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Hydrograph River at a Glance Download
Boston Harbor at Boston (IN MLLW) Tide Height (ft)Observed: 4.61 ft at 7:36PM Apr 13, 2024Observed: 4.45 ft at 7:42PM Apr 13, 2024Observed: 4.25 ft at 7:48PM Apr 13, 2024Observed: 3.64 ft at 8:06PM Apr 13, 2024Observed: 3.41 ft at 8:12PM Apr 13, 2024Observed: 3.23 ft at 8:18PM Apr 13, 2024Observed: 3.02 ft at 8:24PM Apr 13, 2024Observed: 2.86 ft at 8:30PM Apr 13, 2024Observed: 2.71 ft at 8:36PM Apr 13, 2024Observed: 2.54 ft at 8:42PM Apr 13, 2024Observed: 2.46 ft at 8:48PM Apr 13, 2024Observed: 2.31 ft at 8:54PM Apr 13, 2024Observed: 2.19 ft at 9:00PM Apr 13, 2024Observed: 2.05 ft at 9:06PM Apr 13, 2024Observed: 1.92 ft at 9:12PM Apr 13, 2024Observed: 1.83 ft at 9:18PM Apr 13, 2024Observed: 1.77 ft at 9:24PM Apr 13, 2024Observed: 1.72 ft at 9:30PM Apr 13, 2024Observed: 1.68 ft at 9:36PM Apr 13, 2024Observed: 1.66 ft at 9:42PM Apr 13, 2024Observed: 1.68 ft at 9:48PM Apr 13, 2024Observed: 1.7 ft at 9:54PM Apr 13, 2024Observed: 1.74 ft at 10:00PM Apr 13, 2024Observed: 1.78 ft at 10:06PM Apr 13, 2024Observed: 1.84 ft at 10:12PM Apr 13, 2024Observed: 1.92 ft at 10:18PM Apr 13, 2024Observed: 1.98 ft at 10:24PM Apr 13, 2024Observed: 2.11 ft at 10:30PM Apr 13, 2024Observed: 2.21 ft at 10:36PM Apr 13, 2024Observed: 2.32 ft at 10:42PM Apr 13, 2024Observed: 2.46 ft at 10:48PM Apr 13, 2024Observed: 2.57 ft at 10:54PM Apr 13, 2024Observed: 2.69 ft at 11:00PM Apr 13, 2024Observed: 2.85 ft at 11:06PM Apr 13, 2024Observed: 3.01 ft at 11:12PM Apr 13, 2024Observed: 3.15 ft at 11:18PM Apr 13, 2024Observed: 3.33 ft at 11:24PM Apr 13, 2024Observed: 3.49 ft at 11:30PM Apr 13, 2024Observed: 3.66 ft at 11:36PM Apr 13, 2024Observed: 3.84 ft at 11:42PM Apr 13, 2024Observed: 3.99 ft at 11:48PM Apr 13, 2024Observed: 4.16 ft at 11:54PM Apr 13, 2024Observed: 4.33 ft at 12:00AM Apr 14, 2024Observed: 4.52 ft at 12:06AM Apr 14, 2024Observed: 4.7 ft at 12:12AM Apr 14, 2024Observed: 4.94 ft at 12:18AM Apr 14, 2024Observed: 5.15 ft at 12:24AM Apr 14, 2024Observed: 5.39 ft at 12:30AM Apr 14, 2024Observed: 5.62 ft at 12:36AM Apr 14, 2024Observed: 5.84 ft at 12:42AM Apr 14, 2024Observed: 6.05 ft at 12:48AM Apr 14, 2024Observed: 6.27 ft at 12:54AM Apr 14, 2024Observed: 6.46 ft at 1:00AM Apr 14, 2024Observed: 6.66 ft at 1:06AM Apr 14, 2024Observed: 6.85 ft at 1:12AM Apr 14, 2024Observed: 7.08 ft at 1:18AM Apr 14, 2024Observed: 7.31 ft at 1:24AM Apr 14, 2024Observed: 7.55 ft at 1:30AM Apr 14, 2024Observed: 7.77 ft at 1:36AM Apr 14, 2024Observed: 7.97 ft at 1:42AM Apr 14, 2024Observed: 8.17 ft at 1:48AM Apr 14, 2024Observed: 8.36 ft at 1:54AM Apr 14, 2024Observed: 8.53 ft at 2:00AM Apr 14, 2024Observed: 8.7 ft at 2:06AM Apr 14, 2024Observed: 8.9 ft at 2:12AM Apr 14, 2024Observed: 9.08 ft at 2:18AM Apr 14, 2024Observed: 9.27 ft at 2:24AM Apr 14, 2024Observed: 9.45 ft at 2:30AM Apr 14, 2024Observed: 9.65 ft at 2:36AM Apr 14, 2024Observed: 9.83 ft at 2:42AM Apr 14, 2024Observed: 9.97 ft at 2:48AM Apr 14, 2024Observed: 10.13 ft at 2:54AM Apr 14, 2024Observed: 10.25 ft at 3:00AM Apr 14, 2024Observed: 10.38 ft at 3:06AM Apr 14, 2024Observed: 10.48 ft at 3:12AM Apr 14, 2024Observed: 10.59 ft at 3:18AM Apr 14, 2024Observed: 10.68 ft at 3:24AM Apr 14, 2024Observed: 10.75 ft at 3:30AM Apr 14, 2024Observed: 10.81 ft at 3:36AM Apr 14, 2024Observed: 10.89 ft at 3:42AM Apr 14, 2024Observed: 10.92 ft at 3:48AM Apr 14, 2024Highest Observation: 10.95 ft at 3:54AM Apr 14, 2024Observed: 10.94 ft at 4:00AM Apr 14, 2024Observed: 10.94 ft at 4:06AM Apr 14, 