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Hydrograph River at a Glance Download
Boston Harbor at Boston (IN MLLW) Tide Height (ft)Observed: 5.93 ft at 3:18AM May 16, 2024Observed: 6.15 ft at 3:24AM May 16, 2024Observed: 6.3 ft at 3:30AM May 16, 2024Observed: 6.44 ft at 3:36AM May 16, 2024Observed: 6.57 ft at 3:42AM May 16, 2024Observed: 6.74 ft at 3:48AM May 16, 2024Observed: 6.85 ft at 3:54AM May 16, 2024Observed: 6.99 ft at 4:00AM May 16, 2024Observed: 7.12 ft at 4:06AM May 16, 2024Observed: 7.26 ft at 4:12AM May 16, 2024Observed: 7.39 ft at 4:18AM May 16, 2024Observed: 7.6 ft at 4:24AM May 16, 2024Observed: 7.78 ft at 4:30AM May 16, 2024Observed: 7.93 ft at 4:36AM May 16, 2024Observed: 8.11 ft at 4:42AM May 16, 2024Observed: 8.31 ft at 4:48AM May 16, 2024Observed: 8.45 ft at 4:54AM May 16, 2024Observed: 8.61 ft at 5:00AM May 16, 2024Observed: 8.75 ft at 5:06AM May 16, 2024Observed: 8.84 ft at 5:12AM May 16, 2024Observed: 8.96 ft at 5:18AM May 16, 2024Observed: 9.08 ft at 5:24AM May 16, 2024Observed: 9.17 ft at 5:30AM May 16, 2024Observed: 9.23 ft at 5:36AM May 16, 2024Observed: 9.35 ft at 5:42AM May 16, 2024Observed: 9.44 ft at 5:48AM May 16, 2024Observed: 9.52 ft at 5:54AM May 16, 2024Observed: 9.64 ft at 6:00AM May 16, 2024Observed: 9.71 ft at 6:06AM May 16, 2024Observed: 9.77 ft at 6:12AM May 16, 2024Observed: 9.83 ft at 6:18AM May 16, 2024Observed: 9.86 ft at 6:24AM May 16, 2024Observed: 9.89 ft at 6:30AM May 16, 2024Observed: 9.88 ft at 6:36AM May 16, 2024Observed: 9.83 ft at 6:42AM May 16, 2024Observed: 9.77 ft at 6:48AM May 16, 2024Observed: 9.71 ft at 6:54AM May 16, 2024Observed: 9.64 ft at 7:00AM May 16, 2024Observed: 9.56 ft at 7:06AM May 16, 2024Observed: 9.47 ft at 7:12AM May 16, 2024Observed: 9.42 ft at 7:18AM May 16, 2024Observed: 9.33 ft at 7:24AM May 16, 2024Observed: 9.26 ft at 7:30AM May 16, 2024Observed: 9.18 ft at 7:36AM May 16, 2024Observed: 9.1 ft at 7:42AM May 16, 2024Observed: 9.03 ft at 7:48AM May 16, 2024Observed: 8.93 ft at 7:54AM May 16, 2024Observed: 8.85 ft at 8:00AM May 16, 2024Observed: 8.76 ft at 8:06AM May 16, 2024Observed: 8.65 ft at 8:12AM May 16, 2024Observed: 8.53 ft at 8:18AM May 16, 2024Observed: 8.42 ft at 8:24AM May 16, 2024Observed: 8.29 ft at 8:30AM May 16, 2024Observed: 8.14 ft at 8:36AM May 16, 2024Observed: 7.97 ft at 8:42AM May 16, 2024Observed: 7.81 ft at 8:48AM May 16, 2024Observed: 7.64 ft at 8:54AM May 16, 2024Observed: 7.51 ft at 9:00AM May 16, 2024Observed: 7.35 ft at 9:06AM May 16, 2024Observed: 7.19 ft at 9:12AM May 16, 2024Observed: 7.07 ft at 9:18AM May 16, 2024Observed: 6.91 ft at 9:24AM May 16, 2024Observed: 6.77 ft at 9:30AM May 16, 2024Observed: 6.61 ft at 9:36AM May 16, 2024Observed: 6.46 ft at 9:42AM May 16, 2024Observed: 6.26 ft at 9:48AM May 16, 2024Observed: 6.06 ft at 9:54AM May 16, 2024Observed: 5.87 ft at 10:00AM May 16, 2024Observed: 5.7 ft at 10:06AM May 16, 2024Observed: 5.49 ft at 10:12AM May 16, 2024Observed: 5.3 ft at 10:18AM May 16, 2024Observed: 5.1 ft at 10:24AM May 16, 2024Observed: 4.93 ft at 10:30AM May 16, 2024Observed: 4.74 ft at 10:36AM May 16, 2024Observed: 4.54 ft at 10:42AM May 16, 2024Observed: 4.35 ft at 10:48AM May 16, 2024Observed: 4.16 ft at 10:54AM May 16, 2024Observed: 3.98 ft at 11:00AM May 16, 2024Observed: 3.8 ft at 11:06AM May 16, 2024Observed: 3.66 ft at 11:12AM May 16, 2024Observed: 3.51 ft at 11:18AM May 16, 2024Observed: 3.37 ft at 11:24AM May 16, 2024Observed: 3.23 ft at 11:30AM May 16, 2024Observed: 3.1 ft at 11:36AM May 16, 2024Observed: 3.01 ft at 11:42AM May 16, 2024Observed: 2.85 ft at 11:48AM May 16, 2024Observed: 2.71 ft at 11:54AM May 16, 2024Observed: 2.6 ft at 12:00PM May 16, 2024Observed: 2.51 ft at 12:06PM May 16, 2024Observed: 2.43 ft at 12:12PM May 16, 2024Observed: 2.33 ft at 12:18PM May 16, 2024Observed: 2.26 ft at 12:24PM May 16, 2024Observed: 2.2 ft at 12:30PM May 16, 2024Observed: 2.15 ft at 12:36PM May 16, 2024Observed: 2.11 ft at 12:42PM May 16, 2024Observed: 2.07 ft at 12:48PM May 16, 2024Observed: 2.05 ft at 12:54PM May 16, 2024Observed: 2.06 ft at 1:00PM May 16, 2024Observed: 2.06 ft at 1:06PM May 16, 2024Observed: 2.09 ft at 1:12PM May 16, 2024Observed: 2.16 ft at 1:18PM May 16, 2024Observed: 2.22 ft at 1:24PM May 16, 2024Observed: 2.29 ft at 1:30PM May 16, 2024Observed: 2.39 ft at 1:36PM May 16, 2024Observed: 2.51 ft at 1:42PM May 16, 2024Observed: 2.6 ft at 1:48PM May 16, 2024Observed: 2.69 ft at 1:54PM May 16, 2024Observed: 2.81 ft at 2:00PM May 16, 2024Observed: 2.91 ft at 2:06PM May 16, 