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Hydrograph River at a Glance Download
Potomac River at Hancock Stage (ft)Flow (kcfs)Observed: 4.86 ft at 3:00AM May 25, 2017Observed: 4.87 ft at 3:15AM May 25, 2017Observed: 4.87 ft at 3:30AM May 25, 2017Observed: 4.87 ft at 3:45AM May 25, 2017Observed: 4.88 ft at 4:00AM May 25, 2017Observed: 4.88 ft at 4:15AM May 25, 2017Observed: 4.89 ft at 4:30AM May 25, 2017Observed: 4.89 ft at 4:45AM May 25, 2017Observed: 4.89 ft at 5:00AM May 25, 2017Observed: 4.9 ft at 5:15AM May 25, 2017Observed: 4.9 ft at 5:30AM May 25, 2017Observed: 4.9 ft at 5:45AM May 25, 2017Observed: 4.91 ft at 6:00AM May 25, 2017Observed: 4.91 ft at 6:15AM May 25, 2017Observed: 4.92 ft at 6:30AM May 25, 2017Observed: 4.93 ft at 6:45AM May 25, 2017Observed: 4.93 ft at 7:00AM May 25, 2017Observed: 4.94 ft at 7:15AM May 25, 2017Observed: 4.95 ft at 7:30AM May 25, 2017Observed: 4.95 ft at 7:45AM May 25, 2017Observed: 4.95 ft at 8:00AM May 25, 2017Observed: 4.96 ft at 8:15AM May 25, 2017Observed: 4.96 ft at 8:30AM May 25, 2017Observed: 4.97 ft at 8:45AM May 25, 2017Observed: 4.97 ft at 9:00AM May 25, 2017Observed: 4.98 ft at 9:15AM May 25, 2017Observed: 4.98 ft at 9:30AM May 25, 2017Observed: 4.99 ft at 9:45AM May 25, 2017Observed: 5 ft at 10:00AM May 25, 2017Observed: 5 ft at 10:15AM May 25, 2017Observed: 5.01 ft at 10:30AM May 25, 2017Observed: 5.01 ft at 10:45AM May 25, 2017Observed: 5.02 ft at 11:00AM May 25, 2017Observed: 5.03 ft at 11:15AM May 25, 2017Observed: 5.03 ft at 11:30AM May 25, 2017Observed: 5.03 ft at 11:45AM May 25, 2017Observed: 5.04 ft at 12:00PM May 25, 2017Observed: 5.04 ft at 12:15PM May 25, 2017Observed: 5.04 ft at 12:30PM May 25, 2017Observed: 5.05 ft at 12:45PM May 25, 2017Observed: 5.05 ft at 1:00PM May 25, 2017Observed: 5.05 ft at 1:15PM May 25, 2017Observed: 5.05 ft at 1:30PM May 25, 2017Observed: 5.05 ft at 1:45PM May 25, 2017Observed: 5.06 ft at 2:00PM May 25, 2017Observed: 5.06 ft at 2:15PM May 25, 2017Observed: 5.07 ft at 2:30PM May 25, 2017Observed: 5.07 ft at 2:45PM May 25, 2017Observed: 5.07 ft at 3:00PM May 25, 2017Observed: 5.07 ft at 3:15PM May 25, 2017Observed: 5.08 ft at 3:30PM May 25, 2017Observed: 5.09 ft at 3:45PM May 25, 2017Observed: 5.09 ft at 4:00PM May 25, 2017Observed: 5.1 ft at 4:15PM May 25, 2017Observed: 5.1 ft at 4:30PM May 25, 2017Observed: 5.11 ft at 4:45PM May 25, 2017Observed: 5.11 ft at 5:00PM May 25, 2017Observed: 5.12 ft at 5:15PM May 25, 2017Observed: 5.12 ft at 5:30PM May 25, 2017Observed: 5.12 ft at 5:45PM May 25, 2017Observed: 5.13 ft at 6:00PM May 25, 2017Observed: 5.13 ft at 6:15PM May 25, 2017Observed: 5.14 ft at 6:30PM May 25, 2017Observed: 5.14 ft at 