2024Observed: 10.93 ft at 4:12AM Apr 14, 2024Observed: 10.9 ft at 4:18AM Apr 14, 2024Observed: 10.86 ft at 4:24AM Apr 14, 2024Observed: 10.81 ft at 4:30AM Apr 14, 2024Observed: 10.73 ft at 4:36AM Apr 14, 2024Observed: 10.65 ft at 4:42AM Apr 14, 2024Observed: 10.56 ft at 4:48AM Apr 14, 2024Observed: 10.44 ft at 4:54AM Apr 14, 2024Observed: 10.31 ft at 5:00AM Apr 14, 2024Observed: 10.16 ft at 5:06AM Apr 14, 2024Observed: 10.01 ft at 5:12AM Apr 14, 2024Observed: 9.86 ft at 5:18AM Apr 14, 2024Observed: 9.7 ft at 5:24AM Apr 14, 2024Observed: 9.55 ft at 5:30AM Apr 14, 2024Observed: 9.4 ft at 5:36AM Apr 14, 2024Observed: 9.24 ft at 5:42AM Apr 14, 2024Observed: 9.07 ft at 5:48AM Apr 14, 2024Observed: 8.9 ft at 5:54AM Apr 14, 2024Observed: 8.74 ft at 6:00AM Apr 14, 2024Observed: 8.57 ft at 6:06AM Apr 14, 2024Observed: 8.39 ft at 6:12AM Apr 14, 2024Observed: 8.2 ft at 6:18AM Apr 14, 2024Observed: 8.01 ft at 6:24AM Apr 14, 2024Observed: 7.82 ft at 6:30AM Apr 14, 2024Observed: 7.62 ft at 6:36AM Apr 14, 2024Observed: 7.41 ft at 6:42AM Apr 14, 2024Observed: 7.19 ft at 6:48AM Apr 14, 2024Observed: 6.97 ft at 6:54AM Apr 14, 2024Observed: 6.73 ft at 7:00AM Apr 14, 2024Observed: 6.5 ft at 7:06AM Apr 14, 2024Observed: 6.26 ft at 7:12AM Apr 14, 2024Observed: 6.03 ft at 7:18AM Apr 14, 2024Observed: 5.79 ft at 7:24AM Apr 14, 2024Observed: 5.55 ft at 7:30AM Apr 14, 2024Observed: 5.32 ft at 7:36AM Apr 14, 2024Observed: 5.07 ft at 7:42AM Apr 14, 2024Observed: 4.82 ft at 7:48AM Apr 14, 2024Observed: 4.6 ft at 7:54AM Apr 14, 2024Observed: 4.36 ft at 8:00AM Apr 14, 2024Observed: 4.12 ft at 8:06AM Apr 14, 2024Observed: 3.89 ft at 8:12AM Apr 14, 2024Observed: 3.66 ft at 8:18AM Apr 14, 2024Observed: 3.45 ft at 8:24AM Apr 14, 2024Observed: 3.21 ft at 8:30AM Apr 14, 2024Observed: 2.99 ft at 8:36AM Apr 14, 2024Observed: 2.79 ft at 8:42AM Apr 14, 2024Observed: 2.57 ft at 8:48AM Apr 14, 2024Observed: 2.37 ft at 8:54AM Apr 14, 2024Observed: 2.17 ft at 9:00AM Apr 14, 2024Observed: 1.97 ft at 9:06AM Apr 14, 2024Observed: 1.78 ft at 9:12AM Apr 14, 2024Observed: 1.58 ft at 9:18AM Apr 14, 2024Observed: 1.42 ft at 9:24AM Apr 14, 2024Observed: 1.25 ft at 9:30AM Apr 14, 2024Observed: 1.08 ft at 9:36AM Apr 14, 2024Observed: 0.98 ft at 9:42AM Apr 14, 2024Observed: 0.85 ft at 9:48AM Apr 14, 2024Observed: 0.77 ft at 9:54AM Apr 14, 2024Observed: 0.7 ft at 10:00AM Apr 14, 2024Observed: 0.67 ft at 10:06AM Apr 14, 2024Observed: 0.6 ft at 10:12AM Apr 14, 2024Observed: 0.58 ft at 10:18AM Apr 14, 2024Observed: 0.58 ft at 10:24AM Apr 14, 2024Observed: 0.58 ft at 10:30AM Apr 14, 2024Observed: 0.6 ft at 10:36AM Apr 14, 2024Observed: 0.66 ft at 10:42AM Apr 14, 2024Observed: 0.69 ft at 10:48AM Apr 14, 2024Observed: 0.74 ft at 10:54AM Apr 14, 2024Observed: 0.8 ft at 11:00AM Apr 14, 2024Observed: 0.89 ft at 11:06AM Apr 14, 2024Observed: 0.98 ft at 11:12AM Apr 14, 2024Observed: 1.07 ft at 11:18AM Apr 14, 2024Observed: 1.16 ft at 11:24AM Apr 14, 2024Observed: 1.31 ft at 11:30AM Apr 14, 2024Observed: 1.43 ft at 11:36AM Apr 14, 2024Observed: 1.58 ft at 11:42AM Apr 14, 2024Observed: 1.72 ft at 11:48AM Apr 14, 2024Observed: 1.85 ft at 11:54AM Apr 14, 2024Observed: 2 ft at 12:00PM Apr 14, 2024Observed: 2.14 ft at 12:06PM Apr 14, 2024Observed: 2.3 ft at 12:12PM Apr 14, 2024Observed: 2.43 ft at 12:18PM Apr 14, 2024Observed: 2.53 ft at 12:24PM Apr 14, 2024Observed: 2.65 ft at 12:30PM Apr 14, 2024Observed: 2.8 ft at 12:36PM Apr 14, 2024Observed: 3.02 ft at 12:42PM Apr 14, 2024Observed: 3.18 ft at 12:48PM Apr 14, 2024Observed: 3.4 ft at 12:54PM Apr 14, 