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Hydrograph River at a Glance Download
St. Marys River at Great Mills Stage (ft)Flow (cfs)Highest Observation: 1.69 ft at 3:00AM Feb 17, 2020Highest Observation: 1.69 ft at 3:15AM Feb 17, 2020Highest Observation: 1.69 ft at 3:30AM Feb 17, 2020Highest Observation: 1.69 ft at 3:45AM Feb 17, 2020Highest Observation: 1.69 ft at 4:00AM Feb 17, 2020Highest Observation: 1.69 ft at 4:15AM Feb 17, 2020Highest Observation: 1.69 ft at 4:30AM Feb 17, 2020Highest Observation: 1.69 ft at 4:45AM Feb 17, 2020Highest Observation: 1.69 ft at 5:00AM Feb 17, 2020Highest Observation: 1.69 ft at 5:15AM Feb 17, 2020Highest Observation: 1.69 ft at 5:30AM Feb 17, 2020Highest Observation: 1.69 ft at 5:45AM Feb 17, 2020Highest Observation: 1.69 ft at 6:00AM Feb 17, 2020Highest Observation: 1.69 ft at 6:15AM Feb 17, 2020Highest Observation: 1.69 ft at 6:30AM Feb 17, 2020Highest Observation: 1.69 ft at 6:45AM Feb 17, 2020Highest Observation: 1.69 ft at 7:00AM Feb 17, 2020Highest Observation: 1.69 ft at 7:15AM Feb 17, 2020Highest Observation: 1.69 ft at 7:30AM Feb 17, 2020Highest Observation: 1.69 ft at 7:45AM Feb 17, 2020Observed: 1.68 ft at 8:00AM Feb 17, 2020Observed: 1.68 ft at 8:15AM Feb 17, 2020Observed: 1.68 ft at 8:30AM Feb 17, 2020Observed: 1.68 ft at 8:45AM Feb 17, 2020Observed: 1.68 ft at 9:00AM Feb 17, 2020Observed: 1.68 ft at 9:15AM Feb 17, 2020Observed: 1.67 ft at 9:30AM Feb 17, 2020Observed: 1.67 ft at 9:45AM Feb 17, 2020Observed: 1.68 ft at 10:00AM Feb 17, 2020Highest Observation: 1.69 ft at 10:15AM Feb 17, 2020Observed: 1.68 ft at 10:30AM Feb 17, 2020Observed: 1.68 ft at 10:45AM Feb 17, 2020Observed: 1.67 ft at 11:00AM Feb 17, 2020Observed: 1.67 ft at 11:15AM Feb 17, 2020Observed: 1.68 ft at 11:30AM Feb 17, 2020Observed: 1.68 ft at 11:45AM Feb 17, 2020Observed: 1.68 ft at 12:00PM Feb 17, 2020Observed: 1.68 ft at 12:15PM Feb 17, 2020Observed: 1.68 ft at 12:30PM Feb 17, 2020Observed: 1.67 ft at 12:45PM Feb 17, 2020Observed: 1.67 ft at 1:00PM Feb 17, 2020Observed: 1.67 ft at 1:15PM Feb 17, 2020Observed: 1.67 ft at 1:30PM Feb 17, 2020Observed: 1.68 ft at 1:45PM Feb 17, 2020Observed: 1.68 ft at 2:00PM Feb 17, 2020Highest Observation: 1.69 ft at 2:15PM Feb 17, 2020Observed: 1.68 ft at 2:30PM Feb 17, 2020Observed: 1.68 ft at 2:45PM Feb 17, 2020Observed: 1.68 ft at 3:00PM Feb 17, 2020Observed: 1.68 ft at 3:15PM Feb 17, 2020Observed: 1.68 ft at 3:30PM Feb 17, 2020Observed: 1.67 ft at 3:45PM Feb 17, 2020Observed: 1.67 ft at 4:00PM Feb 17, 2020Observed: 1.67 ft at 4:15PM Feb 17, 2020Observed: 1.67 ft at 4:30PM Feb 