2024Observed: 3 ft at 2:12PM May 16, 2024Observed: 3.09 ft at 2:18PM May 16, 2024Observed: 3.17 ft at 2:24PM May 16, 2024Observed: 3.29 ft at 2:30PM May 16, 2024Observed: 3.38 ft at 2:36PM May 16, 2024Observed: 3.49 ft at 2:42PM May 16, 2024Observed: 3.6 ft at 2:48PM May 16, 2024Observed: 3.73 ft at 2:54PM May 16, 2024Observed: 3.83 ft at 3:00PM May 16, 2024Observed: 4 ft at 3:06PM May 16, 2024Observed: 4.14 ft at 3:12PM May 16, 2024Observed: 4.27 ft at 3:18PM May 16, 2024Observed: 4.41 ft at 3:24PM May 16, 2024Observed: 4.56 ft at 3:30PM May 16, 2024Observed: 4.73 ft at 3:36PM May 16, 2024Observed: 4.92 ft at 3:42PM May 16, 2024Observed: 5.07 ft at 3:48PM May 16, 2024Observed: 5.26 ft at 3:54PM May 16, 2024Observed: 5.41 ft at 4:00PM May 16, 2024Observed: 5.58 ft at 4:06PM May 16, 2024Observed: 5.73 ft at 4:12PM May 16, 2024Observed: 5.9 ft at 4:18PM May 16, 2024Observed: 6.01 ft at 4:24PM May 16, 2024Observed: 6.17 ft at 4:30PM May 16, 2024Observed: 6.32 ft at 4:36PM May 16, 2024Observed: 6.48 ft at 4:42PM May 16, 2024Observed: 6.67 ft at 4:48PM May 16, 2024Observed: 6.88 ft at 4:54PM May 16, 2024Observed: 7.06 ft at 5:00PM May 16, 2024Observed: 7.26 ft at 5:06PM May 16, 2024Observed: 7.47 ft at 5:12PM May 16, 2024Observed: 7.64 ft at 5:18PM May 16, 2024Observed: 7.82 ft at 5:24PM May 16, 2024Observed: 7.97 ft at 5:30PM May 16, 2024Observed: 8.1 ft at 5:36PM May 16, 2024Observed: 8.22 ft at 5:42PM May 16, 2024Observed: 8.33 ft at 5:48PM May 16, 2024Observed: 8.46 ft at 5:54PM May 16, 2024Observed: 8.59 ft at 6:00PM May 16, 2024Observed: 8.68 ft at 6:06PM May 16, 2024Observed: 8.75 ft at 6:12PM May 16, 2024Observed: 8.83 ft at 6:18PM May 16, 2024Observed: 8.9 ft at 6:24PM May 16, 2024Observed: 9 ft at 6:30PM May 16, 2024Observed: 9.05 ft at 6:36PM May 16, 2024Observed: 9.07 ft at 6:42PM May 16, 2024Observed: 9.13 ft at 6:48PM May 16, 2024Observed: 9.18 ft at 6:54PM May 16, 2024Observed: 9.23 ft at 7:00PM May 16, 2024Observed: 9.29 ft at 7:06PM May 16, 2024Observed: 9.32 ft at 7:12PM May 16, 2024Observed: 9.32 ft at 7:18PM May 16, 2024Observed: 9.34 ft at 7:24PM May 16, 2024Observed: 9.32 ft at 7:30PM May 16, 2024Observed: 9.31 ft at 7:36PM May 16, 2024Observed: 9.25 ft at 7:42PM May 16, 2024Observed: 9.19 ft at 7:48PM May 16, 2024Observed: 8.99 ft at 8:06PM May 16, 2024Observed: 8.9 ft at 8:12PM May 16, 2024Observed: 8.84 ft at 8:18PM May 16, 2024Observed: 8.74 ft at 8:24PM May 16, 2024Observed: 8.62 ft at 8:30PM May 16, 2024Observed: 8.51 ft at 8:36PM May 16, 2024Observed: 8.4 ft at 8:42PM May 16, 2024Observed: 8.28 ft at 8:48PM May 16, 2024Observed: 8.17 ft at 8:54PM May 16, 2024Observed: 8.06 ft at 9:00PM May 16, 2024Observed: 7.97 ft at 9:06PM May 16, 2024Observed: 7.86 ft at 9:12PM May 16, 2024Observed: 7.75 ft at 9:18PM May 16, 2024Observed: 7.66 ft at 9:24PM May 16, 2024Observed: 7.54 ft at 9:30PM May 16, 2024Observed: 7.4 ft at 9:36PM May 16, 2024Observed: 7.26 ft at 9:42PM May 16, 2024Observed: 7.1 ft at 9:48PM May 16, 2024Observed: 6.94 ft at 9:54PM May 16, 2024Observed: 6.78 ft at 10:00PM May 16, 2024Observed: 6.63 ft at 10:06PM May 16, 2024Observed: 6.47 ft at 10:12PM May 16, 2024Observed: 6.3 ft at 10:18PM May 16, 2024Observed: 6.14 ft at 10:24PM May 16, 2024Observed: 6.01 ft at 10:30PM May 16, 2024Observed: 5.81 ft at 10:36PM May 16, 2024Observed: 5.65 ft at 10:42PM May 16, 2024Observed: 5.48 ft at 10:48PM May 16, 2024Observed: 5.32 ft at 10:54PM May 16, 2024Observed: 5.14 ft at 11:00PM May 16, 2024Observed: 4.98 ft at 11:06PM May 16, 2024Observed: 4.8 ft at 11:12PM May 16, 2024Observed: 4.66 ft at 11:18PM May 16, 2024Observed: 4.49 ft at 11:24PM May 16, 2024Observed: 4.35 ft at 11:30PM May 16, 2024Observed: 4.17 ft at 11:36PM May 16, 2024Observed: 4.03 ft at 11:42PM May 16, 2024Observed: 3.88 ft at 11:48PM May 16, 2024Observed: 3.73 ft at 11:54PM May 16, 2024Observed: 3.57 ft at 12:00AM May 17, 2024Observed: 3.42 ft at 12:06AM May 17, 2024Observed: 3.32 ft at 12:12AM May 17, 2024Observed: 3.2 ft at 12:18AM May 17, 2024Observed: 3.08 ft at 12:24AM May 17, 2024Observed: 3.02 ft at 12:30AM May 17, 2024Observed: 2.97 ft at 12:36AM May 17, 2024Observed: 2.9 ft at 12:42AM May 17, 2024Observed: 2.84 ft at 12:48AM May 17, 2024Observed: 2.81 ft at 12:54AM May 17, 2024Observed: 2.8 ft at 1:00AM May 17, 2024Observed: 2.79 ft at 1:06AM May 17, 2024Observed: 2.76 ft at 1:12AM May 17, 2024Observed: 2.75 ft at 1:18AM May 17, 2024Observed: 2.76 ft at 1:24AM May 17, 2024Observed: 2.77 ft at 1:30AM May 17, 2024Observed: 2.8 ft at 1:36AM May 