2024Observed: 3.6 ft at 1:00PM Apr 14, 2024Observed: 3.83 ft at 1:06PM Apr 14, 2024Observed: 4.01 ft at 1:12PM Apr 14, 2024Observed: 4.25 ft at 1:18PM Apr 14, 2024Observed: 4.42 ft at 1:24PM Apr 14, 2024Observed: 4.56 ft at 1:30PM Apr 14, 2024Observed: 4.81 ft at 1:36PM Apr 14, 2024Observed: 5.01 ft at 1:42PM Apr 14, 2024Observed: 5.22 ft at 1:48PM Apr 14, 2024Observed: 5.45 ft at 1:54PM Apr 14, 2024Observed: 5.65 ft at 2:00PM Apr 14, 2024Observed: 5.9 ft at 2:06PM Apr 14, 2024Observed: 6.1 ft at 2:12PM Apr 14, 2024Observed: 6.32 ft at 2:18PM Apr 14, 2024Observed: 6.49 ft at 2:24PM Apr 14, 2024Observed: 6.63 ft at 2:30PM Apr 14, 2024Observed: 6.79 ft at 2:36PM Apr 14, 2024Observed: 7.01 ft at 2:42PM Apr 14, 2024Observed: 7.25 ft at 2:48PM Apr 14, 2024Observed: 7.47 ft at 2:54PM Apr 14, 2024Observed: 7.67 ft at 3:00PM Apr 14, 2024Observed: 7.86 ft at 3:06PM Apr 14, 2024Observed: 8.04 ft at 3:12PM Apr 14, 2024Observed: 8.22 ft at 3:18PM Apr 14, 2024Observed: 8.41 ft at 3:24PM Apr 14, 2024Observed: 8.52 ft at 3:30PM Apr 14, 2024Observed: 8.66 ft at 3:36PM Apr 14, 2024Observed: 8.79 ft at 3:42PM Apr 14, 2024Observed: 8.91 ft at 3:48PM Apr 14, 2024Observed: 9.04 ft at 3:54PM Apr 14, 2024Observed: 9.17 ft at 4:00PM Apr 14, 2024Observed: 9.27 ft at 4:06PM Apr 14, 2024Observed: 9.34 ft at 4:12PM Apr 14, 2024Observed: 9.4 ft at 4:18PM Apr 14, 2024Observed: 9.47 ft at 4:24PM Apr 14, 2024Observed: 9.5 ft at 4:30PM Apr 14, 2024Observed: 9.52 ft at 4:36PM Apr 14, 2024Observed: 9.54 ft at 4:42PM Apr 14, 2024Observed: 9.54 ft at 4:48PM Apr 14, 2024Observed: 9.52 ft at 4:54PM Apr 14, 2024Observed: 9.5 ft at 5:00PM Apr 14, 2024Observed: 9.48 ft at 5:06PM Apr 14, 2024Observed: 9.45 ft at 5:12PM Apr 14, 2024Observed: 9.39 ft at 5:18PM Apr 14, 2024Observed: 9.29 ft at 5:24PM Apr 14, 2024Observed: 9.15 ft at 5:30PM Apr 14, 2024Observed: 9.07 ft at 5:36PM Apr 14, 2024Observed: 8.96 ft at 5:42PM Apr 14, 2024Observed: 8.87 ft at 5:48PM Apr 14, 2024Observed: 8.77 ft at 5:54PM Apr 14, 2024Observed: 8.67 ft at 6:00PM Apr 14, 2024Observed: 8.63 ft at 6:06PM Apr 14, 2024Observed: 8.55 ft at 6:12PM Apr 14, 2024Observed: 8.45 ft at 6:18PM Apr 14, 2024Observed: 8.37 ft at 6:24PM Apr 14, 2024Observed: 8.27 ft at 6:30PM Apr 14, 2024Observed: 8.13 ft at 6:36PM Apr 14, 2024Observed: 8.02 ft at 6:42PM Apr 14, 2024Observed: 7.87 ft at 6:48PM Apr 14, 2024Observed: 7.7 ft at 6:54PM Apr 14, 2024Observed: 7.57 ft at 7:00PM Apr 14, 2024Observed: 7.41 ft at 7:06PM Apr 14, 2024Observed: 7.27 ft at 7:12PM Apr 14, 2024Observed: 7.13 ft at 7:18PM Apr 14, 2024Observed: 6.97 ft at 7:24PM Apr 14, 2024Observed: 6.78 ft at 7:30PM Apr 14, 2024Observed: 6.63 ft at 7:36PM Apr 14, 2024Observed: 6.45 ft at 7:42PM Apr 14, 2024Observed: 6.28 ft at 7:48PM Apr 14, 2024Observed: 5.69 ft at 8:06PM Apr 14, 2024Observed: 5.5 ft at 8:12PM Apr 14, 2024Observed: 5.33 ft at 8:18PM Apr 14, 2024Observed: 5.17 ft at 8:24PM Apr 14, 2024Observed: 4.99 ft at 8:30PM Apr 14, 2024Observed: 4.79 ft at 8:36PM Apr 14, 2024Observed: 4.6 ft at 8:42PM Apr 14, 2024Observed: 4.41 ft at 8:48PM Apr 14, 2024Observed: 4.19 ft at 8:54PM Apr 14, 2024Observed: 3.98 ft at 9:00PM Apr 14, 2024Observed: 3.8 ft at 9:06PM Apr 14, 2024Observed: 3.62 ft at 9:12PM Apr 14, 2024Observed: 3.43 ft at 9:18PM Apr 14, 2024Observed: 3.29 ft at 9:24PM Apr 14, 2024Observed: 3.15 ft at 9:30PM Apr 14, 2024Observed: 3.03 ft at 9:36PM Apr 14, 2024Observed: 2.96 ft at 9:42PM Apr 14, 2024Observed: 2.87 ft at 9:48PM Apr 14, 2024Observed: 2.77 ft at 9:54PM Apr 14, 2024Observed: 2.72 ft at 10:00PM Apr 