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Hydrograph River at a Glance Download
Boston Harbor at Boston (IN MLLW) Tide Height (ft)Observed: 9.55 ft at 3:36AM Jul 30, 2021Observed: 9.64 ft at 3:42AM Jul 30, 2021Observed: 9.75 ft at 3:48AM Jul 30, 2021Observed: 9.9 ft at 3:54AM Jul 30, 2021Observed: 9.98 ft at 4:00AM Jul 30, 2021Observed: 10.08 ft at 4:06AM Jul 30, 2021Observed: 10.1 ft at 4:12AM Jul 30, 2021Observed: 10.16 ft at 4:18AM Jul 30, 2021Observed: 10.2 ft at 4:24AM Jul 30, 2021Observed: 10.26 ft at 4:30AM Jul 30, 2021Highest Observation: 10.3 ft at 4:36AM Jul 30, 2021Observed: 10.27 ft at 4:42AM Jul 30, 2021Observed: 10.2 ft at 4:48AM Jul 30, 2021Observed: 10.15 ft at 4:54AM Jul 30, 2021Observed: 10.12 ft at 5:00AM Jul 30, 2021Observed: 10.06 ft at 5:06AM Jul 30, 2021Observed: 9.98 ft at 5:12AM Jul 30, 2021Observed: 9.85 ft at 5:18AM Jul 30, 2021Observed: 9.75 ft at 5:24AM Jul 30, 2021Observed: 9.65 ft at 5:30AM Jul 30, 2021Observed: 9.6 ft at 5:36AM Jul 30, 2021Observed: 9.52 ft at 5:42AM Jul 30, 2021Observed: 9.45 ft at 5:48AM Jul 30, 2021Observed: 9.31 ft at 5:54AM Jul 30, 2021Observed: 9.18 ft at 6:00AM Jul 30, 2021Observed: 9.04 ft at 6:06AM Jul 30, 2021Observed: 8.91 ft at 6:12AM Jul 30, 2021Observed: 8.76 ft at 6:18AM Jul 30, 2021Observed: 8.57 ft at 6:24AM Jul 30, 2021Observed: 8.39 ft at 6:30AM Jul 30, 2021Observed: 8.23 ft at 6:36AM Jul 30, 2021Observed: 8.09 ft at 6:42AM Jul 30, 2021Observed: 7.96 ft at 6:48AM Jul 30, 2021Observed: 7.81 ft at 6:54AM Jul 30, 2021Observed: 7.63 ft at 7:00AM Jul 30, 2021Observed: 7.45 ft at 7:06AM Jul 30, 2021Observed: 7.25 ft at 7:12AM Jul 30, 2021Observed: 7.09 ft at 7:18AM Jul 30, 2021Observed: 6.91 ft at 7:24AM Jul 30, 2021Observed: 6.68 ft at 7:30AM Jul 30, 2021Observed: 6.48 ft at 7:36AM Jul 30, 2021Observed: 6.27 ft at 7:42AM Jul 30, 2021Observed: 6.05 ft at 7:48AM Jul 30, 2021Observed: 5.83 ft at 7:54AM Jul 30, 2021Observed: 5.63 ft at 8:00AM Jul 30, 2021Observed: 5.38 ft at 8:06AM Jul 30, 2021Observed: 5.15 ft at 8:12AM Jul 30, 2021Observed: 4.95 ft at 8:18AM Jul 30, 2021Observed: 4.75 ft at 8:24AM Jul 30, 2021Observed: 4.55 ft at 8:30AM Jul 30, 2021Observed: 4.36 ft at 8:36AM Jul 30, 2021Observed: 4.18 ft at 8:42AM Jul 30, 2021Observed: 3.99 ft at 8:48AM Jul 30, 2021Observed: 3.79 ft at 8:54AM Jul 30, 2021Observed: 3.58 ft at 9:00AM Jul 30, 2021Observed: 3.4 ft at 9:06AM Jul 30, 2021Observed: 3.17 ft at 9:12AM Jul 30, 2021Observed: 3 ft at 9:18AM Jul 30, 2021Observed: 2.86 ft at 9:24AM Jul 30, 2021Observed: 2.73 ft at 9:30AM Jul 30, 2021Observed: 2.61 ft at 9:36AM Jul 30, 2021Observed: 2.49 ft at 9:42AM Jul 30, 2021Observed: 2.41 ft at 9:48AM Jul 30, 2021Observed: 2.33 ft at 9:54AM Jul 30, 2021Observed: 2.19 ft at 10:00AM Jul 30, 2021Observed: 2.09 ft at 10:06AM Jul 30, 2021Observed: 1.98 ft at 10:12AM Jul 30, 2021Observed: 1.86 ft at 10:18AM Jul 30, 2021Observed: 1.74 ft at 10:24AM Jul 30, 2021Observed: 1.64 ft at 10:30AM Jul 30, 2021Observed: 1.59 ft at 10:36AM Jul 30, 2021Observed: 1.54 ft at 10:42AM Jul 30, 2021Observed: 1.54 ft at 10:48AM Jul 30, 2021Observed: 1.58 ft at 10:54AM Jul 30, 2021Observed: 1.64 ft at 11:00AM Jul 30, 2021Observed: 1.73 ft at 11:06AM Jul 30, 2021Observed: 1.82 ft at 11:12AM Jul 30, 2021Observed: 1.93 ft at 11:18AM Jul 30, 2021Observed: 2.03 ft at 11:24AM Jul 30, 2021Observed: 2.13 ft at 11:30AM Jul 30, 2021Observed: 2.21 ft at 11:36AM Jul 30, 2021Observed: 2.28 ft