17, 2020Observed: 1.67 ft at 4:45PM Feb 17, 2020Observed: 1.67 ft at 5:00PM Feb 17, 2020Observed: 1.67 ft at 5:15PM Feb 17, 2020Observed: 1.67 ft at 5:30PM Feb 17, 2020Observed: 1.67 ft at 5:45PM Feb 17, 2020Observed: 1.66 ft at 6:00PM Feb 17, 2020Observed: 1.67 ft at 6:15PM Feb 17, 2020Observed: 1.67 ft at 6:30PM Feb 17, 2020Observed: 1.67 ft at 6:45PM Feb 17, 2020Observed: 1.66 ft at 7:00PM Feb 17, 2020Observed: 1.66 ft at 7:15PM Feb 17, 2020Observed: 1.66 ft at 7:30PM Feb 17, 2020Observed: 1.66 ft at 7:45PM Feb 17, 2020Observed: 1.66 ft at 8:00PM Feb 17, 2020Observed: 1.66 ft at 8:15PM Feb 17, 2020Observed: 1.66 ft at 8:30PM Feb 17, 2020Observed: 1.67 ft at 8:45PM Feb 17, 2020Observed: 1.66 ft at 9:00PM Feb 17, 2020Observed: 1.67 ft at 9:15PM Feb 17, 2020Observed: 1.67 ft at 9:30PM Feb 17, 2020Observed: 1.67 ft at 9:45PM Feb 17, 2020Observed: 1.67 ft at 10:00PM Feb 17, 2020Observed: 1.67 ft at 10:15PM Feb 17, 2020Observed: 1.66 ft at 10:30PM Feb 17, 2020Observed: 1.67 ft at 10:45PM Feb 17, 2020Observed: 1.66 ft at 11:00PM Feb 17, 2020Observed: 1.67 ft at 11:15PM Feb 17, 2020Observed: 1.66 ft at 11:30PM Feb 17, 2020Observed: 1.66 ft at 11:45PM Feb 17, 2020Observed: 1.66 ft at 12:00AM Feb 18, 2020Observed: 1.66 ft at 12:15AM Feb 18, 2020Observed: 1.66 ft at 12:30AM Feb 18, 2020Observed: 1.66 ft at 12:45AM Feb 18, 2020Observed: 1.66 ft at 1:00AM Feb 18, 2020Observed: 1.66 ft at 1:15AM Feb 18, 2020Observed: 1.66 ft at 1:30AM Feb 18, 2020Observed: 1.66 ft at 1:45AM Feb 18, 2020Observed: 1.66 ft at 2:00AM Feb 18, 2020Observed: 1.66 ft at 2:15AM Feb 18, 2020Observed: 1.66 ft at 2:30AM Feb 18, 2020Observed: 1.66 ft at 2:45AM Feb 18, 2020Observed: 1.66 ft at 3:00AM Feb 18, 2020Observed: 1.66 ft at 3:15AM Feb 18, 2020Observed: 1.66 ft at 3:30AM Feb 18, 2020Observed: 1.66 ft at 3:45AM Feb 18, 2020Observed: 1.66 ft at 4:00AM Feb 18, 2020Observed: 1.66 ft at 4:15AM Feb 18, 2020Observed: 1.66 ft at 4:30AM Feb 18, 2020Observed: 1.66 ft at 4:45AM Feb 18, 2020Observed: 1.66 ft at 5:00AM Feb 18, 2020Observed: 1.66 ft at 5:15AM Feb 18, 2020Observed: 1.66 ft at 5:30AM Feb 18, 2020Observed: 1.66 ft at 5:45AM Feb 18, 2020Observed: 1.66 ft at 6:00AM Feb 18, 2020Observed: 1.66 ft at 6:15AM Feb 18, 2020Observed: 1.66 ft at 6:30AM Feb 18, 2020Observed: 1.66 ft at 6:45AM Feb 18, 2020Observed: 1.66 ft at 7:00AM Feb 18, 2020Observed: 1.66 ft at 7:15AM Feb 18, 2020Observed: 1.66 ft at 7:30AM Feb 18, 2020Observed: 1.65 ft at 7:45AM Feb 18, 2020Observed: 1.65 ft at 8:00AM Feb 18, 2020Observed: 1.65 ft at 8:15AM Feb 18, 2020Observed: 1.65 ft at 8:30AM Feb 18, 2020Observed: 