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Hydrograph River at a Glance Download
St. Marys River at Great Mills Stage (ft)Flow (cfs)Highest Observation: 2.22 ft at 3:45PM Sep 18, 2020Observed: 2.21 ft at 4:00PM Sep 18, 2020Observed: 2.21 ft at 4:15PM Sep 18, 2020Observed: 2.2 ft at 4:30PM Sep 18, 2020Observed: 2.2 ft at 4:45PM Sep 18, 2020Observed: 2.2 ft at 5:00PM Sep 18, 2020Observed: 2.19 ft at 5:15PM Sep 18, 2020Observed: 2.18 ft at 5:30PM Sep 18, 2020Observed: 2.19 ft at 5:45PM Sep 18, 2020Observed: 2.18 ft at 6:00PM Sep 18, 2020Observed: 2.18 ft at 6:15PM Sep 18, 2020Observed: 2.18 ft at 6:30PM Sep 18, 2020Observed: 2.17 ft at 6:45PM Sep 18, 2020Observed: 2.17 ft at 7:00PM Sep 18, 2020Observed: 2.16 ft at 7:15PM Sep 18, 2020Observed: 2.16 ft at 7:30PM Sep 18, 2020Observed: 2.16 ft at 7:45PM Sep 18, 2020Observed: 2.15 ft at 8:00PM Sep 18, 2020Observed: 2.15 ft at 8:15PM Sep 18, 2020Observed: 2.15 ft at 8:30PM Sep 18, 2020Observed: 2.14 ft at 8:45PM Sep 18, 2020Observed: 2.14 ft at 9:00PM Sep 18, 2020Observed: 2.14 ft at 9:15PM Sep 18, 2020Observed: 2.14 ft at 9:30PM Sep 18, 2020Observed: 2.13 ft at 9:45PM Sep 18, 2020Observed: 2.13 ft at 10:00PM Sep 18, 2020Observed: 2.12 ft at 10:15PM Sep 18, 2020Observed: 2.13 ft at 10:30PM Sep 18, 2020Observed: 2.12 ft at 10:45PM Sep 18, 2020Observed: 2.12 ft at 11:00PM Sep 18, 2020Observed: 2.12 ft at 11:15PM Sep 18, 2020Observed: 2.11 ft at 11:30PM Sep 18, 2020Observed: 2.11 ft at 11:45PM Sep 18, 2020Observed: 2.11 ft at 12:00AM Sep 19, 2020Observed: 2.11 ft at 12:15AM Sep 19, 2020Observed: 2.1 ft at 12:30AM Sep 19, 2020Observed: 2.1 ft at 12:45AM Sep 19, 2020Observed: 2.09 ft at 1:00AM Sep 19, 2020Observed: 2.08 ft at 1:30AM Sep 19, 2020Observed: 2.08 ft at 1:45AM Sep 19, 2020Observed: 2.08 ft at 2:00AM Sep 19, 2020Observed: 2.08 ft at 2:15AM Sep 19, 2020Observed: 2.07 ft at 2:30AM Sep 19, 2020Observed: 2.07 ft at 2:45AM Sep 19, 2020Observed: 2.06 ft at 3:00AM Sep 19, 2020Observed: 2.07 ft at 3:15AM Sep 19, 2020Observed: 2.06 ft at 3:30AM Sep 19, 2020Observed: 2.06 ft at 3:45AM Sep 19, 2020Observed: 2.06 ft at 4:00AM Sep 19, 2020Observed: 2.05 ft at 4:15AM Sep 19, 2020Observed: 2.05 ft at 4:30AM Sep 19, 2020Observed: 2.05 ft at 4:45AM Sep 19, 2020Observed: 2.05 ft at 5:00AM Sep 19, 2020Observed: 2.05 ft at 5:15AM Sep 19, 2020Observed: 2.04 ft at 5:30AM Sep 19, 2020Observed: 2.04 ft at 5:45AM Sep 19, 2020Observed: 2.04 ft at 6:00AM Sep 19, 2020Observed: 2.04 ft at 6:15AM Sep 19, 2020Observed: 2.04 ft at 6:30AM Sep 19, 2020Observed: 2.04 ft at 6:45AM Sep 19, 2020Observed: 2.03 ft at 7:00AM Sep 19, 2020Observed: 2.03 ft at 7:15AM Sep 19, 2020Observed: 