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Boston Harbor at Boston Tide Height (ft)Observed: 7.86 ft at 5:18PM May 19, 2018Observed: 7.69 ft at 5:24PM May 19, 2018Observed: 7.48 ft at 5:30PM May 19, 2018Observed: 7.27 ft at 5:36PM May 19, 2018Observed: 7.05 ft at 5:42PM May 19, 2018Observed: 6.83 ft at 5:48PM May 19, 2018Observed: 6.59 ft at 5:54PM May 19, 2018Observed: 6.37 ft at 6:00PM May 19, 2018Observed: 6.12 ft at 6:06PM May 19, 2018Observed: 5.87 ft at 6:12PM May 19, 2018Observed: 5.61 ft at 6:18PM May 19, 2018Observed: 5.36 ft at 6:24PM May 19, 2018Observed: 5.09 ft at 6:30PM May 19, 2018Observed: 4.82 ft at 6:36PM May 19, 2018Observed: 4.58 ft at 6:42PM May 19, 2018Observed: 4.33 ft at 6:48PM May 19, 2018Observed: 4.09 ft at 6:54PM May 19, 2018Observed: 3.83 ft at 7:00PM May 19, 2018Observed: 3.53 ft at 7:06PM May 19, 2018Observed: 3.26 ft at 7:12PM May 19, 2018Observed: 3.02 ft at 7:18PM May 19, 2018Observed: 2.75 ft at 7:24PM May 19, 2018Observed: 2.48 ft at 7:30PM May 19, 2018Observed: 2.25 ft at 7:36PM May 19, 2018Observed: 2.01 ft at 7:42PM May 19, 2018Observed: 1.8 ft at 7:48PM May 19, 2018Observed: 1.39 ft at 8:00PM May 19, 2018Observed: 1.2 ft at 8:06PM May 19, 2018Observed: 1.05 ft at 8:12PM May 19, 2018Observed: 0.9 ft at 8:18PM May 19, 2018Observed: 0.73 ft at 8:24PM May 19, 2018Observed: 0.6 ft at 8:30PM May 19, 2018Observed: 0.49 ft at 8:36PM May 19, 2018Observed: 0.36 ft at 8:42PM May 19, 2018Observed: 0.26 ft at 8:48PM May 19, 2018Observed: 0.2 ft at 8:54PM May 19, 2018Observed: 0.17 ft at 9:00PM May 19, 2018Observed: 0.1 ft at 9:06PM May 19, 2018Observed: 0.08 ft at 9:12PM May 19, 2018Observed: 0.06 ft at 9:18PM May 19, 2018Observed: 0.06 ft at 9:24PM May 19, 2018Observed: 0.14 ft at 9:30PM May 19, 2018Observed: 0.2 ft at 9:36PM May 19, 2018Observed: 0.3 ft at 9:42PM May 19, 2018Observed: 0.43 ft at 9:48PM May 19, 2018Observed: 0.57 ft at 9:54PM May 19, 2018Observed: 0.73 ft at 10:00PM May 19, 2018Observed: 0.92 ft at 10:06PM May 19, 2018Observed: 1.1 ft at 10:12PM May 19, 2018Observed: 1.28 ft at 10:18PM May 19, 2018Observed: 1.45 ft at 10:24PM May 19, 2018Observed: 1.63 ft at 10:30PM May 19, 2018Observed: 1.85 ft at 10:36PM May 19, 2018Observed: 2.05 ft at 10:42PM May 19, 2018Observed: 2.22 ft at 10:48PM May 19, 2018Observed: 2.41 ft at 10:54PM May 19, 2018Observed: 2.63 ft at 11:00PM May 19, 2018Observed: 2.85 ft at 11:06PM May 19, 2018Observed: 3.06 ft at 11:12PM May 19, 2018Observed: 3.3 ft at 11:18PM May 19, 2018Observed: 3.56 ft at 11:24PM May 19, 2018Observed: 3.8 ft at 11:30PM May 19, 2018Observed: 4.05 ft at 11:36PM May 19, 2018Observed: 4.3 ft at 11:42PM May 19, 2018Observed: 4.52 ft at 11:48PM May 19, 2018Observed: 4.78 ft at 11:54PM May 19, 2018Observed: 5.02 ft at 12:00AM May 20, 2018Observed: 5.31 ft at 12:06AM May 20, 2018Observed: 5.56 ft at 12:12AM May 20, 2018Observed: 5.8 ft at 12:18AM May 20, 2018Observed: 6.04 ft at 12:24AM May 20, 2018Observed: 6.3 ft at 12:30AM May 20, 2018Observed: 6.57 ft at 12:36AM May 20, 2018Observed: 6.85 ft at 12:42AM May 20, 2018Observed: 7.11 ft at 12:48AM May 20, 2018Observed: 7.39 ft at 12:54AM May 20, 2018Observed: 7.7 ft at 1:00AM May 20, 2018Observed: 7.99 ft at 1:06AM May 20, 2018Observed: 8.3 ft at 1:12AM May 20, 2018Observed: 8.59 ft at 1:18AM May 20, 2018Observed: 8.86 ft at 1:24AM May 20, 2018Observed: 9.11 ft at 1:30AM May 20, 2018Observed: 9.36 ft at 1:36AM May 20, 2018Observed: 9.59 ft at 1:42AM May 20, 2018Observed: 9.79 ft at 1:48AM May 20, 2018Observed: 9.98 ft at 1:54AM May 20, 2018Observed: 10.16 ft at 2:00AM May 20, 2018Observed: 10.34 ft at 2:06AM May 20, 2018Observed: 10.52 ft at 2:12AM May 20, 2018Observed: 10.68 ft at 2:18AM May 20, 2018Observed: 10.86 ft at 2:24AM May 20, 2018Observed: 11.01 ft at 2:30AM May 20, 2018Observed: 11.16 ft at 2:36AM May 20, 2018Observed: 11.29 ft at 2:42AM May 20, 2018Observed: 11.41 ft at 2:48AM May 20, 2018Observed: 11.51 ft at 2:54AM May 20, 2018Observed: 11.58 ft at 3:00AM May 20, 2018Observed: 11.63 ft at 3:06AM May 20, 2018Highest Observation: 11.66 ft at 3:12AM May 20, 2018Highest Observation: 11.66 ft at 3:18AM May 20, 2018Observed: 11.65 ft at 3:24AM May 20, 