at 11:42AM Jul 30, 2021Observed: 2.36 ft at 11:48AM Jul 30, 2021Observed: 2.44 ft at 11:54AM Jul 30, 2021Observed: 2.5 ft at 12:00PM Jul 30, 2021Observed: 2.59 ft at 12:06PM Jul 30, 2021Observed: 2.68 ft at 12:12PM Jul 30, 2021Observed: 2.76 ft at 12:18PM Jul 30, 2021Observed: 2.92 ft at 12:24PM Jul 30, 2021Observed: 3.09 ft at 12:30PM Jul 30, 2021Observed: 3.25 ft at 12:36PM Jul 30, 2021Observed: 3.44 ft at 12:42PM Jul 30, 2021Observed: 3.64 ft at 12:48PM Jul 30, 2021Observed: 3.83 ft at 12:54PM Jul 30, 2021Observed: 4.02 ft at 1:00PM Jul 30, 2021Observed: 4.18 ft at 1:06PM Jul 30, 2021Observed: 4.36 ft at 1:12PM Jul 30, 2021Observed: 4.5 ft at 1:18PM Jul 30, 2021Observed: 4.63 ft at 1:24PM Jul 30, 2021Observed: 4.78 ft at 1:30PM Jul 30, 2021Observed: 5 ft at 1:36PM Jul 30, 2021Observed: 5.16 ft at 1:42PM Jul 30, 2021Observed: 5.35 ft at 1:48PM Jul 30, 2021Observed: 5.55 ft at 1:54PM Jul 30, 2021Observed: 5.78 ft at 2:00PM Jul 30, 2021Observed: 6.02 ft at 2:06PM Jul 30, 2021Observed: 6.26 ft at 2:12PM Jul 30, 2021Observed: 6.43 ft at 2:18PM Jul 30, 2021Observed: 6.6 ft at 2:24PM Jul 30, 2021Observed: 6.8 ft at 2:30PM Jul 30, 2021Observed: 7.02 ft at 2:36PM Jul 30, 2021Observed: 7.25 ft at 2:42PM Jul 30, 2021Observed: 7.43 ft at 2:48PM Jul 30, 2021Observed: 7.61 ft at 2:54PM Jul 30, 2021Observed: 7.78 ft at 3:00PM Jul 30, 2021Observed: 8 ft at 3:06PM Jul 30, 2021Observed: 8.17 ft at 3:12PM Jul 30, 2021Observed: 8.35 ft at 3:18PM Jul 30, 2021Observed: 8.55 ft at 3:24PM Jul 30, 2021Observed: 8.73 ft at 3:30PM Jul 30, 2021Observed: 8.87 ft at 3:36PM Jul 30, 2021Observed: 9.04 ft at 3:42PM Jul 30, 2021Observed: 9.15 ft at 3:48PM Jul 30, 2021Observed: 9.24 ft at 3:54PM Jul 30, 2021Observed: 9.34 ft at 4:00PM Jul 30, 2021Observed: 9.41 ft at 4:06PM Jul 30, 2021Observed: 9.51 ft at 4:12PM Jul 30, 2021Observed: 9.59 ft at 4:18PM Jul 30, 2021Observed: 9.67 ft at 4:24PM Jul 30, 2021Observed: 9.73 ft at 4:30PM Jul 30, 2021Observed: 9.83 ft at 4:36PM Jul 30, 2021Observed: 9.88 ft at 4:42PM Jul 30, 2021Observed: 9.92 ft at 4:48PM Jul 30, 2021Observed: 9.95 ft at 4:54PM Jul 30, 2021Observed: 9.95 ft at 5:00PM Jul 30, 2021Observed: 9.95 ft at 5:06PM Jul 30, 2021Observed: 9.94 ft at 5:12PM Jul 30, 2021Observed: 9.92 ft at 5:18PM Jul 30, 2021Observed: 9.93 ft at 5:24PM Jul 30, 2021Observed: 9.89 ft at 5:30PM Jul 30, 2021Observed: 9.87 ft at 5:36PM Jul 30, 2021Observed: 9.86 ft at 5:42PM Jul 30, 2021Observed: 9.82 ft at 5:48PM Jul 30, 2021Observed: 9.74 ft at 5:54PM Jul 30, 2021Observed: 9.59 ft at 6:00PM Jul 30, 2021Observed: 9.48 ft at 6:06PM Jul 30, 2021Observed: 9.34 ft at 6:12PM Jul 30, 2021Observed: 9.18 ft at 6:18PM Jul 30, 2021Observed: 9.05 ft at 6:24PM Jul 30, 2021Observed: 8.87 ft at 6:30PM Jul 30, 2021Observed: 8.71 ft at 6:36PM Jul 30, 2021Observed: 8.59 ft at 6:42PM Jul 30, 2021Observed: 8.45 ft at 6:48PM Jul 30, 2021Observed: 8.34 ft at 6:54PM Jul 30, 2021Observed: 8.24 ft at 7:00PM Jul 30, 2021Observed: 8.09 ft at 7:06PM Jul 30, 2021Observed: 7.95 ft at 7:12PM Jul 30, 2021Observed: 7.83 ft at 7:18PM Jul 30, 2021Observed: 7.68 ft at 7:24PM Jul 30, 2021Observed: 7.51 ft at 7:30PM Jul 30, 2021Observed: 7.33 ft at 7:36PM Jul 30, 2021Observed: 7.14 ft at 7:42PM Jul 30, 2021Observed: 6.94 ft at 7:48PM Jul 30, 2021Observed: 6.39 ft at 8:06PM Jul 30, 2021Observed: 6.21 ft at 8:12PM Jul 30, 2021Observed: 6.01 ft at 8:18PM Jul 30, 2021Observed: 5.81 ft at 8:24PM Jul 30, 2021Observed: 