17, 2024Observed: 2.83 ft at 1:42AM May 17, 2024Observed: 2.87 ft at 1:48AM May 17, 2024Observed: 2.92 ft at 1:54AM May 17, 2024Observed: 2.98 ft at 2:00AM May 17, 2024Observed: 3.07 ft at 2:06AM May 17, 2024Observed: 3.15 ft at 2:12AM May 17, 2024Observed: 3.23 ft at 2:18AM May 17, 2024Observed: 3.31 ft at 2:24AM May 17, 2024Observed: 3.42 ft at 2:30AM May 17, 2024Observed: 3.53 ft at 2:36AM May 17, 2024Observed: 3.64 ft at 2:42AM May 17, 2024Observed: 3.72 ft at 2:48AM May 17, 2024Observed: 3.87 ft at 2:54AM May 17, 2024Observed: 4.01 ft at 3:00AM May 17, 2024Observed: 4.12 ft at 3:06AM May 17, 2024Observed: 4.25 ft at 3:12AM May 17, 2024Observed: 4.37 ft at 3:18AM May 17, 2024Observed: 4.48 ft at 3:24AM May 17, 2024Observed: 4.58 ft at 3:30AM May 17, 2024Observed: 4.69 ft at 3:36AM May 17, 2024Observed: 4.8 ft at 3:42AM May 17, 2024Observed: 4.92 ft at 3:48AM May 17, 2024Observed: 5.03 ft at 3:54AM May 17, 2024Observed: 5.17 ft at 4:00AM May 17, 2024Observed: 5.33 ft at 4:06AM May 17, 2024Observed: 5.5 ft at 4:12AM May 17, 2024Observed: 5.68 ft at 4:18AM May 17, 2024Observed: 5.85 ft at 4:24AM May 17, 2024Observed: 6.02 ft at 4:30AM May 17, 2024Observed: 6.19 ft at 4:36AM May 17, 2024Observed: 6.36 ft at 4:42AM May 17, 2024Observed: 6.54 ft at 4:48AM May 17, 2024Observed: 6.69 ft at 4:54AM May 17, 2024Observed: 6.83 ft at 5:00AM May 17, 2024Observed: 6.97 ft at 5:06AM May 17, 2024Observed: 7.12 ft at 5:12AM May 17, 2024Observed: 7.29 ft at 5:18AM May 17, 2024Observed: 7.45 ft at 5:24AM May 17, 2024Observed: 7.59 ft at 5:30AM May 17, 2024Observed: 7.77 ft at 5:36AM May 17, 2024Observed: 7.9 ft at 5:42AM May 17, 2024Observed: 8.04 ft at 5:48AM May 17, 2024Observed: 8.19 ft at 5:54AM May 17, 2024Observed: 8.31 ft at 6:00AM May 17, 2024Observed: 8.44 ft at 6:06AM May 17, 2024Observed: 8.55 ft at 6:12AM May 17, 2024Observed: 8.67 ft at 6:18AM May 17, 2024Observed: 8.79 ft at 6:24AM May 17, 2024Observed: 8.91 ft at 6:30AM May 17, 2024Observed: 9.02 ft at 6:36AM May 17, 2024Observed: 9.14 ft at 6:42AM May 17, 2024Observed: 9.21 ft at 6:48AM May 17, 2024Observed: 9.28 ft at 6:54AM May 17, 2024Observed: 9.35 ft at 7:00AM May 17, 2024Observed: 9.37 ft at 7:06AM May 17, 2024Observed: 9.41 ft at 7:12AM May 17, 2024Observed: 9.43 ft at 7:18AM May 17, 2024Observed: 9.43 ft at 7:24AM May 17, 2024Observed: 9.43 ft at 7:30AM May 17, 2024Observed: 9.43 ft at 7:36AM May 17, 2024Observed: 9.41 ft at 7:42AM May 17, 2024Observed: 9.35 ft at 7:48AM May 17, 2024Observed: 9.3 ft at 7:54AM May 17, 2024Observed: 9.25 ft at 8:00AM May 17, 2024Observed: 9.18 ft at 8:06AM May 17, 2024Observed: 9.1 ft at 8:12AM May 17, 2024Observed: 9.05 ft at 8:18AM May 17, 2024Observed: 9 ft at 8:24AM May 17, 2024Observed: 8.96 ft at 8:30AM May 17, 2024Observed: 8.92 ft at 8:36AM May 17, 2024Observed: 8.85 ft at 8:42AM May 17, 2024Observed: 8.75 ft at 8:48AM May 17, 2024Observed: 8.62 ft at 8:54AM May 17, 2024Observed: 8.49 ft at 9:00AM May 17, 2024Observed: 8.38 ft at 9:06AM May 17, 2024Observed: 8.23 ft at 9:12AM May 17, 2024Observed: 8.11 ft at 9:18AM May 17, 2024Observed: 7.97 ft at 9:24AM May 17, 2024Observed: 7.86 ft at 9:30AM May 17, 2024Observed: 7.77 ft at 9:36AM May 17, 2024Observed: 7.65 ft at 9:42AM May 17, 2024Observed: 7.52 ft at 9:48AM May 17, 2024Observed: 7.38 ft at 9:54AM May 17, 2024Observed: 7.21 ft at 10:00AM May 17, 2024Observed: 7.05 ft at 10:06AM May 17, 2024Observed: 6.91 ft at 10:12AM May 17, 2024Observed: 6.76 ft at 10:18AM May 17, 2024Observed: 6.62 ft at 10:24AM May 17, 2024Observed: 6.44 ft at 10:30AM May 17, 2024Observed: 6.29 ft at 10:36AM May 17, 2024Observed: 6.12 ft at 10:42AM May 17, 2024Observed: 5.92 ft at 10:48AM May 17, 2024Observed: 5.72 ft at 10:54AM May 17, 2024Observed: 5.53 ft at 11:00AM May 17, 2024Observed: 5.33 ft at 11:06AM May 17, 2024Observed: 5.15 ft at 11:12AM May 17, 2024Observed: 5.01 ft at 11:18AM May 17, 2024Observed: 4.86 ft at 11:24AM May 17, 2024Observed: 4.69 ft at 11:30AM May 17, 2024Observed: 4.53 ft at 11:36AM May 17, 2024Observed: 4.41 ft at 11:42AM May 17, 2024Observed: 4.27 ft at 11:48AM May 17, 2024Observed: 4.12 ft at 11:54AM May 17, 2024Observed: 3.93 ft at 12:00PM May 17, 2024Observed: 3.77 ft at 12:06PM May 17, 2024Observed: 3.63 ft at 12:12PM May 17, 2024Observed: 3.44 ft at 12:18PM May 17, 2024Observed: 3.29 ft at 12:24PM May 17, 2024Observed: 3.15 ft at 12:30PM May 17, 2024Observed: 3.03 ft at 12:36PM May 17, 2024Observed: 2.89 ft at 12:42PM May 17, 2024Observed: 2.81 ft at 12:48PM May 17, 2024Observed: 