6:45PM May 25, 2017Observed: 5.15 ft at 7:00PM May 25, 2017Observed: 5.16 ft at 7:15PM May 25, 2017Observed: 5.17 ft at 7:30PM May 25, 2017Observed: 5.18 ft at 7:45PM May 25, 2017Observed: 5.19 ft at 8:00PM May 25, 2017Observed: 5.2 ft at 8:15PM May 25, 2017Observed: 5.21 ft at 8:30PM May 25, 2017Observed: 5.22 ft at 8:45PM May 25, 2017Observed: 5.23 ft at 9:00PM May 25, 2017Observed: 5.25 ft at 9:15PM May 25, 2017Observed: 5.27 ft at 9:30PM May 25, 2017Observed: 5.29 ft at 9:45PM May 25, 2017Observed: 5.32 ft at 10:00PM May 25, 2017Observed: 5.34 ft at 10:15PM May 25, 2017Observed: 5.38 ft at 10:30PM May 25, 2017Observed: 5.42 ft at 10:45PM May 25, 2017Observed: 5.48 ft at 11:00PM May 25, 2017Observed: 5.53 ft at 11:15PM May 25, 2017Observed: 5.61 ft at 11:30PM May 25, 2017Observed: 5.69 ft at 11:45PM May 25, 2017Observed: 5.77 ft at 12:00AM May 26, 2017Observed: 5.87 ft at 12:15AM May 26, 2017Observed: 5.97 ft at 12:30AM May 26, 2017Observed: 6.08 ft at 12:45AM May 26, 2017Observed: 6.2 ft at 1:00AM May 26, 2017Observed: 6.33 ft at 1:15AM May 26, 2017Observed: 6.45 ft at 1:30AM May 26, 2017Observed: 6.57 ft at 1:45AM May 26, 2017Observed: 6.69 ft at 2:00AM May 26, 2017Observed: 6.79 ft at 2:15AM May 26, 2017Observed: 6.91 ft at 2:30AM May 26, 2017Observed: 7.02 ft at 2:45AM May 26, 2017Observed: 7.12 ft at 3:00AM May 26, 2017Observed: 7.2 ft at 3:15AM May 26, 2017Observed: 7.25 ft at 3:30AM May 26, 2017Observed: 7.29 ft at 3:45AM May 26, 2017Observed: 7.42 ft at 4:00AM May 26, 2017Observed: 7.51 ft at 4:15AM May 26, 2017Observed: 7.57 ft at 4:30AM May 26, 2017Observed: 7.63 ft at 4:45AM May 26, 2017Observed: 7.69 ft at 5:00AM May 26, 2017Observed: 7.74 ft at 5:15AM May 26, 2017Observed: 7.78 ft at 5:30AM May 26, 2017Observed: 7.82 ft at 5:45AM May 26, 2017Observed: 7.86 ft at 6:00AM May 26, 2017Observed: 7.89 ft at 6:15AM May 26, 2017Observed: 7.92 ft at 6:30AM May 26, 2017Observed: 7.94 ft at 6:45AM May 26, 2017Observed: 7.97 ft at 7:00AM May 26, 2017Observed: 7.99 ft at 7:15AM May 26, 2017Observed: 8.02 ft at 7:30AM May 26, 2017Observed: 8.08 ft at 7:45AM May 26, 2017Observed: 8.1 ft at 8:00AM May 26, 2017Observed: 8.12 ft at 8:15AM May 26, 2017Observed: 8.14 ft at 8:30AM May 26, 2017Observed: 8.16 ft at 8:45AM May 26, 2017Observed: 8.18 ft at 9:00AM May 26, 2017Observed: 8.2 ft at 9:15AM May 26, 2017Observed: 8.22 ft at 9:30AM May 26, 2017Observed: 8.24 ft at 9:45AM May 26, 2017Observed: 8.26 ft at 10:00AM May 26, 2017Observed: 8.28 ft at 10:15AM May 26, 2017Observed: 8.29 ft at 10:30AM May 26, 2017Observed: 8.31 ft at 10:45AM May 26, 2017Observed: 8.33 ft at 11:00AM May 26, 2017Observed: 8.34 ft at 11:15AM May 26, 2017Observed: 