2018Observed: 11.63 ft at 3:30AM May 20, 2018Observed: 11.61 ft at 3:36AM May 20, 2018Observed: 11.59 ft at 3:42AM May 20, 2018Observed: 11.53 ft at 3:48AM May 20, 2018Observed: 11.47 ft at 3:54AM May 20, 2018Observed: 11.43 ft at 4:00AM May 20, 2018Observed: 11.35 ft at 4:06AM May 20, 2018Observed: 11.24 ft at 4:12AM May 20, 2018Observed: 11.13 ft at 4:18AM May 20, 2018Observed: 10.98 ft at 4:24AM May 20, 2018Observed: 10.85 ft at 4:30AM May 20, 2018Observed: 10.7 ft at 4:36AM May 20, 2018Observed: 10.56 ft at 4:42AM May 20, 2018Observed: 10.41 ft at 4:48AM May 20, 2018Observed: 10.22 ft at 4:54AM May 20, 2018Observed: 10.01 ft at 5:00AM May 20, 2018Observed: 9.82 ft at 5:06AM May 20, 2018Observed: 9.62 ft at 5:12AM May 20, 2018Observed: 9.41 ft at 5:18AM May 20, 2018Observed: 9.16 ft at 5:24AM May 20, 2018Observed: 8.91 ft at 5:30AM May 20, 2018Observed: 8.69 ft at 5:36AM May 20, 2018Observed: 8.52 ft at 5:42AM May 20, 2018Observed: 8.3 ft at 5:48AM May 20, 2018Observed: 8.1 ft at 5:54AM May 20, 2018Observed: 7.84 ft at 6:00AM May 20, 2018Observed: 7.62 ft at 6:06AM May 20, 2018Observed: 7.37 ft at 6:12AM May 20, 2018Observed: 7.08 ft at 6:18AM May 20, 2018Observed: 6.8 ft at 6:24AM May 20, 2018Observed: 6.57 ft at 6:30AM May 20, 2018Observed: 6.32 ft at 6:36AM May 20, 2018Observed: 6.04 ft at 6:42AM May 20, 2018Observed: 5.75 ft at 6:48AM May 20, 2018Observed: 5.47 ft at 6:54AM May 20, 2018Observed: 5.17 ft at 7:00AM May 20, 2018Observed: 4.82 ft at 7:06AM May 20, 2018Observed: 4.56 ft at 7:12AM May 20, 2018Observed: 4.31 ft at 7:18AM May 20, 2018Observed: 4 ft at 7:24AM May 20, 2018Observed: 3.69 ft at 7:30AM May 20, 2018Observed: 3.35 ft at 7:36AM May 20, 2018Observed: 3 ft at 7:42AM May 20, 2018Observed: 2.73 ft at 7:48AM May 20, 2018Observed: 2.48 ft at 7:54AM May 20, 2018Observed: 2.25 ft at 8:00AM May 20, 2018Observed: 2 ft at 8:06AM May 20, 2018Observed: 1.74 ft at 8:12AM May 20, 2018Observed: 1.47 ft at 8:18AM May 20, 2018Observed: 1.17 ft at 8:24AM May 20, 2018Observed: 0.92 ft at 8:30AM May 20, 2018Observed: 0.66 ft at 8:36AM May 20, 2018Observed: 0.44 ft at 8:42AM May 20, 2018Observed: 0.29 ft at 8:48AM May 20, 2018Observed: 0.15 ft at 8:54AM May 20, 2018Observed: 0 ft at 9:00AM May 20, 2018Observed: -0.16 ft at 9:06AM May 20, 2018Observed: -0.3 ft at 9:12AM May 20, 2018Observed: -0.41 ft at 9:18AM May 20, 2018Observed: -0.5 ft at 9:24AM May 20, 2018Observed: -0.58 ft at 9:30AM May 20, 2018Observed: -0.63 ft at 9:36AM May 20, 2018Observed: -0.69 ft at 9:42AM May 20, 2018Observed: -0.73 ft at 9:48AM May 20, 2018Observed: -0.73 ft at 9:54AM May 20, 2018Observed: -0.73 ft at 10:00AM May 20, 2018Observed: -0.69 ft at 10:06AM May 20, 2018Observed: -0.65 ft at 10:12AM May 20, 2018Observed: -0.59 ft at 10:18AM May 20, 2018Observed: -0.49 ft at 10:24AM May 20, 2018Observed: -0.39 ft at 10:30AM May 20, 2018Observed: -0.27 ft at 10:36AM May 20, 2018Observed: -0.14 ft at 10:42AM May 20, 2018Observed: 0 ft at 10:48AM May 20, 2018Observed: 0.14 ft at 10:54AM May 20, 2018Observed: 0.26 ft at 11:00AM May 20, 2018Observed: 0.42 ft at 11:06AM May 20, 2018Observed: 0.59 ft at 11:12AM May 20, 2018Observed: 0.77 ft at 11:18AM May 20, 2018Observed: 0.96 ft at 11:24AM May 20, 2018Observed: 1.17 ft at 11:30AM May 20, 2018Observed: 1.38 ft at 11:36AM May 20, 2018Observed: 1.61 ft at 11:42AM May 20, 2018Observed: 1.82 ft at 11:48AM May 20, 2018Observed: 2.01 ft at 11:54AM May 20, 2018Observed: 2.23 ft at 12:00PM May 20, 2018Observed: 2.41 ft at 12:06PM May 20, 2018Observed: 2.61 ft at 12:12PM May 20, 2018Observed: 2.86 ft at 12:18PM May 20, 2018Observed: 3.1 ft at 12:24PM May 20, 2018Observed: 3.39 ft at 12:30PM May 20, 2018Observed: 3.65 ft at 12:36PM May 20, 2018Observed: 3.89 ft at 12:42PM May 20, 2018Observed: 4.13 ft at 12:48PM May 20, 2018Observed: 4.34 ft at 12:54PM May 20, 2018Observed: 4.57 ft at 1:00PM May 20, 2018Observed: 4.8 ft at 1:06PM May 20, 2018Observed: 5.05 ft at 1:12PM May 20, 2018Observed: 5.38 ft at 1:18PM May 20, 2018Observed: 5.69 ft at 1:24PM May 20, 2018Observed: 5.95 ft at 1:30PM May 20, 2018Observed: 6.29 ft at 1:36PM May 20, 2018Observed: 6.57 ft at 1:42PM May 20, 2018Observed: 6.81 ft at 1:48PM