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Nantucket Harbor at Nantucket (IN MLLW)

Highest listed crest 7.87 ftFlood stage 5.0 ft75 crests since 1967

The Nantucket Harbor at Nantucket (IN MLLW) crested above flood stage 75 times among the 75 crests the National Weather Service lists from 1967 to 2024. The highest, 7.87 ft on October 30, 1991, was moderate flooding, 2.87 feet above flood stage.

The gauge

Highest listed crest
7.87 ft
October 30, 1991
Flood stage
5.0 ft
Major flooding from 8.0 ft
Crests at major
0
75 above flood stage
Most recent flood crest
March 10, 2024
5.42 ft, minor flooding
Location
Nantucket County
Massachusetts
Identifiers
NWS NTKM3
No USGS station

Flood stages

The thresholds the National Weather Service uses for this gauge today, and how many listed crests reached each.

Flood categories, Nantucket Harbor at Nantucket (IN MLLW)
Action stage4.00—The level at which the NWS or its partners begin to take action
Flood stage (minor)5.069Mar 10, 2024Minimal or no property damage, but possibly some public threat
Moderate flood stage6.56Mar 3, 2018Some inundation of structures and roads near the stream
Major flood stage8.00—Extensive inundation of structures and roads

Every listed crest

75 crests from 1967 to 2024. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Nantucket Harbor at Nantucket (IN MLLW), 1967 to 2024 5678ft Flood stage 5.0 ftMajor 8.0 ft Apr 28, 1967: 5.60 ft, minor floodingMay 24, 1967: 5.30 ft, minor floodingNov 11, 1968: 5.50 ft, minor floodingFeb 9, 1969: 5.40 ft, minor floodingDec 25, 1970: 5.20 ft, minor floodingMar 27, 1971: 5.04 ft, minor floodingFeb 18, 1972: 5.60 ft, minor floodingDec 21, 1972: 5.44 ft, minor floodingFeb 11, 1973: 5.16 ft, minor floodingMar 22, 1973: 5.63 ft, minor floodingApr 4, 1973: 5.16 ft, minor floodingMar 16, 1976: 5.21 ft, minor floodingFeb 6, 1978: 6.13 ft, minor floodingJan 24, 1979: 5.79 ft, minor floodingOct 9, 1982: 5.26 ft, minor floodingNov 25, 1983: 5.29 ft, minor floodingMar 29, 1984: 5.13 ft, minor floodingJan 5, 1985: 5.12 ft, minor floodingJan 2, 1987: 6.34 ft, minor floodingJan 31, 1987: 5.44 ft, minor floodingNov 11, 1987: 5.16 ft, minor floodingOct 30, 1991: 7.87 ft, moderate floodingDec 12, 1992: 6.67 ft, moderate floodingDec 16, 1993: 5.68 ft, minor floodingDec 20, 1995: 5.81 ft, minor floodingJan 10, 1997: 5.59 ft, minor floodingJan 29, 1998: 5.58 ft, minor floodingMar 6, 2001: 5.60 ft, minor floodingNov 6, 2002: 5.75 ft, minor floodingJan 4, 2003: 5.71 ft, minor floodingJan 23, 2005: 6.20 ft, minor floodingMay 25, 2005: 5.88 ft, minor floodingJan 31, 2006: 5.60 ft, minor floodingNov 3, 2007: 6.11 ft, minor floodingJan 2, 2010: 5.87 ft, minor floodingMar 7, 2010: 6.11 ft, minor floodingOct 29, 2012: 5.97 ft, minor floodingFeb 9, 2013: 6.18 ft, minor floodingMar 8, 2013: 6.17 ft, minor floodingJan 3, 2014: 6.57 ft, moderate floodingJan 27, 2015: 7.21 ft, moderate floodingFeb 8, 2016: 6.08 ft, minor floodingJan 4, 2018: 7.36 ft, moderate floodingJan 30, 2018: 6.34 ft, minor floodingMar 3, 2018: 6.70 ft, moderate floodingNov 25, 2018: 5.72 ft, minor floodingJan 20, 2019: 5.26 ft, minor floodingMar 22, 2019: 5.17 ft, minor floodingOct 17, 2019: 5.60 ft, minor floodingDec 2, 2019: 5.45 ft, minor floodingDec 14, 2019: 5.54 ft, minor floodingApr 3, 2020: 6.09 ft, minor floodingApr 10, 2020: 5.21 ft, minor floodingMay 9, 2020: 5.11 ft, minor floodingJun 7, 2020: 5.04 ft, minor floodingJul 4, 2020: 5.06 ft, minor floodingOct 30, 2020: 5.11 ft, minor floodingDec 17, 2020: 6.13 ft, minor floodingFeb 2, 2021: 5.64 ft, minor floodingOct 27, 2021: 5.99 ft, minor floodingMay 17, 2022: 5.17 ft, minor floodingJul 14, 2022: 5.07 ft, minor floodingDec 23, 2022: 6.03 ft, minor floodingJan 20, 2023: 5.37 ft, minor floodingJun 5, 2023: 5.26 ft, minor floodingOct 7, 2023: 5.24 ft, minor floodingDec 11, 2023: 5.02 ft, minor floodingDec 18, 2023: 5.63 ft, minor floodingDec 29, 2023: 5.00 ft, minor floodingJan 7, 2024: 5.42 ft, minor floodingJan 13, 2024: 6.37 ft, minor floodingJan 29, 2024: 5.02 ft, minor floodingFeb 5, 2024: 5.09 ft, minor floodingFeb 13, 2024: 5.89 ft, minor floodingMar 10, 2024: 5.42 ft, minor flooding Highest, 7.87 ft, Oct 30, 1991 197019801990200020102020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Nantucket Harbor at Nantucket (IN MLLW) 1960s: 4 1970s: 10 1980s: 7 1990s: 6 2000s: 7 2010s: 17 2020s: 24 24 1960s1970s1980s1990s2000s2010s2020s
  1. These are the crests the local National Weather Service office lists for the gauge: the highest on record and recent crests. Lesser floods between them may be missing, so counts by decade are a floor.
  2. Categories use today's flood stages. Levees, dams and channel changes since a crest can make old and new stages not directly comparable.