2.68 ft at 12:54PM May 17, 2024Observed: 2.6 ft at 1:00PM May 17, 2024Observed: 2.52 ft at 1:06PM May 17, 2024Observed: 2.46 ft at 1:12PM May 17, 2024Observed: 2.38 ft at 1:18PM May 17, 2024Observed: 2.26 ft at 1:24PM May 17, 2024Observed: 2.19 ft at 1:30PM May 17, 2024Observed: 2.16 ft at 1:36PM May 17, 2024Observed: 2.14 ft at 1:42PM May 17, 2024Observed: 2.14 ft at 1:48PM May 17, 2024Observed: 2.15 ft at 1:54PM May 17, 2024Observed: 2.17 ft at 2:00PM May 17, 2024Observed: 2.21 ft at 2:06PM May 17, 2024Observed: 2.26 ft at 2:12PM May 17, 2024Observed: 2.31 ft at 2:18PM May 17, 2024Observed: 2.37 ft at 2:24PM May 17, 2024Observed: 2.45 ft at 2:30PM May 17, 2024Observed: 2.53 ft at 2:36PM May 17, 2024Observed: 2.63 ft at 2:42PM May 17, 2024Observed: 2.73 ft at 2:48PM May 17, 2024Observed: 2.88 ft at 2:54PM May 17, 2024Observed: 2.99 ft at 3:00PM May 17, 2024Observed: 3.09 ft at 3:06PM May 17, 2024Observed: 3.19 ft at 3:12PM May 17, 2024Observed: 3.33 ft at 3:18PM May 17, 2024Observed: 3.46 ft at 3:24PM May 17, 2024Observed: 3.57 ft at 3:30PM May 17, 2024Observed: 3.67 ft at 3:36PM May 17, 2024Observed: 3.8 ft at 3:42PM May 17, 2024Observed: 3.93 ft at 3:48PM May 17, 2024Observed: 4.05 ft at 3:54PM May 17, 2024Observed: 4.18 ft at 4:00PM May 17, 2024Observed: 4.29 ft at 4:06PM May 17, 2024Observed: 4.42 ft at 4:12PM May 17, 2024Observed: 4.56 ft at 4:18PM May 17, 2024Observed: 4.71 ft at 4:24PM May 17, 2024Observed: 4.87 ft at 4:30PM May 17, 2024Observed: 4.98 ft at 4:36PM May 17, 2024Observed: 5.12 ft at 4:42PM May 17, 2024Observed: 5.29 ft at 4:48PM May 17, 2024Observed: 5.49 ft at 4:54PM May 17, 2024Observed: 5.64 ft at 5:00PM May 17, 2024Observed: 5.83 ft at 5:06PM May 17, 2024Observed: 6.05 ft at 5:12PM May 17, 2024Observed: 6.22 ft at 5:18PM May 17, 2024Observed: 6.39 ft at 5:24PM May 17, 2024Observed: 6.58 ft at 5:30PM May 17, 2024Observed: 6.81 ft at 5:36PM May 17, 2024Observed: 6.96 ft at 5:42PM May 17, 2024Observed: 7.14 ft at 5:48PM May 17, 2024Observed: 7.27 ft at 5:54PM May 17, 2024Observed: 7.46 ft at 6:00PM May 17, 2024Observed: 7.61 ft at 6:06PM May 17, 2024Observed: 7.8 ft at 6:12PM May 17, 2024Observed: 7.94 ft at 6:18PM May 17, 2024Observed: 8.09 ft at 6:24PM May 17, 2024Observed: 8.23 ft at 6:30PM May 17, 2024Observed: 8.38 ft at 6:36PM May 17, 2024Observed: 8.53 ft at 6:42PM May 17, 2024Observed: 8.69 ft at 6:48PM May 17, 2024Observed: 8.78 ft at 6:54PM May 17, 2024Observed: 8.85 ft at 7:00PM May 17, 2024Observed: 8.95 ft at 7:06PM May 17, 2024Observed: 9.03 ft at 7:12PM May 17, 2024Observed: 9.09 ft at 7:18PM May 17, 2024Observed: 9.18 ft at 7:24PM May 17, 2024Observed: 9.25 ft at 7:30PM May 17, 2024Observed: 9.32 ft at 7:36PM May 17, 2024Observed: 9.42 ft at 7:42PM May 17, 2024Observed: 9.49 ft at 7:48PM May 17, 2024Observed: 9.54 ft at 8:06PM May 17, 2024Observed: 9.52 ft at 8:12PM May 17, 2024Observed: 9.49 ft at 8:18PM May 17, 2024Observed: 9.47 ft at 8:24PM May 17, 2024Observed: 9.45 ft at 8:30PM May 17, 2024Observed: 9.43 ft at 8:36PM May 17, 2024Observed: 9.4 ft at 8:42PM May 17, 2024Observed: 9.38 ft at 8:48PM May 17, 2024Observed: 9.29 ft at 8:54PM May 17, 2024Observed: 9.23 ft at 9:00PM May 17, 2024Observed: 9.16 ft at 9:06PM May 17, 2024Observed: 9.06 ft at 9:12PM May 17, 2024Observed: 8.96 ft at 9:18PM May 17, 2024Observed: 8.84 ft at 9:24PM May 17, 2024Observed: 8.72 ft at 9:30PM May 17, 2024Observed: 8.62 ft at 9:36PM May 17, 2024Observed: 8.52 ft at 9:42PM May 17, 2024Observed: 8.41 ft at 9:48PM May 17, 2024Observed: 8.3 ft at 9:54PM May 17, 2024Observed: 8.19 ft at 10:00PM May 17, 2024Observed: 8.07 ft at 10:06PM May 17, 2024Observed: 7.92 ft at 10:12PM May 17, 2024Observed: 7.78 ft at 10:18PM May 17, 2024Observed: 7.65 ft at 10:24PM May 17, 2024Observed: 7.48 ft at 10:30PM May 17, 2024Observed: 7.29 ft at 10:36PM May 17, 2024Observed: 7.15 ft at 10:42PM May 17, 2024Observed: 6.99 ft at 10:48PM May 17, 2024Observed: 6.83 ft at 10:54PM May 17, 2024Observed: 6.68 ft at 11:00PM May 17, 2024Observed: 6.52 ft at 11:06PM May 17, 2024Observed: 6.36 ft at 11:12PM May 17, 2024Observed: 6.2 ft at 11:18PM May 17, 2024Observed: 6.01 ft at 11:24PM May 17, 2024Observed: 5.83 ft at 11:30PM May 17, 2024Observed: 5.66 ft at 11:36PM May 17, 2024Observed: 5.5 ft at 11:42PM May 17, 2024Observed: 5.33 ft at 11:48PM May 17, 2024Observed: 5.13 ft at 11:54PM May 17, 2024Observed: 4.99 ft at 12:00AM May 18, 2024Observed: 4.82 ft at 12:06AM May 18, 2024Observed: 4.66 ft at 12:12AM May 18, 2024Observed: 4.47 ft at 12:18AM