May 20, 2018Observed: 7.09 ft at 1:54PM May 20, 2018Observed: 7.39 ft at 2:00PM May 20, 2018Observed: 7.66 ft at 2:06PM May 20, 2018Observed: 7.89 ft at 2:12PM May 20, 2018Observed: 8.16 ft at 2:18PM May 20, 2018Observed: 8.37 ft at 2:24PM May 20, 2018Observed: 8.57 ft at 2:30PM May 20, 2018Observed: 8.75 ft at 2:36PM May 20, 2018Observed: 8.96 ft at 2:42PM May 20, 2018Observed: 9.16 ft at 2:48PM May 20, 2018Observed: 9.33 ft at 2:54PM May 20, 2018Observed: 9.5 ft at 3:00PM May 20, 2018Observed: 9.62 ft at 3:06PM May 20, 2018Observed: 9.76 ft at 3:12PM May 20, 2018Observed: 9.89 ft at 3:18PM May 20, 2018Observed: 9.98 ft at 3:24PM May 20, 2018Observed: 10.09 ft at 3:30PM May 20, 2018Observed: 10.15 ft at 3:36PM May 20, 2018Observed: 10.23 ft at 3:42PM May 20, 2018Observed: 10.28 ft at 3:48PM May 20, 2018Observed: 10.31 ft at 3:54PM May 20, 2018Observed: 10.33 ft at 4:00PM May 20, 2018Observed: 10.33 ft at 4:06PM May 20, 2018Observed: 10.32 ft at 4:12PM May 20, 2018Observed: 10.3 ft at 4:18PM May 20, 2018Observed: 10.24 ft at 4:24PM May 20, 2018Observed: 10.2 ft at 4:30PM May 20, 2018Observed: 10.11 ft at 4:36PM May 20, 2018Observed: 10.05 ft at 4:42PM May 20, 2018Observed: 9.97 ft at 4:48PM May 20, 2018Observed: 9.87 ft at 4:54PM May 20, 2018Observed: 9.78 ft at 5:00PM May 20, 2018Observed: 9.67 ft at 5:06PM May 20, 2018Observed: 9.55 ft at 5:12PM May 20, 2018Observed: 9.47 ft at 5:18PM May 20, 2018Observed: 9.31 ft at 5:24PM May 20, 2018Observed: 9.16 ft at 5:30PM May 20, 2018Observed: 9.02 ft at 5:36PM May 20, 2018Observed: 8.83 ft at 5:42PM May 20, 2018Observed: 8.65 ft at 5:48PM May 20, 2018Observed: 8.5 ft at 5:54PM May 20, 2018Observed: 8.36 ft at 6:00PM May 20, 2018Observed: 8.19 ft at 6:06PM May 20, 2018Observed: 8.02 ft at 6:12PM May 20, 2018Observed: 7.84 ft at 6:18PM May 20, 2018Observed: 7.68 ft at 6:24PM May 20, 2018Observed: 7.48 ft at 6:30PM May 20, 2018Observed: 7.26 ft at 6:36PM May 20, 2018Observed: 7.01 ft at 6:42PM May 20, 2018Observed: 6.77 ft at 6:48PM May 20, 2018Observed: 6.53 ft at 6:54PM May 20, 2018Observed: 6.29 ft at 7:00PM May 20, 2018Observed: 6.06 ft at 7:06PM May 20, 2018Observed: 5.83 ft at 7:12PM May 20, 2018Observed: 5.58 ft at 7:18PM May 20, 2018Observed: 5.34 ft at 7:24PM May 20, 2018Observed: 5.1 ft at 7:30PM May 20, 2018Observed: 4.83 ft at 7:36PM May 20, 2018Observed: 4.59 ft at 7:42PM May 20, 2018Observed: 3.79 ft at 8:00PM May 20, 2018Observed: 3.54 ft at 8:06PM May 20, 2018Observed: 3.3 ft at 8:12PM May 20, 2018Observed: 3.07 ft at 8:18PM May 20, 2018Observed: 2.83 ft at 8:24PM May 20, 2018Observed: 2.6 ft at 8:30PM May 20, 2018Observed: 2.35 ft at 8:36PM May 20, 2018Observed: 2.16 ft at 8:42PM May 20, 2018Observed: 1.97 ft at 8:48PM May 20, 2018Observed: 1.77 ft at 8:54PM May 20, 2018Observed: 1.55 ft at 9:00PM May 20, 2018Observed: 1.35 ft at 9:06PM May 20, 2018Observed: 1.17 ft at 9:12PM May 20, 2018Observed: 0.99 ft at 9:18PM May 20, 2018Observed: 0.85 ft at 9:24PM May 20, 2018Observed: 0.71 ft at 9:30PM May 20, 2018Observed: 0.58 ft at 9:36PM May 20, 2018Observed: 0.47 ft at 9:42PM May 20, 2018Observed: 0.38 ft at 9:48PM May 20, 2018Observed: 0.32 ft at 9:54PM May 20, 2018Observed: 0.26 ft at 10:00PM May 20, 2018Observed: 0.23 ft at 10:06PM May 20, 2018Observed: 0.2 ft at 10:12PM May 20, 2018Observed: 0.21 ft at 10:18PM May 20, 2018Observed: 0.24 ft at 10:24PM May 20, 2018Observed: 0.29 ft at 10:30PM May 20, 2018Observed: 0.36 ft at 10:36PM May 20, 2018Observed: 0.43 ft at 10:42PM May 20, 2018Observed: 0.51 ft at 10:48PM May 20, 2018Observed: 0.62 ft at 10:54PM May 20, 2018Observed: 0.75 ft at 11:00PM May 20, 2018Observed: 0.87 ft at 11:06PM May 20, 2018Observed: 1.03 ft at 11:12PM May 20, 2018Observed: 1.18 ft at 11:18PM May 20, 2018Observed: 1.33 ft at 11:24PM May 20, 2018Observed: 1.53 ft at 11:30PM May 20, 2018Observed: 1.74 ft at 11:36PM May 20, 2018Observed: 1.94 ft at 11:42PM May 20, 2018Observed: 2.13 ft at 11:48PM May 20, 2018Observed: 2.33 ft at 11:54PM May 20, 2018Observed: 2.54 ft at 12:00AM May 21, 2018Observed: 2.74 ft at 12:06AM May 21, 2018Observed: 2.93 ft at 12:12AM May 21, 2018Observed: 3.14 ft at 12:18AM May 21, 2018Observed: 3.36 ft at 12:24AM