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Hydrograph River at a Glance Download
St. Marys River at Great Mills Stage (ft)Flow (cfs)Observed: 1.86 ft at 5:30PM Jun 14, 2021Observed: 1.86 ft at 5:45PM Jun 14, 2021Observed: 1.87 ft at 6:00PM Jun 14, 2021Observed: 1.87 ft at 6:15PM Jun 14, 2021Observed: 1.87 ft at 6:30PM Jun 14, 2021Observed: 1.87 ft at 6:45PM Jun 14, 2021Observed: 1.87 ft at 7:00PM Jun 14, 2021Observed: 1.86 ft at 7:15PM Jun 14, 2021Observed: 1.86 ft at 7:30PM Jun 14, 2021Observed: 1.85 ft at 7:45PM Jun 14, 2021Observed: 1.86 ft at 8:00PM Jun 14, 2021Observed: 1.86 ft at 8:15PM Jun 14, 2021Observed: 1.85 ft at 8:30PM Jun 14, 2021Observed: 1.86 ft at 8:45PM Jun 14, 2021Observed: 1.85 ft at 9:00PM Jun 14, 2021Observed: 1.85 ft at 9:15PM Jun 14, 2021Observed: 1.85 ft at 9:30PM Jun 14, 2021Observed: 1.85 ft at 9:45PM Jun 14, 2021Observed: 1.85 ft at 10:00PM Jun 14, 2021Observed: 1.85 ft at 10:15PM Jun 14, 2021Observed: 1.85 ft at 10:30PM Jun 14, 2021Observed: 1.84 ft at 10:45PM Jun 14, 2021Observed: 1.84 ft at 11:00PM Jun 14, 2021Observed: 1.84 ft at 11:30PM Jun 14, 2021Observed: 1.83 ft at 11:45PM Jun 14, 2021Observed: 1.83 ft at 12:00AM Jun 15, 2021Observed: 1.83 ft at 12:15AM Jun 15, 2021Observed: 1.83 ft at 12:30AM Jun 15, 2021Observed: 1.84 ft at 12:45AM Jun 15, 2021Observed: 1.83 ft at 1:00AM Jun 15, 2021Observed: 1.83 ft at 1:15AM Jun 15, 2021Observed: 1.83 ft at 1:30AM Jun 15, 2021Observed: 1.82 ft at 1:45AM Jun 15, 2021Observed: 1.83 ft at 2:00AM Jun 15, 2021Observed: 1.82 ft at 2:15AM Jun 15, 2021Observed: 1.82 ft at 2:30AM Jun 15, 2021Observed: 1.82 ft at 2:45AM Jun 15, 2021Observed: 1.83 ft at 3:00AM Jun 15, 2021Observed: 1.83 ft at 3:30AM Jun 15, 2021Observed: 1.83 ft at 3:45AM Jun 15, 2021Observed: 1.83 ft at 4:00AM Jun 15, 2021Observed: 1.83 ft at 4:15AM Jun 15, 2021Observed: 1.83 ft at 4:30AM Jun 15, 2021Observed: 1.83 ft at 4:45AM Jun 15, 2021Observed: 1.84 ft at 5:00AM Jun 15, 2021Observed: 1.84 ft at 5:15AM Jun 15, 2021Observed: 1.85 ft at 5:30AM Jun 15, 2021Observed: 1.86 ft at 5:45AM Jun 15, 2021Observed: 1.87 ft at 6:00AM Jun 15, 2021Highest Observation: 1.97 ft at 8:30AM Jun 15, 2021Observed: 1.96 ft at 8:45AM Jun 15, 2021Observed: 1.94 ft at 9:00AM Jun 15, 2021Observed: 1.95 ft at 9:15AM Jun 15, 2021Observed: 1.94 ft at 9:30AM Jun 15, 2021Observed: 1.93 ft at 9:45AM Jun 15, 2021Observed: 1.93 ft at 10:00AM Jun 15, 2021Observed: 1.92 ft at 10:15AM Jun 15, 2021Observed: 1.92 ft at 10:30AM Jun 15, 2021Observed: 1.92 ft at 10:45AM Jun 15, 2021Observed: 1.91 ft at 11:00AM Jun 15, 2021Observed: 1.92 ft at 11:15AM Jun 15, 2021Observed: 1.91 ft at 11:30AM Jun 15, 