14, 2024Observed: 2.61 ft at 10:06PM Apr 14, 2024Observed: 2.51 ft at 10:12PM Apr 14, 2024Observed: 2.48 ft at 10:18PM Apr 14, 2024Observed: 2.37 ft at 10:24PM Apr 14, 2024Observed: 2.29 ft at 10:30PM Apr 14, 2024Observed: 2.25 ft at 10:36PM Apr 14, 2024Observed: 2.24 ft at 10:42PM Apr 14, 2024Observed: 2.27 ft at 10:48PM Apr 14, 2024Observed: 2.29 ft at 10:54PM Apr 14, 2024Observed: 2.33 ft at 11:00PM Apr 14, 2024Observed: 2.39 ft at 11:06PM Apr 14, 2024Observed: 2.49 ft at 11:12PM Apr 14, 2024Observed: 2.57 ft at 11:18PM Apr 14, 2024Observed: 2.67 ft at 11:24PM Apr 14, 2024Observed: 2.79 ft at 11:30PM Apr 14, 2024Observed: 2.91 ft at 11:36PM Apr 14, 2024Observed: 3.01 ft at 11:42PM Apr 14, 2024Observed: 3.13 ft at 11:48PM Apr 14, 2024Observed: 3.29 ft at 11:54PM Apr 14, 2024Observed: 3.43 ft at 12:00AM Apr 15, 2024Observed: 3.56 ft at 12:06AM Apr 15, 2024Observed: 3.67 ft at 12:12AM Apr 15, 2024Observed: 3.8 ft at 12:18AM Apr 15, 2024Observed: 3.95 ft at 12:24AM Apr 15, 2024Observed: 4.11 ft at 12:30AM Apr 15, 2024Observed: 4.26 ft at 12:36AM Apr 15, 2024Observed: 4.42 ft at 12:42AM Apr 15, 2024Observed: 4.59 ft at 12:48AM Apr 15, 2024Observed: 4.77 ft at 12:54AM Apr 15, 2024Observed: 4.98 ft at 1:00AM Apr 15, 2024Observed: 5.14 ft at 1:06AM Apr 15, 2024Observed: 5.31 ft at 1:12AM Apr 15, 2024Observed: 5.46 ft at 1:18AM Apr 15, 2024Observed: 5.67 ft at 1:24AM Apr 15, 2024Observed: 5.84 ft at 1:30AM Apr 15, 2024Observed: 6.01 ft at 1:36AM Apr 15, 2024Observed: 6.22 ft at 1:42AM Apr 15, 2024Observed: 6.39 ft at 1:48AM Apr 15, 2024Observed: 6.61 ft at 1:54AM Apr 15, 2024Observed: 6.84 ft at 2:00AM Apr 15, 2024Observed: 7.08 ft at 2:06AM Apr 15, 2024Observed: 7.27 ft at 2:12AM Apr 15, 2024Observed: 7.46 ft at 2:18AM Apr 15, 2024Observed: 7.61 ft at 2:24AM Apr 15, 2024Observed: 7.81 ft at 2:30AM Apr 15, 2024Observed: 7.93 ft at 2:36AM Apr 15, 2024Observed: 8.09 ft at 2:42AM Apr 15, 2024Observed: 8.24 ft at 2:48AM Apr 15, 2024Observed: 8.41 ft at 2:54AM Apr 15, 2024Observed: 8.57 ft at 3:00AM Apr 15, 2024Observed: 8.81 ft at 3:06AM Apr 15, 2024Observed: 9.03 ft at 3:12AM Apr 15, 2024Observed: 9.2 ft at 3:18AM Apr 15, 2024Observed: 9.4 ft at 3:24AM Apr 15, 2024Observed: 9.59 ft at 3:30AM Apr 15, 2024Observed: 9.73 ft at 3:36AM Apr 15, 2024Observed: 9.89 ft at 3:42AM Apr 15, 2024Observed: 9.99 ft at 3:48AM Apr 15, 2024Observed: 10.13 ft at 3:54AM Apr 15, 2024Observed: 10.22 ft at 4:00AM Apr 15, 2024Observed: 10.34 ft at 4:06AM Apr 15, 2024Observed: 10.48 ft at 4:12AM Apr 15, 2024Observed: 10.54 ft at 4:18AM Apr 15, 2024Observed: 10.61 ft at 4:24AM Apr 15, 2024Observed: 10.66 ft at 4:30AM Apr 15, 2024Observed: 10.69 ft at 4:36AM Apr 15, 2024Observed: 10.72 ft at 4:42AM Apr 15, 2024Observed: 10.73 ft at 4:48AM Apr 15, 2024Observed: 10.74 ft at 4:54AM Apr 15, 2024Observed: 10.75 ft at 5:00AM Apr 15, 2024Observed: 10.72 ft at 5:06AM Apr 15, 2024Observed: 10.75 ft at 5:12AM Apr 15, 2024Observed: 10.72 ft at 5:18AM Apr 15, 2024Observed: 10.72 ft at 5:24AM Apr 15, 2024Observed: 10.62 ft at 5:30AM Apr 15, 2024Observed: 10.55 ft at 5:36AM Apr 15, 2024Observed: 10.45 ft at 5:42AM Apr 15, 2024Observed: 10.35 ft at 5:48AM Apr 15, 2024Observed: 10.23 ft at 5:54AM Apr 15, 2024Observed: 10.09 ft at 6:00AM Apr 15, 2024Observed: 9.98 ft at 6:06AM Apr 15, 2024Observed: 9.84 ft at 6:12AM Apr 15, 2024Observed: 9.72 ft at 6:18AM Apr 15, 2024Observed: 9.64 ft at 6:24AM Apr 15, 2024Observed: 9.5 ft at 6:30AM Apr 15, 2024Observed: 9.37 ft at 6:36AM Apr 15, 2024Observed: 9.23 ft at 6:42AM Apr 15, 2024Observed: 9.09 