1.65 ft at 8:45AM Feb 18, 2020Observed: 1.65 ft at 9:00AM Feb 18, 2020Observed: 1.65 ft at 9:15AM Feb 18, 2020Observed: 1.65 ft at 9:30AM Feb 18, 2020Observed: 1.65 ft at 9:45AM Feb 18, 2020Observed: 1.65 ft at 10:00AM Feb 18, 2020Observed: 1.65 ft at 10:15AM Feb 18, 2020Observed: 1.65 ft at 10:30AM Feb 18, 2020Observed: 1.65 ft at 10:45AM Feb 18, 2020Observed: 1.65 ft at 11:00AM Feb 18, 2020Observed: 1.65 ft at 11:15AM Feb 18, 2020Observed: 1.65 ft at 11:30AM Feb 18, 2020Observed: 1.65 ft at 11:45AM Feb 18, 2020Observed: 1.65 ft at 12:00PM Feb 18, 2020Observed: 1.65 ft at 12:15PM Feb 18, 2020Observed: 1.65 ft at 12:30PM Feb 18, 2020Observed: 1.65 ft at 12:45PM Feb 18, 2020Observed: 1.65 ft at 1:00PM Feb 18, 2020Observed: 1.64 ft at 1:15PM Feb 18, 2020Observed: 1.66 ft at 1:30PM Feb 18, 2020Observed: 1.65 ft at 1:45PM Feb 18, 2020Observed: 1.65 ft at 2:00PM Feb 18, 2020Observed: 1.65 ft at 2:15PM Feb 18, 2020Observed: 1.65 ft at 2:30PM Feb 18, 2020Observed: 1.65 ft at 2:45PM Feb 18, 2020Observed: 1.65 ft at 3:00PM Feb 18, 2020Observed: 1.65 ft at 3:15PM Feb 18, 2020Observed: 1.65 ft at 3:30PM Feb 18, 2020Observed: 1.65 ft at 3:45PM Feb 18, 2020Observed: 1.65 ft at 4:00PM Feb 18, 2020Observed: 1.65 ft at 4:15PM Feb 18, 2020Observed: 1.65 ft at 4:30PM Feb 18, 2020Observed: 1.65 ft at 4:45PM Feb 18, 2020Observed: 1.65 ft at 5:00PM Feb 18, 2020Observed: 1.65 ft at 5:15PM Feb 18, 2020Observed: 1.65 ft at 5:30PM Feb 18, 2020Observed: 1.65 ft at 5:45PM Feb 18, 2020Observed: 1.65 ft at 6:00PM Feb 18, 2020Observed: 1.65 ft at 6:15PM Feb 18, 2020Observed: 1.65 ft at 6:30PM Feb 18, 2020Observed: 1.65 ft at 6:45PM Feb 18, 2020Observed: 1.65 ft at 7:00PM Feb 18, 2020Observed: 1.65 ft at 7:15PM Feb 18, 2020Observed: 1.65 ft at 7:30PM Feb 18, 2020Observed: 1.65 ft at 7:45PM Feb 18, 2020Observed: 1.65 ft at 8:00PM Feb 18, 2020Observed: 1.65 ft at 8:15PM Feb 18, 2020Observed: 1.64 ft at 8:30PM Feb 18, 2020Observed: 1.64 ft at 8:45PM Feb 18, 2020Observed: 1.64 ft at 9:00PM Feb 18, 2020Observed: 1.64 ft at 9:15PM Feb 18, 2020Observed: 1.64 ft at 9:30PM Feb 18, 2020Observed: 1.64 ft at 9:45PM Feb 18, 2020Observed: 1.64 ft at 10:00PM Feb 18, 2020Observed: 1.64 ft at 10:15PM Feb 18, 2020Observed: 1.64 ft at 10:30PM Feb 18, 2020Observed: 1.64 ft at 10:45PM Feb 18, 2020Observed: 1.64 ft at 11:00PM Feb 18, 2020Observed: 1.64 ft at 11:15PM Feb 18, 2020Observed: 1.64 ft at 11:30PM Feb 18, 2020Observed: 1.64 ft at 11:45PM Feb 18, 2020Observed: 1.64 ft at 12:00AM Feb 19, 2020Observed: 1.64 ft at 12:15AM Feb 19, 2020Observed: 1.64 ft at 12:30AM Feb 19, 2020Observed: 