May 21, 2018Observed: 3.58 ft at 12:30AM May 21, 2018Observed: 3.81 ft at 12:36AM May 21, 2018Observed: 4.04 ft at 12:42AM May 21, 2018Observed: 4.3 ft at 12:48AM May 21, 2018Observed: 4.54 ft at 12:54AM May 21, 2018Observed: 4.8 ft at 1:00AM May 21, 2018Observed: 5.05 ft at 1:06AM May 21, 2018Observed: 5.29 ft at 1:12AM May 21, 2018Observed: 5.57 ft at 1:18AM May 21, 2018Observed: 5.8 ft at 1:24AM May 21, 2018Observed: 6.06 ft at 1:30AM May 21, 2018Observed: 6.32 ft at 1:36AM May 21, 2018Observed: 6.58 ft at 1:42AM May 21, 2018Observed: 6.84 ft at 1:48AM May 21, 2018Observed: 7.13 ft at 1:54AM May 21, 2018Observed: 7.39 ft at 2:00AM May 21, 2018Observed: 7.67 ft at 2:06AM May 21, 2018Observed: 7.93 ft at 2:12AM May 21, 2018Observed: 8.2 ft at 2:18AM May 21, 2018Observed: 8.44 ft at 2:24AM May 21, 2018Observed: 8.69 ft at 2:30AM May 21, 2018Observed: 8.94 ft at 2:36AM May 21, 2018Observed: 9.14 ft at 2:42AM May 21, 2018Observed: 9.35 ft at 2:48AM May 21, 2018Observed: 9.56 ft at 2:54AM May 21, 2018Observed: 9.74 ft at 3:00AM May 21, 2018Observed: 9.93 ft at 3:06AM May 21, 2018Observed: 10.1 ft at 3:12AM May 21, 2018Observed: 10.26 ft at 3:18AM May 21, 2018Observed: 10.4 ft at 3:24AM May 21, 2018Observed: 10.53 ft at 3:30AM May 21, 2018Observed: 10.66 ft at 3:36AM May 21, 2018Observed: 10.77 ft at 3:42AM May 21, 2018Observed: 10.86 ft at 3:48AM May 21, 2018Observed: 10.93 ft at 3:54AM May 21, 2018Observed: 10.97 ft at 4:00AM May 21, 2018Observed: 11.02 ft at 4:06AM May 21, 2018Observed: 11.05 ft at 4:12AM May 21, 2018Observed: 11.06 ft at 4:18AM May 21, 2018Observed: 11.07 ft at 4:24AM May 21, 2018Observed: 11.04 ft at 4:30AM May 21, 2018Observed: 11.01 ft at 4:36AM May 21, 2018Observed: 10.99 ft at 4:42AM May 21, 2018Observed: 10.94 ft at 4:48AM May 21, 2018Observed: 10.88 ft at 4:54AM May 21, 2018Observed: 10.8 ft at 5:00AM May 21, 2018Observed: 10.71 ft at 5:06AM May 21, 2018Observed: 10.63 ft at 5:12AM May 21, 2018Observed: 10.39 ft at 5:24AM May 21, 2018Observed: 10.27 ft at 5:30AM May 21, 2018Observed: 10.14 ft at 5:36AM May 21, 2018Observed: 10 ft at 5:42AM May 21, 2018Observed: 9.87 ft at 5:48AM May 21, 2018Observed: 9.69 ft at 5:54AM May 21, 2018Observed: 9.52 ft at 6:00AM May 21, 2018Observed: 9.35 ft at 6:06AM May 21, 2018Observed: 9.16 ft at 6:12AM May 21, 2018Observed: 8.98 ft at 6:18AM May 21, 2018Observed: 8.78 ft at 6:24AM May 21, 2018Observed: 8.57 ft at 6:30AM May 21, 2018Observed: 8.37 ft at 6:36AM May 21, 2018Observed: 8.17 ft at 6:42AM May 21, 2018Observed: 7.95 ft at 6:48AM May 21, 2018Observed: 7.74 ft at 6:54AM May 21, 2018Observed: 7.49 ft at 7:00AM May 21, 2018Observed: 7.25 ft at 7:06AM May 21, 2018Observed: 7 ft at 7:12AM May 21, 2018Observed: 6.73 ft at 7:18AM May 21, 2018Observed: 6.48 ft at 7:24AM May 21, 2018Observed: 6.22 ft at 7:30AM May 21, 2018Observed: 5.94 ft at 7:36AM May 21, 2018Observed: 5.68 ft at 7:42AM May 21, 2018Observed: 5.39 ft at 7:48AM May 21, 2018Observed: 5.12 ft at 7:54AM May 21, 2018Observed: 4.85 ft at 8:00AM May 21, 2018Observed: 4.61 ft at 8:06AM May 21, 2018Observed: 4.34 ft at 8:12AM May 21, 2018Observed: 4.08 ft at 8:18AM May 21, 2018Observed: 3.85 ft at 8:24AM May 21, 2018Observed: 3.55 ft at 8:30AM May 21, 2018Observed: 3.3 ft at 8:36AM May 21, 2018Observed: 3.04 ft at 8:42AM May 21, 2018Observed: 2.76 ft at 8:48AM May 21, 2018Observed: 2.52 ft at 8:54AM May 21, 2018Observed: 2.3 ft at 9:00AM May 21, 2018Observed: 2.08 ft at 9:06AM May 21, 2018Observed: 1.85 ft at 9:12AM May 21, 2018Observed: 1.58 ft at 9:18AM May 21, 2018Observed: 1.31 ft at 9:24AM May 21, 2018Observed: 1.1 ft at 9:30AM May 21, 2018Observed: 0.91 ft at 9:36AM May 21, 2018Observed: 0.7 ft at 9:42AM May 21, 2018Observed: 0.51 ft at 9:48AM May 21, 2018Observed: 0.32 ft at 9:54AM May 21, 2018Observed: 0.15 ft at 10:00AM May 21, 2018Observed: 0.05 ft at 10:06AM May 21, 2018Observed: -0.05 ft at 10:12AM May 21, 2018Observed: -0.14 ft at 10:18AM May 21, 2018Observed: -0.24 ft at 10:24AM May 21, 2018Observed: -0.32 ft at 10:30AM May 21, 2018Observed: -0.37 ft at 10:36AM May 21, 2018Observed: -0.4 ft at 10:42AM May 21, 2018Observed: -0.43 ft at 10:48AM May 21, 2018Observed: -0.44 ft at 