5.61 ft at 8:30PM Jul 30, 2021Observed: 5.4 ft at 8:36PM Jul 30, 2021Observed: 5.23 ft at 8:42PM Jul 30, 2021Observed: 5.04 ft at 8:48PM Jul 30, 2021Observed: 4.85 ft at 8:54PM Jul 30, 2021Observed: 4.67 ft at 9:00PM Jul 30, 2021Observed: 4.5 ft at 9:06PM Jul 30, 2021Observed: 4.32 ft at 9:12PM Jul 30, 2021Observed: 4.14 ft at 9:18PM Jul 30, 2021Observed: 3.98 ft at 9:24PM Jul 30, 2021Observed: 3.79 ft at 9:30PM Jul 30, 2021Observed: 3.58 ft at 9:36PM Jul 30, 2021Observed: 3.37 ft at 9:42PM Jul 30, 2021Observed: 3.2 ft at 9:48PM Jul 30, 2021Observed: 3.01 ft at 9:54PM Jul 30, 2021Observed: 2.83 ft at 10:00PM Jul 30, 2021Observed: 2.68 ft at 10:06PM Jul 30, 2021Observed: 2.55 ft at 10:12PM Jul 30, 2021Observed: 2.44 ft at 10:18PM Jul 30, 2021Observed: 2.35 ft at 10:24PM Jul 30, 2021Observed: 2.28 ft at 10:30PM Jul 30, 2021Observed: 2.2 ft at 10:36PM Jul 30, 2021Observed: 2.12 ft at 10:42PM Jul 30, 2021Observed: 2.06 ft at 10:48PM Jul 30, 2021Observed: 2.03 ft at 10:54PM Jul 30, 2021Observed: 1.95 ft at 11:00PM Jul 30, 2021Observed: 1.92 ft at 11:06PM Jul 30, 2021Observed: 1.88 ft at 11:12PM Jul 30, 2021Observed: 1.88 ft at 11:18PM Jul 30, 2021Observed: 1.9 ft at 11:24PM Jul 30, 2021Observed: 1.88 ft at 11:30PM Jul 30, 2021Observed: 1.9 ft at 11:36PM Jul 30, 2021Observed: 1.92 ft at 11:42PM Jul 30, 2021Observed: 1.98 ft at 11:48PM Jul 30, 2021Observed: 2.03 ft at 11:54PM Jul 30, 2021Observed: 2.11 ft at 12:00AM Jul 31, 2021Observed: 2.19 ft at 12:06AM Jul 31, 2021Observed: 2.28 ft at 12:12AM Jul 31, 2021Observed: 2.42 ft at 12:18AM Jul 31, 2021Observed: 2.52 ft at 12:24AM Jul 31, 2021Observed: 2.68 ft at 12:30AM Jul 31, 2021Observed: 2.79 ft at 12:36AM Jul 31, 2021Observed: 2.93 ft at 12:42AM Jul 31, 2021Observed: 3.05 ft at 12:48AM Jul 31, 2021Observed: 3.17 ft at 12:54AM Jul 31, 2021Observed: 3.28 ft at 1:00AM Jul 31, 2021Observed: 3.39 ft at 1:06AM Jul 31, 2021Observed: 3.52 ft at 1:12AM Jul 31, 2021Observed: 3.63 ft at 1:18AM Jul 31, 2021Observed: 3.78 ft at 1:24AM Jul 31, 2021Observed: 3.93 ft at 1:30AM Jul 31, 2021Observed: 4.09 ft at 1:36AM Jul 31, 2021Observed: 4.26 ft at 1:42AM Jul 31, 2021Observed: 4.42 ft at 1:48AM Jul 31, 2021Observed: 4.62 ft at 1:54AM Jul 31, 2021Observed: 4.79 ft at 2:00AM Jul 31, 2021Observed: 4.96 ft at 2:06AM Jul 31, 2021Observed: 5.13 ft at 2:12AM Jul 31, 2021Observed: 5.3 ft at 2:18AM Jul 31, 2021Observed: 5.46 ft at 2:24AM Jul 31, 2021Observed: 5.63 ft at 2:30AM Jul 31, 2021Observed: 5.82 ft at 2:36AM Jul 31, 2021Observed: 5.99 ft at 2:42AM Jul 31, 2021Observed: 6.17 ft at 2:48AM Jul 31, 2021Observed: 6.34 ft at 2:54AM Jul 31, 2021Observed: 6.54 ft at 3:00AM Jul 31, 2021Observed: 6.74 ft at 3:06AM Jul 31, 2021Observed: 6.92 ft at 3:12AM Jul 31, 2021Observed: 7.08 ft at 3:18AM Jul 31, 2021Observed: 7.22 ft at 3:24AM Jul 31, 2021Observed: 7.36 ft at 3:30AM Jul 31, 2021Observed: 7.49 ft at 3:36AM Jul 31, 2021Observed: 7.61 ft at 3:42AM Jul 31, 2021Observed: 7.74 ft at 3:48AM Jul 31, 2021Observed: 7.86 ft at 3:54AM Jul 31, 2021Observed: 7.99 ft at 4:00AM Jul 31, 2021Observed: 8.13 ft at 4:06AM Jul 31, 2021Observed: 8.31 ft at 4:12AM Jul 31, 2021Observed: 8.46 ft at 4:18AM Jul 31, 2021Observed: 8.61 ft at 4:24AM Jul 31, 2021Observed: 8.74 ft at 4:30AM Jul 31, 2021Observed: 8.86 ft at 4:36AM Jul 31, 2021Observed: 8.97 ft at 4:42AM Jul 31, 2021Observed: 9.06 ft at 4:48AM Jul 31, 2021Observed: 9.12 ft at 4:54AM Jul 31, 2021Observed: 