1.64 ft at 12:45AM Feb 19, 2020Observed: 1.64 ft at 1:00AM Feb 19, 2020Observed: 1.64 ft at 1:15AM Feb 19, 2020Observed: 1.64 ft at 1:30AM Feb 19, 2020Observed: 1.64 ft at 1:45AM Feb 19, 2020Observed: 1.64 ft at 2:00AM Feb 19, 2020Observed: 1.64 ft at 2:15AM Feb 19, 2020Observed: 1.64 ft at 2:30AM Feb 19, 2020Observed: 1.64 ft at 2:45AM Feb 19, 2020Observed: 1.64 ft at 3:00AM Feb 19, 2020Observed: 1.64 ft at 3:15AM Feb 19, 2020Observed: 1.64 ft at 3:30AM Feb 19, 2020Observed: 1.64 ft at 3:45AM Feb 19, 2020Observed: 1.64 ft at 4:00AM Feb 19, 2020Observed: 1.64 ft at 4:15AM Feb 19, 2020Observed: 1.64 ft at 4:30AM Feb 19, 2020Observed: 1.64 ft at 4:45AM Feb 19, 2020Observed: 1.64 ft at 5:00AM Feb 19, 2020Observed: 1.64 ft at 5:15AM Feb 19, 2020Observed: 1.64 ft at 5:30AM Feb 19, 2020Observed: 1.64 ft at 5:45AM Feb 19, 2020Observed: 1.64 ft at 6:00AM Feb 19, 2020Observed: 1.64 ft at 6:15AM Feb 19, 2020Observed: 1.64 ft at 6:30AM Feb 19, 2020Observed: 1.64 ft at 6:45AM Feb 19, 2020Observed: 1.64 ft at 7:00AM Feb 19, 2020Observed: 1.64 ft at 7:15AM Feb 19, 2020Observed: 1.64 ft at 7:30AM Feb 19, 2020Observed: 1.64 ft at 7:45AM Feb 19, 2020Observed: 1.64 ft at 8:00AM Feb 19, 2020Observed: 1.64 ft at 8:15AM Feb 19, 2020Observed: 1.64 ft at 8:30AM Feb 19, 2020Observed: 1.64 ft at 8:45AM Feb 19, 2020Observed: 1.64 ft at 9:00AM Feb 19, 2020Observed: 1.64 ft at 9:15AM Feb 19, 2020Observed: 1.64 ft at 9:30AM Feb 19, 2020Observed: 1.64 ft at 9:45AM Feb 19, 2020Observed: 1.64 ft at 10:00AM Feb 19, 2020Observed: 1.63 ft at 10:15AM Feb 19, 2020Observed: 1.63 ft at 10:30AM Feb 19, 2020Observed: 1.63 ft at 10:45AM Feb 19, 2020Observed: 1.64 ft at 11:00AM Feb 19, 2020Observed: 1.64 ft at 11:15AM Feb 19, 2020Observed: 1.63 ft at 11:30AM Feb 19, 2020Observed: 1.63 ft at 11:45AM Feb 19, 2020Observed: 1.63 ft at 12:00PM Feb 19, 2020Observed: 1.63 ft at 12:15PM Feb 19, 2020Observed: 1.63 ft at 12:30PM Feb 19, 2020Observed: 1.63 ft at 12:45PM Feb 19, 2020Observed: 1.63 ft at 1:00PM Feb 19, 2020Observed: 1.63 ft at 1:15PM Feb 19, 2020Observed: 1.63 ft at 1:30PM Feb 19, 2020Observed: 1.63 ft at 1:45PM Feb 19, 2020Observed: 1.63 ft at 2:00PM Feb 19, 2020Observed: 1.63 ft at 2:15PM Feb 19, 2020Observed: 1.63 ft at 2:30PM Feb 19, 2020Observed: 1.63 ft at 2:45PM Feb 19, 2020Observed: 1.63 ft at 3:00PM Feb 19, 2020Observed: 1.63 ft at 3:15PM Feb 19, 2020Observed: 1.63 ft at 3:30PM Feb 19, 2020Observed: 1.63 ft at 3:45PM Feb 19, 2020Observed: 1.63 ft at 4:00PM Feb 19, 2020Observed: 1.62 ft at 4:15PM Feb 19, 2020Observed: 1.62 ft at 4:30PM Feb 19, 2020Observed: 1.63 ft at 4:45PM