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Nantucket Harbor at Nantucket (IN MLLW) — water level right now

Nantucket County, Massachusetts · NWS gauge NTKM3
Loading the latest reading…
–
current stage (ft)
 
5
minor flood stage
 
7.87
record crest
set 1991-10-30
–
flood status
official NWS category
Official NOAA forecast → Full US flood map →

Flood stages at this gauge

Where the water stands right now against the four official thresholds:

action · 4
minor · 5
moderate · 6.5
major · 8
Flood stageLevel (ft)What it means
Major flood stage8extensive inundation and significant evacuations — a serious event
Moderate flood stage6.5some buildings and roads inundated; evacuations possible
Minor flood stage5low-lying roads and fields near the river start to flood
Action stage4water is approaching flood level — time to pay attention

Highest floods on record here

#Crest (ft)Datevs. minor flood stage
17.871991-10-30+2.87 above
27.362018-01-04+2.36 above
37.212015-01-27+2.21 above
46.72018-03-03+1.7 above
56.671992-12-12+1.67 above
66.622018-03-02+1.62 above
76.572014-01-03+1.57 above
86.372024-01-13+1.37 above
96.342018-01-30+1.34 above
106.341987-01-02+1.34 above
116.22005-01-23+1.2 above
126.182013-02-09+1.18 above

Historic crests recorded at this gauge by the National Weather Service — the 12 highest on file.

Where this gauge is

The marker is this gauge; nearby gauges load live and are clickable.

Nearby river gauges

Atlantic Coast at Chatham Harbor (IN MLLW) 29 mi away · loading… Quashnet River at Waquoit Village 30 mi away · loading… Atlantic Coast at Dennis Sesuit Harbor (IN MLLW) 32 mi away · loading… Buzzards Bay at Woods Hole (IN MLLW) 34 mi away · loading… Buzzards Bay at New Bedford Hurricane Barrier (IN MLLW) 48 mi away · loading… Atlantic Coast at Provincetown Harbor (IN MLLW) 53 mi away · loading…

Gauge details

NWS gauge IDNTKM3
CountyNantucket
StateMassachusetts
NWS forecast officeNorton
River forecast centerNortheast River Forecast Center
Coordinates41.285, -70.096
Time zoneEST5EDT
Turn Around, Don't Drown. Six inches of moving water can knock you off your feet and twelve inches can float a car. Never drive around barricades or into water of unknown depth — most flood deaths happen in vehicles.

Questions about Nantucket Harbor at Nantucket (IN MLLW)

Is Nantucket Harbor at Nantucket (IN MLLW) flooding right now?

The live reading at the top of this page answers that: the gauge is compared against its official NWS flood stages every 15 minutes. Minor flooding at this gauge begins at 5 ft. Blue means normal, yellow is action stage, orange minor, red moderate and dark red major flooding.

What is flood stage for Nantucket Harbor at Nantucket (IN MLLW)?

major flood stage 8 ft, moderate flood stage 6.5 ft, minor flood stage 5 ft, action stage 4 ft. These are official National Weather Service thresholds set specifically for this gauge, not generic values.

What is the record flood at Nantucket Harbor at Nantucket (IN MLLW)?

The highest crest on file at this gauge is 7.87 ft, reached on 1991-10-30 — that is 2.87 ft above minor flood stage. The full list of the highest crests is in the table on this page.

Where does this data come from?

From the NOAA National Water Prediction Service, the official U.S. river gauge network — a U.S. government work in the public domain. Live stage is refreshed every 15 minutes; flood thresholds and historic crests are refreshed monthly. For life-safety decisions follow NWS Norton and local emergency management.