9.18 ft at 5:00AM Jul 31, 2021Observed: 9.2 ft at 5:06AM Jul 31, 2021Observed: 9.25 ft at 5:12AM Jul 31, 2021Observed: 9.26 ft at 5:18AM Jul 31, 2021Observed: 9.24 ft at 5:24AM Jul 31, 2021Observed: 9.22 ft at 5:30AM Jul 31, 2021Observed: 9.19 ft at 5:36AM Jul 31, 2021Observed: 9.12 ft at 5:42AM Jul 31, 2021Observed: 9.08 ft at 5:48AM Jul 31, 2021Observed: 9.02 ft at 5:54AM Jul 31, 2021Observed: 8.96 ft at 6:00AM Jul 31, 2021Observed: 8.91 ft at 6:06AM Jul 31, 2021Observed: 8.85 ft at 6:12AM Jul 31, 2021Observed: 8.76 ft at 6:18AM Jul 31, 2021Observed: 8.67 ft at 6:24AM Jul 31, 2021Observed: 8.54 ft at 6:30AM Jul 31, 2021Observed: 8.46 ft at 6:36AM Jul 31, 2021Observed: 8.34 ft at 6:42AM Jul 31, 2021Observed: 8.22 ft at 6:48AM Jul 31, 2021Observed: 8.11 ft at 6:54AM Jul 31, 2021Observed: 8.01 ft at 7:00AM Jul 31, 2021Observed: 7.91 ft at 7:06AM Jul 31, 2021Observed: 7.81 ft at 7:12AM Jul 31, 2021Observed: 7.72 ft at 7:18AM Jul 31, 2021Observed: 5.55 ft at 2:42PM Jul 31, 2021Observed: 5.76 ft at 2:48PM Jul 31, 2021Observed: 5.98 ft at 2:54PM Jul 31, 2021Observed: 6.18 ft at 3:00PM Jul 31, 2021Observed: 6.36 ft at 3:06PM Jul 31, 2021Observed: 6.52 ft at 3:12PM Jul 31, 2021Observed: 6.71 ft at 3:18PM Jul 31, 2021Observed: 6.92 ft at 3:24PM Jul 31, 2021Observed: 7.12 ft at 3:30PM Jul 31, 2021Observed: 7.3 ft at 3:36PM Jul 31, 2021Observed: 7.47 ft at 3:42PM Jul 31, 2021Observed: 7.67 ft at 3:48PM Jul 31, 2021Observed: 7.83 ft at 3:54PM Jul 31, 2021Observed: 8.01 ft at 4:00PM Jul 31, 2021Observed: 8.15 ft at 4:06PM Jul 31, 2021Observed: 8.29 ft at 4:12PM Jul 31, 2021Observed: 8.41 ft at 4:18PM Jul 31, 2021Observed: 8.54 ft at 4:24PM Jul 31, 2021Observed: 8.65 ft at 4:30PM Jul 31, 2021Observed: 8.81 ft at 4:36PM Jul 31, 2021Observed: 8.9 ft at 4:42PM Jul 31, 2021Observed: 9.01 ft at 4:48PM Jul 31, 2021Observed: 9.38 ft at 5:12PM Jul 31, 2021Observed: 9.44 ft at 5:18PM Jul 31, 2021Observed: 8.75 ft at 7:12PM Jul 31, 2021Observed: 8.61 ft at 7:18PM Jul 31, 2021Observed: 8.17 ft at 7:42PM Jul 31, 2021Observed: 8.04 ft at 7:48PM Jul 31, 2021Observed: 7.78 ft at 8:00PM Jul 31, 2021Observed: 7.61 ft at 8:06PM Jul 31, 2021Observed: 7.43 ft at 8:12PM Jul 31, 2021Observed: 7.26 ft at 8:18PM Jul 31, 2021Observed: 7.11 ft at 8:24PM Jul 31, 2021Observed: 6.95 ft at 8:30PM Jul 31, 2021Observed: 6.79 ft at 8:36PM Jul 31, 2021Observed: 6.59 ft at 8:42PM Jul 31, 2021Observed: 6.44 ft at 8:48PM Jul 31, 2021Observed: 6.25 ft at 8:54PM Jul 31, 2021Observed: 6.08 ft at 9:00PM Jul 31, 2021Observed: 5.89 ft at 9:06PM Jul 31, 2021Observed: 5.69 ft at 9:12PM Jul 31, 2021Observed: 5.47 ft at 9:18PM Jul 31, 2021Observed: 5.27 ft at 9:24PM Jul 31, 2021Observed: 5.09 ft at 9:30PM Jul 31, 2021Observed: 4.9 ft at 9:36PM Jul 31, 2021Observed: 4.7 ft at 9:42PM Jul 31, 2021Observed: 4.51 ft at 9:48PM Jul 31, 2021Observed: 4.33 ft at 9:54PM Jul 31, 2021Observed: 4.16 ft at 10:00PM Jul 31, 2021Observed: 4 ft at 10:06PM Jul 31, 2021Observed: 3.48 ft at 10:24PM Jul 31, 2021Observed: 3.3 ft at 10:30PM Jul 31, 2021Observed: 3.14 ft at 10:36PM Jul 31, 2021Observed: 2.97 ft at 10:42PM Jul 31, 2021Observed: 2.83 ft at 10:48PM Jul 31, 2021Observed: 2.69 ft at 10:54PM Jul 31, 2021Observed: 2.55 ft at 11:00PM Jul 31, 2021Observed: 2.44 ft at 11:06PM Jul 31, 2021Observed: 1.87 ft at 12:24AM Aug 01, 2021Observed: 1.92 ft at 12:30AM Aug 01, 2021Observed: 1.99 ft at 12:36AM Aug 01, 2021Observed: 2.06 ft at 12:42AM Aug 