10:54AM May 21, 2018Observed: -0.44 ft at 11:00AM May 21, 2018Observed: -0.4 ft at 11:06AM May 21, 2018Observed: -0.34 ft at 11:12AM May 21, 2018Observed: -0.27 ft at 11:18AM May 21, 2018Observed: -0.17 ft at 11:24AM May 21, 2018Observed: -0.04 ft at 11:30AM May 21, 2018Observed: 0.08 ft at 11:36AM May 21, 2018Observed: 0.2 ft at 11:42AM May 21, 2018Observed: 0.37 ft at 11:48AM May 21, 2018Observed: 0.52 ft at 11:54AM May 21, 2018Observed: 0.67 ft at 12:00PM May 21, 2018Observed: 0.83 ft at 12:06PM May 21, 2018Observed: 0.97 ft at 12:12PM May 21, 2018Observed: 1.16 ft at 12:18PM May 21, 2018Observed: 1.32 ft at 12:24PM May 21, 2018Observed: 1.46 ft at 12:30PM May 21, 2018Observed: 1.61 ft at 12:36PM May 21, 2018Observed: 1.77 ft at 12:42PM May 21, 2018Observed: 1.97 ft at 12:48PM May 21, 2018Observed: 2.14 ft at 12:54PM May 21, 2018Observed: 2.3 ft at 1:00PM May 21, 2018Observed: 2.5 ft at 1:06PM May 21, 2018Observed: 2.71 ft at 1:12PM May 21, 2018Observed: 2.93 ft at 1:18PM May 21, 2018Observed: 3.16 ft at 1:24PM May 21, 2018Observed: 3.42 ft at 1:30PM May 21, 2018Observed: 3.69 ft at 1:36PM May 21, 2018Observed: 3.93 ft at 1:42PM May 21, 2018Observed: 4.18 ft at 1:48PM May 21, 2018Observed: 4.43 ft at 1:54PM May 21, 2018Observed: 4.64 ft at 2:00PM May 21, 2018Observed: 4.9 ft at 2:06PM May 21, 2018Observed: 5.14 ft at 2:12PM May 21, 2018Observed: 5.39 ft at 2:18PM May 21, 2018Observed: 5.69 ft at 2:24PM May 21, 2018Observed: 5.97 ft at 2:30PM May 21, 2018Observed: 6.23 ft at 2:36PM May 21, 2018Observed: 6.51 ft at 2:42PM May 21, 2018Observed: 6.77 ft at 2:48PM May 21, 2018Observed: 7.02 ft at 2:54PM May 21, 2018Observed: 7.25 ft at 3:00PM May 21, 2018Observed: 7.49 ft at 3:06PM May 21, 2018Observed: 7.73 ft at 3:12PM May 21, 2018Observed: 7.95 ft at 3:18PM May 21, 2018Observed: 8.17 ft at 3:24PM May 21, 2018Observed: 8.38 ft at 3:30PM May 21, 2018Observed: 8.58 ft at 3:36PM May 21, 2018Observed: 8.78 ft at 3:42PM May 21, 2018Observed: 8.99 ft at 3:48PM May 21, 2018Observed: 9.2 ft at 3:54PM May 21, 2018Observed: 9.38 ft at 4:00PM May 21, 2018Observed: 9.52 ft at 4:06PM May 21, 2018Observed: 9.67 ft at 4:12PM May 21, 2018Observed: 9.82 ft at 4:18PM May 21, 2018Observed: 9.9 ft at 4:24PM May 21, 2018Observed: 10.01 ft at 4:30PM May 21, 2018Observed: 10.1 ft at 4:36PM May 21, 2018Observed: 10.14 ft at 4:42PM May 21, 2018Observed: 10.18 ft at 4:48PM May 21, 2018Observed: 10.21 ft at 4:54PM May 21, 2018Observed: 10.25 ft at 5:00PM May 21, 2018Observed: 10.25 ft at 5:06PM May 21, 2018Observed: 10.22 ft at 5:12PM May 21, 2018Observed: 10.2 ft at 5:18PM May 21, 2018Observed: 10.16 ft at 5:24PM May 21, 2018Observed: 10.13 ft at 5:30PM May 21, 2018Observed: 10.07 ft at 5:36PM May 21, 2018Observed: 10.01 ft at 5:42PM May 21, 2018Observed: 9.94 ft at 5:48PM May 21, 2018Observed: 9.88 ft at 5:54PM May 21, 2018Observed: 9.82 ft at 6:00PM May 21, 2018Observed: 9.73 ft at 6:06PM May 21, 2018Observed: 9.66 ft at 6:12PM May 21, 2018Observed: 9.54 ft at 6:18PM May 21, 2018Observed: 9.45 ft at 6:24PM May 21, 2018Observed: 9.33 ft at 6:30PM May 21, 2018Observed: 9.21 ft at 6:36PM May 21, 2018Observed: 9.06 ft at 6:42PM May 21, 2018Observed: 8.9 ft at 6:48PM May 21, 2018Observed: 8.75 ft at 6:54PM May 21, 2018Observed: 8.6 ft at 7:00PM May 21, 2018Observed: 8.43 ft at 7:06PM May 21, 2018Observed: 8.25 ft at 7:12PM May 21, 2018Observed: 8.05 ft at 7:18PM May 21, 2018Observed: 7.84 ft at 7:24PM May 21, 2018Observed: 7.62 ft at 7:30PM May 21, 2018Observed: 7.4 ft at 7:36PM May 21, 2018Observed: 7.12 ft at 7:42PM May 21, 2018Observed: 6.91 ft at 7:48PM May 21, 2018Observed: 6.51 ft at 8:00PM May 21, 2018Observed: 6.32 ft at 8:06PM May 21, 2018Observed: 6.13 ft at 8:12PM May 21, 2018Observed: 5.9 ft at 8:18PM May 21, 2018Observed: 5.69 ft at 8:24PM May 21, 2018Observed: 5.44 ft at 8:30PM May 21, 2018Observed: 5.18 ft at 8:36PM May 21, 2018Observed: 4.92 ft at 8:42PM May 21, 2018Observed: 4.68 ft at 8:48PM May 21, 2018Observed: 4.45 ft at 8:54PM May 21, 2018Observed: 4.2 ft at 9:00PM May 21, 2018Observed: 3.97 ft at 9:06PM May 21, 2018Observed: 3.73 ft at 9:12PM May 21, 2018Observed: 3.52 ft at 9:18PM May 21, 2018Observed: 3.3 ft at 9:24PM