2021Observed: 1.9 ft at 11:45AM Jun 15, 2021Observed: 1.91 ft at 12:00PM Jun 15, 2021Observed: 1.9 ft at 12:15PM Jun 15, 2021Observed: 1.9 ft at 12:30PM Jun 15, 2021Observed: 1.89 ft at 12:45PM Jun 15, 2021Observed: 1.89 ft at 1:00PM Jun 15, 2021Observed: 1.88 ft at 1:15PM Jun 15, 2021Observed: 1.88 ft at 1:30PM Jun 15, 2021Observed: 1.87 ft at 1:45PM Jun 15, 2021Observed: 1.87 ft at 2:00PM Jun 15, 2021Observed: 1.87 ft at 2:15PM Jun 15, 2021Observed: 1.87 ft at 2:30PM Jun 15, 2021Observed: 1.86 ft at 2:45PM Jun 15, 2021Observed: 1.86 ft at 3:00PM Jun 15, 2021Observed: 1.86 ft at 3:15PM Jun 15, 2021Observed: 1.86 ft at 3:30PM Jun 15, 2021Observed: 1.86 ft at 3:45PM Jun 15, 2021Observed: 1.86 ft at 4:00PM Jun 15, 2021Observed: 1.85 ft at 4:15PM Jun 15, 2021Observed: 1.85 ft at 4:30PM Jun 15, 2021Observed: 1.85 ft at 4:45PM Jun 15, 2021Observed: 1.84 ft at 5:00PM Jun 15, 2021Observed: 1.84 ft at 5:15PM Jun 15, 2021Observed: 1.84 ft at 5:30PM Jun 15, 2021Observed: 1.84 ft at 5:45PM Jun 15, 2021Observed: 1.83 ft at 6:00PM Jun 15, 2021Observed: 1.83 ft at 6:15PM Jun 15, 2021Observed: 1.83 ft at 6:30PM Jun 15, 2021Observed: 1.83 ft at 6:45PM Jun 15, 2021Observed: 1.83 ft at 7:00PM Jun 15, 2021Observed: 1.83 ft at 7:15PM Jun 15, 2021Observed: 1.83 ft at 7:30PM Jun 15, 2021Observed: 1.83 ft at 7:45PM Jun 15, 2021Observed: 1.82 ft at 8:00PM Jun 15, 2021Observed: 1.82 ft at 8:15PM Jun 15, 2021Observed: 1.81 ft at 8:30PM Jun 15, 2021Observed: 1.81 ft at 8:45PM Jun 15, 2021Observed: 1.81 ft at 9:00PM Jun 15, 2021Observed: 1.81 ft at 9:15PM Jun 15, 2021Observed: 1.8 ft at 9:30PM Jun 15, 2021Observed: 1.8 ft at 9:45PM Jun 15, 2021Observed: 1.8 ft at 10:00PM Jun 15, 2021Observed: 1.81 ft at 10:15PM Jun 15, 2021Observed: 1.81 ft at 10:30PM Jun 15, 2021Observed: 1.8 ft at 10:45PM Jun 15, 2021Observed: 1.8 ft at 11:00PM Jun 15, 2021Observed: 1.8 ft at 11:15PM Jun 15, 2021Observed: 1.8 ft at 11:30PM Jun 15, 2021Observed: 1.81 ft at 11:45PM Jun 15, 2021Observed: 1.8 ft at 12:00AM Jun 16, 2021Observed: 1.8 ft at 12:15AM Jun 16, 2021Observed: 1.79 ft at 12:30AM Jun 16, 2021Observed: 1.79 ft at 12:45AM Jun 16, 2021Observed: 1.8 ft at 1:00AM Jun 16, 2021Observed: 1.79 ft at 1:15AM Jun 16, 2021Observed: 1.79 ft at 1:30AM Jun 16, 2021Observed: 1.8 ft at 1:45AM Jun 16, 2021Observed: 1.79 ft at 2:00AM Jun 16, 2021Observed: 1.79 ft at 2:15AM Jun 16, 2021Observed: 1.79 ft at 2:30AM Jun 16, 2021Observed: 1.79 ft at 2:45AM Jun 16, 2021Observed: 1.79 ft at 3:00AM Jun 16, 2021Observed: 1.79 ft at 3:15AM Jun 16, 2021Observed: 1.79 ft at 3:30AM Jun 16, 2021Observed: 1.79 ft at 3:45AM Jun 16, 2021Observed: 1.79 ft at 4:00AM Jun 16, 