01, 2021Observed: 2.13 ft at 12:48AM Aug 01, 2021Observed: 2.15 ft at 12:54AM Aug 01, 2021Observed: 2.24 ft at 1:00AM Aug 01, 2021Observed: 2.34 ft at 1:06AM Aug 01, 2021Observed: 2.42 ft at 1:12AM Aug 01, 2021Observed: 2.54 ft at 1:18AM Aug 01, 2021Observed: 2.61 ft at 1:24AM Aug 01, 2021Observed: 2.72 ft at 1:30AM Aug 01, 2021Observed: 2.81 ft at 1:36AM Aug 01, 2021Observed: 2.91 ft at 1:42AM Aug 01, 2021Observed: 3.03 ft at 1:48AM Aug 01, 2021Observed: 3.15 ft at 1:54AM Aug 01, 2021Observed: 3.27 ft at 2:00AM Aug 01, 2021Observed: 3.38 ft at 2:06AM Aug 01, 2021Observed: 3.52 ft at 2:12AM Aug 01, 2021Observed: 3.66 ft at 2:18AM Aug 01, 2021Observed: 3.81 ft at 2:24AM Aug 01, 2021Observed: 3.96 ft at 2:30AM Aug 01, 2021Observed: 4.13 ft at 2:36AM Aug 01, 2021Observed: 4.28 ft at 2:42AM Aug 01, 2021Observed: 4.44 ft at 2:48AM Aug 01, 2021Observed: 5.09 ft at 3:12AM Aug 01, 2021Observed: 5.28 ft at 3:18AM Aug 01, 2021Observed: 5.45 ft at 3:24AM Aug 01, 2021Observed: 5.61 ft at 3:30AM Aug 01, 2021Observed: 5.8 ft at 3:36AM Aug 01, 2021Observed: 5.98 ft at 3:42AM Aug 01, 2021Observed: 6.15 ft at 3:48AM Aug 01, 2021Observed: 6.32 ft at 3:54AM Aug 01, 2021Observed: 6.5 ft at 4:00AM Aug 01, 2021Observed: 6.65 ft at 4:06AM Aug 01, 2021Observed: 6.81 ft at 4:12AM Aug 01, 2021Observed: 6.97 ft at 4:18AM Aug 01, 2021Observed: 7.12 ft at 4:24AM Aug 01, 2021Observed: 7.29 ft at 4:30AM Aug 01, 2021Observed: 7.44 ft at 4:36AM Aug 01, 2021Observed: 7.58 ft at 4:42AM Aug 01, 2021Observed: 7.72 ft at 4:48AM Aug 01, 2021Observed: 7.86 ft at 4:54AM Aug 01, 2021Observed: 8 ft at 5:00AM Aug 01, 2021Observed: 8.13 ft at 5:06AM Aug 01, 2021Observed: 8.23 ft at 5:12AM Aug 01, 2021Observed: 8.32 ft at 5:18AM Aug 01, 2021Observed: 8.41 ft at 5:24AM Aug 01, 2021Observed: 8.51 ft at 5:30AM Aug 01, 2021Observed: 8.59 ft at 5:36AM Aug 01, 2021Observed: 8.66 ft at 5:42AM Aug 01, 2021Observed: 8.71 ft at 5:48AM Aug 01, 2021Observed: 8.77 ft at 5:54AM Aug 01, 2021Observed: 8.81 ft at 6:00AM Aug 01, 2021Observed: 8.85 ft at 6:06AM Aug 01, 2021Observed: 8.88 ft at 6:12AM Aug 01, 2021Observed: 8.87 ft at 6:18AM Aug 01, 2021Observed: 8.85 ft at 6:24AM Aug 01, 2021Observed: 8.84 ft at 6:30AM Aug 01, 2021Observed: 8.81 ft at 6:36AM Aug 01, 2021Observed: 8.78 ft at 6:42AM Aug 01, 2021Observed: 8.74 ft at 6:48AM Aug 01, 2021Observed: 8.69 ft at 6:54AM Aug 01, 2021Observed: 8.64 ft at 7:00AM Aug 01, 2021Observed: 8.61 ft at 7:06AM Aug 01, 2021Observed: 8.54 ft at 7:12AM Aug 01, 2021Observed: 8.47 ft at 7:18AM Aug 01, 2021Observed: 8.38 ft at 7:24AM Aug 01, 2021Observed: 8.27 ft at 7:30AM Aug 01, 2021Observed: 8.16 ft at 7:36AM Aug 01, 2021Observed: 8.05 ft at 7:42AM Aug 01, 2021Observed: 7.92 ft at 7:48AM Aug 01, 2021Observed: 7.81 ft at 7:54AM Aug 01, 2021Observed: 7.68 ft at 8:00AM Aug 01, 2021Observed: 7.55 ft at 8:06AM Aug 01, 2021Observed: 7.43 ft at 8:12AM Aug 01, 2021Observed: 7.3 ft at 8:18AM Aug 01, 2021Observed: 7.14 ft at 8:24AM Aug 01, 2021Observed: 6.98 ft at 8:30AM Aug 01, 2021Observed: 6.84 ft at 8:36AM Aug 01, 2021Observed: 6.67 ft at 8:42AM Aug 01, 2021Observed: 6.53 ft at 8:48AM Aug 01, 2021Observed: 6.37 ft at 8:54AM Aug 01, 2021Observed: 6.21 ft at 9:00AM Aug 01, 2021Observed: 6.07 ft at 9:06AM Aug 01, 2021Observed: 5.92 ft at 9:12AM Aug 01, 2021Observed: 5.77 ft at 9:18AM Aug 01, 2021Observed: 5.63 ft at 9:24AM Aug 01, 2021Observed: 5.48 ft at 9:30AM Aug 01, 2021Observed: 5.33 ft at 9:36AM