May 21, 2018Observed: 3.07 ft at 9:30PM May 21, 2018Observed: 2.88 ft at 9:36PM May 21, 2018Observed: 2.66 ft at 9:42PM May 21, 2018Observed: 2.48 ft at 9:48PM May 21, 2018Observed: 2.28 ft at 9:54PM May 21, 2018Observed: 2.08 ft at 10:00PM May 21, 2018Observed: 1.89 ft at 10:06PM May 21, 2018Observed: 1.71 ft at 10:12PM May 21, 2018Observed: 1.52 ft at 10:18PM May 21, 2018Observed: 1.36 ft at 10:24PM May 21, 2018Observed: 1.21 ft at 10:30PM May 21, 2018Observed: 1.06 ft at 10:36PM May 21, 2018Observed: 0.94 ft at 10:42PM May 21, 2018Observed: 0.83 ft at 10:48PM May 21, 2018Observed: 0.72 ft at 10:54PM May 21, 2018Observed: 0.71 ft at 11:00PM May 21, 2018Observed: 0.67 ft at 11:06PM May 21, 2018Observed: 0.64 ft at 11:12PM May 21, 2018Observed: 0.63 ft at 11:18PM May 21, 2018Observed: 0.66 ft at 11:24PM May 21, 2018Observed: 0.72 ft at 11:30PM May 21, 2018Observed: 0.74 ft at 11:36PM May 21, 2018Observed: 0.81 ft at 11:42PM May 21, 2018Observed: 0.9 ft at 11:48PM May 21, 2018Observed: 0.98 ft at 11:54PM May 21, 2018Observed: 1.12 ft at 12:00AM May 22, 2018Observed: 1.27 ft at 12:06AM May 22, 2018Observed: 1.44 ft at 12:12AM May 22, 2018Observed: 1.57 ft at 12:18AM May 22, 2018Observed: 1.74 ft at 12:24AM May 22, 2018Observed: 1.9 ft at 12:30AM May 22, 2018Observed: 2.05 ft at 12:36AM May 22, 2018Observed: 2.24 ft at 12:42AM May 22, 2018Observed: 2.4 ft at 12:48AM May 22, 2018Observed: 2.54 ft at 12:54AM May 22, 2018Observed: 2.71 ft at 1:00AM May 22, 2018Observed: 2.87 ft at 1:06AM May 22, 2018Observed: 3.06 ft at 1:12AM May 22, 2018Observed: 3.27 ft at 1:18AM May 22, 2018Observed: 3.46 ft at 1:24AM May 22, 2018Observed: 3.65 ft at 1:30AM May 22, 2018Observed: 3.86 ft at 1:36AM May 22, 2018Observed: 4.07 ft at 1:42AM May 22, 2018Observed: 4.29 ft at 1:48AM May 22, 2018Observed: 4.52 ft at 1:54AM May 22, 2018Observed: 4.75 ft at 2:00AM May 22, 2018Observed: 5 ft at 2:06AM May 22, 2018Observed: 5.23 ft at 2:12AM May 22, 2018Observed: 5.48 ft at 2:18AM May 22, 2018Observed: 5.72 ft at 2:24AM May 22, 2018Observed: 5.96 ft at 2:30AM May 22, 2018Observed: 6.18 ft at 2:36AM May 22, 2018Observed: 6.41 ft at 2:42AM May 22, 2018Observed: 6.64 ft at 2:48AM May 22, 2018Observed: 6.88 ft at 2:54AM May 22, 2018Observed: 7.12 ft at 3:00AM May 22, 2018Observed: 7.37 ft at 3:06AM May 22, 2018Observed: 7.6 ft at 3:12AM May 22, 2018Observed: 7.84 ft at 3:18AM May 22, 2018Observed: 8.06 ft at 3:24AM May 22, 2018Observed: 8.28 ft at 3:30AM May 22, 2018Observed: 8.49 ft at 3:36AM May 22, 2018Observed: 8.7 ft at 3:42AM May 22, 2018Observed: 8.9 ft at 3:48AM May 22, 2018Observed: 9.09 ft at 3:54AM May 22, 2018Observed: 9.28 ft at 4:00AM May 22, 2018Observed: 9.49 ft at 4:06AM May 22, 2018Observed: 9.69 ft at 4:12AM May 22, 2018Observed: 9.84 ft at 4:18AM May 22, 2018Observed: 10 ft at 4:24AM May 22, 2018Observed: 10.13 ft at 4:30AM May 22, 2018Observed: 10.22 ft at 4:36AM May 22, 2018Observed: 10.34 ft at 4:42AM May 22, 2018Observed: 10.41 ft at 4:48AM May 22, 2018Observed: 10.47 ft at 4:54AM May 22, 2018Observed: 10.54 ft at 5:00AM May 22, 2018Observed: 10.58 ft at 5:06AM May 22, 2018Observed: 10.65 ft at 5:12AM May 22, 2018Observed: 10.69 ft at 5:18AM May 22, 2018Observed: 10.71 ft at 5:24AM May 22, 2018Observed: 10.69 ft at 5:30AM May 22, 2018Observed: 10.65 ft at 5:36AM May 22, 2018Observed: 10.61 ft at 5:42AM May 22, 2018Observed: 10.56 ft at 5:48AM May 22, 2018Observed: 10.48 ft at 5:54AM May 22, 2018Observed: 10.43 ft at 6:00AM May 22, 2018Observed: 10.35 ft at 6:06AM May 22, 2018Observed: 10.3 ft at 6:12AM May 22, 2018Observed: 10.21 ft at 6:18AM May 22, 2018Observed: 10.13 ft at 6:24AM May 22, 2018Observed: 10 ft at 6:30AM May 22, 2018Observed: 9.9 ft at 6:36AM May 22, 2018Observed: 9.74 ft at 6:42AM May 22, 2018Observed: 9.57 ft at 6:48AM May 22, 2018Observed: 9.43 ft at 6:54AM May 22, 2018Observed: 9.25 ft at 7:00AM May 22, 2018Observed: 9.08 ft at 7:06AM May 22, 2018Observed: 8.93 ft at 7:12AM May 22, 2018Observed: 8.77 ft at 7:18AM May 22, 2018Observed: 8.58 ft at 7:24AM May 22, 2018Observed: 8.42 ft at 7:30AM May 22, 2018Observed: 8.22 ft at 7:36AM May 22, 2018Observed: 8.01 ft at 7:42AM May 22, 2018Observed: 7.78 ft