May 18, 2024Observed: 4.35 ft at 12:24AM May 18, 2024Observed: 4.16 ft at 12:30AM May 18, 2024Observed: 4.02 ft at 12:36AM May 18, 2024Observed: 3.85 ft at 12:42AM May 18, 2024Observed: 3.7 ft at 12:48AM May 18, 2024Observed: 3.55 ft at 12:54AM May 18, 2024Observed: 3.42 ft at 1:00AM May 18, 2024Observed: 3.29 ft at 1:06AM May 18, 2024Observed: 3.14 ft at 1:12AM May 18, 2024Observed: 3.03 ft at 1:18AM May 18, 2024Observed: 2.93 ft at 1:24AM May 18, 2024Observed: 2.85 ft at 1:30AM May 18, 2024Observed: 2.78 ft at 1:36AM May 18, 2024Observed: 2.72 ft at 1:42AM May 18, 2024Observed: 2.68 ft at 1:48AM May 18, 2024Observed: 2.62 ft at 1:54AM May 18, 2024Observed: 2.57 ft at 2:00AM May 18, 2024Observed: 2.54 ft at 2:06AM May 18, 2024Observed: 2.55 ft at 2:12AM May 18, 2024Observed: 2.54 ft at 2:18AM May 18, 2024Observed: 2.52 ft at 2:24AM May 18, 2024Observed: 2.52 ft at 2:30AM May 18, 2024Observed: 2.55 ft at 2:36AM May 18, 2024Observed: 2.62 ft at 2:42AM May 18, 2024Observed: 2.69 ft at 2:48AM May 18, 2024Observed: 2.79 ft at 2:54AM May 18, 2024Observed: 2.87 ft at 3:00AM May 18, 2024Observed: 2.96 ft at 3:06AM May 18, 2024Observed: 3.09 ft at 3:12AM May 18, 2024Observed: 3.2 ft at 3:18AM May 18, 2024Observed: 3.32 ft at 3:24AM May 18, 2024Observed: 3.4 ft at 3:30AM May 18, 2024Observed: 3.49 ft at 3:36AM May 18, 2024Observed: 3.61 ft at 3:42AM May 18, 2024Observed: 3.71 ft at 3:48AM May 18, 2024Observed: 3.83 ft at 3:54AM May 18, 2024Observed: 3.94 ft at 4:00AM May 18, 2024Observed: 4.04 ft at 4:06AM May 18, 2024Observed: 4.15 ft at 4:12AM May 18, 2024Observed: 4.28 ft at 4:18AM May 18, 2024Observed: 4.42 ft at 4:24AM May 18, 2024Observed: 4.59 ft at 4:30AM May 18, 2024Observed: 4.72 ft at 4:36AM May 18, 2024Observed: 4.86 ft at 4:42AM May 18, 2024Observed: 5.03 ft at 4:48AM May 18, 2024Observed: 5.19 ft at 4:54AM May 18, 2024Observed: 5.35 ft at 5:00AM May 18, 2024Observed: 5.5 ft at 5:06AM May 18, 2024Observed: 5.63 ft at 5:12AM May 18, 2024Observed: 5.82 ft at 5:18AM May 18, 2024Observed: 5.99 ft at 5:24AM May 18, 2024Observed: 6.15 ft at 5:30AM May 18, 2024Observed: 6.33 ft at 5:36AM May 18, 2024Observed: 6.5 ft at 5:42AM May 18, 2024Observed: 6.68 ft at 5:48AM May 18, 2024Observed: 6.86 ft at 5:54AM May 18, 2024Observed: 7.03 ft at 6:00AM May 18, 2024Observed: 7.18 ft at 6:06AM May 18, 2024Observed: 7.3 ft at 6:12AM May 18, 2024Observed: 7.44 ft at 6:18AM May 18, 2024Observed: 7.56 ft at 6:24AM May 18, 2024Observed: 7.72 ft at 6:30AM May 18, 2024Observed: 7.86 ft at 6:36AM May 18, 2024Observed: 8.01 ft at 6:42AM May 18, 2024Observed: 8.17 ft at 6:48AM May 18, 2024Observed: 8.34 ft at 6:54AM May 18, 2024Observed: 8.51 ft at 7:00AM May 18, 2024Observed: 8.67 ft at 7:06AM May 18, 2024Observed: 8.79 ft at 7:12AM May 18, 2024Observed: 8.9 ft at 7:18AM May 18, 2024Observed: 9.02 ft at 7:24AM May 18, 2024Observed: 9.07 ft at 7:30AM May 18, 2024Observed: 9.15 ft at 7:36AM May 18, 2024Observed: 9.22 ft at 7:42AM May 18, 2024Observed: 9.28 ft at 7:48AM May 18, 2024Observed: 9.36 ft at 7:54AM May 18, 2024Observed: 9.43 ft at 8:00AM May 18, 2024Observed: 9.49 ft at 8:06AM May 18, 2024Observed: 9.55 ft at 8:12AM May 18, 2024Observed: 9.59 ft at 8:18AM May 18, 2024Observed: 9.62 ft at 8:24AM May 18, 2024Observed: 9.61 ft at 8:30AM May 18, 2024Observed: 9.61 ft at 8:36AM May 18, 2024Observed: 9.61 ft at 8:42AM May 18, 2024Observed: 9.59 ft at 8:48AM May 18, 2024Observed: 9.56 ft at 8:54AM May 18, 2024Observed: 9.52 ft at 9:00AM May 18, 2024Observed: 9.47 ft at 9:06AM May 18, 2024Observed: 9.42 ft at 9:12AM May 18, 2024Observed: 9.35 ft at 9:18AM May 18, 2024Observed: 9.27 ft at 9:24AM May 18, 2024Observed: 9.19 ft at 9:30AM May 18, 2024Observed: 9.11 ft at 9:36AM May 18, 2024Observed: 9 ft at 9:42AM May 18, 2024Observed: 8.91 ft at 9:48AM May 18, 2024Observed: 8.85 ft at 9:54AM May 18, 2024Observed: 8.71 ft at 10:00AM May 18, 2024Observed: 8.59 ft at 10:06AM May 18, 2024Observed: 8.47 ft at 10:12AM May 18, 2024Observed: 8.34 ft at 10:18AM May 18, 2024Observed: 8.2 ft at 10:24AM May 18, 2024Observed: 8.06 ft at 10:30AM May 18, 2024Observed: 7.9 ft at 10:36AM May 18, 2024Observed: 7.76 ft at 10:42AM May 18, 2024Observed: 7.62 ft at 10:48AM May 18, 2024Observed: 7.47 ft at 10:54AM May 18, 2024Observed: 7.32 ft at 11:00AM May 18, 2024Observed: 7.16 ft at 11:06AM May 18, 2024Observed: 6.99 ft at 11:12AM May 18, 2024Observed: 6.85 ft at 11:18AM May 18, 2024Observed: 6.71 ft at 11:24AM May 18, 2024Observed: 6.55 ft at 11:30AM May 18, 2024Observed: 6.41 ft