ft at 6:48AM Apr 15, 2024Observed: 8.96 ft at 6:54AM Apr 15, 2024Observed: 8.77 ft at 7:00AM Apr 15, 2024Observed: 8.62 ft at 7:06AM Apr 15, 2024Observed: 8.43 ft at 7:12AM Apr 15, 2024Observed: 8.23 ft at 7:18AM Apr 15, 2024Observed: 8.05 ft at 7:24AM Apr 15, 2024Observed: 7.89 ft at 7:30AM Apr 15, 2024Observed: 7.67 ft at 7:36AM Apr 15, 2024Observed: 7.45 ft at 7:42AM Apr 15, 2024Observed: 7.2 ft at 7:48AM Apr 15, 2024Observed: 7 ft at 7:54AM Apr 15, 2024Observed: 6.78 ft at 8:00AM Apr 15, 2024Observed: 6.59 ft at 8:06AM Apr 15, 2024Observed: 6.37 ft at 8:12AM Apr 15, 2024Observed: 6.17 ft at 8:18AM Apr 15, 2024Observed: 5.92 ft at 8:24AM Apr 15, 2024Observed: 5.71 ft at 8:30AM Apr 15, 2024Observed: 5.52 ft at 8:36AM Apr 15, 2024Observed: 5.3 ft at 8:42AM Apr 15, 2024Observed: 5.08 ft at 8:48AM Apr 15, 2024Observed: 4.92 ft at 8:54AM Apr 15, 2024Observed: 4.73 ft at 9:00AM Apr 15, 2024Observed: 4.49 ft at 9:06AM Apr 15, 2024Observed: 4.35 ft at 9:12AM Apr 15, 2024Observed: 4.16 ft at 9:18AM Apr 15, 2024Observed: 3.97 ft at 9:24AM Apr 15, 2024Observed: 3.78 ft at 9:30AM Apr 15, 2024Observed: 3.59 ft at 9:36AM Apr 15, 2024Observed: 3.37 ft at 9:42AM Apr 15, 2024Observed: 3.11 ft at 9:48AM Apr 15, 2024Observed: 2.88 ft at 9:54AM Apr 15, 2024Observed: 2.64 ft at 10:00AM Apr 15, 2024Observed: 2.47 ft at 10:06AM Apr 15, 2024Observed: 2.26 ft at 10:12AM Apr 15, 2024Observed: 2.16 ft at 10:18AM Apr 15, 2024Observed: 2.02 ft at 10:24AM Apr 15, 2024Observed: 1.88 ft at 10:30AM Apr 15, 2024Observed: 1.77 ft at 10:36AM Apr 15, 2024Observed: 1.69 ft at 10:42AM Apr 15, 2024Observed: 1.63 ft at 10:48AM Apr 15, 2024Observed: 1.56 ft at 10:54AM Apr 15, 2024Observed: 1.52 ft at 11:00AM Apr 15, 2024Observed: 1.49 ft at 11:06AM Apr 15, 2024Observed: 1.47 ft at 11:12AM Apr 15, 2024Observed: 1.46 ft at 11:18AM Apr 15, 2024Observed: 1.46 ft at 11:24AM Apr 15, 2024Observed: 1.5 ft at 11:30AM Apr 15, 2024Observed: 1.51 ft at 11:36AM Apr 15, 2024Observed: 1.51 ft at 11:42AM Apr 15, 2024Observed: 1.53 ft at 11:48AM Apr 15, 2024Observed: 1.58 ft at 11:54AM Apr 15, 2024Observed: 1.62 ft at 12:00PM Apr 15, 2024Observed: 1.62 ft at 12:06PM Apr 15, 2024Observed: 1.68 ft at 12:12PM Apr 15, 2024Observed: 1.79 ft at 12:18PM Apr 15, 2024Observed: 1.92 ft at 12:24PM Apr 15, 2024Observed: 2.02 ft at 12:30PM Apr 15, 2024Observed: 2.12 ft at 12:36PM Apr 15, 2024Observed: 2.3 ft at 12:42PM Apr 15, 2024Observed: 2.39 ft at 12:48PM Apr 15, 2024Observed: 2.5 ft at 12:54PM Apr 15, 2024Observed: 2.64 ft at 1:00PM Apr 15, 2024Observed: 2.84 ft at 1:06PM Apr 15, 2024Observed: 2.95 ft at 1:12PM Apr 15, 2024Observed: 3.06 ft at 1:18PM Apr 15, 2024Observed: 3.18 ft at 1:24PM Apr 15, 2024Observed: 3.36 ft at 1:30PM Apr 15, 2024Observed: 3.51 ft at 1:36PM Apr 15, 2024Observed: 3.6 ft at 1:42PM Apr 15, 2024Observed: 3.77 ft at 1:48PM Apr 15, 2024Observed: 3.93 ft at 1:54PM Apr 15, 2024Observed: 4.08 ft at 2:00PM Apr 15, 2024Observed: 4.24 ft at 2:06PM Apr 15, 2024Observed: 4.44 ft at 2:12PM Apr 15, 2024Observed: 4.61 ft at 2:18PM Apr 15, 2024Observed: 4.78 ft at 2:24PM Apr 15, 2024Observed: 5.02 ft at 2:30PM Apr 15, 2024Observed: 5.23 ft at 2:36PM Apr 15, 2024Observed: 5.48 ft at 2:42PM Apr 15, 2024Observed: 5.63 ft at 2:48PM Apr 15, 2024Observed: 5.85 ft at 2:54PM Apr 15, 2024Observed: 6.02 ft at 3:00PM Apr 15, 2024Observed: 6.15 ft at 3:06PM Apr 15, 2024Observed: 6.3 ft at 3:12PM Apr 15, 2024Observed: 6.48 ft at 3:18PM Apr 15, 2024Observed: 6.66 ft at 3:24PM Apr 15, 2024Observed: 6.81 ft at 3:30PM Apr 15, 2024Observed: 7.01 ft at 