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  NOTICE:There is a service interruption for a number of stream gauges nationwide due to the Global Positioning System (GPS) Rollover that occurred on April 6 at 23:59 GMT. The National Weather Service is working with federal, state, and local partners to ensure those affected gauges obtain the necessary updates to resume data transmission. We apologize for the service interruption and hope to have the data restored as soon as possible.

Hydrograph River at a Glance Download
Potomac River at Hancock Stage (ft)Flow (kcfs)Observed: 6.94 ft at 2:00PM Apr 18, 2019Observed: 6.93 ft at 2:15PM Apr 18, 2019Observed: 6.92 ft at 2:30PM Apr 18, 2019Observed: 6.92 ft at 2:45PM Apr 18, 2019Observed: 6.92 ft at 3:00PM Apr 18, 2019Observed: 6.92 ft at 3:15PM Apr 18, 2019Observed: 6.91 ft at 3:30PM Apr 18, 2019Observed: 6.91 ft at 3:45PM Apr 18, 2019Observed: 6.9 ft at 4:00PM Apr 18, 2019Observed: 6.9 ft at 4:15PM Apr 18, 2019Observed: 6.89 ft at 4:30PM Apr 18, 2019Observed: 6.89 ft at 4:45PM Apr 18, 2019Observed: 6.88 ft at 5:00PM Apr 18, 2019Observed: 6.88 ft at 5:15PM Apr 18, 2019Observed: 6.87 ft at 5:30PM Apr 18, 2019Observed: 6.86 ft at 5:45PM Apr 18, 2019Observed: 6.86 ft at 6:00PM Apr 18, 2019Observed: 6.85 ft at 6:15PM Apr 18, 2019Observed: 6.85 ft at 6:30PM Apr 18, 2019Observed: 6.84 ft at 6:45PM Apr 18, 2019Observed: 6.83 ft at 7:00PM Apr 18, 2019Observed: 6.83 ft at 7:15PM Apr 18, 2019Observed: 6.82 ft at 7:30PM Apr 18, 2019Observed: 6.82 ft at 7:45PM Apr 18, 2019Observed: 6.82 ft at 8:00PM Apr 18, 2019Observed: 6.81 ft at 8:15PM Apr 18, 2019Observed: 6.81 ft at 8:30PM Apr 18, 2019Observed: 6.8 ft at 8:45PM Apr 18, 2019Observed: 6.8 ft at 9:00PM Apr 18, 2019Observed: 6.79 ft at 9:15PM Apr 18, 2019Observed: 6.79 ft at 9:30PM Apr 18, 2019Observed: 6.78 ft at 9:45PM Apr 18, 2019Observed: 6.78 ft at 10:00PM Apr 18, 2019Observed: 6.77 ft at 10:15PM Apr 18, 2019Observed: 6.77 ft at 10:30PM Apr 18, 2019Observed: 6.76 ft at 10:45PM Apr 18, 2019Observed: 6.76 ft at 11:00PM Apr 18, 2019Observed: 6.75 ft at 11:15PM Apr 18, 2019Observed: 6.74 ft at 11:30PM Apr 18, 2019Observed: 6.74 ft at 11:45PM Apr 18, 2019Observed: 6.74 ft at 12:00AM Apr 19, 2019Observed: 6.73 ft at 12:15AM Apr 19, 2019Observed: 6.73 ft at 12:30AM Apr 19, 2019Observed: 6.72 ft at 12:45AM Apr 19, 2019Observed: 6.72 ft at 1:00AM Apr 19, 2019Observed: 6.71 ft at 1:15AM Apr 19, 2019Observed: 6.71 ft at 1:30AM Apr 19, 2019Observed: 6.7 ft at 1:45AM Apr 19, 2019Observed: 6.7 ft at 2:00AM Apr 19, 2019Observed: 6.7 ft at 2:15AM Apr 19, 2019Observed: 6.69 ft at 2:30AM Apr 19, 2019Observed: 6.69 ft at 