at 11:36AM May 18, 2024Observed: 6.19 ft at 11:42AM May 18, 2024Observed: 6.03 ft at 11:48AM May 18, 2024Observed: 5.82 ft at 11:54AM May 18, 2024Observed: 5.64 ft at 12:00PM May 18, 2024Observed: 5.44 ft at 12:06PM May 18, 2024Observed: 5.26 ft at 12:12PM May 18, 2024Observed: 5.05 ft at 12:18PM May 18, 2024Observed: 4.86 ft at 12:24PM May 18, 2024Observed: 4.68 ft at 12:30PM May 18, 2024Observed: 4.48 ft at 12:36PM May 18, 2024Observed: 4.33 ft at 12:42PM May 18, 2024Observed: 4.16 ft at 12:48PM May 18, 2024Observed: 4.02 ft at 12:54PM May 18, 2024Observed: 3.84 ft at 1:00PM May 18, 2024Observed: 3.72 ft at 1:06PM May 18, 2024Observed: 3.55 ft at 1:12PM May 18, 2024Observed: 3.42 ft at 1:18PM May 18, 2024Observed: 3.26 ft at 1:24PM May 18, 2024Observed: 3.12 ft at 1:30PM May 18, 2024Observed: 2.99 ft at 1:36PM May 18, 2024Observed: 2.85 ft at 1:42PM May 18, 2024Observed: 2.75 ft at 1:48PM May 18, 2024Observed: 2.64 ft at 1:54PM May 18, 2024Observed: 2.54 ft at 2:00PM May 18, 2024Observed: 2.46 ft at 2:06PM May 18, 2024Observed: 2.38 ft at 2:12PM May 18, 2024Observed: 2.33 ft at 2:18PM May 18, 2024Observed: 2.31 ft at 2:24PM May 18, 2024Observed: 2.29 ft at 2:30PM May 18, 2024Observed: 2.3 ft at 2:36PM May 18, 2024Observed: 2.32 ft at 2:42PM May 18, 2024Observed: 2.36 ft at 2:48PM May 18, 2024Observed: 2.39 ft at 2:54PM May 18, 2024Observed: 2.43 ft at 3:00PM May 18, 2024Observed: 2.49 ft at 3:06PM May 18, 2024Observed: 2.55 ft at 3:12PM May 18, 2024Observed: 2.61 ft at 3:18PM May 18, 2024Observed: 2.67 ft at 3:24PM May 18, 2024Observed: 2.76 ft at 3:30PM May 18, 2024Observed: 2.85 ft at 3:36PM May 18, 2024Observed: 2.96 ft at 3:42PM May 18, 2024Observed: 3.06 ft at 3:48PM May 18, 2024Observed: 3.16 ft at 3:54PM May 18, 2024Observed: 3.28 ft at 4:00PM May 18, 2024Observed: 3.4 ft at 4:06PM May 18, 2024Observed: 3.53 ft at 4:12PM May 18, 2024Observed: 3.68 ft at 4:18PM May 18, 2024Observed: 3.83 ft at 4:24PM May 18, 2024Observed: 3.96 ft at 4:30PM May 18, 2024Observed: 4.09 ft at 4:36PM May 18, 2024Observed: 4.21 ft at 4:42PM May 18, 2024Observed: 4.34 ft at 4:48PM May 18, 2024Observed: 4.48 ft at 4:54PM May 18, 2024Observed: 4.59 ft at 5:00PM May 18, 2024Observed: 4.75 ft at 5:06PM May 18, 2024Observed: 4.9 ft at 5:12PM May 18, 2024Observed: 5.08 ft at 5:18PM May 18, 2024Observed: 5.22 ft at 5:24PM May 18, 2024Observed: 5.45 ft at 5:30PM May 18, 2024Observed: 5.6 ft at 5:36PM May 18, 2024Observed: 5.78 ft at 5:42PM May 18, 2024Observed: 5.95 ft at 5:48PM May 18, 2024Observed: 6.15 ft at 5:54PM May 18, 2024Observed: 6.32 ft at 6:00PM May 18, 2024Observed: 6.54 ft at 6:06PM May 18, 2024Observed: 6.73 ft at 6:12PM May 18, 2024Observed: 6.91 ft at 6:18PM May 18, 2024Observed: 7.08 ft at 6:24PM May 18, 2024Observed: 7.28 ft at 6:30PM May 18, 2024Observed: 7.46 ft at 6:36PM May 18, 2024Observed: 7.64 ft at 6:42PM May 18, 2024Observed: 7.8 ft at 6:48PM May 18, 2024Observed: 7.95 ft at 6:54PM May 18, 2024Observed: 8.11 ft at 7:00PM May 18, 2024Observed: 8.29 ft at 7:06PM May 18, 2024Observed: 8.42 ft at 7:12PM May 18, 2024Observed: 8.61 ft at 7:18PM May 18, 2024Observed: 8.78 ft at 7:24PM May 18, 2024Observed: 8.97 ft at 7:30PM May 18, 2024Observed: 9.1 ft at 7:36PM May 18, 2024Observed: 9.24 ft at 7:42PM May 18, 2024Observed: 9.39 ft at 7:48PM May 18, 2024Observed: 9.64 ft at 8:06PM May 18, 2024Observed: 9.7 ft at 8:12PM May 18, 2024Observed: 9.78 ft at 8:18PM May 18, 2024Observed: 9.84 ft at 8:24PM May 18, 2024Observed: 9.91 ft at 8:30PM May 18, 2024Observed: 9.96 ft at 8:36PM May 18, 2024Observed: 9.99 ft at 8:42PM May 18, 2024Observed: 10.01 ft at 8:48PM May 18, 2024Highest Observation: 10.03 ft at 8:54PM May 18, 2024Highest Observation: 10.03 ft at 9:00PM May 18, 2024Observed: 10.01 ft at 9:06PM May 18, 2024Observed: 9.99 ft at 9:12PM May 18, 2024Observed: 9.96 ft at 9:18PM May 18, 2024Observed: 9.94 ft at 9:24PM May 18, 2024Observed: 9.91 ft at 9:30PM May 18, 2024Observed: 9.87 ft at 9:36PM May 18, 2024Observed: 9.83 ft at 9:42PM May 18, 2024Observed: 9.76 ft at 9:48PM May 18, 2024Observed: 9.65 ft at 9:54PM May 18, 2024Observed: 9.54 ft at 10:00PM May 18, 2024Observed: 9.43 ft at 10:06PM May 18, 2024Observed: 9.33 ft at 10:12PM May 18, 2024Observed: 9.22 ft at 10:18PM May 18, 2024Observed: 9.11 ft at 10:24PM May 18, 2024Observed: 8.98 ft at 10:30PM May 18, 2024Observed: 8.86 ft at 10:36PM May 18, 2024Observed: 8.74 ft at 10:42PM May 18, 2024Observed: 8.62 ft at 10:48PM May 18, 2024Observed: 8.49 ft at 10:54PM May 18, 2024Observed: 8.35 