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Atlantic Coast at Portland (IN MLLW)

Highest listed crest 14.57 ftFlood stage 12.0 ft22 crests since 1945

The Atlantic Coast at Portland (IN MLLW) crested at major flood stage 1 time among the 22 crests the National Weather Service lists from 1945 to 2024. The highest, 14.57 ft on January 13, 2024, was major flooding, 2.57 feet above flood stage.

The gauge

Highest listed crest
14.57 ft
January 13, 2024
Flood stage
12.0 ft
Major flooding from 14.0 ft
Crests at major
1
16th of 55 gauges in Maine
Most recent flood crest
November 16, 2024
12.42 ft, minor flooding
Location
Cumberland County
Near South Portland (2.6 mi), Portland (3.5 mi), Westbrook (6.4 mi)
Identifiers
NWS CASM1
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, Atlantic Coast at Portland (IN MLLW)
Action stage10.50—The level at which the NWS or its partners begin to take action
Flood stage (minor)12.05Nov 16, 2024Minimal or no property damage, but possibly some public threat
Moderate flood stage13.016Mar 10, 2024Some inundation of structures and roads near the stream
Major flood stage14.01Jan 13, 2024Extensive inundation of structures and roads

Every listed crest

22 crests from 1945 to 2024. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Atlantic Coast at Portland (IN MLLW), 1945 to 2024 12131415ft Flood stage 12.0 ftMajor 14.0 ft Nov 20, 1945: 13.29 ft, moderate floodingNov 30, 1945: 13.29 ft, moderate floodingDec 29, 1959: 13.09 ft, moderate floodingFeb 19, 1972: 13.09 ft, moderate floodingMar 16, 1976: 13.31 ft, moderate floodingJan 9, 1978: 13.98 ft, moderate floodingApr 7, 1978: 13.09 ft, moderate floodingJan 28, 1979: 13.07 ft, moderate floodingDec 3, 1986: 12.80 ft, minor floodingJan 2, 1987: 13.18 ft, moderate floodingDec 4, 1990: 13.40 ft, moderate floodingOct 30, 1991: 13.18 ft, moderate floodingApr 16, 2007: 13.28 ft, moderate floodingJan 2, 2010: 12.92 ft, minor floodingJun 3, 2012: 13.03 ft, moderate floodingMay 25, 2017: 12.96 ft, minor floodingJan 4, 2018: 13.79 ft, moderate floodingMar 3, 2018: 12.90 ft, minor floodingDec 23, 2022: 13.72 ft, moderate floodingJan 13, 2024: 14.57 ft, major floodingMar 10, 2024: 13.32 ft, moderate floodingNov 16, 2024: 12.42 ft, minor flooding Highest, 14.57 ft, Jan 13, 2024 19501960197019801990200020102020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Atlantic Coast at Portland (IN MLLW) 1940s: 2 1950s: 1 1960s: 0 1970s: 5 5 1980s: 2 1990s: 2 2000s: 1 2010s: 5 2020s: 4 1940s1950s1960s1970s1980s1990s2000s2010s2020s
  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.
  3. 1 crest measured on an earlier gauge datum is left out: 14.17 ft on Feb 7, 1978.

Highest crests

Highest listed crests, Atlantic Coast at Portland (IN MLLW)
1Jan 13, 202414.57+2.57Major—
2Jan 9, 197813.98+1.98Moderate—
3Jan 4, 201813.79+1.79Moderate—
4Dec 23, 202213.72+1.72Moderate—
5Dec 4, 199013.40+1.40Moderate—
6Mar 10, 202413.32+1.32Moderate—
7Mar 16, 197613.31+1.31Moderate—
8Nov 20, 194513.29+1.29Moderate—
9Nov 30, 194513.29+1.29Moderate—
10Apr 16, 200713.28+1.28Moderate—
11Jan 2, 198713.18+1.18Moderate—
12Oct 30, 199113.18+1.18Moderate—
13Dec 29, 195913.09+1.09Moderate—
14Feb 19, 197213.09+1.09Moderate—
15Apr 7, 197813.09+1.09Moderate—
16Jan 28, 197913.07+1.07Moderate—
17Jun 3, 201213.03+1.03Moderate—
18May 25, 201712.96+0.96Minor—
19Jan 2, 201012.92+0.92Minor—
20Mar 3, 201812.90+0.90Minor—
21Dec 3, 198612.80+0.80Minor—
22Nov 16, 202412.42+0.42Minor—

Other gauges in Cumberland County

Flood gauges in Cumberland County
West Falmouth16.021.11 ft, Mar 14, 19770

Cumberland County: every hazard · River floods across the country · Maine

NOAA National Water Prediction Service, gauge CASM1, 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.