at 7:48AM May 22, 2018Observed: 7.54 ft at 7:54AM May 22, 2018Observed: 7.33 ft at 8:00AM May 22, 2018Observed: 7.09 ft at 8:06AM May 22, 2018Observed: 6.87 ft at 8:12AM May 22, 2018Observed: 6.64 ft at 8:18AM May 22, 2018Observed: 6.46 ft at 8:24AM May 22, 2018Observed: 6.26 ft at 8:30AM May 22, 2018Observed: 6.06 ft at 8:36AM May 22, 2018Observed: 5.84 ft at 8:42AM May 22, 2018Observed: 5.58 ft at 8:48AM May 22, 2018Observed: 5.33 ft at 8:54AM May 22, 2018Observed: 5.08 ft at 9:00AM May 22, 2018Observed: 4.81 ft at 9:06AM May 22, 2018Observed: 4.54 ft at 9:12AM May 22, 2018Observed: 4.3 ft at 9:18AM May 22, 2018Observed: 4.05 ft at 9:24AM May 22, 2018Observed: 3.79 ft at 9:30AM May 22, 2018Observed: 3.5 ft at 9:36AM May 22, 2018Observed: 3.28 ft at 9:42AM May 22, 2018Observed: 3.05 ft at 9:48AM May 22, 2018Observed: 2.81 ft at 9:54AM May 22, 2018Observed: 2.58 ft at 10:00AM May 22, 2018Observed: 2.37 ft at 10:06AM May 22, 2018Observed: 2.11 ft at 10:12AM May 22, 2018Observed: 1.89 ft at 10:18AM May 22, 2018Observed: 1.7 ft at 10:24AM May 22, 2018Observed: 1.45 ft at 10:30AM May 22, 2018Observed: 1.25 ft at 10:36AM May 22, 2018Observed: 1.06 ft at 10:42AM May 22, 2018Observed: 0.88 ft at 10:48AM May 22, 2018Observed: 0.71 ft at 10:54AM May 22, 2018Observed: 0.55 ft at 11:00AM May 22, 2018Observed: 0.37 ft at 11:06AM May 22, 2018Observed: 0.27 ft at 11:12AM May 22, 2018Observed: 0.18 ft at 11:18AM May 22, 2018Observed: 0.1 ft at 11:24AM May 22, 2018Observed: 0.02 ft at 11:30AM May 22, 2018Observed: 0 ft at 11:36AM May 22, 2018Observed: -0.02 ft at 11:42AM May 22, 2018Observed: -0.02 ft at 11:48AM May 22, 2018Observed: 0.01 ft at 11:54AM May 22, 2018Observed: 0.02 ft at 12:00PM May 22, 2018Observed: 0.08 ft at 12:06PM May 22, 2018Observed: 0.14 ft at 12:12PM May 22, 2018Observed: 0.18 ft at 12:18PM May 22, 2018Observed: 0.25 ft at 12:24PM May 22, 2018Observed: 0.34 ft at 12:30PM May 22, 2018Observed: 0.42 ft at 12:36PM May 22, 2018Observed: 0.5 ft at 12:42PM May 22, 2018Observed: 0.65 ft at 12:48PM May 22, 2018Observed: 0.78 ft at 12:54PM May 22, 2018Observed: 0.9 ft at 1:00PM May 22, 2018Observed: 1.05 ft at 1:06PM May 22, 2018Observed: 1.18 ft at 1:12PM May 22, 2018Observed: 1.37 ft at 1:18PM May 22, 2018Observed: 1.55 ft at 1:24PM May 22, 2018Observed: 1.74 ft at 1:30PM May 22, 2018Observed: 1.94 ft at 1:36PM May 22, 2018Observed: 2.14 ft at 1:42PM May 22, 2018Observed: 2.34 ft at 1:48PM May 22, 2018Observed: 2.52 ft at 1:54PM May 22, 2018Observed: 2.72 ft at 2:00PM May 22, 2018Observed: 2.93 ft at 2:06PM May 22, 2018Observed: 3.1 ft at 2:12PM May 22, 2018Observed: 3.29 ft at 2:18PM May 22, 2018Observed: 3.5 ft at 2:24PM May 22, 2018Observed: 3.75 ft at 2:30PM May 22, 2018Observed: 3.93 ft at 2:36PM May 22, 2018Observed: 4.14 ft at 2:42PM May 22, 2018Observed: 4.4 ft at 2:48PM May 22, 2018Observed: 4.61 ft at 2:54PM May 22, 2018Observed: 4.88 ft at 3:00PM May 22, 2018Observed: 5.14 ft at 3:06PM May 22, 2018Observed: 5.39 ft at 3:12PM May 22, 2018Observed: 5.62 ft at 3:18PM May 22, 2018Observed: 5.9 ft at 3:24PM May 22, 2018Observed: 6.15 ft at 3:30PM May 22, 2018Observed: 6.42 ft at 3:36PM May 22, 2018Observed: 6.67 ft at 3:42PM May 22, 2018Observed: 6.94 ft at 3:48PM May 22, 2018Observed: 7.19 ft at 3:54PM May 22, 2018Observed: 7.43 ft at 4:00PM May 22, 2018Observed: 7.67 ft at 4:06PM May 22, 2018Observed: 7.9 ft at 4:12PM May 22, 2018Observed: 8.14 ft at 4:18PM May 22, 2018Observed: 8.35 ft at 4:24PM May 22, 2018Observed: 8.58 ft at 4:30PM May 22, 2018Observed: 8.73 ft at 4:36PM May 22, 2018Observed: 8.91 ft at 4:42PM May 22, 2018Forecast: 9.8 ft 6:00PM May 22, 2018Forecast: 9.6 ft 7:00PM May 22, 2018Forecast: 8.4 ft 8:00PM May 22, 2018Forecast: 6.6 ft 9:00PM May 22, 2018Forecast: 4.3 ft 10:00PM May 22, 2018Forecast: 2.1 ft 11:00PM May 22, 2018Forecast: 0.6 ft 12:00AM May 23, 2018Forecast: 0.9 ft 1:00AM May 23, 2018Forecast: 2.1 ft 2:00AM May 23, 2018Forecast: 4 ft 3:00AM May 23, 2018Forecast: 6.2 ft 4:00AM May 23, 2018Forecast: 8.4 ft 5:00AM May 23, 2018Forecast: 9.8 ft 6:00AM May 23, 2018Highest Forecast: 10.1 ft 7:00AM May 23, 2018Forecast: 9.2 ft 8:00AM May 23, 2018Forecast: 7.5 ft 9:00AM May 23, 