ft at 11:00PM May 18, 2024Observed: 8.2 ft at 11:06PM May 18, 2024Observed: 8.05 ft at 11:12PM May 18, 2024Observed: 7.89 ft at 11:18PM May 18, 2024Observed: 7.72 ft at 11:24PM May 18, 2024Observed: 7.55 ft at 11:30PM May 18, 2024Observed: 7.36 ft at 11:36PM May 18, 2024Observed: 7.18 ft at 11:42PM May 18, 2024Observed: 7.04 ft at 11:48PM May 18, 2024Observed: 6.88 ft at 11:54PM May 18, 2024Observed: 6.7 ft at 12:00AM May 19, 2024Observed: 6.53 ft at 12:06AM May 19, 2024Observed: 6.35 ft at 12:12AM May 19, 2024Observed: 6.17 ft at 12:18AM May 19, 2024Observed: 5.98 ft at 12:24AM May 19, 2024Observed: 5.78 ft at 12:30AM May 19, 2024Observed: 5.59 ft at 12:36AM May 19, 2024Observed: 5.39 ft at 12:42AM May 19, 2024Observed: 5.21 ft at 12:48AM May 19, 2024Observed: 5.04 ft at 12:54AM May 19, 2024Observed: 4.84 ft at 1:00AM May 19, 2024Observed: 4.64 ft at 1:06AM May 19, 2024Observed: 4.45 ft at 1:12AM May 19, 2024Observed: 4.27 ft at 1:18AM May 19, 2024Observed: 4.09 ft at 1:24AM May 19, 2024Observed: 3.9 ft at 1:30AM May 19, 2024Observed: 3.73 ft at 1:36AM May 19, 2024Observed: 3.58 ft at 1:42AM May 19, 2024Observed: 3.44 ft at 1:48AM May 19, 2024Observed: 3.32 ft at 1:54AM May 19, 2024Observed: 3.19 ft at 2:00AM May 19, 2024Observed: 3.1 ft at 2:06AM May 19, 2024Observed: 3.02 ft at 2:12AM May 19, 2024Observed: 2.92 ft at 2:18AM May 19, 2024Observed: 2.83 ft at 2:24AM May 19, 2024Observed: 2.74 ft at 2:30AM May 19, 2024Observed: 2.67 ft at 2:36AM May 19, 2024Observed: 2.61 ft at 2:42AM May 19, 2024Forecast: 3 ft 4:00AM May 19, 2024Forecast: 4 ft 5:00AM May 19, 2024Forecast: 5.6 ft 6:00AM May 19, 2024Forecast: 7.5 ft 7:00AM May 19, 2024Forecast: 9 ft 8:00AM May 19, 2024Forecast: 9.6 ft 9:00AM May 19, 2024Forecast: 9.4 ft 10:00AM May 19, 2024Forecast: 8.5 ft 11:00AM May 19, 2024Forecast: 7 ft 12:00PM May 19, 2024Forecast: 5.2 ft 1:00PM May 19, 2024Forecast: 3.6 ft 2:00PM May 19, 2024Forecast: 2.7 ft 3:00PM May 19, 2024Forecast: 3 ft 4:00PM May 19, 2024Forecast: 3.9 ft 5:00PM May 19, 2024Forecast: 5.4 ft 6:00PM May 19, 2024Forecast: 7.3 ft 7:00PM May 19, 2024Forecast: 9.1 ft 8:00PM May 19, 2024Forecast: 10.2 ft 9:00PM May 19, 2024Highest Forecast: 10.3 ft 10:00PM May 19, 2024Forecast: 9.3 ft 11:00PM May 19, 2024Forecast: 7.9 ft 12:00AM May 20, 2024Forecast: 5.9 ft 1:00AM May 20, 2024Forecast: 3.9 ft 2:00AM May 20, 2024Forecast: 2.4 ft 3:00AM May 20, 2024Forecast: 2.2 ft 4:00AM May 20, 2024Forecast: 2.8 ft 5:00AM May 20, 2024Forecast: 4 ft 6:00AM May 20, 2024Forecast: 5.8 ft 7:00AM May 20, 2024Forecast: 7.7 ft 8:00AM May 20, 2024Forecast: 9.1 ft 9:00AM May 20, 2024Forecast: 9.5 ft 10:00AM May 20, 2024Forecast: 9.1 ft 11:00AM May 20, 2024Forecast: 7.9 ft 12:00PM May 20, 2024Forecast: 6.4 ft 1:00PM May 20, 2024Forecast: 4.5 ft 2:00PM May 20, 2024Forecast: 3 ft 3:00PM May 20, 2024Forecast: 2.4 ft 4:00PM May 20, 2024Forecast: 2.9 ft 5:00PM May 20, 2024Forecast: 4.1 ft 6:00PM May 20, 2024Forecast: 5.8 ft 7:00PM May 20, 2024Forecast: 7.9 ft 8:00PM May 20, 2024Forecast: 9.5 ft 9:00PM May 20, 2024Highest Forecast: 10.3 ft 10:00PM May 20, 2024Forecast: 10 ft 11:00PM May 20, 2024Forecast: 8.9 ft 12:00AM May 21, 2024Forecast: 7.2 ft 1:00AM May 21, 2024Forecast: 5 ft 2:00AM May 21, 2024Forecast: 3 ft 3:00AM May 21, 2024Forecast: 1.8 ft 4:00AM May 21, 2024Forecast: 1.6 ft 5:00AM May 21, 2024Forecast: 2.5 ft 6:00AM May 21, 2024Forecast: 4 ft 7:00AM May 21, 2024Forecast: 5.9 ft 8:00AM May 21, 2024Forecast: 7.8 ft 9:00AM May 21, 2024Forecast: 9.1 ft 10:00AM May 21, 2024Forecast: 9.4 ft 11:00AM May 21, 2024Forecast: 8.6 ft 12:00PM May 21, 2024Forecast: 7.3 ft 1:00PM May 21, 2024Forecast: 5.6 ft 2:00PM May 21, 2024Forecast: 3.7 ft 3:00PM May 21, 2024NOAA Center for Operational Oceanographic Products and ServicesBHBM3(plotting HMIRP) Graph Created (3:15AM May 19, 2024)ObservedForecast (issued 4:08PM May 18)Latest observed value: 2.61 ft at 2:42 AM EDT 19-May-2024. Flood Stage is 12.5 ft
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Tabular Data (UTC)
Tabular Data (EDT)
XML Data
RSS Files
Datum: Not Available
Metadata
NOTE: Please refer to our Coastal Hazard Message for specific information regarding Coastal Flood Watches, Warnings and Advisories. Actual impacts from any coastal flooding event may vary due to factors such as rainfall, wave action, and the number of tide cycles during which there is an onshore flow. During tropical cyclones, please refer here for additional storm surge information.