2021Observed: 1.79 ft at 4:15AM Jun 16, 2021Observed: 1.78 ft at 4:30AM Jun 16, 2021Observed: 1.79 ft at 4:45AM Jun 16, 2021Observed: 1.78 ft at 5:00AM Jun 16, 2021Observed: 1.78 ft at 5:15AM Jun 16, 2021Observed: 1.79 ft at 5:30AM Jun 16, 2021Observed: 1.78 ft at 5:45AM Jun 16, 2021Observed: 1.78 ft at 6:00AM Jun 16, 2021Observed: 1.78 ft at 6:15AM Jun 16, 2021Observed: 1.78 ft at 6:30AM Jun 16, 2021Observed: 1.78 ft at 6:45AM Jun 16, 2021Observed: 1.78 ft at 7:00AM Jun 16, 2021Observed: 1.78 ft at 7:15AM Jun 16, 2021Observed: 1.77 ft at 7:30AM Jun 16, 2021Observed: 1.77 ft at 7:45AM Jun 16, 2021Observed: 1.77 ft at 8:00AM Jun 16, 2021Observed: 1.77 ft at 8:15AM Jun 16, 2021Observed: 1.76 ft at 8:30AM Jun 16, 2021Observed: 1.76 ft at 8:45AM Jun 16, 2021Observed: 1.75 ft at 9:00AM Jun 16, 2021Observed: 1.75 ft at 9:15AM Jun 16, 2021Observed: 1.75 ft at 9:30AM Jun 16, 2021Observed: 1.74 ft at 9:45AM Jun 16, 2021Observed: 1.74 ft at 10:00AM Jun 16, 2021Observed: 1.74 ft at 10:15AM Jun 16, 2021Observed: 1.75 ft at 10:30AM Jun 16, 2021Observed: 1.75 ft at 10:45AM Jun 16, 2021Observed: 1.75 ft at 11:00AM Jun 16, 2021Observed: 1.72 ft at 2:15PM Jun 16, 2021Observed: 1.72 ft at 2:30PM Jun 16, 2021Observed: 1.72 ft at 2:45PM Jun 16, 2021Observed: 1.72 ft at 3:00PM Jun 16, 2021Observed: 1.72 ft at 3:15PM Jun 16, 2021Observed: 1.71 ft at 3:30PM Jun 16, 2021Observed: 1.72 ft at 3:45PM Jun 16, 2021Observed: 1.72 ft at 4:00PM Jun 16, 2021Observed: 1.71 ft at 4:15PM Jun 16, 2021Observed: 1.71 ft at 4:30PM Jun 16, 2021Observed: 1.71 ft at 4:45PM Jun 16, 2021Observed: 1.71 ft at 5:00PM Jun 16, 2021Observed: 1.71 ft at 5:15PM Jun 16, 2021Observed: 1.7 ft at 5:30PM Jun 16, 2021Observed: 1.7 ft at 5:45PM Jun 16, 2021Observed: 1.7 ft at 6:00PM Jun 16, 2021Observed: 1.7 ft at 6:15PM Jun 16, 2021Observed: 1.7 ft at 6:30PM Jun 16, 2021Observed: 1.7 ft at 6:45PM Jun 16, 2021Observed: 1.7 ft at 7:00PM Jun 16, 2021Observed: 1.7 ft at 7:15PM Jun 16, 2021Observed: 1.7 ft at 7:30PM Jun 16, 2021Observed: 1.7 ft at 7:45PM Jun 16, 2021Observed: 1.69 ft at 8:00PM Jun 16, 2021Observed: 1.69 ft at 8:15PM Jun 16, 2021Observed: 1.69 ft at 8:30PM Jun 16, 2021Observed: 1.69 ft at 8:45PM Jun 16, 2021Observed: 1.69 ft at 9:00PM Jun 16, 2021Observed: 1.7 ft at 9:15PM Jun 16, 2021Observed: 1.7 ft at 9:30PM Jun 16, 2021Observed: 1.69 ft at 9:45PM Jun 16, 2021Observed: 1.69 ft at 10:00PM Jun 16, 2021Observed: 1.7 ft at 10:15PM Jun 16, 2021Observed: 1.69 ft at 10:30PM Jun 16, 2021Observed: 1.69 ft at 10:45PM Jun 16, 2021Observed: 1.69 ft at 11:00PM Jun 16, 2021Observed: 1.69 ft at 11:15PM Jun 16, 2021Observed: 1.69 ft at 11:30PM Jun 16, 2021Observed: 