2:45AM Apr 19, 2019Observed: 6.69 ft at 3:00AM Apr 19, 2019Observed: 6.68 ft at 3:15AM Apr 19, 2019Observed: 6.68 ft at 3:30AM Apr 19, 2019Observed: 6.68 ft at 3:45AM Apr 19, 2019Observed: 6.67 ft at 4:00AM Apr 19, 2019Observed: 6.67 ft at 4:15AM Apr 19, 2019Observed: 6.67 ft at 4:30AM Apr 19, 2019Observed: 6.66 ft at 4:45AM Apr 19, 2019Observed: 6.66 ft at 5:00AM Apr 19, 2019Observed: 6.66 ft at 5:15AM Apr 19, 2019Observed: 6.65 ft at 5:30AM Apr 19, 2019Observed: 6.65 ft at 5:45AM Apr 19, 2019Observed: 6.65 ft at 6:00AM Apr 19, 2019Observed: 6.64 ft at 6:15AM Apr 19, 2019Observed: 6.64 ft at 6:30AM Apr 19, 2019Observed: 6.64 ft at 6:45AM Apr 19, 2019Observed: 6.63 ft at 7:00AM Apr 19, 2019Observed: 6.63 ft at 7:15AM Apr 19, 2019Observed: 6.63 ft at 7:30AM Apr 19, 2019Observed: 6.63 ft at 7:45AM Apr 19, 2019Observed: 6.63 ft at 8:00AM Apr 19, 2019Observed: 6.61 ft at 8:15AM Apr 19, 2019Observed: 6.6 ft at 8:30AM Apr 19, 2019Observed: 6.6 ft at 8:45AM Apr 19, 2019Observed: 6.6 ft at 9:00AM Apr 19, 2019Observed: 6.59 ft at 9:15AM Apr 19, 2019Observed: 6.59 ft at 9:30AM Apr 19, 2019Observed: 6.58 ft at 9:45AM Apr 19, 2019Observed: 6.58 ft at 10:00AM Apr 19, 2019Observed: 6.58 ft at 10:15AM Apr 19, 2019Observed: 6.57 ft at 10:30AM Apr 19, 2019Observed: 6.57 ft at 10:45AM Apr 19, 2019Observed: 6.56 ft at 11:00AM Apr 19, 2019Observed: 6.56 ft at 11:15AM Apr 19, 2019Observed: 6.55 ft at 11:30AM Apr 19, 2019Observed: 6.55 ft at 11:45AM Apr 19, 2019Observed: 6.54 ft at 12:00PM Apr 19, 2019Observed: 6.54 ft at 12:15PM Apr 19, 2019Observed: 6.54 ft at 12:30PM Apr 19, 2019Observed: 6.54 ft at 12:45PM Apr 19, 2019Observed: 6.53 ft at 1:00PM Apr 19, 2019Observed: 6.53 ft at 1:15PM Apr 19, 2019Observed: 6.53 ft at 1:30PM Apr 19, 2019Observed: 6.53 ft at 1:45PM Apr 19, 2019Observed: 6.53 ft at 2:00PM Apr 19, 2019Observed: 6.51 ft at 2:15PM Apr 19, 2019Observed: 6.51 ft at 2:30PM Apr 19, 2019Observed: 6.52 ft at 2:45PM Apr 19, 2019Observed: 6.52 ft at 3:00PM Apr 19, 2019Observed: 6.52 ft at 3:15PM Apr 19, 2019Observed: 6.52 ft at 3:30PM Apr 19, 2019Observed: 6.52 ft at 3:45PM Apr 19, 2019Observed: 6.52 ft at 4:00PM Apr 19, 2019Observed: 6.52 ft at 4:15PM Apr 19, 2019Observed: 6.51 ft at 4:30PM Apr 19, 2019Observed: 6.5 ft at 4:45PM Apr 19, 2019Observed: 6.5 ft at 5:00PM Apr 19, 2019Observed: 6.5 ft at 5:15PM Apr 19, 2019Observed: 6.49 ft at 5:30PM Apr 19, 2019Observed: 6.49 ft at 5:45PM Apr 19, 2019Observed: 6.49 ft at 6:00PM Apr 19, 2019Observed: 6.48 ft at 6:15PM Apr 19, 2019Observed: 6.48 ft at 6:30PM Apr 19, 2019Observed: 6.5 ft at 6:45PM Apr 19, 2019Observed: 6.5 ft at 7:00PM Apr 19, 2019Observed: 6.51 ft at 