2.03 ft at 7:30AM Sep 19, 2020Observed: 2.03 ft at 7:45AM Sep 19, 2020Observed: 2.02 ft at 8:00AM Sep 19, 2020Observed: 2.02 ft at 8:15AM Sep 19, 2020Observed: 2.02 ft at 8:30AM Sep 19, 2020Observed: 2.02 ft at 8:45AM Sep 19, 2020Observed: 2.02 ft at 9:00AM Sep 19, 2020Observed: 2.01 ft at 9:15AM Sep 19, 2020Observed: 2.01 ft at 9:30AM Sep 19, 2020Observed: 2 ft at 9:45AM Sep 19, 2020Observed: 2 ft at 10:00AM Sep 19, 2020Observed: 2 ft at 10:15AM Sep 19, 2020Observed: 2 ft at 10:30AM Sep 19, 2020Observed: 1.99 ft at 10:45AM Sep 19, 2020Observed: 1.99 ft at 11:00AM Sep 19, 2020Observed: 2 ft at 11:15AM Sep 19, 2020Observed: 2 ft at 11:30AM Sep 19, 2020Observed: 1.99 ft at 11:45AM Sep 19, 2020Observed: 1.99 ft at 12:00PM Sep 19, 2020Observed: 1.97 ft at 12:15PM Sep 19, 2020Observed: 1.98 ft at 12:30PM Sep 19, 2020Observed: 1.99 ft at 12:45PM Sep 19, 2020Observed: 1.99 ft at 1:00PM Sep 19, 2020Observed: 1.98 ft at 1:15PM Sep 19, 2020Observed: 1.98 ft at 1:30PM Sep 19, 2020Observed: 1.98 ft at 1:45PM Sep 19, 2020Observed: 1.98 ft at 2:00PM Sep 19, 2020Observed: 1.97 ft at 2:15PM Sep 19, 2020Observed: 1.97 ft at 2:30PM Sep 19, 2020Observed: 1.97 ft at 2:45PM Sep 19, 2020Observed: 1.98 ft at 3:00PM Sep 19, 2020Observed: 1.97 ft at 3:15PM Sep 19, 2020Observed: 1.96 ft at 3:30PM Sep 19, 2020Observed: 1.96 ft at 3:45PM Sep 19, 2020Observed: 1.96 ft at 4:00PM Sep 19, 2020Observed: 1.96 ft at 4:15PM Sep 19, 2020Observed: 1.95 ft at 4:30PM Sep 19, 2020Observed: 1.95 ft at 4:45PM Sep 19, 2020Observed: 1.95 ft at 5:00PM Sep 19, 2020Observed: 1.95 ft at 5:15PM Sep 19, 2020Observed: 1.94 ft at 5:30PM Sep 19, 2020Observed: 1.94 ft at 5:45PM Sep 19, 2020Observed: 1.93 ft at 6:00PM Sep 19, 2020Observed: 1.93 ft at 6:15PM Sep 19, 2020Observed: 1.93 ft at 6:30PM Sep 19, 2020Observed: 1.92 ft at 6:45PM Sep 19, 2020Observed: 1.93 ft at 7:00PM Sep 19, 2020Observed: 1.92 ft at 7:15PM Sep 19, 2020Observed: 1.92 ft at 7:30PM Sep 19, 2020Observed: 1.92 ft at 7:45PM Sep 19, 2020Observed: 1.92 ft at 8:00PM Sep 19, 2020Observed: 1.91 ft at 8:15PM Sep 19, 2020Observed: 1.92 ft at 8:30PM Sep 19, 2020Observed: 1.92 ft at 8:45PM Sep 19, 2020Observed: 1.91 ft at 9:00PM Sep 19, 2020Observed: 1.91 ft at 9:15PM Sep 19, 2020Observed: 1.91 ft at 9:30PM Sep 19, 2020Observed: 1.91 ft at 9:45PM Sep 19, 2020Observed: 1.91 ft at 10:00PM Sep 19, 2020Observed: 1.9 ft at 10:15PM Sep 19, 2020Observed: 1.9 ft at 10:30PM Sep 19, 2020Observed: 1.9 ft at 10:45PM Sep 19, 2020Observed: 1.9 ft at 11:00PM Sep 19, 2020Observed: 1.9 ft at 11:15PM Sep 19, 2020Observed: 1.89 ft at 11:30PM Sep 19, 2020Observed: 1.9 ft at 11:45PM Sep 19, 2020Observed: 