1.69 ft at 11:45PM Jun 16, 2021Observed: 1.68 ft at 12:00AM Jun 17, 2021Observed: 1.68 ft at 12:15AM Jun 17, 2021Observed: 1.68 ft at 12:30AM Jun 17, 2021Observed: 1.68 ft at 12:45AM Jun 17, 2021Observed: 1.68 ft at 1:00AM Jun 17, 2021Observed: 1.68 ft at 1:15AM Jun 17, 2021Observed: 1.68 ft at 1:30AM Jun 17, 2021Observed: 1.68 ft at 1:45AM Jun 17, 2021Observed: 1.68 ft at 2:00AM Jun 17, 2021Observed: 1.68 ft at 2:15AM Jun 17, 2021Observed: 1.68 ft at 2:30AM Jun 17, 2021Observed: 1.68 ft at 2:45AM Jun 17, 2021Observed: 1.68 ft at 3:00AM Jun 17, 2021Observed: 1.68 ft at 3:15AM Jun 17, 2021Observed: 1.68 ft at 3:30AM Jun 17, 2021Observed: 1.68 ft at 3:45AM Jun 17, 2021Observed: 1.68 ft at 4:00AM Jun 17, 2021Observed: 1.68 ft at 4:15AM Jun 17, 2021Observed: 1.68 ft at 4:30AM Jun 17, 2021Observed: 1.68 ft at 4:45AM Jun 17, 2021Observed: 1.68 ft at 5:00AM Jun 17, 2021Observed: 1.68 ft at 5:15AM Jun 17, 2021Observed: 1.68 ft at 5:30AM Jun 17, 2021Observed: 1.68 ft at 5:45AM Jun 17, 2021Observed: 1.68 ft at 6:00AM Jun 17, 2021Observed: 1.68 ft at 6:15AM Jun 17, 2021Observed: 1.68 ft at 6:30AM Jun 17, 2021Observed: 1.68 ft at 6:45AM Jun 17, 2021Observed: 1.68 ft at 7:00AM Jun 17, 2021Observed: 1.68 ft at 7:15AM Jun 17, 2021Observed: 1.67 ft at 7:30AM Jun 17, 2021Observed: 1.68 ft at 7:45AM Jun 17, 2021Observed: 1.68 ft at 8:00AM Jun 17, 2021Observed: 1.66 ft at 9:15AM Jun 17, 2021Observed: 1.66 ft at 9:30AM Jun 17, 2021Observed: 1.65 ft at 9:45AM Jun 17, 2021Observed: 1.65 ft at 10:00AM Jun 17, 2021Observed: 1.66 ft at 10:15AM Jun 17, 2021Observed: 1.66 ft at 10:30AM Jun 17, 2021Observed: 1.65 ft at 10:45AM Jun 17, 2021Observed: 1.67 ft at 11:00AM Jun 17, 2021Observed: 1.67 ft at 11:15AM Jun 17, 2021Observed: 1.66 ft at 11:30AM Jun 17, 2021Observed: 1.66 ft at 11:45AM Jun 17, 2021Observed: 1.66 ft at 12:00PM Jun 17, 2021Observed: 1.66 ft at 12:15PM Jun 17, 2021Observed: 1.66 ft at 12:30PM Jun 17, 2021Observed: 1.66 ft at 12:45PM Jun 17, 2021Observed: 1.66 ft at 1:00PM Jun 17, 2021Observed: 1.64 ft at 3:15PM Jun 17, 2021Observed: 1.65 ft at 3:30PM Jun 17, 2021Observed: 1.65 ft at 3:45PM Jun 17, 2021Observed: 1.64 ft at 4:00PM Jun 17, 2021Observed: 1.64 ft at 4:15PM Jun 17, 2021Observed: 1.64 ft at 4:30PM Jun 17, 2021Observed: 1.64 ft at 4:45PM Jun 17, 2021Observed: 1.63 ft at 5:00PM Jun 17, 2021Observed: 1.64 ft at 5:15PM Jun 17, 2021Observed: 1.64 ft at 5:30PM Jun 17, 2021Observed: 1.64 ft at 5:45PM Jun 17, 2021Observed: 1.63 ft at 6:00PM Jun 17, 2021Observed: 1.63 ft at 6:15PM Jun 17, 2021Observed: 1.64 ft at 6:30PM Jun 17, 2021Observed: 1.64 ft at 6:45PM Jun 17, 2021Observed: 1.64 ft at 7:00PM Jun 17, 