7:15PM Apr 19, 2019Observed: 6.51 ft at 7:30PM Apr 19, 2019Observed: 6.51 ft at 7:45PM Apr 19, 2019Observed: 6.51 ft at 8:00PM Apr 19, 2019Observed: 6.51 ft at 8:15PM Apr 19, 2019Observed: 6.51 ft at 8:30PM Apr 19, 2019Observed: 6.52 ft at 8:45PM Apr 19, 2019Observed: 6.52 ft at 9:00PM Apr 19, 2019Observed: 6.53 ft at 9:15PM Apr 19, 2019Observed: 6.54 ft at 9:30PM Apr 19, 2019Observed: 6.55 ft at 9:45PM Apr 19, 2019Observed: 6.56 ft at 10:00PM Apr 19, 2019Observed: 6.57 ft at 10:15PM Apr 19, 2019Observed: 6.58 ft at 10:30PM Apr 19, 2019Observed: 6.59 ft at 10:45PM Apr 19, 2019Observed: 6.6 ft at 11:00PM Apr 19, 2019Observed: 6.61 ft at 11:15PM Apr 19, 2019Observed: 6.62 ft at 11:30PM Apr 19, 2019Observed: 6.64 ft at 11:45PM Apr 19, 2019Observed: 6.65 ft at 12:00AM Apr 20, 2019Observed: 6.66 ft at 12:15AM Apr 20, 2019Observed: 6.67 ft at 12:30AM Apr 20, 2019Observed: 6.67 ft at 12:45AM Apr 20, 2019Observed: 6.68 ft at 1:00AM Apr 20, 2019Observed: 6.69 ft at 1:15AM Apr 20, 2019Observed: 6.7 ft at 1:30AM Apr 20, 2019Observed: 6.71 ft at 1:45AM Apr 20, 2019Observed: 6.72 ft at 2:00AM Apr 20, 2019Observed: 6.73 ft at 2:15AM Apr 20, 2019Observed: 6.75 ft at 2:30AM Apr 20, 2019Observed: 6.76 ft at 2:45AM Apr 20, 2019Observed: 6.78 ft at 3:00AM Apr 20, 2019Observed: 6.8 ft at 3:15AM Apr 20, 2019Observed: 6.82 ft at 3:30AM Apr 20, 2019Observed: 6.84 ft at 3:45AM Apr 20, 2019Observed: 6.86 ft at 4:00AM Apr 20, 2019Observed: 6.88 ft at 4:15AM Apr 20, 2019Observed: 6.89 ft at 4:30AM Apr 20, 2019Observed: 6.9 ft at 4:45AM Apr 20, 2019Observed: 6.92 ft at 5:00AM Apr 20, 2019Observed: 6.97 ft at 5:15AM Apr 20, 2019Observed: 7.01 ft at 5:30AM Apr 20, 2019Observed: 7.04 ft at 5:45AM Apr 20, 2019Observed: 7.14 ft at 6:00AM Apr 20, 2019Observed: 7.24 ft at 6:15AM Apr 20, 2019Observed: 7.27 ft at 6:30AM Apr 20, 2019Observed: 7.32 ft at 6:45AM Apr 20, 2019Observed: 7.36 ft at 7:00AM Apr 20, 2019Observed: 7.41 ft at 7:15AM Apr 20, 2019Observed: 7.46 ft at 7:30AM Apr 20, 2019Observed: 7.51 ft at 7:45AM Apr 20, 2019Observed: 7.56 ft at 8:00AM Apr 20, 2019Observed: 7.61 ft at 8:15AM Apr 20, 2019Observed: 7.65 ft at 8:30AM Apr 20, 2019Observed: 7.69 ft at 8:45AM Apr 20, 2019Observed: 7.72 ft at 9:00AM Apr 20, 2019Observed: 7.74 ft at 9:15AM Apr 20, 2019Observed: 7.77 ft at 9:30AM Apr 20, 2019Observed: 7.92 ft at 9:45AM Apr 20, 2019Observed: 8.27 ft at 10:00AM Apr 20, 2019Observed: 8.4 ft at 10:15AM Apr 20, 2019Observed: 8.52 ft at 10:30AM Apr 20, 2019Observed: 8.62 ft at 10:45AM Apr 20, 2019Observed: 8.73 ft at 11:00AM Apr 20, 2019Observed: 8.84 ft at 11:15AM Apr 20, 2019Observed: 8.94 ft at 11:30AM Apr 20, 2019Observed: 9.05 