Aug 01, 2021Observed: 4.85 ft at 9:54AM Aug 01, 2021Observed: 4.69 ft at 10:00AM Aug 01, 2021Observed: 4.54 ft at 10:06AM Aug 01, 2021Observed: 4.36 ft at 10:12AM Aug 01, 2021Observed: 4.19 ft at 10:18AM Aug 01, 2021Observed: 4.04 ft at 10:24AM Aug 01, 2021Observed: 3.9 ft at 10:30AM Aug 01, 2021Observed: 3.74 ft at 10:36AM Aug 01, 2021Observed: 3.58 ft at 10:42AM Aug 01, 2021Observed: 3.44 ft at 10:48AM Aug 01, 2021Observed: 3.28 ft at 10:54AM Aug 01, 2021Observed: 3.15 ft at 11:00AM Aug 01, 2021Observed: 2.99 ft at 11:06AM Aug 01, 2021Observed: 2.89 ft at 11:12AM Aug 01, 2021Observed: 2.74 ft at 11:18AM Aug 01, 2021Observed: 2.63 ft at 11:24AM Aug 01, 2021Observed: 2.58 ft at 11:30AM Aug 01, 2021Observed: 2.5 ft at 11:36AM Aug 01, 2021Observed: 2.42 ft at 11:42AM Aug 01, 2021Observed: 2.32 ft at 11:48AM Aug 01, 2021Observed: 2.28 ft at 11:54AM Aug 01, 2021Observed: 2.24 ft at 12:00PM Aug 01, 2021Observed: 2.2 ft at 12:06PM Aug 01, 2021Observed: 2.17 ft at 12:12PM Aug 01, 2021Observed: 2.16 ft at 12:18PM Aug 01, 2021Observed: 2.17 ft at 12:24PM Aug 01, 2021Observed: 2.15 ft at 12:30PM Aug 01, 2021Observed: 2.18 ft at 12:36PM Aug 01, 2021Observed: 2.23 ft at 12:42PM Aug 01, 2021Observed: 2.27 ft at 12:48PM Aug 01, 2021Observed: 2.33 ft at 12:54PM Aug 01, 2021Observed: 2.41 ft at 1:00PM Aug 01, 2021Observed: 2.51 ft at 1:06PM Aug 01, 2021Observed: 2.6 ft at 1:12PM Aug 01, 2021Observed: 2.68 ft at 1:18PM Aug 01, 2021Observed: 2.81 ft at 1:24PM Aug 01, 2021Observed: 2.95 ft at 1:30PM Aug 01, 2021Observed: 3.11 ft at 1:36PM Aug 01, 2021Observed: 3.2 ft at 1:42PM Aug 01, 2021Observed: 3.34 ft at 1:48PM Aug 01, 2021Observed: 3.49 ft at 1:54PM Aug 01, 2021Observed: 3.62 ft at 2:00PM Aug 01, 2021Observed: 3.76 ft at 2:06PM Aug 01, 2021Observed: 3.89 ft at 2:12PM Aug 01, 2021Observed: 4.01 ft at 2:18PM Aug 01, 2021Observed: 4.12 ft at 2:24PM Aug 01, 2021Observed: 4.25 ft at 2:30PM Aug 01, 2021Observed: 4.35 ft at 2:36PM Aug 01, 2021Observed: 4.51 ft at 2:42PM Aug 01, 2021Observed: 4.63 ft at 2:48PM Aug 01, 2021Observed: 4.84 ft at 2:54PM Aug 01, 2021Observed: 5.04 ft at 3:00PM Aug 01, 2021Observed: 5.17 ft at 3:06PM Aug 01, 2021Observed: 5.37 ft at 3:12PM Aug 01, 2021Observed: 5.59 ft at 3:18PM Aug 01, 2021Observed: 5.78 ft at 3:24PM Aug 01, 2021Observed: 5.94 ft at 3:30PM Aug 01, 2021Observed: 6.11 ft at 3:36PM Aug 01, 2021Observed: 6.29 ft at 3:42PM Aug 01, 2021Observed: 6.43 ft at 3:48PM Aug 01, 2021Observed: 6.57 ft at 3:54PM Aug 01, 2021Observed: 6.75 ft at 4:00PM Aug 01, 2021Observed: 6.88 ft at 4:06PM Aug 01, 2021Observed: 7.07 ft at 4:12PM Aug 01, 2021Observed: 7.2 ft at 4:18PM Aug 01, 2021Observed: 7.38 ft at 4:24PM Aug 01, 2021Observed: 7.53 ft at 4:30PM Aug 01, 2021Observed: 7.73 ft at 4:36PM Aug 01, 2021Observed: 7.88 ft at 4:42PM Aug 01, 2021Observed: 8.05 ft at 4:48PM Aug 01, 2021Observed: 8.19 ft at 4:54PM Aug 01, 2021Observed: 8.35 ft at 5:00PM Aug 01, 2021Observed: 8.49 ft at 5:06PM Aug 01, 2021Observed: 8.64 ft at 5:12PM Aug 01, 2021Observed: 8.82 ft at 5:18PM Aug 01, 2021Observed: 8.98 ft at 5:24PM Aug 01, 2021Observed: 9.08 ft at 5:30PM Aug 01, 2021Observed: 9.22 ft at 5:36PM Aug 01, 2021Observed: 9.33 ft at 5:42PM Aug 01, 2021Observed: 9.43 ft at 5:48PM Aug 01, 2021Observed: 9.51 ft at 5:54PM Aug 01, 2021Observed: 9.59 ft at 6:00PM Aug 01, 2021Observed: 9.65 ft at 6:06PM Aug 01, 2021Observed: 9.68 ft at 6:12PM Aug 01, 2021Observed: 9.73 ft at 6:18PM Aug 