8.38 ft at 11:30AM May 26, 2017Observed: 8.39 ft at 11:45AM May 26, 2017Observed: 8.4 ft at 12:00PM May 26, 2017Observed: 8.43 ft at 12:15PM May 26, 2017Observed: 8.45 ft at 12:30PM May 26, 2017Observed: 8.48 ft at 12:45PM May 26, 2017Observed: 8.51 ft at 1:00PM May 26, 2017Observed: 8.53 ft at 1:15PM May 26, 2017Observed: 8.56 ft at 1:30PM May 26, 2017Observed: 8.6 ft at 1:45PM May 26, 2017Observed: 8.63 ft at 2:00PM May 26, 2017Observed: 8.66 ft at 2:15PM May 26, 2017Observed: 8.71 ft at 2:30PM May 26, 2017Observed: 8.77 ft at 2:45PM May 26, 2017Observed: 8.83 ft at 3:00PM May 26, 2017Observed: 8.89 ft at 3:15PM May 26, 2017Observed: 8.96 ft at 3:30PM May 26, 2017Observed: 9.03 ft at 3:45PM May 26, 2017Observed: 9.12 ft at 4:00PM May 26, 2017Observed: 9.2 ft at 4:15PM May 26, 2017Observed: 9.3 ft at 4:30PM May 26, 2017Observed: 9.39 ft at 4:45PM May 26, 2017Observed: 9.49 ft at 5:00PM May 26, 2017Observed: 9.58 ft at 5:15PM May 26, 2017Observed: 9.66 ft at 5:30PM May 26, 2017Observed: 9.74 ft at 5:45PM May 26, 2017Observed: 9.83 ft at 6:00PM May 26, 2017Observed: 9.9 ft at 6:15PM May 26, 2017Observed: 9.97 ft at 6:30PM May 26, 2017Observed: 10.03 ft at 6:45PM May 26, 2017Observed: 10.09 ft at 7:00PM May 26, 2017Observed: 10.14 ft at 7:15PM May 26, 2017Observed: 10.2 ft at 7:30PM May 26, 2017Observed: 10.24 ft at 7:45PM May 26, 2017Observed: 10.28 ft at 8:00PM May 26, 2017Observed: 10.31 ft at 8:15PM May 26, 2017Observed: 10.34 ft at 8:30PM May 26, 2017Observed: 10.37 ft at 8:45PM May 26, 2017Observed: 10.4 ft at 9:00PM May 26, 2017Observed: 10.42 ft at 9:15PM May 26, 2017Observed: 10.44 ft at 9:30PM May 26, 2017Observed: 10.45 ft at 9:45PM May 26, 2017Observed: 10.47 ft at 10:00PM May 26, 2017Observed: 10.49 ft at 10:15PM May 26, 2017Observed: 10.49 ft at 10:30PM May 26, 2017Observed: 10.5 ft at 10:45PM May 26, 2017Highest Observation: 10.51 ft at 11:00PM May 26, 2017Highest Observation: 10.51 ft at 11:15PM May 26, 2017Highest Observation: 10.51 ft at 11:30PM May 26, 2017Highest Observation: 10.51 ft at 11:45PM May 26, 2017Observed: 10.5 ft at 12:00AM May 27, 2017Observed: 10.5 ft at 12:15AM May 27, 2017Observed: 10.5 ft at 12:30AM May 27, 2017Observed: 10.49 ft at 12:45AM May 27, 2017Observed: 10.47 ft at 1:00AM May 27, 2017Observed: 10.46 ft at 1:15AM May 27, 2017Observed: 10.44 ft at 1:30AM May 27, 2017Observed: 10.43 ft at 1:45AM May 27, 2017Observed: 10.41 ft at 2:00AM May 27, 2017Observed: 10.39 ft at 2:15AM May 27, 2017Observed: 10.38 ft at 2:30AM May 27, 2017Observed: 10.36 ft at 2:45AM May 27, 2017Observed: 10.34 ft at 3:00AM May 27, 2017Observed: 10.32 ft at 3:15AM May 27, 2017Observed: 10.3 ft at 3:30AM May 27, 