3:36PM Apr 15, 2024Observed: 7.21 ft at 3:42PM Apr 15, 2024Observed: 7.44 ft at 3:48PM Apr 15, 2024Observed: 7.65 ft at 3:54PM Apr 15, 2024Observed: 7.85 ft at 4:00PM Apr 15, 2024Observed: 7.99 ft at 4:06PM Apr 15, 2024Observed: 8.11 ft at 4:12PM Apr 15, 2024Observed: 8.21 ft at 4:18PM Apr 15, 2024Observed: 8.32 ft at 4:24PM Apr 15, 2024Observed: 8.42 ft at 4:30PM Apr 15, 2024Observed: 8.56 ft at 4:36PM Apr 15, 2024Observed: 8.66 ft at 4:42PM Apr 15, 2024Observed: 8.75 ft at 4:48PM Apr 15, 2024Observed: 8.91 ft at 4:54PM Apr 15, 2024Observed: 9.04 ft at 5:00PM Apr 15, 2024Observed: 9.09 ft at 5:06PM Apr 15, 2024Observed: 9.17 ft at 5:12PM Apr 15, 2024Observed: 9.19 ft at 5:18PM Apr 15, 2024Observed: 9.18 ft at 5:24PM Apr 15, 2024Observed: 9.18 ft at 5:30PM Apr 15, 2024Observed: 9.21 ft at 5:36PM Apr 15, 2024Observed: 9.22 ft at 5:42PM Apr 15, 2024Observed: 9.2 ft at 5:48PM Apr 15, 2024Observed: 9.23 ft at 5:54PM Apr 15, 2024Observed: 9.25 ft at 6:00PM Apr 15, 2024Observed: 9.26 ft at 6:06PM Apr 15, 2024Observed: 9.25 ft at 6:12PM Apr 15, 2024Observed: 9.22 ft at 6:18PM Apr 15, 2024Observed: 9.15 ft at 6:24PM Apr 15, 2024Observed: 9.11 ft at 6:30PM Apr 15, 2024Observed: 9.04 ft at 6:36PM Apr 15, 2024Observed: 8.97 ft at 6:42PM Apr 15, 2024Observed: 8.85 ft at 6:48PM Apr 15, 2024Observed: 8.8 ft at 6:54PM Apr 15, 2024Observed: 8.69 ft at 7:00PM Apr 15, 2024Observed: 8.59 ft at 7:06PM Apr 15, 2024Observed: 8.5 ft at 7:12PM Apr 15, 2024Observed: 8.4 ft at 7:18PM Apr 15, 2024Observed: 8.3 ft at 7:24PM Apr 15, 2024Observed: 8.21 ft at 7:30PM Apr 15, 2024Observed: 8.09 ft at 7:36PM Apr 15, 2024Observed: 8.02 ft at 7:42PM Apr 15, 2024Observed: 7.9 ft at 7:48PM Apr 15, 2024Observed: 7.53 ft at 8:06PM Apr 15, 2024Observed: 7.36 ft at 8:12PM Apr 15, 2024Observed: 7.18 ft at 8:18PM Apr 15, 2024Observed: 7.02 ft at 8:24PM Apr 15, 2024Observed: 6.87 ft at 8:30PM Apr 15, 2024Observed: 6.69 ft at 8:36PM Apr 15, 2024Observed: 6.5 ft at 8:42PM Apr 15, 2024Observed: 6.33 ft at 8:48PM Apr 15, 2024Observed: 6.18 ft at 8:54PM Apr 15, 2024Observed: 6 ft at 9:00PM Apr 15, 2024Observed: 5.84 ft at 9:06PM Apr 15, 2024Observed: 5.63 ft at 9:12PM Apr 15, 2024Observed: 5.41 ft at 9:18PM Apr 15, 2024Observed: 5.2 ft at 9:24PM Apr 15, 2024Observed: 4.99 ft at 9:30PM Apr 15, 2024Observed: 4.8 ft at 9:36PM Apr 15, 2024Observed: 4.62 ft at 9:42PM Apr 15, 2024Observed: 4.44 ft at 9:48PM Apr 15, 2024Observed: 4.24 ft at 9:54PM Apr 15, 2024Observed: 4.13 ft at 10:00PM Apr 15, 2024Observed: 3.99 ft at 10:06PM Apr 15, 2024Observed: 3.87 ft at 10:12PM Apr 15, 2024Observed: 3.7 ft at 10:18PM Apr 15, 2024Observed: 3.56 ft at 10:24PM Apr 15, 2024Observed: 3.41 ft at 10:30PM Apr 15, 2024Observed: 3.26 ft at 10:36PM Apr 15, 2024Observed: 3.16 ft at 10:42PM Apr 15, 2024Observed: 3.02 ft at 10:48PM Apr 15, 2024Observed: 2.95 ft at 10:54PM Apr 15, 2024Observed: 2.84 ft at 11:00PM Apr 15, 2024Observed: 2.78 ft at 11:06PM Apr 15, 2024Observed: 2.7 ft at 11:12PM Apr 15, 2024Observed: 2.67 ft at 11:18PM Apr 15, 2024Observed: 2.62 ft at 11:24PM Apr 15, 2024Observed: 2.55 ft at 11:30PM Apr 15, 2024Observed: 2.53 ft at 11:36PM Apr 15, 2024Observed: 2.49 ft at 11:42PM Apr 15, 2024Observed: 2.47 ft at 11:48PM Apr 15, 2024Observed: 2.49 ft at 11:54PM Apr 15, 2024Observed: 2.47 ft at 12:00AM Apr 16, 2024Observed: 2.54 ft at 12:06AM Apr 16, 2024Observed: 2.62 ft at 12:12AM Apr 16, 2024Observed: 2.68 ft at 12:18AM Apr 16, 2024Observed: 2.79 ft at 12:24AM Apr 16, 2024Observed: 2.87 ft at 12:30AM Apr 16, 2024Observed: 2.98 ft at 12:36AM Apr 