Feb 19, 2020Observed: 1.63 ft at 5:00PM Feb 19, 2020Observed: 1.62 ft at 5:15PM Feb 19, 2020Observed: 1.62 ft at 5:30PM Feb 19, 2020Observed: 1.62 ft at 5:45PM Feb 19, 2020Observed: 1.62 ft at 6:00PM Feb 19, 2020Observed: 1.62 ft at 6:15PM Feb 19, 2020Observed: 1.62 ft at 6:30PM Feb 19, 2020Observed: 1.61 ft at 6:45PM Feb 19, 2020Observed: 1.62 ft at 7:00PM Feb 19, 2020Observed: 1.62 ft at 7:15PM Feb 19, 2020Observed: 1.62 ft at 7:30PM Feb 19, 2020Observed: 1.62 ft at 7:45PM Feb 19, 2020Observed: 1.62 ft at 8:00PM Feb 19, 2020Observed: 1.62 ft at 8:15PM Feb 19, 2020Observed: 1.62 ft at 8:30PM Feb 19, 2020Observed: 1.62 ft at 8:45PM Feb 19, 2020Observed: 1.62 ft at 9:00PM Feb 19, 2020Observed: 1.62 ft at 9:15PM Feb 19, 2020Observed: 1.62 ft at 9:30PM Feb 19, 2020Observed: 1.62 ft at 9:45PM Feb 19, 2020Observed: 1.62 ft at 10:00PM Feb 19, 2020Observed: 1.62 ft at 10:15PM Feb 19, 2020Observed: 1.62 ft at 10:30PM Feb 19, 2020Observed: 1.62 ft at 10:45PM Feb 19, 2020Observed: 1.62 ft at 11:00PM Feb 19, 2020Observed: 1.62 ft at 11:15PM Feb 19, 2020Observed: 1.62 ft at 11:30PM Feb 19, 2020Observed: 1.62 ft at 11:45PM Feb 19, 2020Observed: 1.62 ft at 12:00AM Feb 20, 2020Observed: 1.62 ft at 12:15AM Feb 20, 2020Observed: 1.62 ft at 12:30AM Feb 20, 2020Observed: 1.62 ft at 12:45AM Feb 20, 2020Observed: 1.62 ft at 1:00AM Feb 20, 2020Observed: 1.62 ft at 1:15AM Feb 20, 2020Observed: 1.62 ft at 1:30AM Feb 20, 2020Observed: 1.61 ft at 1:45AM Feb 20, 2020Observed: 1.61 ft at 2:00AM Feb 20, 2020Observed: 1.61 ft at 2:15AM Feb 20, 2020Observed: 1.61 ft at 2:30AM Feb 20, 2020Observed: 1.61 ft at 2:45AM Feb 20, 2020Observed: 1.61 ft at 3:00AM Feb 20, 2020Observed: 1.61 ft at 3:15AM Feb 20, 2020Observed: 1.61 ft at 3:30AM Feb 20, 2020Observed: 1.61 ft at 3:45AM Feb 20, 2020Observed: 1.61 ft at 4:00AM Feb 20, 2020Observed: 1.61 ft at 4:15AM Feb 20, 2020Observed: 1.61 ft at 4:30AM Feb 20, 2020Observed: 1.61 ft at 4:45AM Feb 20, 2020Observed: 1.62 ft at 5:00AM Feb 20, 2020Observed: 1.61 ft at 5:15AM Feb 20, 2020Observed: 1.61 ft at 5:30AM Feb 20, 2020Observed: 1.61 ft at 5:45AM Feb 20, 2020Observed: 1.61 ft at 6:00AM Feb 20, 2020Observed: 1.61 ft at 6:15AM Feb 20, 2020Observed: 1.61 ft at 6:30AM Feb 20, 2020Observed: 1.61 ft at 6:45AM Feb 20, 2020Observed: 1.61 ft at 7:00AM Feb 20, 2020Observed: 1.61 ft at 7:15AM Feb 20, 2020Observed: 1.61 ft at 7:30AM Feb 20, 2020Observed: 1.61 ft at 7:45AM Feb 20, 2020Observed: 1.61 ft at 8:00AM Feb 20, 2020Observed: 1.61 ft at 8:15AM Feb 20, 2020Observed: 1.61 ft at 8:30AM Feb 20, 2020Observed: 1.6 ft at 8:45AM Feb 20, 