01, 2021Observed: 9.77 ft at 6:24PM Aug 01, 2021Observed: 9.79 ft at 6:30PM Aug 01, 2021Observed: 9.83 ft at 6:36PM Aug 01, 2021Observed: 9.85 ft at 6:42PM Aug 01, 2021Observed: 9.84 ft at 6:48PM Aug 01, 2021Observed: 9.83 ft at 6:54PM Aug 01, 2021Observed: 9.85 ft at 7:00PM Aug 01, 2021Observed: 9.83 ft at 7:06PM Aug 01, 2021Observed: 9.81 ft at 7:12PM Aug 01, 2021Observed: 9.74 ft at 7:18PM Aug 01, 2021Observed: 9.66 ft at 7:24PM Aug 01, 2021Observed: 9.58 ft at 7:30PM Aug 01, 2021Observed: 9.49 ft at 7:36PM Aug 01, 2021Observed: 9.4 ft at 7:42PM Aug 01, 2021Observed: 9.27 ft at 7:48PM Aug 01, 2021Observed: 8.91 ft at 8:06PM Aug 01, 2021Observed: 8.78 ft at 8:12PM Aug 01, 2021Observed: 8.65 ft at 8:18PM Aug 01, 2021Observed: 8.53 ft at 8:24PM Aug 01, 2021Observed: 8.42 ft at 8:30PM Aug 01, 2021Observed: 8.29 ft at 8:36PM Aug 01, 2021Observed: 8.14 ft at 8:42PM Aug 01, 2021Observed: 8.01 ft at 8:48PM Aug 01, 2021Observed: 7.89 ft at 8:54PM Aug 01, 2021Observed: 7.76 ft at 9:00PM Aug 01, 2021Observed: 7.6 ft at 9:06PM Aug 01, 2021Observed: 7.47 ft at 9:12PM Aug 01, 2021Observed: 7.3 ft at 9:18PM Aug 01, 2021Observed: 7.07 ft at 9:24PM Aug 01, 2021Observed: 6.86 ft at 9:30PM Aug 01, 2021Observed: 6.67 ft at 9:36PM Aug 01, 2021Observed: 6.51 ft at 9:42PM Aug 01, 2021Observed: 6.35 ft at 9:48PM Aug 01, 2021Observed: 6.18 ft at 9:54PM Aug 01, 2021Observed: 6.02 ft at 10:00PM Aug 01, 2021Observed: 5.85 ft at 10:06PM Aug 01, 2021Observed: 5.68 ft at 10:12PM Aug 01, 2021Observed: 5.52 ft at 10:18PM Aug 01, 2021Observed: 5.32 ft at 10:24PM Aug 01, 2021Observed: 5.1 ft at 10:30PM Aug 01, 2021Observed: 4.91 ft at 10:36PM Aug 01, 2021Observed: 4.72 ft at 10:42PM Aug 01, 2021Observed: 4.57 ft at 10:48PM Aug 01, 2021Observed: 4.44 ft at 10:54PM Aug 01, 2021Observed: 4.28 ft at 11:00PM Aug 01, 2021Observed: 4.12 ft at 11:06PM Aug 01, 2021Observed: 3.95 ft at 11:12PM Aug 01, 2021Observed: 3.8 ft at 11:18PM Aug 01, 2021Observed: 3.65 ft at 11:24PM Aug 01, 2021Observed: 3.49 ft at 11:30PM Aug 01, 2021Observed: 3.31 ft at 11:36PM Aug 01, 2021Observed: 3.14 ft at 11:42PM Aug 01, 2021Observed: 3 ft at 11:48PM Aug 01, 2021Observed: 2.85 ft at 11:54PM Aug 01, 2021Observed: 2.72 ft at 12:00AM Aug 02, 2021Observed: 2.6 ft at 12:06AM Aug 02, 2021Observed: 2.5 ft at 12:12AM Aug 02, 2021Observed: 2.41 ft at 12:18AM Aug 02, 2021Observed: 2.34 ft at 12:24AM Aug 02, 2021Observed: 2.33 ft at 12:30AM Aug 02, 2021Observed: 2.27 ft at 12:36AM Aug 02, 2021Observed: 2.24 ft at 12:42AM Aug 02, 2021Observed: 2.22 ft at 12:48AM Aug 02, 2021Observed: 2.23 ft at 12:54AM Aug 02, 2021Observed: 2.23 ft at 1:00AM Aug 02, 2021Observed: 2.21 ft at 1:06AM Aug 02, 2021Observed: 2.23 ft at 1:12AM Aug 02, 2021Observed: 2.25 ft at 1:18AM Aug 02, 2021Observed: 2.23 ft at 1:24AM Aug 02, 2021Observed: 2.26 ft at 1:30AM Aug 02, 2021Observed: 2.31 ft at 1:36AM Aug 02, 2021Observed: 2.38 ft at 1:42AM Aug 02, 2021Observed: 2.43 ft at 1:48AM Aug 02, 2021Observed: 2.5 ft at 1:54AM Aug 02, 2021Observed: 2.6 ft at 2:00AM Aug 02, 2021Observed: 2.7 ft at 2:06AM Aug 02, 2021Observed: 2.81 ft at 2:12AM Aug 02, 2021Observed: 2.91 ft at 2:18AM Aug 02, 2021Observed: 3.03 ft at 2:24AM Aug 02, 2021Observed: 3.11 ft at 2:30AM Aug 02, 2021Observed: 3.21 ft at 2:36AM Aug 02, 2021Observed: 3.32 ft at 2:42AM Aug 02, 2021Observed: 3.4 ft at 2:48AM Aug 02, 2021Observed: 3.48 ft at 2:54AM Aug 02, 2021Observed: 3.59 ft at 3:00AM Aug 02, 2021Observed: 