16, 2024Observed: 3.08 ft at 12:42AM Apr 16, 2024Observed: 3.15 ft at 12:48AM Apr 16, 2024Observed: 3.33 ft at 12:54AM Apr 16, 2024Observed: 3.44 ft at 1:00AM Apr 16, 2024Observed: 3.54 ft at 1:06AM Apr 16, 2024Observed: 3.64 ft at 1:12AM Apr 16, 2024Observed: 3.75 ft at 1:18AM Apr 16, 2024Observed: 3.87 ft at 1:24AM Apr 16, 2024Observed: 3.95 ft at 1:30AM Apr 16, 2024Observed: 4.06 ft at 1:36AM Apr 16, 2024Observed: 4.2 ft at 1:42AM Apr 16, 2024Observed: 4.3 ft at 1:48AM Apr 16, 2024Observed: 4.44 ft at 1:54AM Apr 16, 2024Observed: 4.61 ft at 2:00AM Apr 16, 2024Observed: 4.84 ft at 2:06AM Apr 16, 2024Observed: 4.99 ft at 2:12AM Apr 16, 2024Observed: 5.16 ft at 2:18AM Apr 16, 2024Observed: 5.39 ft at 2:24AM Apr 16, 2024Observed: 5.54 ft at 2:30AM Apr 16, 2024Observed: 5.68 ft at 2:36AM Apr 16, 2024Observed: 5.83 ft at 2:42AM Apr 16, 2024Observed: 5.98 ft at 2:48AM Apr 16, 2024Observed: 6.12 ft at 2:54AM Apr 16, 2024Observed: 6.25 ft at 3:00AM Apr 16, 2024Observed: 6.44 ft at 3:06AM Apr 16, 2024Observed: 6.66 ft at 3:12AM Apr 16, 2024Observed: 6.87 ft at 3:18AM Apr 16, 2024Observed: 7.07 ft at 3:24AM Apr 16, 2024Observed: 7.31 ft at 3:30AM Apr 16, 2024Observed: 7.54 ft at 3:36AM Apr 16, 2024Observed: 7.73 ft at 3:42AM Apr 16, 2024Observed: 7.89 ft at 3:48AM Apr 16, 2024Observed: 8.05 ft at 3:54AM Apr 16, 2024Observed: 8.15 ft at 4:00AM Apr 16, 2024Observed: 8.28 ft at 4:06AM Apr 16, 2024Observed: 8.47 ft at 4:12AM Apr 16, 2024Observed: 8.59 ft at 4:18AM Apr 16, 2024Observed: 8.77 ft at 4:24AM Apr 16, 2024Observed: 8.96 ft at 4:30AM Apr 16, 2024Observed: 9.13 ft at 4:36AM Apr 16, 2024Observed: 9.27 ft at 4:42AM Apr 16, 2024Observed: 9.42 ft at 4:48AM Apr 16, 2024Observed: 9.55 ft at 4:54AM Apr 16, 2024Observed: 9.65 ft at 5:00AM Apr 16, 2024Observed: 9.71 ft at 5:06AM Apr 16, 2024Observed: 9.81 ft at 5:12AM Apr 16, 2024Observed: 9.86 ft at 5:18AM Apr 16, 2024Observed: 9.91 ft at 5:24AM Apr 16, 2024Observed: 9.98 ft at 5:30AM Apr 16, 2024Observed: 10.07 ft at 5:36AM Apr 16, 2024Observed: 10.15 ft at 5:42AM Apr 16, 2024Observed: 10.15 ft at 5:48AM Apr 16, 2024Observed: 10.19 ft at 5:54AM Apr 16, 2024Observed: 10.19 ft at 6:00AM Apr 16, 2024Observed: 10.23 ft at 6:06AM Apr 16, 2024Observed: 10.23 ft at 6:12AM Apr 16, 2024Observed: 10.22 ft at 6:18AM Apr 16, 2024Observed: 10.18 ft at 6:24AM Apr 16, 2024Observed: 10.12 ft at 6:30AM Apr 16, 2024Observed: 10.06 ft at 6:36AM Apr 16, 2024Observed: 10 ft at 6:42AM Apr 16, 2024Observed: 9.94 ft at 6:48AM Apr 16, 2024Observed: 9.84 ft at 6:54AM Apr 16, 2024Observed: 9.69 ft at 7:00AM Apr 16, 2024Observed: 9.53 ft at 7:06AM Apr 16, 2024Observed: 9.48 ft at 7:12AM Apr 16, 2024Observed: 9.37 ft at 7:18AM Apr 16, 2024Observed: 9.23 ft at 7:24AM Apr 16, 2024Observed: 9.1 ft at 7:30AM Apr 16, 2024Observed: 8.99 ft at 7:36AM Apr 16, 2024Observed: 8.85 ft at 7:42AM Apr 16, 2024Observed: 6.53 ft at 9:06AM Apr 16, 2024Observed: 6.4 ft at 9:12AM Apr 16, 2024Observed: 5.68 ft at 9:36AM Apr 16, 2024Observed: 5.45 ft at 9:42AM Apr 16, 2024Observed: 5.22 ft at 9:48AM Apr 16, 2024Observed: 1.76 ft at 12:12PM Apr 16, 2024Observed: 1.76 ft at 12:18PM Apr 16, 2024Observed: 1.75 ft at 12:48PM Apr 16, 2024Observed: 2.09 ft at 1:24PM Apr 16, 2024Observed: 2.16 ft at 1:30PM Apr 16, 2024Observed: 2.65 ft at 2:06PM Apr 16, 2024Observed: 2.86 ft at 2:12PM Apr 16, 2024Observed: 4.22 ft at 3:12PM Apr 16, 2024Observed: 4.41 ft at 3:18PM Apr 16, 2024Observed: 5.04 ft at 3:42PM Apr 16, 2024Observed: 5.24 ft at 3:48PM Apr 16, 2024Observed: 5.82 ft at 4:06PM Apr 16, 2024Observed: 