2020Observed: 1.6 ft at 9:00AM Feb 20, 2020Observed: 1.6 ft at 9:15AM Feb 20, 2020Observed: 1.6 ft at 9:30AM Feb 20, 2020Observed: 1.6 ft at 9:45AM Feb 20, 2020Observed: 1.6 ft at 10:00AM Feb 20, 2020Observed: 1.6 ft at 10:15AM Feb 20, 2020Observed: 1.6 ft at 10:30AM Feb 20, 2020Observed: 1.6 ft at 10:45AM Feb 20, 2020Observed: 1.6 ft at 11:00AM Feb 20, 2020Observed: 1.6 ft at 11:15AM Feb 20, 2020Observed: 1.6 ft at 11:30AM Feb 20, 2020Observed: 1.6 ft at 11:45AM Feb 20, 2020Observed: 1.6 ft at 12:00PM Feb 20, 2020Observed: 1.6 ft at 12:15PM Feb 20, 2020Observed: 1.6 ft at 12:30PM Feb 20, 2020Observed: 1.6 ft at 12:45PM Feb 20, 2020Observed: 1.6 ft at 1:00PM Feb 20, 2020Observed: 1.6 ft at 1:15PM Feb 20, 2020Observed: 1.6 ft at 1:30PM Feb 20, 2020Observed: 1.6 ft at 1:45PM Feb 20, 2020Observed: 1.6 ft at 2:00PM Feb 20, 2020Observed: 1.6 ft at 2:15PM Feb 20, 2020Observed: 1.6 ft at 2:30PM Feb 20, 2020Observed: 1.6 ft at 2:45PM Feb 20, 2020Observed: 1.6 ft at 3:00PM Feb 20, 2020Observed: 1.6 ft at 3:15PM Feb 20, 2020Observed: 1.6 ft at 3:30PM Feb 20, 2020Observed: 1.6 ft at 3:45PM Feb 20, 2020Observed: 1.6 ft at 4:00PM Feb 20, 2020Observed: 1.6 ft at 4:15PM Feb 20, 2020Observed: 1.6 ft at 4:30PM Feb 20, 2020Observed: 1.6 ft at 4:45PM Feb 20, 2020Observed: 1.6 ft at 5:00PM Feb 20, 2020Observed: 1.6 ft at 5:15PM Feb 20, 2020Observed: 1.6 ft at 5:30PM Feb 20, 2020Observed: 1.6 ft at 5:45PM Feb 20, 2020Observed: 1.6 ft at 6:00PM Feb 20, 2020Observed: 1.6 ft at 6:15PM Feb 20, 2020Observed: 1.6 ft at 6:30PM Feb 20, 2020Observed: 1.6 ft at 6:45PM Feb 20, 2020Observed: 1.6 ft at 7:00PM Feb 20, 2020Observed: 1.6 ft at 7:15PM Feb 20, 2020Observed: 1.6 ft at 7:30PM Feb 20, 2020Observed: 1.6 ft at 7:45PM Feb 20, 2020Observed: 1.6 ft at 8:00PM Feb 20, 2020Observed: 1.6 ft at 8:15PM Feb 20, 2020Observed: 1.6 ft at 8:30PM Feb 20, 2020Observed: 1.6 ft at 8:45PM Feb 20, 2020Observed: 1.6 ft at 9:00PM Feb 20, 2020Observed: 1.6 ft at 9:15PM Feb 20, 2020Observed: 1.6 ft at 9:30PM Feb 20, 2020Observed: 1.6 ft at 9:45PM Feb 20, 2020Observed: 1.6 ft at 10:00PM Feb 20, 2020Observed: 1.6 ft at 10:15PM Feb 20, 2020Observed: 1.6 ft at 10:30PM Feb 20, 2020Observed: 1.6 ft at 10:45PM Feb 20, 2020Observed: 1.61 ft at 11:00PM Feb 20, 2020Observed: 1.6 ft at 11:15PM Feb 20, 2020Observed: 1.6 ft at 11:30PM Feb 20, 2020Observed: 1.6 ft at 11:45PM Feb 20, 2020Observed: 1.6 ft at 12:00AM Feb 21, 2020Observed: 1.6 ft at 12:15AM Feb 21, 2020Observed: 1.6 ft at 12:30AM Feb 21, 2020Observed: 1.6 ft at 12:45AM Feb 21, 2020Observed: 1.6 ft at 1:00AM Feb 21, 2020Observed: 1.6 ft at 1:15AM