1.89 ft at 12:00AM Sep 20, 2020Observed: 1.9 ft at 12:15AM Sep 20, 2020Observed: 1.9 ft at 12:30AM Sep 20, 2020Observed: 1.9 ft at 12:45AM Sep 20, 2020Observed: 1.88 ft at 1:00AM Sep 20, 2020Observed: 1.89 ft at 1:15AM Sep 20, 2020Observed: 1.89 ft at 1:30AM Sep 20, 2020Observed: 1.89 ft at 1:45AM Sep 20, 2020Observed: 1.88 ft at 2:00AM Sep 20, 2020Observed: 1.88 ft at 2:15AM Sep 20, 2020Observed: 1.88 ft at 2:30AM Sep 20, 2020Observed: 1.88 ft at 2:45AM Sep 20, 2020Observed: 1.88 ft at 3:00AM Sep 20, 2020Observed: 1.88 ft at 3:15AM Sep 20, 2020Observed: 1.88 ft at 3:30AM Sep 20, 2020Observed: 1.87 ft at 3:45AM Sep 20, 2020Observed: 1.88 ft at 4:00AM Sep 20, 2020Observed: 1.88 ft at 4:15AM Sep 20, 2020Observed: 1.87 ft at 4:30AM Sep 20, 2020Observed: 1.87 ft at 4:45AM Sep 20, 2020Observed: 1.88 ft at 5:00AM Sep 20, 2020Observed: 1.87 ft at 5:15AM Sep 20, 2020Observed: 1.87 ft at 5:30AM Sep 20, 2020Observed: 1.87 ft at 5:45AM Sep 20, 2020Observed: 1.87 ft at 6:00AM Sep 20, 2020Observed: 1.87 ft at 6:15AM Sep 20, 2020Observed: 1.86 ft at 6:30AM Sep 20, 2020Observed: 1.87 ft at 6:45AM Sep 20, 2020Observed: 1.87 ft at 7:00AM Sep 20, 2020Observed: 1.86 ft at 7:15AM Sep 20, 2020Observed: 1.87 ft at 7:30AM Sep 20, 2020Observed: 1.86 ft at 7:45AM Sep 20, 2020Observed: 1.87 ft at 8:00AM Sep 20, 2020Observed: 1.87 ft at 8:15AM Sep 20, 2020Observed: 1.86 ft at 8:30AM Sep 20, 2020Observed: 1.86 ft at 8:45AM Sep 20, 2020Observed: 1.87 ft at 9:00AM Sep 20, 2020Observed: 1.86 ft at 9:15AM Sep 20, 2020Observed: 1.86 ft at 9:30AM Sep 20, 2020Observed: 1.86 ft at 9:45AM Sep 20, 2020Observed: 1.86 ft at 10:00AM Sep 20, 2020Observed: 1.86 ft at 10:15AM Sep 20, 2020Observed: 1.86 ft at 10:30AM Sep 20, 2020Observed: 1.86 ft at 10:45AM Sep 20, 2020Observed: 1.87 ft at 11:00AM Sep 20, 2020Observed: 1.86 ft at 11:15AM Sep 20, 2020Observed: 1.85 ft at 11:30AM Sep 20, 2020Observed: 1.85 ft at 11:45AM Sep 20, 2020Observed: 1.83 ft at 12:00PM Sep 20, 2020Observed: 1.85 ft at 12:15PM Sep 20, 2020Observed: 1.85 ft at 12:30PM Sep 20, 2020Observed: 1.85 ft at 12:45PM Sep 20, 2020Observed: 1.85 ft at 1:00PM Sep 20, 2020Observed: 1.85 ft at 1:15PM Sep 20, 2020Observed: 1.85 ft at 1:30PM Sep 20, 2020Observed: 1.85 ft at 1:45PM Sep 20, 2020Observed: 1.84 ft at 2:00PM Sep 20, 2020Observed: 1.83 ft at 2:15PM Sep 20, 2020Observed: 1.84 ft at 2:30PM Sep 20, 2020Observed: 1.84 ft at 2:45PM Sep 20, 2020Observed: 1.84 ft at 3:00PM Sep 20, 2020Observed: 1.84 ft at 3:15PM Sep 20, 2020Observed: 1.84 ft at 3:30PM Sep 20, 2020Observed: 1.84 ft at 3:45PM Sep 20, 2020Observed: 1.84 ft at 4:00PM Sep 20, 2020Observed: 1.83 ft at 4:15PM Sep 20, 