8 ft 2:00PM May 27, 2022Forecast: 4.9 ft 8:00PM May 27, 2022Forecast: 5.2 ft 2:00AM May 28, 2022Forecast: 5.6 ft 8:00AM May 28, 2022Forecast: 6.2 ft 2:00PM May 28, 2022Forecast: 6.8 ft 8:00PM May 28, 2022Highest Forecast: 6.9 ft 2:00AM May 29, 2022Highest Forecast: 6.9 ft 8:00AM May 29, 2022USGS--Water Resources of the United StatesHNKM2(plotting HGIRG) Graph Created (10:55PM May 26, 2022)ObservedForecast (issued 9:37AM May 26)Latest observed value: 4.8 ft at 10:15 PM EDT 26-May-2022. Flood Stage is 25 ft
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Tabular Data (UTC)
Tabular Data (EDT)
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Metadata
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) 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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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
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