ft at 11:45AM Apr 20, 2019Observed: 9.16 ft at 12:00PM Apr 20, 2019Observed: 9.26 ft at 12:15PM Apr 20, 2019Observed: 9.35 ft at 12:30PM Apr 20, 2019Observed: 9.46 ft at 12:45PM Apr 20, 2019Observed: 9.55 ft at 1:00PM Apr 20, 2019Observed: 9.64 ft at 1:15PM Apr 20, 2019Observed: 9.73 ft at 1:30PM Apr 20, 2019Observed: 9.82 ft at 1:45PM Apr 20, 2019Observed: 9.9 ft at 2:00PM Apr 20, 2019Observed: 9.98 ft at 2:15PM Apr 20, 2019Observed: 10.07 ft at 2:30PM Apr 20, 2019Observed: 10.15 ft at 2:45PM Apr 20, 2019Observed: 10.23 ft at 3:00PM Apr 20, 2019Observed: 10.31 ft at 3:15PM Apr 20, 2019Observed: 10.39 ft at 3:30PM Apr 20, 2019Observed: 10.46 ft at 3:45PM Apr 20, 2019Observed: 10.54 ft at 4:00PM Apr 20, 2019Observed: 10.61 ft at 4:15PM Apr 20, 2019Observed: 10.68 ft at 4:30PM Apr 20, 2019Observed: 10.75 ft at 4:45PM Apr 20, 2019Observed: 10.82 ft at 5:00PM Apr 20, 2019Observed: 10.89 ft at 5:15PM Apr 20, 2019Observed: 10.95 ft at 5:30PM Apr 20, 2019Observed: 11 ft at 5:45PM Apr 20, 2019Observed: 11.06 ft at 6:00PM Apr 20, 2019Observed: 11.11 ft at 6:15PM Apr 20, 2019Observed: 11.16 ft at 6:30PM Apr 20, 2019Observed: 11.21 ft at 6:45PM Apr 20, 2019Observed: 11.26 ft at 7:00PM Apr 20, 2019Observed: 11.29 ft at 7:15PM Apr 20, 2019Observed: 11.33 ft at 7:30PM Apr 20, 2019Observed: 11.36 ft at 7:45PM Apr 20, 2019Observed: 11.39 ft at 8:00PM Apr 20, 2019Observed: 11.42 ft at 8:15PM Apr 20, 2019Observed: 11.44 ft at 8:30PM Apr 20, 2019Observed: 11.47 ft at 8:45PM Apr 20, 2019Observed: 11.48 ft at 9:00PM Apr 20, 2019Observed: 11.5 ft at 9:15PM Apr 20, 2019Observed: 11.51 ft at 9:30PM Apr 20, 2019Observed: 11.52 ft at 9:45PM Apr 20, 2019Observed: 11.53 ft at 10:00PM Apr 20, 2019Observed: 11.54 ft at 10:15PM Apr 20, 2019Observed: 11.54 ft at 10:30PM Apr 20, 2019Observed: 11.55 ft at 10:45PM Apr 20, 2019Observed: 11.55 ft at 11:00PM Apr 20, 2019Observed: 11.56 ft at 11:15PM Apr 20, 2019Observed: 11.57 ft at 11:30PM Apr 20, 2019Observed: 11.58 ft at 11:45PM Apr 20, 2019Observed: 11.59 ft at 12:00AM Apr 21, 2019Observed: 11.6 ft at 12:15AM Apr 21, 2019Observed: 11.61 ft at 12:30AM Apr 21, 2019Observed: 11.62 ft at 12:45AM Apr 21, 2019Observed: 11.64 ft at 1:00AM Apr 21, 2019Observed: 11.66 ft at 1:15AM Apr 21, 2019Observed: 11.68 ft at 1:30AM Apr 21, 2019Observed: 11.7 ft at 1:45AM Apr 21, 2019Observed: 11.72 ft at 2:00AM Apr 21, 2019Observed: 11.74 ft at 2:15AM Apr 21, 2019Observed: 11.76 ft at 2:30AM Apr 21, 2019Observed: 11.79 ft at 2:45AM Apr 21, 2019Observed: 11.81 ft at 3:00AM Apr 21, 2019Observed: 11.83 ft at 3:15AM Apr 21, 2019Observed: 11.85 ft at 3:30AM Apr 21, 2019Observed: 11.88 ft at 3:45AM Apr 21, 