Feb 21, 2020Observed: 1.6 ft at 1:30AM Feb 21, 2020Observed: 1.6 ft at 1:45AM Feb 21, 2020Observed: 1.6 ft at 2:00AM Feb 21, 2020Observed: 1.6 ft at 2:15AM Feb 21, 2020Observed: 1.6 ft at 2:30AM Feb 21, 2020Observed: 1.6 ft at 2:45AM Feb 21, 2020Observed: 1.6 ft at 3:00AM Feb 21, 2020Observed: 1.6 ft at 3:15AM Feb 21, 2020Observed: 1.59 ft at 3:30AM Feb 21, 2020Observed: 1.59 ft at 3:45AM Feb 21, 2020Observed: 1.59 ft at 4:00AM Feb 21, 2020Observed: 1.59 ft at 4:15AM Feb 21, 2020Observed: 1.6 ft at 4:30AM Feb 21, 2020Observed: 1.59 ft at 4:45AM Feb 21, 2020Observed: 1.6 ft at 5:00AM Feb 21, 2020Observed: 1.6 ft at 5:15AM Feb 21, 2020Observed: 1.6 ft at 5:30AM Feb 21, 2020Observed: 1.6 ft at 5:45AM Feb 21, 2020Observed: 1.6 ft at 6:00AM Feb 21, 2020Observed: 1.6 ft at 6:15AM Feb 21, 2020Observed: 1.6 ft at 6:30AM Feb 21, 2020Observed: 1.6 ft at 6:45AM Feb 21, 2020Observed: 1.58 ft at 7:00AM Feb 21, 2020Observed: 1.59 ft at 7:15AM Feb 21, 2020Observed: 1.59 ft at 7:30AM Feb 21, 2020Observed: 1.6 ft at 7:45AM Feb 21, 2020Observed: 1.6 ft at 8:00AM Feb 21, 2020Observed: 1.6 ft at 8:15AM Feb 21, 2020Observed: 1.59 ft at 8:30AM Feb 21, 2020Observed: 1.59 ft at 8:45AM Feb 21, 2020Observed: 1.59 ft at 9:00AM Feb 21, 2020Observed: 1.59 ft at 9:15AM Feb 21, 2020Observed: 1.59 ft at 9:30AM Feb 21, 2020Observed: 1.59 ft at 9:45AM Feb 21, 2020Observed: 1.59 ft at 10:00AM Feb 21, 2020Observed: 1.59 ft at 10:15AM Feb 21, 2020Observed: 1.56 ft at 10:30AM Feb 21, 2020Observed: 1.56 ft at 10:45AM Feb 21, 2020Observed: 1.57 ft at 11:00AM Feb 21, 2020Observed: 1.58 ft at 11:15AM Feb 21, 2020Observed: 1.58 ft at 11:30AM Feb 21, 2020Observed: 1.56 ft at 11:45AM Feb 21, 2020Observed: 1.58 ft at 12:00PM Feb 21, 2020Observed: 1.58 ft at 12:15PM Feb 21, 2020Observed: 1.58 ft at 12:30PM Feb 21, 2020Observed: 1.57 ft at 12:45PM Feb 21, 2020Observed: 1.57 ft at 1:00PM Feb 21, 2020Observed: 1.57 ft at 1:15PM Feb 21, 2020Observed: 1.58 ft at 1:30PM Feb 21, 2020Observed: 1.58 ft at 1:45PM Feb 21, 2020Observed: 1.58 ft at 2:00PM Feb 21, 2020Observed: 1.58 ft at 2:15PM Feb 21, 2020Observed: 1.59 ft at 2:30PM Feb 21, 2020Observed: 1.59 ft at 2:45PM Feb 21, 2020Observed: 1.58 ft at 3:00PM Feb 21, 2020Observed: 1.59 ft at 3:15PM Feb 21, 2020Observed: 1.58 ft at 3:30PM Feb 21, 2020Observed: 1.58 ft at 3:45PM Feb 21, 2020Observed: 1.58 ft at 4:00PM Feb 21, 2020Observed: 1.58 ft at 4:15PM Feb 21, 2020Observed: 1.58 ft at 4:30PM Feb 21, 2020Observed: 1.58 ft at 4:45PM Feb 21, 2020Observed: 1.58 ft at 5:00PM Feb 21, 2020Observed: 1.58 ft at 5:15PM Feb 21, 2020Observed: 1.58 ft at 5:30PM