2020Observed: 1.84 ft at 4:30PM Sep 20, 2020Observed: 1.84 ft at 4:45PM Sep 20, 2020Observed: 1.83 ft at 5:00PM Sep 20, 2020Observed: 1.83 ft at 5:15PM Sep 20, 2020Observed: 1.83 ft at 5:30PM Sep 20, 2020Observed: 1.82 ft at 5:45PM Sep 20, 2020Observed: 1.82 ft at 6:00PM Sep 20, 2020Observed: 1.82 ft at 6:15PM Sep 20, 2020Observed: 1.81 ft at 6:30PM Sep 20, 2020Observed: 1.81 ft at 6:45PM Sep 20, 2020Observed: 1.81 ft at 7:00PM Sep 20, 2020Observed: 1.81 ft at 7:15PM Sep 20, 2020Observed: 1.81 ft at 7:30PM Sep 20, 2020Observed: 1.8 ft at 7:45PM Sep 20, 2020Observed: 1.81 ft at 8:00PM Sep 20, 2020Observed: 1.8 ft at 8:15PM Sep 20, 2020Observed: 1.8 ft at 8:30PM Sep 20, 2020Observed: 1.8 ft at 8:45PM Sep 20, 2020Observed: 1.8 ft at 9:00PM Sep 20, 2020Observed: 1.8 ft at 9:15PM Sep 20, 2020Observed: 1.8 ft at 9:30PM Sep 20, 2020Observed: 1.8 ft at 9:45PM Sep 20, 2020Observed: 1.8 ft at 10:00PM Sep 20, 2020Observed: 1.8 ft at 10:15PM Sep 20, 2020Observed: 1.79 ft at 10:30PM Sep 20, 2020Observed: 1.79 ft at 10:45PM Sep 20, 2020Observed: 1.8 ft at 11:00PM Sep 20, 2020Observed: 1.8 ft at 11:15PM Sep 20, 2020Observed: 1.8 ft at 11:30PM Sep 20, 2020Observed: 1.79 ft at 11:45PM Sep 20, 2020Observed: 1.79 ft at 12:00AM Sep 21, 2020Observed: 1.79 ft at 12:15AM Sep 21, 2020Observed: 1.8 ft at 12:30AM Sep 21, 2020Observed: 1.79 ft at 12:45AM Sep 21, 2020Observed: 1.79 ft at 1:00AM Sep 21, 2020Observed: 1.79 ft at 1:15AM Sep 21, 2020Observed: 1.79 ft at 1:30AM Sep 21, 2020Observed: 1.79 ft at 1:45AM Sep 21, 2020Observed: 1.79 ft at 2:00AM Sep 21, 2020Observed: 1.79 ft at 2:15AM Sep 21, 2020Observed: 1.79 ft at 2:30AM Sep 21, 2020Observed: 1.79 ft at 2:45AM Sep 21, 2020Observed: 1.79 ft at 3:00AM Sep 21, 2020Observed: 1.79 ft at 3:15AM Sep 21, 2020Observed: 1.79 ft at 3:30AM Sep 21, 2020Observed: 1.79 ft at 3:45AM Sep 21, 2020Observed: 1.79 ft at 4:00AM Sep 21, 2020Observed: 1.79 ft at 4:15AM Sep 21, 2020Observed: 1.79 ft at 4:30AM Sep 21, 2020Observed: 1.79 ft at 4:45AM Sep 21, 2020Observed: 1.79 ft at 5:00AM Sep 21, 2020Observed: 1.79 ft at 5:15AM Sep 21, 2020Observed: 1.79 ft at 5:30AM Sep 21, 2020Observed: 1.79 ft at 5:45AM Sep 21, 2020Observed: 1.79 ft at 6:00AM Sep 21, 2020Observed: 1.79 ft at 6:15AM Sep 21, 2020Observed: 1.78 ft at 6:30AM Sep 21, 2020Observed: 1.78 ft at 6:45AM Sep 21, 2020Observed: 1.79 ft at 7:00AM Sep 21, 2020Observed: 1.78 ft at 7:15AM Sep 21, 2020Observed: 1.78 ft at 7:30AM Sep 21, 2020Observed: 1.78 ft at 7:45AM Sep 21, 2020Observed: 1.78 ft at 8:00AM Sep 21, 2020Observed: 1.78 ft at 8:15AM Sep 21, 2020Observed: 1.78 ft at 8:30AM Sep 21, 2020Observed: 1.78 ft at 8:45AM Sep 21, 2020Observed: 