6.01 ft at 4:12PM Apr 16, 2024Observed: 6.64 ft at 4:36PM Apr 16, 2024Observed: 6.8 ft at 4:42PM Apr 16, 2024Observed: 7.48 ft at 5:06PM Apr 16, 2024Observed: 7.67 ft at 5:12PM Apr 16, 2024Observed: 7.8 ft at 5:18PM Apr 16, 2024Observed: 8.28 ft at 5:42PM Apr 16, 2024Observed: 8.39 ft at 5:48PM Apr 16, 2024Observed: 8.68 ft at 6:06PM Apr 16, 2024Observed: 8.78 ft at 6:12PM Apr 16, 2024Observed: 8.84 ft at 6:18PM Apr 16, 2024Forecast: 8.8 ft 8:00PM Apr 16, 2024Forecast: 7.7 ft 9:00PM Apr 16, 2024Forecast: 6.3 ft 10:00PM Apr 16, 2024Forecast: 4.8 ft 11:00PM Apr 16, 2024Forecast: 3.5 ft 12:00AM Apr 17, 2024Forecast: 3.1 ft 1:00AM Apr 17, 2024Forecast: 3.6 ft 2:00AM Apr 17, 2024Forecast: 4.7 ft 3:00AM Apr 17, 2024Forecast: 6.1 ft 4:00AM Apr 17, 2024Forecast: 7.9 ft 5:00AM Apr 17, 2024Forecast: 9.3 ft 6:00AM Apr 17, 2024Forecast: 9.9 ft 7:00AM Apr 17, 2024Forecast: 9.7 ft 8:00AM Apr 17, 2024Forecast: 8.6 ft 9:00AM Apr 17, 2024Forecast: 7.2 ft 10:00AM Apr 17, 2024Forecast: 5.4 ft 11:00AM Apr 17, 2024Forecast: 3.7 ft 12:00PM Apr 17, 2024Forecast: 2.6 ft 1:00PM Apr 17, 2024Forecast: 2.4 ft 2:00PM Apr 17, 2024Forecast: 3 ft 3:00PM Apr 17, 2024Forecast: 4.2 ft 4:00PM Apr 17, 2024Forecast: 5.8 ft 5:00PM Apr 17, 2024Forecast: 7.6 ft 6:00PM Apr 17, 2024Forecast: 8.8 ft 7:00PM Apr 17, 2024Forecast: 9.2 ft 8:00PM Apr 17, 2024Forecast: 8.9 ft 9:00PM Apr 17, 2024Forecast: 7.8 ft 10:00PM Apr 17, 2024Forecast: 6.4 ft 11:00PM Apr 17, 2024Forecast: 4.7 ft 12:00AM Apr 18, 2024Forecast: 3.4 ft 1:00AM Apr 18, 2024Forecast: 3.1 ft 2:00AM Apr 18, 2024Forecast: 3.5 ft 3:00AM Apr 18, 2024Forecast: 4.6 ft 4:00AM Apr 18, 2024Forecast: 6.2 ft 5:00AM Apr 18, 2024Forecast: 8 ft 6:00AM Apr 18, 2024Forecast: 9.4 ft 7:00AM Apr 18, 2024Forecast: 10 ft 8:00AM Apr 18, 2024Forecast: 9.8 ft 9:00AM Apr 18, 2024Forecast: 8.9 ft 10:00AM Apr 18, 2024Forecast: 7.5 ft 11:00AM Apr 18, 2024Forecast: 5.6 ft 12:00PM Apr 18, 2024Forecast: 3.8 ft 1:00PM Apr 18, 2024Forecast: 2.8 ft 2:00PM Apr 18, 2024Forecast: 2.6 ft 3:00PM Apr 18, 2024Forecast: 3.3 ft 4:00PM Apr 18, 2024Forecast: 4.6 ft 5:00PM Apr 18, 2024Forecast: 6.4 ft 6:00PM Apr 18, 2024Forecast: 8.2 ft 7:00PM Apr 18, 2024Forecast: 9.4 ft 8:00PM Apr 18, 2024Forecast: 9.7 ft 9:00PM Apr 18, 2024Forecast: 9.2 ft 10:00PM Apr 18, 2024Forecast: 8.1 ft 11:00PM Apr 18, 2024Forecast: 6.5 ft 12:00AM Apr 19, 2024Forecast: 4.7 ft 1:00AM Apr 19, 2024Forecast: 3.4 ft 2:00AM Apr 19, 2024Forecast: 3 ft 3:00AM Apr 19, 2024Forecast: 3.5 ft 4:00AM Apr 19, 2024Forecast: 4.6 ft 5:00AM Apr 19, 2024Forecast: 6.3 ft 6:00AM Apr 19, 2024Forecast: 8.2 ft 7:00AM Apr 19, 2024Forecast: 9.6 ft 8:00AM Apr 19, 2024Highest Forecast: 10.2 ft 9:00AM Apr 19, 2024Forecast: 9.9 ft 10:00AM Apr 19, 2024Forecast: 9 ft 11:00AM Apr 19, 2024Forecast: 7.4 ft 12:00PM Apr 19, 2024Forecast: 5.4 ft 1:00PM Apr 19, 2024Forecast: 3.6 ft 2:00PM Apr 19, 2024Forecast: 2.7 ft 3:00PM Apr 19, 2024NOAA Center for Operational Oceanographic Products and ServicesBHBM3(plotting HMIRP) Graph Created (7:30PM Apr 16, 2024)ObservedForecast (issued 4:04PM Apr 16)Latest observed value: 8.84 ft at 6:18 PM EDT 16-Apr-2024. Flood Stage is 12.5 ft
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About this graph
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
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
Boston / Norton Weather Forecast Office
46 Commerce Way
Norton, MA 02766
(508) 622-3250
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Page last modified: 2-Nov-2020 7:30 PM
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