2019Observed: 11.89 ft at 4:00AM Apr 21, 2019Observed: 11.91 ft at 4:15AM Apr 21, 2019Observed: 11.93 ft at 4:30AM Apr 21, 2019Observed: 11.94 ft at 4:45AM Apr 21, 2019Observed: 11.96 ft at 5:00AM Apr 21, 2019Observed: 11.97 ft at 5:15AM Apr 21, 2019Observed: 11.98 ft at 5:30AM Apr 21, 2019Observed: 11.99 ft at 5:45AM Apr 21, 2019Observed: 12 ft at 6:00AM Apr 21, 2019Observed: 12.01 ft at 6:15AM Apr 21, 2019Observed: 12.01 ft at 6:30AM Apr 21, 2019Observed: 12.01 ft at 6:45AM Apr 21, 2019Highest Observation: 12.02 ft at 7:00AM Apr 21, 2019Observed: 12.01 ft at 7:15AM Apr 21, 2019Observed: 12.01 ft at 7:30AM Apr 21, 2019Observed: 12.01 ft at 7:45AM Apr 21, 2019Observed: 12 ft at 8:00AM Apr 21, 2019Observed: 12 ft at 8:15AM Apr 21, 2019Observed: 11.98 ft at 8:30AM Apr 21, 2019Observed: 11.97 ft at 8:45AM Apr 21, 2019Observed: 11.96 ft at 9:00AM Apr 21, 2019Observed: 11.95 ft at 9:15AM Apr 21, 2019Observed: 11.93 ft at 9:30AM Apr 21, 2019Observed: 11.91 ft at 9:45AM Apr 21, 2019Observed: 11.9 ft at 10:00AM Apr 21, 2019Observed: 11.88 ft at 10:15AM Apr 21, 2019Observed: 11.86 ft at 10:30AM Apr 21, 2019Observed: 11.84 ft at 10:45AM Apr 21, 2019Observed: 11.82 ft at 11:00AM Apr 21, 2019Observed: 11.8 ft at 11:15AM Apr 21, 2019Observed: 11.77 ft at 11:30AM Apr 21, 2019Observed: 11.75 ft at 11:45AM Apr 21, 2019Observed: 11.72 ft at 12:00PM Apr 21, 2019Observed: 11.7 ft at 12:15PM Apr 21, 2019Observed: 11.67 ft at 12:30PM Apr 21, 2019Observed: 11.65 ft at 12:45PM Apr 21, 2019Observed: 11.62 ft at 1:00PM Apr 21, 2019Observed: 11.59 ft at 1:15PM Apr 21, 2019Observed: 11.56 ft at 1:30PM Apr 21, 2019Observed: 11.54 ft at 1:45PM Apr 21, 2019Observed: 11.5 ft at 2:00PM Apr 21, 2019Observed: 11.48 ft at 2:15PM Apr 21, 2019Observed: 11.45 ft at 2:30PM Apr 21, 2019Observed: 11.43 ft at 2:45PM Apr 21, 2019Observed: 11.39 ft at 3:00PM Apr 21, 2019Observed: 11.37 ft at 3:15PM Apr 21, 2019Observed: 11.34 ft at 3:30PM Apr 21, 2019Observed: 11.33 ft at 3:45PM Apr 21, 2019Observed: 11.28 ft at 4:00PM Apr 21, 2019Observed: 11.26 ft at 4:15PM Apr 21, 2019Observed: 11.23 ft at 4:30PM Apr 21, 2019Observed: 11.2 ft at 4:45PM Apr 21, 2019Observed: 11.17 ft at 5:00PM Apr 21, 2019Observed: 11.15 ft at 5:15PM Apr 21, 2019Observed: 11.12 ft at 5:30PM Apr 21, 2019Observed: 11.09 ft at 5:45PM Apr 21, 2019Observed: 11.07 ft at 6:00PM Apr 21, 2019Observed: 11.04 ft at 6:15PM Apr 21, 2019Observed: 11.01 ft at 6:30PM Apr 21, 2019Observed: 10.99 ft at 6:45PM Apr 21, 2019Observed: 10.96 ft at 7:00PM Apr 21, 2019Observed: 10.93 ft at 7:15PM Apr 21, 2019Observed: 10.91 ft at 7:30PM Apr 21, 2019Observed: 10.88 ft at 7:45PM Apr 21, 2019Observed: 