2021Observed: 1.63 ft at 7:15PM Jun 17, 2021Observed: 1.63 ft at 7:30PM Jun 17, 2021Observed: 1.62 ft at 7:45PM Jun 17, 2021Observed: 1.63 ft at 8:00PM Jun 17, 2021Observed: 1.63 ft at 8:15PM Jun 17, 2021Observed: 1.63 ft at 8:30PM Jun 17, 2021Observed: 1.63 ft at 8:45PM Jun 17, 2021Observed: 1.63 ft at 9:00PM Jun 17, 2021Observed: 1.64 ft at 9:15PM Jun 17, 2021Observed: 1.64 ft at 9:30PM Jun 17, 2021Observed: 1.64 ft at 9:45PM Jun 17, 2021Observed: 1.63 ft at 10:00PM Jun 17, 2021Observed: 1.63 ft at 10:15PM Jun 17, 2021Observed: 1.63 ft at 10:30PM Jun 17, 2021Observed: 1.63 ft at 10:45PM Jun 17, 2021Observed: 1.63 ft at 11:00PM Jun 17, 2021Observed: 1.63 ft at 11:15PM Jun 17, 2021Observed: 1.62 ft at 11:30PM Jun 17, 2021Observed: 1.62 ft at 11:45PM Jun 17, 2021Observed: 1.63 ft at 12:00AM Jun 18, 2021Observed: 1.63 ft at 12:15AM Jun 18, 2021Observed: 1.62 ft at 12:30AM Jun 18, 2021Observed: 1.63 ft at 12:45AM Jun 18, 2021Observed: 1.63 ft at 1:00AM Jun 18, 2021Observed: 1.63 ft at 1:15AM Jun 18, 2021Observed: 1.62 ft at 1:30AM Jun 18, 2021Observed: 1.63 ft at 1:45AM Jun 18, 2021Observed: 1.62 ft at 2:00AM Jun 18, 2021Observed: 1.63 ft at 2:15AM Jun 18, 2021Observed: 1.62 ft at 2:30AM Jun 18, 2021Observed: 1.62 ft at 2:45AM Jun 18, 2021Observed: 1.62 ft at 3:00AM Jun 18, 2021Observed: 1.63 ft at 3:15AM Jun 18, 2021Observed: 1.63 ft at 3:30AM Jun 18, 2021Observed: 1.63 ft at 3:45AM Jun 18, 2021Observed: 1.63 ft at 4:00AM Jun 18, 2021Observed: 1.63 ft at 4:15AM Jun 18, 2021Observed: 1.63 ft at 4:30AM Jun 18, 2021Observed: 1.63 ft at 4:45AM Jun 18, 2021Observed: 1.63 ft at 5:00AM Jun 18, 2021Observed: 1.63 ft at 5:15AM Jun 18, 2021Observed: 1.63 ft at 5:30AM Jun 18, 2021Observed: 1.63 ft at 5:45AM Jun 18, 2021Observed: 1.63 ft at 6:00AM Jun 18, 2021Observed: 1.63 ft at 6:15AM Jun 18, 2021Observed: 1.63 ft at 6:30AM Jun 18, 2021Observed: 1.63 ft at 6:45AM Jun 18, 2021Observed: 1.62 ft at 7:00AM Jun 18, 2021Observed: 1.62 ft at 7:15AM Jun 18, 2021Observed: 1.63 ft at 7:30AM Jun 18, 2021Observed: 1.62 ft at 7:45AM Jun 18, 2021Observed: 1.63 ft at 8:00AM Jun 18, 2021Observed: 1.63 ft at 8:15AM Jun 18, 2021Observed: 1.63 ft at 8:30AM Jun 18, 2021Observed: 1.61 ft at 8:45AM Jun 18, 2021Observed: 1.61 ft at 9:00AM Jun 18, 2021Observed: 1.61 ft at 9:15AM Jun 18, 2021Observed: 1.61 ft at 9:30AM Jun 18, 2021Observed: 1.61 ft at 9:45AM Jun 18, 2021Observed: 1.6 ft at 10:00AM Jun 18, 2021Observed: 1.61 ft at 10:15AM Jun 18, 2021Observed: 1.61 ft at 10:30AM Jun 18, 2021Observed: 1.62 ft at 10:45AM Jun 18, 2021Observed: 1.61 ft at 11:00AM Jun 18, 2021Observed: 1.61 ft at 11:15AM Jun 18, 2021Observed: 1.61 ft at 11:30AM