2017Observed: 10.28 ft at 3:45AM May 27, 2017Observed: 10.25 ft at 4:00AM May 27, 2017Observed: 10.23 ft at 4:15AM May 27, 2017Observed: 10.2 ft at 4:30AM May 27, 2017Observed: 10.18 ft at 4:45AM May 27, 2017Observed: 10.16 ft at 5:00AM May 27, 2017Observed: 10.13 ft at 5:15AM May 27, 2017Observed: 10.11 ft at 5:30AM May 27, 2017Observed: 10.09 ft at 5:45AM May 27, 2017Observed: 10.06 ft at 6:00AM May 27, 2017Observed: 10.03 ft at 6:15AM May 27, 2017Observed: 10.01 ft at 6:30AM May 27, 2017Observed: 9.99 ft at 6:45AM May 27, 2017Observed: 9.96 ft at 7:00AM May 27, 2017Observed: 9.94 ft at 7:15AM May 27, 2017Observed: 9.91 ft at 7:30AM May 27, 2017Observed: 9.89 ft at 7:45AM May 27, 2017Observed: 9.86 ft at 8:00AM May 27, 2017Observed: 9.83 ft at 8:15AM May 27, 2017Observed: 9.81 ft at 8:30AM May 27, 2017Observed: 9.79 ft at 8:45AM May 27, 2017Observed: 9.76 ft at 9:00AM May 27, 2017Observed: 9.74 ft at 9:15AM May 27, 2017Observed: 9.71 ft at 9:30AM May 27, 2017Observed: 9.68 ft at 9:45AM May 27, 2017Observed: 9.66 ft at 10:00AM May 27, 2017Observed: 9.63 ft at 10:15AM May 27, 2017Observed: 9.61 ft at 10:30AM May 27, 2017Observed: 9.58 ft at 10:45AM May 27, 2017Observed: 9.56 ft at 11:00AM May 27, 2017Observed: 9.52 ft at 11:15AM May 27, 2017Observed: 9.51 ft at 11:30AM May 27, 2017Observed: 9.49 ft at 11:45AM May 27, 2017Observed: 9.46 ft at 12:00PM May 27, 2017Observed: 9.43 ft at 12:15PM May 27, 2017Observed: 9.41 ft at 12:30PM May 27, 2017Observed: 9.39 ft at 12:45PM May 27, 2017Observed: 9.36 ft at 1:00PM May 27, 2017Observed: 9.34 ft at 1:15PM May 27, 2017Observed: 9.32 ft at 1:30PM May 27, 2017Observed: 9.3 ft at 1:45PM May 27, 2017Observed: 9.28 ft at 2:00PM May 27, 2017Observed: 9.26 ft at 2:15PM May 27, 2017Observed: 9.23 ft at 2:30PM May 27, 2017Observed: 9.21 ft at 2:45PM May 27, 2017Observed: 9.19 ft at 3:00PM May 27, 2017Observed: 9.17 ft at 3:15PM May 27, 2017Observed: 9.16 ft at 3:30PM May 27, 2017Observed: 9.14 ft at 3:45PM May 27, 2017Observed: 9.12 ft at 4:00PM May 27, 2017Observed: 9.1 ft at 4:15PM May 27, 2017Observed: 9.08 ft at 4:30PM May 27, 2017Observed: 9.07 ft at 4:45PM May 27, 2017Observed: 9.05 ft at 5:00PM May 27, 2017Observed: 9.04 ft at 5:15PM May 27, 2017Observed: 9.02 ft at 5:30PM May 27, 2017Observed: 9 ft at 5:45PM May 27, 2017Observed: 8.99 ft at 6:00PM May 27, 2017Observed: 8.98 ft at 6:15PM May 27, 2017Observed: 8.96 ft at 6:30PM May 27, 2017Observed: 8.95 ft at 6:45PM May 27, 2017Observed: 8.94 ft at 7:00PM May 27, 2017Observed: 8.92 ft at 7:15PM May 27, 2017Observed: 8.91 ft at 7:30PM May 27, 2017Observed: 8.9 ft at 7:45PM May 27, 2017Observed: 8.88 ft at 8:00PM May 27, 2017Observed: 8.87 ft at 