10.86 ft at 8:00PM Apr 21, 2019Observed: 10.83 ft at 8:15PM Apr 21, 2019Observed: 10.8 ft at 8:30PM Apr 21, 2019Observed: 10.78 ft at 8:45PM Apr 21, 2019Observed: 10.76 ft at 9:00PM Apr 21, 2019Observed: 10.73 ft at 9:15PM Apr 21, 2019Observed: 10.7 ft at 9:30PM Apr 21, 2019Observed: 10.68 ft at 9:45PM Apr 21, 2019Observed: 10.66 ft at 10:00PM Apr 21, 2019Observed: 10.64 ft at 10:15PM Apr 21, 2019Observed: 10.61 ft at 10:30PM Apr 21, 2019Observed: 10.58 ft at 10:45PM Apr 21, 2019Observed: 10.56 ft at 11:00PM Apr 21, 2019Observed: 10.53 ft at 11:15PM Apr 21, 2019Observed: 10.51 ft at 11:30PM Apr 21, 2019Observed: 10.49 ft at 11:45PM Apr 21, 2019Observed: 10.47 ft at 12:00AM Apr 22, 2019Observed: 10.44 ft at 12:15AM Apr 22, 2019Observed: 10.42 ft at 12:30AM Apr 22, 2019Observed: 10.4 ft at 12:45AM Apr 22, 2019Observed: 10.37 ft at 1:00AM Apr 22, 2019Observed: 10.35 ft at 1:15AM Apr 22, 2019Observed: 10.33 ft at 1:30AM Apr 22, 2019Observed: 10.31 ft at 1:45AM Apr 22, 2019Observed: 10.29 ft at 2:00AM Apr 22, 2019Observed: 10.27 ft at 2:15AM Apr 22, 2019Observed: 10.24 ft at 2:30AM Apr 22, 2019Observed: 10.22 ft at 2:45AM Apr 22, 2019Observed: 10.2 ft at 3:00AM Apr 22, 2019Observed: 10.18 ft at 3:15AM Apr 22, 2019Observed: 10.16 ft at 3:30AM Apr 22, 2019Observed: 10.14 ft at 3:45AM Apr 22, 2019Observed: 10.12 ft at 4:00AM Apr 22, 2019Observed: 10.1 ft at 4:15AM Apr 22, 2019Observed: 10.08 ft at 4:30AM Apr 22, 2019Observed: 10.06 ft at 4:45AM Apr 22, 2019Observed: 10.04 ft at 5:00AM Apr 22, 2019Observed: 10.03 ft at 5:15AM Apr 22, 2019Observed: 10.01 ft at 5:30AM Apr 22, 2019Observed: 10 ft at 5:45AM Apr 22, 2019Observed: 9.98 ft at 6:00AM Apr 22, 2019Observed: 9.97 ft at 6:15AM Apr 22, 2019Observed: 9.95 ft at 6:30AM Apr 22, 2019Observed: 9.93 ft at 6:45AM Apr 22, 2019Observed: 9.91 ft at 7:00AM Apr 22, 2019Observed: 9.9 ft at 7:15AM Apr 22, 2019Observed: 9.88 ft at 7:30AM Apr 22, 2019Observed: 9.82 ft at 7:45AM Apr 22, 2019Observed: 9.8 ft at 8:00AM Apr 22, 2019Observed: 9.78 ft at 8:15AM Apr 22, 2019Observed: 9.76 ft at 8:30AM Apr 22, 2019Observed: 9.75 ft at 8:45AM Apr 22, 2019Observed: 9.73 ft at 9:00AM Apr 22, 2019Observed: 9.71 ft at 9:15AM Apr 22, 2019Observed: 9.7 ft at 9:30AM Apr 22, 2019Observed: 9.69 ft at 9:45AM Apr 22, 2019Observed: 9.65 ft at 10:00AM Apr 22, 2019Observed: 9.63 ft at 10:15AM Apr 22, 2019Observed: 9.62 ft at 10:30AM Apr 22, 2019Observed: 9.6 ft at 10:45AM Apr 22, 2019Observed: 9.59 ft at 11:00AM Apr 22, 2019Observed: 9.56 ft at 11:15AM Apr 22, 2019Observed: 9.55 ft at 11:30AM Apr 22, 2019Observed: 9.53 ft at 11:45AM Apr 22, 2019Observed: 9.51 ft at 12:00PM Apr 22, 2019Observed: 