Jun 18, 2021Observed: 1.61 ft at 11:45AM Jun 18, 2021Observed: 1.61 ft at 12:00PM Jun 18, 2021Observed: 1.62 ft at 12:15PM Jun 18, 2021Observed: 1.62 ft at 12:30PM Jun 18, 2021Observed: 1.61 ft at 12:45PM Jun 18, 2021Observed: 1.61 ft at 1:00PM Jun 18, 2021Observed: 1.61 ft at 1:15PM Jun 18, 2021Observed: 1.61 ft at 1:30PM Jun 18, 2021Observed: 1.6 ft at 1:45PM Jun 18, 2021Observed: 1.6 ft at 2:00PM Jun 18, 2021Observed: 1.6 ft at 2:15PM Jun 18, 2021Observed: 1.6 ft at 2:30PM Jun 18, 2021Observed: 1.6 ft at 2:45PM Jun 18, 2021Observed: 1.6 ft at 3:00PM Jun 18, 2021Observed: 1.6 ft at 3:15PM Jun 18, 2021Observed: 1.61 ft at 3:30PM Jun 18, 2021Observed: 1.6 ft at 3:45PM Jun 18, 2021Observed: 1.6 ft at 4:00PM Jun 18, 2021Observed: 1.6 ft at 4:15PM Jun 18, 2021Observed: 1.6 ft at 4:30PM Jun 18, 2021Observed: 1.6 ft at 4:45PM Jun 18, 2021Observed: 1.6 ft at 5:00PM Jun 18, 2021Observed: 1.6 ft at 5:15PM Jun 18, 2021Observed: 1.6 ft at 5:30PM Jun 18, 2021Observed: 1.6 ft at 5:45PM Jun 18, 2021Observed: 1.6 ft at 6:00PM Jun 18, 2021Observed: 1.59 ft at 6:15PM Jun 18, 2021Observed: 1.59 ft at 6:30PM Jun 18, 2021Observed: 1.59 ft at 6:45PM Jun 18, 2021Observed: 1.59 ft at 7:00PM Jun 18, 2021Observed: 1.59 ft at 7:15PM Jun 18, 2021Observed: 1.6 ft at 7:30PM Jun 18, 2021Observed: 1.6 ft at 7:45PM Jun 18, 2021Observed: 1.6 ft at 8:00PM Jun 18, 2021Observed: 1.6 ft at 8:15PM Jun 18, 2021Observed: 1.6 ft at 8:30PM Jun 18, 2021Observed: 1.6 ft at 8:45PM Jun 18, 2021Observed: 1.6 ft at 9:00PM Jun 18, 2021Observed: 1.59 ft at 9:15PM Jun 18, 2021Observed: 1.59 ft at 9:30PM Jun 18, 2021Observed: 1.59 ft at 9:45PM Jun 18, 2021Observed: 1.59 ft at 10:00PM Jun 18, 2021Observed: 1.59 ft at 10:15PM Jun 18, 2021Observed: 1.59 ft at 10:30PM Jun 18, 2021Observed: 1.59 ft at 10:45PM Jun 18, 2021Observed: 1.59 ft at 11:00PM Jun 18, 2021Observed: 1.59 ft at 11:15PM Jun 18, 2021Observed: 1.59 ft at 11:30PM Jun 18, 2021Observed: 1.59 ft at 11:45PM Jun 18, 2021Observed: 1.59 ft at 12:00AM Jun 19, 2021Observed: 1.59 ft at 12:15AM Jun 19, 2021Observed: 1.59 ft at 12:30AM Jun 19, 2021Observed: 1.59 ft at 12:45AM Jun 19, 2021Observed: 1.59 ft at 1:00AM Jun 19, 2021Observed: 1.59 ft at 1:15AM Jun 19, 2021Observed: 1.59 ft at 1:30AM Jun 19, 2021Observed: 1.59 ft at 1:45AM Jun 19, 2021Observed: 1.6 ft at 2:00AM Jun 19, 2021Observed: 1.59 ft at 2:15AM Jun 19, 2021Observed: 1.59 ft at 2:30AM Jun 19, 2021Observed: 1.59 ft at 2:45AM Jun 19, 2021Observed: 1.59 ft at 3:00AM Jun 19, 2021Observed: 1.59 ft at 3:15AM Jun 19, 2021Observed: 1.59 ft at 3:30AM Jun 19, 2021Observed: 1.59 ft at 3:45AM Jun 19, 2021Observed: 1.59 ft at 4:00AM Jun 19, 2021Observed: 