2018Forecast: 5.3 ft 10:00AM May 23, 2018Forecast: 2.8 ft 11:00AM May 23, 2018Forecast: 0.8 ft 12:00PM May 23, 2018Forecast: 0 ft 1:00PM May 23, 2018Forecast: 0.7 ft 2:00PM May 23, 2018Forecast: 2.2 ft 3:00PM May 23, 2018Forecast: 4.2 ft 4:00PM May 23, 2018Forecast: 6.7 ft 5:00PM May 23, 2018Forecast: 8.8 ft 6:00PM May 23, 2018Forecast: 9.9 ft 7:00PM May 23, 2018Forecast: 9.7 ft 8:00PM May 23, 2018Forecast: 8.6 ft 9:00PM May 23, 2018Forecast: 6.8 ft 10:00PM May 23, 2018Forecast: 4.5 ft 11:00PM May 23, 2018Forecast: 2.2 ft 12:00AM May 24, 2018Forecast: 0.7 ft 1:00AM May 24, 2018Forecast: 0.7 ft 2:00AM May 24, 2018Forecast: 1.8 ft 3:00AM May 24, 2018Forecast: 3.6 ft 4:00AM May 24, 2018Forecast: 5.8 ft 5:00AM May 24, 2018Forecast: 8.1 ft 6:00AM May 24, 2018Forecast: 9.5 ft 7:00AM May 24, 2018Forecast: 9.9 ft 8:00AM May 24, 2018Forecast: 9.1 ft 9:00AM May 24, 2018Forecast: 7.5 ft 10:00AM May 24, 2018Forecast: 5.4 ft 11:00AM May 24, 2018Forecast: 2.9 ft 12:00PM May 24, 2018Forecast: 0.9 ft 1:00PM May 24, 2018Forecast: 0.2 ft 2:00PM May 24, 2018Forecast: 0.8 ft 3:00PM May 24, 2018Forecast: 2.3 ft 4:00PM May 24, 2018Forecast: 4.4 ft 5:00PM May 24, 2018Forecast: 6.9 ft 6:00PM May 24, 2018Forecast: 9 ft 7:00PM May 24, 2018Highest Forecast: 10.1 ft 8:00PM May 24, 2018Forecast: 9.9 ft 9:00PM May 24, 2018Forecast: 8.8 ft 10:00PM May 24, 2018Forecast: 6.9 ft 11:00PM May 24, 2018Forecast: 4.5 ft 12:00AM May 25, 2018Forecast: 2.1 ft 1:00AM May 25, 2018Forecast: 0.6 ft 2:00AM May 25, 2018Forecast: 0.4 ft 3:00AM May 25, 2018NOAA Center for Operational Oceanographic Products and ServicesBHBM3(plotting HMIRG) Graph Created (5:15PM May 22, 2018)ObservedForecast (issued 4:18AM May 22)Latest observed value: 8.91 ft at 4:42 PM EDT 22-May-2018. 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: Coastal flood impacts are dependent upon waves as well as tide level. High waves can result in flooding even if the tide level is below flood stage.

NOTE: Forecasts for the Boston Harbor at Boston are issued routinely year-round.

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

Return to Area Map
Flood Categories (in feet)
Major Flood Stage: 16
Moderate Flood Stage: 14.5
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) 14.20 ft on 01/02/1987
(5) 14.14 ft on 10/30/1991
(6) 14.04 ft on 01/24/1979
(7) 14.03 ft on 12/12/1992
(8) 13.87 ft on 03/03/2018
(9) 13.84 ft on 12/29/1959
(10) 13.84 ft on 01/03/2014
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 13.87 ft on 03/03/2018
(2) 14.67 ft on 03/02/2018
(3) 13.24 ft on 01/30/2018
(4) 15.16 ft on 01/04/2018
(5) 13.10 ft on 05/28/2017
(6) 13.41 ft on 05/26/2017
(7) 13.62 ft on 01/27/2015
(8) 13.84 ft on 01/03/2014
(9) 13.58 ft on 06/05/2012
(10) 13.48 ft on 06/04/2012
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 rarely seen. Major widespread coastal flooding is expected. Numerous homes and roadways will be flooded from Revere and Winthrop southward thru Hull, including major flooding within the Boston Seaport District. Impacts will occur during several hours before and after high tide. People living in vulnerable coastal areas must take action to protect life and property.
14.5 Significant flooding of low lying coastal locations is expected from Revere and Winthrop southward through Hull. This includes significant flooding within the Seaport District of Boston. Numerous homes will be flooded. Road closures and evacuations of coastal sections are likely. Large swells and wave action will produce significant beach erosion.
14 Flooding of low lying coastal locations is expected from Revere and Winthrop southward through Hull. Road closures and some evacuations of coastal sections may be required. Large swells and wave action will produce minor to moderate beach erosion.
13.5 Minor flooding of low lying coastal locations is expected from Revere and Winthrop southward through Hull. The combination of high tides and large swells will result in washover onto coastal roadways and some road closures may occur around the time of high tide.
12.5 Minor coastal flooding occurs along 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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