9.5 ft at 12:15PM Apr 22, 2019Observed: 9.48 ft at 12:30PM Apr 22, 2019Observed: 9.46 ft at 12:45PM Apr 22, 2019Observed: 9.45 ft at 1:00PM Apr 22, 2019Observed: 9.43 ft at 1:15PM Apr 22, 2019Observed: 9.41 ft at 1:30PM Apr 22, 2019Observed: 9.4 ft at 1:45PM Apr 22, 2019Observed: 9.38 ft at 2:00PM Apr 22, 2019Observed: 9.37 ft at 2:15PM Apr 22, 2019Observed: 9.35 ft at 2:30PM Apr 22, 2019Observed: 9.33 ft at 2:45PM Apr 22, 2019Observed: 9.32 ft at 3:00PM Apr 22, 2019Observed: 9.3 ft at 3:15PM Apr 22, 2019Observed: 9.28 ft at 3:30PM Apr 22, 2019Observed: 9.27 ft at 3:45PM Apr 22, 2019Observed: 9.26 ft at 4:00PM Apr 22, 2019Observed: 9.24 ft at 4:15PM Apr 22, 2019Observed: 9.22 ft at 4:30PM Apr 22, 2019Observed: 9.21 ft at 4:45PM Apr 22, 2019Observed: 9.19 ft at 5:00PM Apr 22, 2019Observed: 9.18 ft at 5:15PM Apr 22, 2019Observed: 9.16 ft at 5:30PM Apr 22, 2019Observed: 9.15 ft at 5:45PM Apr 22, 2019Observed: 9.13 ft at 6:00PM Apr 22, 2019Observed: 9.11 ft at 6:15PM Apr 22, 2019Observed: 9.1 ft at 6:30PM Apr 22, 2019Observed: 9.09 ft at 6:45PM Apr 22, 2019Observed: 9.07 ft at 7:00PM Apr 22, 2019Observed: 9.06 ft at 7:15PM Apr 22, 2019Observed: 9.04 ft at 7:30PM Apr 22, 2019Observed: 9.03 ft at 7:45PM Apr 22, 2019Observed: 9.02 ft at 8:00PM Apr 22, 2019Observed: 9 ft at 8:15PM Apr 22, 2019Observed: 8.99 ft at 8:30PM Apr 22, 2019Observed: 8.97 ft at 8:45PM Apr 22, 2019Observed: 8.96 ft at 9:00PM Apr 22, 2019Observed: 8.95 ft at 9:15PM Apr 22, 2019Observed: 8.93 ft at 9:30PM Apr 22, 2019Observed: 8.92 ft at 9:45PM Apr 22, 2019Observed: 8.91 ft at 10:00PM Apr 22, 2019Observed: 8.89 ft at 10:15PM Apr 22, 2019Observed: 8.88 ft at 10:30PM Apr 22, 2019Observed: 8.87 ft at 10:45PM Apr 22, 2019Observed: 8.85 ft at 11:00PM Apr 22, 2019Observed: 8.84 ft at 11:15PM Apr 22, 2019Observed: 8.83 ft at 11:30PM Apr 22, 2019Observed: 8.81 ft at 11:45PM Apr 22, 2019Observed: 8.8 ft at 12:00AM Apr 23, 2019Observed: 8.78 ft at 12:15AM Apr 23, 2019Observed: 8.77 ft at 12:30AM Apr 23, 2019Observed: 8.76 ft at 12:45AM Apr 23, 2019Observed: 8.75 ft at 1:00AM Apr 23, 2019Observed: 8.73 ft at 1:15AM Apr 23, 2019Observed: 8.72 ft at 1:30AM Apr 23, 2019Observed: 8.71 ft at 1:45AM Apr 23, 2019Observed: 8.69 ft at 2:00AM Apr 23, 2019Observed: 8.68 ft at 2:15AM Apr 23, 2019Observed: 8.67 ft at 2:30AM Apr 23, 2019Observed: 8.66 ft at 2:45AM Apr 23, 2019Observed: 8.64 ft at 3:00AM Apr 23, 2019Observed: 8.63 ft at 3:15AM Apr 23, 2019Observed: 8.62 ft at 3:30AM Apr 23, 2019Observed: 8.61 ft at 3:45AM Apr 23, 2019Observed: 8.6 ft at 4:00AM Apr 23, 2019Observed: 8.58 ft at 4:15AM Apr 23, 2019Observed: 8.57 ft at 4:30AM Apr 23, 2019Observed: 