NOTE: During a Tropical Storm or Hurricane Watch or Warning, inundation mapping provided by the National Hurricane Center (go to the web site and select the storm of interest) reflects a reasonable worst case scenario. The forecast above is the total water forecast that is most likely to occur.

NOTE: Forecasts for the Boston Harbor at Boston (IN MLLW) are issued routinely year-round.

Vertical Datum references a tidal datum...for more information see Tides and Currents .

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Flood Categories (in feet)
Major Flood Stage: 15
Moderate Flood Stage: 14
Flood Stage: 12.5
Action Stage: 11.5
Low Stage (in feet): -9999

Historic Crests
(1) 15.16 ft on 01/04/2018
(2) 15.10 ft on 02/07/1978
(3) 14.67 ft on 03/02/2018
(4) 14.41 ft on 01/13/2024
(5) 14.20 ft on 01/02/1987
(6) 14.14 ft on 10/30/1991
(7) 14.04 ft on 01/10/2024
(8) 14.03 ft on 12/12/1992
(9) 13.97 ft on 12/23/2022
(10) 13.87 ft on 03/03/2018
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 13.45 ft on 03/10/2024
(2) 13.32 ft on 02/13/2024
(3) 12.77 ft on 02/12/2024
(4) 12.85 ft on 02/11/2024
(5) 13.00 ft on 02/10/2024
(6) 12.52 ft on 02/09/2024
(7) 14.41 ft on 01/13/2024
(8) 14.04 ft on 01/10/2024
(9) 12.69 ft on 12/18/2023
(10) 12.56 ft on 06/06/2023
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:16
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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
16 This is a degree of flooding that has never been experienced before. Life threatening flooding more than 3 feet deep affects homes and roads from Revere and Winthrop through Hull, Quincy, Braintree, and Weymouth. In Boston, deep flooding affects the Seaport District including Atlantic Avenue, Long Wharf, and the Aquarium MBTA Station. Flooding will occur several hours before and after high tide. Follow the instructions of local officials and evacuate if asked to do so. Find alternate travel routes.
15 This is a degree of flooding rarely seen. Life threatening flooding more than 3 feet deep affects many coastal roads and homes in low lying areas in Revere, Winthrop, Hull, Weymouth, Braintree, and Quincy. In Boston, deep flooding affects the Seaport District including Atlantic Avenue, Long Wharf, and the Aquarium MBTA Station. Flooding will occur several hours before and after high tide. Follow the instructions of local officials and evacuate if asked to do so. Find alternate travel routes.
14.5 This is a serious flood situation. Many coastal roads become impassable. Flooding 2 to 3 feet deep affects roads and homes in low lying areas in Revere, Winthrop, Hull, Weymouth, Braintree, and Quincy. In Boston, flooding affects the Seaport District including Long Wharf and the Aquarium MBTA Station. Splashover and debris washes onto coastal roads when large waves occur.
14 Many coastal roads become impassable. Flooding 1 to 3 feet deep affects coastal roads and some homes in low lying areas in Revere, Winthrop, Hull, Weymouth, Braintree, and Quincy. In Boston, flooding affects portions of the waterfront including Long Wharf and the Aquarium MBTA Station. Splashover and debris washes onto coastal roads when large waves occur.
13.5 Some vulnerable coastal roads become impassable around high tide. Flooding 1 to 2 feet deep affects some coastal roads and low lying areas from Revere and Winthrop through Boston to Hull, Braintree, and Quincy. Splashover and debris may wash onto coastal roads when large waves occur.
12.5 Shallow pockets of flooding less than one foot deep affects the lowest lying areas, including Morrissey Boulevard in Boston.
Photos
(1) Boston Harbor Tidal Station
About This Location Collapse

Latitude: 42.353900° N, Longitude: 71.050300° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 12.5 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 -5.51 6.99 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 -5.21 7.29 Older USGS topographic maps, MSL benchmarks
Other Not Available 12.5 MLLW (Mean Lower Low Water)
Additional Information Collapse
**Coastal flooding can occur at a stage of 12 feet, when onshore winds are present along with 20 foot seas.** Boston Harbor gage data and forecasts are in feet Mean Lower Low Water (MLLW).
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Hydrologic Resources Additional Resources
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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
Boston / Norton Weather Forecast Office
46 Commerce Way
Norton, MA 02766
(508) 622-3250
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