8:15PM May 27, 2017Observed: 8.86 ft at 8:30PM May 27, 2017Observed: 8.84 ft at 8:45PM May 27, 2017Observed: 8.83 ft at 9:00PM May 27, 2017Observed: 8.81 ft at 9:15PM May 27, 2017Observed: 8.8 ft at 9:30PM May 27, 2017Observed: 8.78 ft at 9:45PM May 27, 2017Observed: 8.77 ft at 10:00PM May 27, 2017Observed: 8.76 ft at 10:15PM May 27, 2017Observed: 8.74 ft at 10:30PM May 27, 2017Observed: 8.73 ft at 10:45PM May 27, 2017Observed: 8.72 ft at 11:00PM May 27, 2017Observed: 8.71 ft at 11:15PM May 27, 2017Observed: 8.69 ft at 11:30PM May 27, 2017Observed: 8.68 ft at 11:45PM May 27, 2017Observed: 8.67 ft at 12:00AM May 28, 2017Observed: 8.65 ft at 12:15AM May 28, 2017Observed: 8.64 ft at 12:30AM May 28, 2017Observed: 8.63 ft at 12:45AM May 28, 2017Observed: 8.62 ft at 1:00AM May 28, 2017Observed: 8.61 ft at 1:15AM May 28, 2017Observed: 8.59 ft at 1:30AM May 28, 2017Observed: 8.58 ft at 1:45AM May 28, 2017Observed: 8.58 ft at 2:00AM May 28, 2017Observed: 8.56 ft at 2:15AM May 28, 2017Observed: 8.55 ft at 2:30AM May 28, 2017Observed: 8.53 ft at 2:45AM May 28, 2017Observed: 8.52 ft at 3:00AM May 28, 2017Observed: 8.51 ft at 3:15AM May 28, 2017Observed: 8.5 ft at 3:30AM May 28, 2017Observed: 8.49 ft at 3:45AM May 28, 2017Observed: 8.48 ft at 4:00AM May 28, 2017Observed: 8.47 ft at 4:15AM May 28, 2017Observed: 8.46 ft at 4:30AM May 28, 2017Observed: 8.45 ft at 4:45AM May 28, 2017Observed: 8.44 ft at 5:00AM May 28, 2017Observed: 8.43 ft at 5:15AM May 28, 2017Observed: 8.42 ft at 5:30AM May 28, 2017Observed: 8.41 ft at 5:45AM May 28, 2017Observed: 8.39 ft at 6:00AM May 28, 2017Observed: 8.38 ft at 6:15AM May 28, 2017Observed: 8.38 ft at 6:30AM May 28, 2017Observed: 8.37 ft at 6:45AM May 28, 2017Observed: 8.36 ft at 7:00AM May 28, 2017Observed: 8.35 ft at 7:15AM May 28, 2017Observed: 8.34 ft at 7:30AM May 28, 2017Observed: 8.33 ft at 7:45AM May 28, 2017Observed: 8.32 ft at 8:00AM May 28, 2017Observed: 8.31 ft at 8:15AM May 28, 2017Observed: 8.3 ft at 8:30AM May 28, 2017Observed: 8.3 ft at 8:45AM May 28, 2017Observed: 8.29 ft at 9:00AM May 28, 2017Observed: 8.28 ft at 9:15AM May 28, 2017Observed: 8.28 ft at 9:30AM May 28, 2017Observed: 8.27 ft at 9:45AM May 28, 2017Observed: 8.26 ft at 10:00AM May 28, 2017Observed: 8.26 ft at 10:15AM May 28, 2017Observed: 8.25 ft at 10:30AM May 28, 2017Observed: 8.24 ft at 10:45AM May 28, 2017Observed: 8.24 ft at 11:00AM May 28, 2017Observed: 8.23 ft at 11:15AM May 28, 2017Observed: 8.23 ft at 11:30AM May 28, 2017Observed: 8.22 ft at 11:45AM May 28, 2017Observed: 8.22 ft at 12:00PM May 28, 2017Observed: 8.21 ft at 12:15PM May 28, 2017Observed: 8.21 ft at 12:30PM May 28, 2017Observed: 8.2 ft at 12:45PM May 28, 