Highest crests

The 50 highest of 75 listed crests.

Highest listed crests, Nantucket Harbor at Nantucket (IN MLLW)
1Oct 30, 19917.87+2.87Moderate—
2Jan 4, 20187.36+2.36Moderate—
3Jan 27, 20157.21+2.21Moderate—
4Mar 3, 20186.70+1.70Moderate—
5Dec 12, 19926.67+1.67Moderate—
6Jan 3, 20146.57+1.57Moderate—
7Jan 13, 20246.37+1.37Minor—
8Jan 2, 19876.34+1.34Minor—
9Jan 30, 20186.34+1.34Minor—
10Jan 23, 20056.20+1.20Minor—
11Feb 9, 20136.18+1.18Minor—
12Mar 8, 20136.17+1.17Minor—
13Feb 6, 19786.13+1.13Minor—
14Dec 17, 20206.13+1.13Minor—
15Nov 3, 20076.11+1.11Minor—
16Mar 7, 20106.11+1.11Minor—
17Apr 3, 20206.09+1.09Minor—
18Feb 8, 20166.08+1.08Minor—
19Dec 23, 20226.03+1.03Minor—
20Oct 27, 20215.99+0.99Minor—
21Oct 29, 20125.97+0.97Minor—
22Feb 13, 20245.89+0.89Minor—
23May 25, 20055.88+0.88Minor—
24Jan 2, 20105.87+0.87Minor—
25Dec 20, 19955.81+0.81Minor—
26Jan 24, 19795.79+0.79Minor—
27Nov 6, 20025.75+0.75Minor—
28Nov 25, 20185.72+0.72Minor—
29Jan 4, 20035.71+0.71Minor—
30Dec 16, 19935.68+0.68Minor—
31Feb 2, 20215.64+0.64Minor—
32Mar 22, 19735.63+0.63Minor—
33Dec 18, 20235.63+0.63Minor—
34Apr 28, 19675.60+0.60Minor—
35Feb 18, 19725.60+0.60Minor—
36Mar 6, 20015.60+0.60Minor—
37Jan 31, 20065.60+0.60Minor—
38Oct 17, 20195.60+0.60Minor—
39Jan 10, 19975.59+0.59Minor—
40Jan 29, 19985.58+0.58Minor—
41Dec 14, 20195.54+0.54Minor—
42Nov 11, 19685.50+0.50Minor—
43Dec 2, 20195.45+0.45Minor—
44Dec 21, 19725.44+0.44Minor—
45Jan 31, 19875.44+0.44Minor—
46Jan 7, 20245.42+0.42Minor—
47Mar 10, 20245.42+0.42Minor—
48Feb 9, 19695.40+0.40Minor—
49Jan 20, 20235.37+0.37Minor—
50May 24, 19675.30+0.30Minor—

Nantucket County: every hazard · River floods across the country · Massachusetts

NOAA National Water Prediction Service, gauge NTKM3, retrieved October 30, 2026. Stages in feet on the gauge's own datum, not elevation. Crests are as the National Weather Service lists them; preliminary values may be revised.