1.77 ft at 9:00AM Sep 21, 2020Observed: 1.75 ft at 9:15AM Sep 21, 2020Observed: 1.76 ft at 9:30AM Sep 21, 2020Observed: 1.78 ft at 9:45AM Sep 21, 2020Observed: 1.77 ft at 10:00AM Sep 21, 2020Observed: 1.78 ft at 10:15AM Sep 21, 2020Observed: 1.78 ft at 10:30AM Sep 21, 2020Observed: 1.78 ft at 10:45AM Sep 21, 2020Observed: 1.78 ft at 11:00AM Sep 21, 2020Observed: 1.77 ft at 11:15AM Sep 21, 2020Observed: 1.75 ft at 11:30AM Sep 21, 2020Observed: 1.75 ft at 11:45AM Sep 21, 2020Observed: 1.76 ft at 12:00PM Sep 21, 2020Observed: 1.76 ft at 12:15PM Sep 21, 2020Observed: 1.76 ft at 12:30PM Sep 21, 2020Observed: 1.77 ft at 12:45PM Sep 21, 2020Observed: 1.77 ft at 1:00PM Sep 21, 2020Observed: 1.77 ft at 1:15PM Sep 21, 2020Observed: 1.77 ft at 1:30PM Sep 21, 2020Observed: 1.77 ft at 1:45PM Sep 21, 2020Observed: 1.76 ft at 2:00PM Sep 21, 2020Observed: 1.75 ft at 2:15PM Sep 21, 2020Observed: 1.75 ft at 2:30PM Sep 21, 2020Observed: 1.76 ft at 2:45PM Sep 21, 2020Observed: 1.77 ft at 3:00PM Sep 21, 2020Observed: 1.76 ft at 3:15PM Sep 21, 2020Observed: 1.76 ft at 3:30PM Sep 21, 2020Observed: 1.76 ft at 3:45PM Sep 21, 2020Observed: 1.76 ft at 4:00PM Sep 21, 2020Observed: 1.76 ft at 4:15PM Sep 21, 2020Observed: 1.76 ft at 4:30PM Sep 21, 2020Observed: 1.76 ft at 4:45PM Sep 21, 2020Observed: 1.76 ft at 5:00PM Sep 21, 2020Observed: 1.76 ft at 5:15PM Sep 21, 2020Observed: 1.75 ft at 5:30PM Sep 21, 2020Observed: 1.75 ft at 5:45PM Sep 21, 2020Observed: 1.75 ft at 6:00PM Sep 21, 2020Observed: 1.75 ft at 6:15PM Sep 21, 2020Observed: 1.74 ft at 6:30PM Sep 21, 2020Observed: 1.74 ft at 6:45PM Sep 21, 2020Observed: 1.74 ft at 7:00PM Sep 21, 2020Observed: 1.74 ft at 7:15PM Sep 21, 2020Observed: 1.74 ft at 7:30PM Sep 21, 2020Observed: 1.74 ft at 7:45PM Sep 21, 2020Observed: 1.74 ft at 8:00PM Sep 21, 2020Observed: 1.74 ft at 8:15PM Sep 21, 2020Observed: 1.75 ft at 8:30PM Sep 21, 2020Observed: 1.74 ft at 8:45PM Sep 21, 2020Observed: 1.74 ft at 9:00PM Sep 21, 2020Observed: 1.74 ft at 9:15PM Sep 21, 2020Observed: 1.74 ft at 9:30PM Sep 21, 2020Observed: 1.74 ft at 9:45PM Sep 21, 2020Observed: 1.74 ft at 10:00PM Sep 21, 2020Observed: 1.73 ft at 10:15PM Sep 21, 2020Observed: 1.74 ft at 10:30PM Sep 21, 2020Observed: 1.73 ft at 10:45PM Sep 21, 2020Observed: 1.73 ft at 11:00PM Sep 21, 2020Observed: 1.73 ft at 11:15PM Sep 21, 2020Observed: 1.73 ft at 11:30PM Sep 21, 2020Observed: 1.73 ft at 11:45PM Sep 21, 2020Observed: 1.74 ft at 12:00AM Sep 22, 2020Observed: 1.74 ft at 12:15AM Sep 22, 2020Observed: 1.73 ft at 12:30AM Sep 22, 2020Observed: 1.73 ft at 12:45AM Sep 22, 2020Observed: 1.73 ft at 1:00AM Sep 22, 2020Observed: 1.73 ft at 1:15AM