Feb 21, 2020Observed: 1.59 ft at 5:45PM Feb 21, 2020Observed: 1.58 ft at 6:00PM Feb 21, 2020Observed: 1.59 ft at 6:15PM Feb 21, 2020Observed: 1.59 ft at 6:30PM Feb 21, 2020Observed: 1.59 ft at 6:45PM Feb 21, 2020Observed: 1.59 ft at 7:00PM Feb 21, 2020Observed: 1.59 ft at 7:15PM Feb 21, 2020Observed: 1.59 ft at 7:30PM Feb 21, 2020Observed: 1.58 ft at 7:45PM Feb 21, 2020Observed: 1.58 ft at 8:00PM Feb 21, 2020Observed: 1.58 ft at 8:15PM Feb 21, 2020Observed: 1.58 ft at 8:30PM Feb 21, 2020Observed: 1.58 ft at 8:45PM Feb 21, 2020Observed: 1.58 ft at 9:00PM Feb 21, 2020Observed: 1.58 ft at 9:15PM Feb 21, 2020Observed: 1.58 ft at 9:30PM Feb 21, 2020Observed: 1.58 ft at 9:45PM Feb 21, 2020Observed: 1.58 ft at 10:00PM Feb 21, 2020Observed: 1.58 ft at 10:15PM Feb 21, 2020Observed: 1.58 ft at 10:30PM Feb 21, 2020Observed: 1.58 ft at 10:45PM Feb 21, 2020Observed: 1.58 ft at 11:00PM Feb 21, 2020Observed: 1.58 ft at 11:15PM Feb 21, 2020Observed: 1.58 ft at 11:30PM Feb 21, 2020Observed: 1.58 ft at 11:45PM Feb 21, 2020Observed: 1.58 ft at 12:00AM Feb 22, 2020Observed: 1.58 ft at 12:15AM Feb 22, 2020Observed: 1.58 ft at 12:30AM Feb 22, 2020Observed: 1.58 ft at 12:45AM Feb 22, 2020Observed: 1.58 ft at 1:00AM Feb 22, 2020Observed: 1.58 ft at 1:15AM Feb 22, 2020Observed: 1.58 ft at 1:30AM Feb 22, 2020Observed: 1.58 ft at 1:45AM Feb 22, 2020Observed: 1.58 ft at 2:00AM Feb 22, 2020USGS--Water Resources of the United StatesGMRM2(plotting HGIRG) Graph Created (2:54AM Feb 22, 2020)ObservedLatest observed value: 1.58 ft at 2:00 AM EST 22-Feb-2020. Flood Stage is 6 ft
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About this graph
Tabular Data (UTC)
Tabular Data (EST)
XML Data
RSS Files
Datum: Not Available
Metadata
NOTE: Gauge reading may be affected by ice.

NOTE: Forecasts are not available for the St. Marys River at Great Mills. Only observed stages are available for this point.

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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
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(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.
Zoom Level:14
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Gauge LocationGauge Map Marker
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Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
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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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Page last modified: 4-Mar-2019 11:30 PM 		Disclaimer
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