2017Observed: 8.19 ft at 1:00PM May 28, 2017Observed: 8.19 ft at 1:15PM May 28, 2017Observed: 8.18 ft at 1:30PM May 28, 2017Observed: 8.18 ft at 1:45PM May 28, 2017Observed: 8.17 ft at 2:00PM May 28, 2017Observed: 8.17 ft at 2:15PM May 28, 2017Observed: 8.16 ft at 2:30PM May 28, 2017Observed: 8.16 ft at 2:45PM May 28, 2017Observed: 8.16 ft at 3:00PM May 28, 2017Observed: 8.15 ft at 3:15PM May 28, 2017Observed: 8.15 ft at 3:30PM May 28, 2017Observed: 8.14 ft at 3:45PM May 28, 2017Observed: 8.14 ft at 4:00PM May 28, 2017Observed: 8.13 ft at 4:15PM May 28, 2017Observed: 8.11 ft at 4:30PM May 28, 2017Observed: 8.11 ft at 4:45PM May 28, 2017Observed: 8.1 ft at 5:00PM May 28, 2017Observed: 8.09 ft at 5:15PM May 28, 2017Observed: 8.08 ft at 5:30PM May 28, 2017Observed: 8.08 ft at 5:45PM May 28, 2017Observed: 8.06 ft at 6:00PM May 28, 2017Observed: 8.06 ft at 6:15PM May 28, 2017Observed: 8.05 ft at 6:30PM May 28, 2017Observed: 8.04 ft at 6:45PM May 28, 2017Observed: 8.04 ft at 7:00PM May 28, 2017Observed: 8.04 ft at 7:15PM May 28, 2017Observed: 8.02 ft at 7:30PM May 28, 2017Observed: 8.01 ft at 7:45PM May 28, 2017Observed: 8.01 ft at 8:00PM May 28, 2017Observed: 8 ft at 8:15PM May 28, 2017Observed: 8.01 ft at 8:30PM May 28, 2017Observed: 8 ft at 8:45PM May 28, 2017Observed: 7.99 ft at 9:00PM May 28, 2017Observed: 7.98 ft at 9:15PM May 28, 2017Observed: 7.97 ft at 9:30PM May 28, 2017Observed: 7.97 ft at 9:45PM May 28, 2017Observed: 7.98 ft at 10:00PM May 28, 2017Observed: 7.97 ft at 10:15PM May 28, 2017Observed: 7.97 ft at 10:30PM May 28, 2017Observed: 7.96 ft at 10:45PM May 28, 2017Observed: 7.96 ft at 11:00PM May 28, 2017Observed: 7.96 ft at 11:15PM May 28, 2017Observed: 7.97 ft at 11:30PM May 28, 2017Observed: 7.98 ft at 11:45PM May 28, 2017Observed: 7.98 ft at 12:00AM May 29, 2017Observed: 7.99 ft at 12:15AM May 29, 2017Observed: 8 ft at 12:30AM May 29, 2017Observed: 8 ft at 12:45AM May 29, 2017Observed: 8.01 ft at 1:00AM May 29, 2017Observed: 8.01 ft at 1:15AM May 29, 2017Observed: 8.01 ft at 1:30AM May 29, 2017Observed: 8.01 ft at 1:45AM May 29, 2017Observed: 8.01 ft at 2:00AM May 29, 2017Observed: 8.01 ft at 2:15AM May 29, 2017Observed: 8 ft at 2:30AM May 29, 2017Observed: 8 ft at 2:45AM May 29, 2017Observed: 8 ft at 3:00AM May 29, 2017Observed: 7.99 ft at 3:15AM May 29, 2017Observed: 7.99 ft at 3:30AM May 29, 2017Observed: 7.98 ft at 3:45AM May 29, 2017Observed: 7.98 ft at 4:00AM May 29, 2017Observed: 7.98 ft at 4:15AM May 29, 2017Observed: 7.97 ft at 4:30AM May 29, 2017Observed: 7.97 ft at 4:45AM May 29, 2017Observed: 7.97 ft at 5:00AM May 29, 2017Observed: 7.97 ft at 5:15AM May 29, 2017Observed: 7.96 ft at 5:30AM May 29, 2017Observed: 