Sep 22, 2020Observed: 1.73 ft at 1:30AM Sep 22, 2020Observed: 1.73 ft at 1:45AM Sep 22, 2020Observed: 1.73 ft at 2:00AM Sep 22, 2020Observed: 1.73 ft at 2:15AM Sep 22, 2020Observed: 1.73 ft at 2:30AM Sep 22, 2020Observed: 1.73 ft at 2:45AM Sep 22, 2020Observed: 1.73 ft at 3:00AM Sep 22, 2020Observed: 1.73 ft at 3:15AM Sep 22, 2020Observed: 1.73 ft at 3:30AM Sep 22, 2020Observed: 1.73 ft at 3:45AM Sep 22, 2020Observed: 1.73 ft at 4:00AM Sep 22, 2020Observed: 1.73 ft at 4:15AM Sep 22, 2020Observed: 1.73 ft at 4:30AM Sep 22, 2020Observed: 1.73 ft at 4:45AM Sep 22, 2020Observed: 1.73 ft at 5:00AM Sep 22, 2020Observed: 1.73 ft at 5:15AM Sep 22, 2020Observed: 1.73 ft at 5:30AM Sep 22, 2020Observed: 1.73 ft at 5:45AM Sep 22, 2020Observed: 1.73 ft at 6:00AM Sep 22, 2020Observed: 1.73 ft at 6:15AM Sep 22, 2020Observed: 1.73 ft at 6:30AM Sep 22, 2020Observed: 1.73 ft at 6:45AM Sep 22, 2020Observed: 1.73 ft at 7:00AM Sep 22, 2020Observed: 1.73 ft at 7:15AM Sep 22, 2020Observed: 1.73 ft at 7:30AM Sep 22, 2020Observed: 1.73 ft at 7:45AM Sep 22, 2020Observed: 1.73 ft at 8:00AM Sep 22, 2020Observed: 1.73 ft at 8:15AM Sep 22, 2020Observed: 1.74 ft at 8:30AM Sep 22, 2020Observed: 1.74 ft at 8:45AM Sep 22, 2020Observed: 1.73 ft at 9:00AM Sep 22, 2020Observed: 1.74 ft at 9:15AM Sep 22, 2020Observed: 1.74 ft at 9:30AM Sep 22, 2020Observed: 1.74 ft at 9:45AM Sep 22, 2020Observed: 1.74 ft at 10:00AM Sep 22, 2020Observed: 1.73 ft at 10:15AM Sep 22, 2020Observed: 1.74 ft at 10:30AM Sep 22, 2020Observed: 1.74 ft at 10:45AM Sep 22, 2020Observed: 1.74 ft at 11:00AM Sep 22, 2020Observed: 1.74 ft at 11:15AM Sep 22, 2020Observed: 1.72 ft at 11:30AM Sep 22, 2020Observed: 1.73 ft at 11:45AM Sep 22, 2020Observed: 1.73 ft at 12:00PM Sep 22, 2020Observed: 1.73 ft at 12:15PM Sep 22, 2020Observed: 1.73 ft at 12:30PM Sep 22, 2020Observed: 1.74 ft at 12:45PM Sep 22, 2020Observed: 1.74 ft at 1:00PM Sep 22, 2020Observed: 1.74 ft at 1:15PM Sep 22, 2020Observed: 1.74 ft at 1:30PM Sep 22, 2020Observed: 1.73 ft at 1:45PM Sep 22, 2020Observed: 1.72 ft at 2:00PM Sep 22, 2020Observed: 1.73 ft at 2:15PM Sep 22, 2020Observed: 1.72 ft at 2:30PM Sep 22, 2020Observed: 1.73 ft at 2:45PM Sep 22, 2020Observed: 1.73 ft at 3:00PM Sep 22, 2020Observed: 1.73 ft at 3:15PM Sep 22, 2020Observed: 1.74 ft at 3:30PM Sep 22, 2020Observed: 1.73 ft at 3:45PM Sep 22, 2020Observed: 1.74 ft at 4:00PM Sep 22, 2020Observed: 1.73 ft at 4:15PM Sep 22, 2020Observed: 1.74 ft at 4:30PM Sep 22, 2020Observed: 1.73 ft at 4:45PM Sep 22, 2020Observed: 1.73 ft at 5:00PM Sep 22, 2020Observed: 1.73 ft at 5:15PM Sep 22, 2020Observed: 1.73 ft at 5:30PM Sep 22, 2020Observed: 1.73 