3.7 ft at 3:06AM Aug 02, 2021Forecast: 5.3 ft 4:00AM Aug 02, 2021Forecast: 7.1 ft 5:00AM Aug 02, 2021Forecast: 8.6 ft 6:00AM Aug 02, 2021Forecast: 9.2 ft 7:00AM Aug 02, 2021Forecast: 8.9 ft 8:00AM Aug 02, 2021Forecast: 8 ft 9:00AM Aug 02, 2021Forecast: 6.7 ft 10:00AM Aug 02, 2021Forecast: 5.2 ft 11:00AM Aug 02, 2021Forecast: 3.8 ft 12:00PM Aug 02, 2021Forecast: 3.2 ft 1:00PM Aug 02, 2021Forecast: 3.5 ft 2:00PM Aug 02, 2021Forecast: 4.5 ft 3:00PM Aug 02, 2021Forecast: 5.8 ft 4:00PM Aug 02, 2021Forecast: 7.4 ft 5:00PM Aug 02, 2021Forecast: 9 ft 6:00PM Aug 02, 2021Forecast: 9.9 ft 7:00PM Aug 02, 2021Highest Forecast: 10 ft 8:00PM Aug 02, 2021Forecast: 9 ft 9:00PM Aug 02, 2021Forecast: 7.6 ft 10:00PM Aug 02, 2021Forecast: 5.9 ft 11:00PM Aug 02, 2021Forecast: 4.1 ft 12:00AM Aug 03, 2021Forecast: 2.8 ft 1:00AM Aug 03, 2021Forecast: 2.4 ft 2:00AM Aug 03, 2021Forecast: 2.9 ft 3:00AM Aug 03, 2021Forecast: 3.9 ft 4:00AM Aug 03, 2021Forecast: 5.1 ft 5:00AM Aug 03, 2021Forecast: 6.8 ft 6:00AM Aug 03, 2021Forecast: 8.1 ft 7:00AM Aug 03, 2021Forecast: 8.8 ft 8:00AM Aug 03, 2021Forecast: 8.4 ft 9:00AM Aug 03, 2021Forecast: 7.5 ft 10:00AM Aug 03, 2021Forecast: 6.3 ft 11:00AM Aug 03, 2021Forecast: 4.8 ft 12:00PM Aug 03, 2021Forecast: 3.5 ft 1:00PM Aug 03, 2021Forecast: 3 ft 2:00PM Aug 03, 2021Forecast: 3.4 ft 3:00PM Aug 03, 2021Forecast: 4.5 ft 4:00PM Aug 03, 2021Forecast: 5.8 ft 5:00PM Aug 03, 2021Forecast: 7.5 ft 6:00PM Aug 03, 2021Forecast: 9.1 ft 7:00PM Aug 03, 2021Highest Forecast: 10 ft 8:00PM Aug 03, 2021Forecast: 9.6 ft 9:00PM Aug 03, 2021Forecast: 8.7 ft 10:00PM Aug 03, 2021Forecast: 7.4 ft 11:00PM Aug 03, 2021Forecast: 5.7 ft 12:00AM Aug 04, 2021Forecast: 3.9 ft 1:00AM Aug 04, 2021Forecast: 2.5 ft 2:00AM Aug 04, 2021Forecast: 2.2 ft 3:00AM Aug 04, 2021Forecast: 2.8 ft 4:00AM Aug 04, 2021Forecast: 3.8 ft 5:00AM Aug 04, 2021Forecast: 5.2 ft 6:00AM Aug 04, 2021Forecast: 6.9 ft 7:00AM Aug 04, 2021Forecast: 8.3 ft 8:00AM Aug 04, 2021Forecast: 8.7 ft 9:00AM Aug 04, 2021Forecast: 8.4 ft 10:00AM Aug 04, 2021Forecast: 7.4 ft 11:00AM Aug 04, 2021Forecast: 6.2 ft 12:00PM Aug 04, 2021Forecast: 4.7 ft 1:00PM Aug 04, 2021Forecast: 3.4 ft 2:00PM Aug 04, 2021Forecast: 3 ft 3:00PM Aug 04, 2021Forecast: 3.6 ft 4:00PM Aug 04, 2021Forecast: 4.7 ft 5:00PM Aug 04, 2021Forecast: 6.1 ft 6:00PM Aug 04, 2021Forecast: 7.8 ft 7:00PM Aug 04, 2021Forecast: 9.2 ft 8:00PM Aug 04, 2021Highest Forecast: 10 ft 9:00PM Aug 04, 2021Forecast: 9.7 ft 10:00PM Aug 04, 2021Forecast: 8.7 ft 11:00PM Aug 04, 2021Forecast: 7.3 ft 12:00AM Aug 05, 2021Forecast: 5.4 ft 1:00AM Aug 05, 2021NOAA Center for Operational Oceanographic Products and ServicesBHBM3(plotting HMIRG) Graph Created (3:30AM Aug 2, 2021)ObservedForecast (issued 2:37AM Aug 2)Latest observed value: 3.7 ft at 3:06 AM EDT 2-Aug-2021. 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: 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) 12.65 ft on 02/02/2021 (P)
(2) 13.25 ft on 02/02/2021 (P)
(3) 12.69 ft on 01/16/2021 (P)
(4) 13.18 ft on 12/17/2020 (P)
(5) 12.80 ft on 12/14/2020 (P)
(6) 12.68 ft on 11/16/2020 (P)
(7) 12.78 ft on 05/09/2020 (P)
(8) 12.83 ft on 05/08/2020 (P)
(9) 12.50 ft on 05/07/2020 (P)
(10) 12.92 ft on 04/10/2020 (P)
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
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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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