8.56 ft at 4:45AM Apr 23, 2019Observed: 8.55 ft at 5:00AM Apr 23, 2019Observed: 8.54 ft at 5:15AM Apr 23, 2019Observed: 8.52 ft at 5:30AM Apr 23, 2019Observed: 8.51 ft at 5:45AM Apr 23, 2019Observed: 8.5 ft at 6:00AM Apr 23, 2019Observed: 8.49 ft at 6:15AM Apr 23, 2019Observed: 8.48 ft at 6:30AM Apr 23, 2019Observed: 8.47 ft at 6:45AM Apr 23, 2019Observed: 8.45 ft at 7:00AM Apr 23, 2019Observed: 8.44 ft at 7:15AM Apr 23, 2019Observed: 8.43 ft at 7:30AM Apr 23, 2019Observed: 8.42 ft at 7:45AM Apr 23, 2019Observed: 8.41 ft at 8:00AM Apr 23, 2019Observed: 8.39 ft at 8:15AM Apr 23, 2019Observed: 8.38 ft at 8:30AM Apr 23, 2019Observed: 8.37 ft at 8:45AM Apr 23, 2019Observed: 8.36 ft at 9:00AM Apr 23, 2019Observed: 8.35 ft at 9:15AM Apr 23, 2019Observed: 8.34 ft at 9:30AM Apr 23, 2019Observed: 8.33 ft at 9:45AM Apr 23, 2019Observed: 8.32 ft at 10:00AM Apr 23, 2019Observed: 8.31 ft at 10:15AM Apr 23, 2019Observed: 8.3 ft at 10:30AM Apr 23, 2019Observed: 8.28 ft at 10:45AM Apr 23, 2019Observed: 8.27 ft at 11:00AM Apr 23, 2019Observed: 8.26 ft at 11:15AM Apr 23, 2019Observed: 8.25 ft at 11:30AM Apr 23, 2019Observed: 8.24 ft at 11:45AM Apr 23, 2019Observed: 8.23 ft at 12:00PM Apr 23, 2019Observed: 8.22 ft at 12:15PM Apr 23, 2019Observed: 8.21 ft at 12:30PM Apr 23, 2019Observed: 8.2 ft at 12:45PM Apr 23, 2019Observed: 8.19 ft at 1:00PM Apr 23, 2019Observed: 8.18 ft at 1:15PM Apr 23, 2019Highest Forecast: 8.2 ft 2:00PM Apr 23, 2019Forecast: 7.9 ft 8:00PM Apr 23, 2019Forecast: 7.7 ft 2:00AM Apr 24, 2019Forecast: 7.6 ft 8:00AM Apr 24, 2019Forecast: 7.4 ft 2:00PM Apr 24, 2019Forecast: 7.2 ft 8:00PM Apr 24, 2019Forecast: 7.1 ft 2:00AM Apr 25, 2019Forecast: 7 ft 8:00AM Apr 25, 2019Forecast: 6.8 ft 2:00PM Apr 25, 2019Forecast: 6.7 ft 8:00PM Apr 25, 2019Forecast: 6.7 ft 2:00AM Apr 26, 2019Forecast: 6.6 ft 8:00AM Apr 26, 2019USGS--Water Resources of the United StatesHNKM2(plotting HGIRG) Graph Created (1:54PM Apr 23, 2019)ObservedForecast (issued 10:33AM Apr 23)Latest observed value: 8.18 ft at 1:15 PM EDT 23-Apr-2019. Flood Stage is 30 ft
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Tabular Data (UTC)
Tabular Data (EDT)
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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 Dam Number Five
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
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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 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.
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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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