1.59 ft at 4:15AM Jun 19, 2021Observed: 1.59 ft at 4:30AM Jun 19, 2021Observed: 1.59 ft at 4:45AM Jun 19, 2021Observed: 1.59 ft at 5:00AM Jun 19, 2021Observed: 1.59 ft at 5:15AM Jun 19, 2021Observed: 1.59 ft at 5:30AM Jun 19, 2021Observed: 1.59 ft at 5:45AM Jun 19, 2021Observed: 1.59 ft at 6:00AM Jun 19, 2021Observed: 1.59 ft at 6:15AM Jun 19, 2021Observed: 1.59 ft at 6:30AM Jun 19, 2021Observed: 1.59 ft at 6:45AM Jun 19, 2021Observed: 1.59 ft at 7:00AM Jun 19, 2021Observed: 1.59 ft at 7:15AM Jun 19, 2021Observed: 1.59 ft at 7:30AM Jun 19, 2021Observed: 1.6 ft at 7:45AM Jun 19, 2021Observed: 1.6 ft at 8:00AM Jun 19, 2021Observed: 1.6 ft at 8:15AM Jun 19, 2021Observed: 1.6 ft at 8:30AM Jun 19, 2021Observed: 1.6 ft at 8:45AM Jun 19, 2021Observed: 1.6 ft at 9:00AM Jun 19, 2021Observed: 1.59 ft at 9:15AM Jun 19, 2021Observed: 1.59 ft at 9:30AM Jun 19, 2021Observed: 1.59 ft at 9:45AM Jun 19, 2021Observed: 1.6 ft at 10:00AM Jun 19, 2021Observed: 1.59 ft at 10:15AM Jun 19, 2021Observed: 1.59 ft at 10:30AM Jun 19, 2021Observed: 1.6 ft at 10:45AM Jun 19, 2021Observed: 1.6 ft at 11:00AM Jun 19, 2021Observed: 1.6 ft at 11:15AM Jun 19, 2021Observed: 1.6 ft at 11:30AM Jun 19, 2021Observed: 1.6 ft at 11:45AM Jun 19, 2021Observed: 1.6 ft at 12:00PM Jun 19, 2021Observed: 1.59 ft at 12:15PM Jun 19, 2021Observed: 1.59 ft at 12:30PM Jun 19, 2021Observed: 1.59 ft at 12:45PM Jun 19, 2021Observed: 1.59 ft at 1:00PM Jun 19, 2021Observed: 1.59 ft at 1:15PM Jun 19, 2021Observed: 1.59 ft at 1:30PM Jun 19, 2021Observed: 1.58 ft at 1:45PM Jun 19, 2021Observed: 1.59 ft at 2:00PM Jun 19, 2021Observed: 1.59 ft at 2:15PM Jun 19, 2021Observed: 1.59 ft at 2:30PM Jun 19, 2021Observed: 1.59 ft at 2:45PM Jun 19, 2021Observed: 1.58 ft at 3:00PM Jun 19, 2021Observed: 1.58 ft at 3:15PM Jun 19, 2021Observed: 1.59 ft at 3:30PM Jun 19, 2021Observed: 1.58 ft at 3:45PM Jun 19, 2021Observed: 1.58 ft at 4:00PM Jun 19, 2021USGS--Water Resources of the United StatesGMRM2(plotting HGIRG) Graph Created (5:25PM Jun 19, 2021)ObservedLatest observed value: 1.58 ft at 4:00 PM EDT 19-Jun-2021. 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) 11.57 ft on 08/04/2020
(2) 7.45 ft on 07/08/2019 (P)
(3) 6.00 ft on 11/25/2018
(4) 6.19 ft on 07/22/2018
(5) 7.90 ft on 05/20/2018
Show More Recent Crests

(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.
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
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.
About This Location Collapse

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:
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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