ft at 5:45PM Sep 22, 2020Observed: 1.73 ft at 6:00PM Sep 22, 2020Observed: 1.72 ft at 6:15PM Sep 22, 2020Observed: 1.72 ft at 6:30PM Sep 22, 2020Observed: 1.72 ft at 6:45PM Sep 22, 2020Observed: 1.72 ft at 7:00PM Sep 22, 2020Observed: 1.71 ft at 7:15PM Sep 22, 2020Observed: 1.71 ft at 7:30PM Sep 22, 2020Observed: 1.71 ft at 7:45PM Sep 22, 2020Observed: 1.71 ft at 8:00PM Sep 22, 2020Observed: 1.71 ft at 8:15PM Sep 22, 2020Observed: 1.71 ft at 8:30PM Sep 22, 2020Observed: 1.71 ft at 8:45PM Sep 22, 2020Observed: 1.71 ft at 9:00PM Sep 22, 2020Observed: 1.71 ft at 9:15PM Sep 22, 2020Observed: 1.71 ft at 9:30PM Sep 22, 2020Observed: 1.71 ft at 9:45PM Sep 22, 2020Observed: 1.71 ft at 10:00PM Sep 22, 2020Observed: 1.71 ft at 10:15PM Sep 22, 2020Observed: 1.71 ft at 10:30PM Sep 22, 2020Observed: 1.71 ft at 10:45PM Sep 22, 2020Observed: 1.71 ft at 11:00PM Sep 22, 2020Observed: 1.71 ft at 11:15PM Sep 22, 2020Observed: 1.71 ft at 11:30PM Sep 22, 2020Observed: 1.71 ft at 11:45PM Sep 22, 2020Observed: 1.71 ft at 12:00AM Sep 23, 2020Observed: 1.71 ft at 12:15AM Sep 23, 2020Observed: 1.71 ft at 12:30AM Sep 23, 2020Observed: 1.71 ft at 12:45AM Sep 23, 2020Observed: 1.71 ft at 1:00AM Sep 23, 2020Observed: 1.71 ft at 1:15AM Sep 23, 2020Observed: 1.71 ft at 1:30AM Sep 23, 2020Observed: 1.71 ft at 1:45AM Sep 23, 2020Observed: 1.71 ft at 2:00AM Sep 23, 2020Observed: 1.71 ft at 2:15AM Sep 23, 2020Observed: 1.71 ft at 2:30AM Sep 23, 2020Observed: 1.71 ft at 2:45AM Sep 23, 2020Observed: 1.71 ft at 3:00AM Sep 23, 2020Observed: 1.71 ft at 3:15AM Sep 23, 2020Observed: 1.71 ft at 3:30AM Sep 23, 2020Observed: 1.71 ft at 3:45AM Sep 23, 2020Observed: 1.71 ft at 4:00AM Sep 23, 2020Observed: 1.71 ft at 4:15AM Sep 23, 2020Observed: 1.71 ft at 4:30AM Sep 23, 2020Observed: 1.71 ft at 4:45AM Sep 23, 2020Observed: 1.71 ft at 5:00AM Sep 23, 2020Observed: 1.71 ft at 5:15AM Sep 23, 2020Observed: 1.71 ft at 5:30AM Sep 23, 2020Observed: 1.71 ft at 5:45AM Sep 23, 2020Observed: 1.71 ft at 6:00AM Sep 23, 2020Observed: 1.71 ft at 6:15AM Sep 23, 2020Observed: 1.71 ft at 6:30AM Sep 23, 2020Observed: 1.71 ft at 6:45AM Sep 23, 2020Observed: 1.71 ft at 7:00AM Sep 23, 2020Observed: 1.71 ft at 7:15AM Sep 23, 2020Observed: 1.71 ft at 7:30AM Sep 23, 2020Observed: 1.71 ft at 7:45AM Sep 23, 2020Observed: 1.71 ft at 8:00AM Sep 23, 2020Observed: 1.71 ft at 8:15AM Sep 23, 2020Observed: 1.71 ft at 8:30AM Sep 23, 2020Observed: 1.72 ft at 8:45AM Sep 23, 2020Observed: 1.71 ft at 9:00AM Sep 23, 2020Observed: 1.71 ft at 9:15AM Sep 23, 2020Observed: 1.71 ft at 9:30AM Sep 23, 2020Observed: 1.71 ft at 9:45AM Sep 23, 2020Observed: 1.71 ft at 10:00AM Sep 23, 2020Observed: 