7.96 ft at 5:45AM May 29, 2017Observed: 7.96 ft at 6:00AM May 29, 2017Observed: 7.95 ft at 6:15AM May 29, 2017Observed: 7.95 ft at 6:30AM May 29, 2017Observed: 7.95 ft at 6:45AM May 29, 2017Observed: 7.95 ft at 7:00AM May 29, 2017Observed: 7.94 ft at 7:15AM May 29, 2017Observed: 7.94 ft at 7:30AM May 29, 2017Observed: 7.94 ft at 7:45AM May 29, 2017Observed: 7.93 ft at 8:00AM May 29, 2017Observed: 7.93 ft at 8:15AM May 29, 2017Observed: 7.93 ft at 8:30AM May 29, 2017Observed: 7.93 ft at 8:45AM May 29, 2017Observed: 7.93 ft at 9:00AM May 29, 2017Observed: 7.94 ft at 9:15AM May 29, 2017Observed: 7.95 ft at 9:30AM May 29, 2017Observed: 7.96 ft at 9:45AM May 29, 2017Observed: 7.98 ft at 10:00AM May 29, 2017Observed: 7.99 ft at 10:15AM May 29, 2017Observed: 8.01 ft at 10:30AM May 29, 2017Observed: 8.02 ft at 10:45AM May 29, 2017Observed: 8.03 ft at 11:00AM May 29, 2017Observed: 8.04 ft at 11:15AM May 29, 2017Observed: 8.05 ft at 11:30AM May 29, 2017Observed: 8.06 ft at 11:45AM May 29, 2017Observed: 8.06 ft at 12:00PM May 29, 2017Observed: 8.07 ft at 12:15PM May 29, 2017Observed: 8.07 ft at 12:30PM May 29, 2017Observed: 8.06 ft at 12:45PM May 29, 2017Observed: 8.06 ft at 1:00PM May 29, 2017Observed: 8.06 ft at 1:15PM May 29, 2017Observed: 8.06 ft at 1:30PM May 29, 2017Observed: 8.06 ft at 1:45PM May 29, 2017Observed: 8.05 ft at 2:00PM May 29, 2017Observed: 8.05 ft at 2:15PM May 29, 2017Observed: 8.05 ft at 2:30PM May 29, 2017Observed: 8.05 ft at 2:45PM May 29, 2017Observed: 8.05 ft at 3:00PM May 29, 2017Observed: 8.05 ft at 3:15PM May 29, 2017Observed: 8.05 ft at 3:30PM May 29, 2017Observed: 8.07 ft at 3:45PM May 29, 2017Observed: 8.08 ft at 4:00PM May 29, 2017Observed: 8.08 ft at 4:15PM May 29, 2017Observed: 8.1 ft at 4:30PM May 29, 2017Observed: 8.11 ft at 4:45PM May 29, 2017Observed: 8.13 ft at 5:00PM May 29, 2017Observed: 8.15 ft at 5:15PM May 29, 2017Observed: 8.18 ft at 5:30PM May 29, 2017Observed: 8.21 ft at 5:45PM May 29, 2017Observed: 8.24 ft at 6:00PM May 29, 2017Observed: 8.26 ft at 6:15PM May 29, 2017Observed: 8.3 ft at 6:30PM May 29, 2017Observed: 8.33 ft at 6:45PM May 29, 2017Observed: 8.36 ft at 7:00PM May 29, 2017Observed: 8.39 ft at 7:15PM May 29, 2017Observed: 8.42 ft at 7:30PM May 29, 2017Observed: 8.46 ft at 7:45PM May 29, 2017Observed: 8.49 ft at 8:00PM May 29, 2017Observed: 8.52 ft at 8:15PM May 29, 2017Observed: 8.55 ft at 8:30PM May 29, 2017Observed: 8.57 ft at 8:45PM May 29, 2017Observed: 8.6 ft at 9:00PM May 29, 2017Observed: 8.62 ft at 9:15PM May 29, 2017Observed: 8.64 ft at 9:30PM May 29, 2017Observed: 8.66 ft at 9:45PM May 29, 2017Observed: 8.68 ft at 10:00PM May 29, 2017Observed: 8.69 ft at 10:15PM May 29, 