1.71 ft at 10:15AM Sep 23, 2020Observed: 1.7 ft at 10:30AM Sep 23, 2020Observed: 1.7 ft at 10:45AM Sep 23, 2020Observed: 1.71 ft at 11:00AM Sep 23, 2020Observed: 1.7 ft at 11:15AM Sep 23, 2020Observed: 1.69 ft at 11:30AM Sep 23, 2020Observed: 1.7 ft at 11:45AM Sep 23, 2020Observed: 1.71 ft at 12:00PM Sep 23, 2020Observed: 1.71 ft at 12:15PM Sep 23, 2020Observed: 1.71 ft at 12:30PM Sep 23, 2020Observed: 1.71 ft at 12:45PM Sep 23, 2020Observed: 1.71 ft at 1:00PM Sep 23, 2020Observed: 1.7 ft at 1:15PM Sep 23, 2020Observed: 1.71 ft at 1:30PM Sep 23, 2020Observed: 1.71 ft at 1:45PM Sep 23, 2020Observed: 1.69 ft at 2:00PM Sep 23, 2020USGS--Water Resources of the United StatesGMRM2(plotting HGIRG) Graph Created (3:40PM Sep 23, 2020)ObservedLatest observed value: 1.69 ft at 2:00 PM EDT 23-Sep-2020. Flood Stage is 6 ft
Printable Image
About this graph
Tabular Data (UTC)
Tabular Data (EDT)
XML Data
RSS Files
Datum: Not Available
Metadata
NOTE: Forecasts are not available for the St. Marys River at Great Mills. Only observed stages are available for this point.
Return to Area Map
Flood Categories (in feet)
Major Flood Stage: 10
Moderate Flood Stage: 8
Flood Stage: 6
Action Stage: 5
Low Stage (in feet): -9999

Historic Crests
(1) 13.34 ft on 08/20/1969
(2) 12.98 ft on 08/28/2011
(3) 12.82 ft on 09/16/1999
(4) 12.08 ft on 07/30/1960
(5) 11.77 ft on 08/13/1955
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 7.45 ft on 07/08/2019 (P)
(2) 6.00 ft on 11/25/2018
(3) 6.19 ft on 07/22/2018
(4) 7.90 ft on 05/20/2018
(5) 6.77 ft on 07/06/2017
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(P): Preliminary values subject to further review.

Low Water Records
Currently none available.

For more information on your flood risk go to www.floodsmart.gov.
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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.
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10 Widespread flooding is occurring in Great Mills with water approaching homes and businesses.
8 Indian Bridge Road begins to flood as flooding becomes more widespread in Great Mills.
6 Flat Iron Road begins to flood with water in some yards in Great Mills.
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Latitude: 38.241667° N, Longitude: 76.503611° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 6 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 Not Available Not Available 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:
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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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