2017Observed: 8.71 ft at 10:30PM May 29, 2017Observed: 8.72 ft at 10:45PM May 29, 2017Observed: 8.74 ft at 11:00PM May 29, 2017Observed: 8.75 ft at 11:15PM May 29, 2017Observed: 8.75 ft at 11:30PM May 29, 2017Observed: 8.77 ft at 11:45PM May 29, 2017Observed: 8.78 ft at 12:00AM May 30, 2017Observed: 8.78 ft at 12:15AM May 30, 2017Observed: 8.8 ft at 12:30AM May 30, 2017Observed: 8.81 ft at 12:45AM May 30, 2017Observed: 8.82 ft at 1:00AM May 30, 2017Observed: 8.84 ft at 1:15AM May 30, 2017Observed: 8.85 ft at 1:30AM May 30, 2017Observed: 8.86 ft at 1:45AM May 30, 2017Observed: 8.88 ft at 2:00AM May 30, 2017Observed: 8.9 ft at 2:15AM May 30, 2017Highest Forecast: 8.9 ft 8:00AM May 30, 2017Highest Forecast: 8.9 ft 2:00PM May 30, 2017Forecast: 8.5 ft 8:00PM May 30, 2017Forecast: 8 ft 2:00AM May 31, 2017Forecast: 7.8 ft 8:00AM May 31, 2017Forecast: 7.7 ft 2:00PM May 31, 2017Forecast: 7.6 ft 8:00PM May 31, 2017Forecast: 7.3 ft 2:00AM Jun 01, 2017Forecast: 7.1 ft 8:00AM Jun 01, 2017USGS--Water Resources of the United StatesHNKM2(plotting HGIRG) Graph Created (2:53AM May 30, 2017)ObservedForecast (issued 10:14AM May 29)Latest observed value: 8.9 ft at 2:15 AM EDT 30-May-2017. Flood Stage is 30 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 Hancock are issued routinely year-round.
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Upstream Gauge - at Paw Paw Upstream Gauge Downstream Gauge Downstream Gauge - at Williamsport
Flood Categories (in feet)
Major Flood Stage: 35
Moderate Flood Stage: 33
Flood Stage: 30
Action Stage: 24
Low Stage (in feet): 0

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) 25.41 ft on 05/19/2011
(2) 35.81 ft on 09/08/1996
(3) 36.26 ft on 01/20/1996
(4) 41.20 ft on 11/06/1985
(5) 30.79 ft on 06/23/1972
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
KML Image
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
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.
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 30 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
3 Day (SREF) 7 Day (NAEFS) 7 Day (GEFS)
SREF Ensemble NAEFS Ensemble  GEFS Ensemble 

Note: Use the official hydrograph at the top of this web page for river levels within the next 48 hours.

See the Product Description Document link for more details on the interpretation of the 3,7 day graphics. 

Click individual graphics to enlarge.

Resources Collapse
Hydrologic Resources Additional Resources
Collaborative Agencies Collapse
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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Page last modified: 21-Dec-2016 10:38 PM
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