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Mermentau River at Mermentau

Highest listed crest 14.50 ftFlood stage 4.0 ft61 crests since 1940

The Mermentau River at Mermentau crested at major flood stage 13 times among the 61 crests the National Weather Service lists from 1940 to 2022. The highest, 14.50 ft on August 7, 1940, was major flooding, 10.50 feet above flood stage.

The gauge

Highest listed crest
14.50 ft
August 7, 1940
Flood stage
4.0 ft
Major flooding from 8.0 ft
Crests at major
13
11th of 107 gauges in Louisiana
Most recent flood crest
October 1, 2022
4.34 ft, minor flooding
Location
Acadia Parish
Near Crowley (13.0 mi)

Flood stages

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

Flood categories, Mermentau River at Mermentau
Action stage4.00—The level at which the NWS or its partners begin to take action
Flood stage (minor)4.026Oct 1, 2022Minimal or no property damage, but possibly some public threat
Moderate flood stage6.019May 22, 2021Some inundation of structures and roads near the stream
Major flood stage8.013May 6, 2017Extensive inundation of structures and roads

Every listed crest

61 crests from 1940 to 2022. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Mermentau River at Mermentau, 1940 to 2022 05101520ft Flood stage 4.0 ftMajor 8.0 ft Aug 7, 1940: 14.50 ft, major floodingJun 2, 1941: 8.66 ft, major floodingJun 13, 1942: 5.30 ft, minor floodingSep 24, 1943: 6.60 ft, moderate floodingJul 10, 1946: 8.27 ft, major floodingJan 20, 1947: 5.95 ft, minor floodingMar 7, 1948: 5.32 ft, minor floodingJun 30, 1957: 7.43 ft, moderate floodingFeb 5, 1959: 6.20 ft, moderate floodingFeb 23, 1961: 6.45 ft, moderate floodingMar 4, 1965: 5.46 ft, minor floodingFeb 17, 1966: 6.94 ft, moderate floodingApr 18, 1967: 8.54 ft, major floodingApr 18, 1969: 8.02 ft, major floodingSep 20, 1971: 5.16 ft, minor floodingDec 10, 1972: 9.47 ft, major floodingApr 21, 1973: 7.74 ft, moderate floodingJan 28, 1974: 7.46 ft, moderate floodingJan 13, 1975: 6.31 ft, moderate floodingApr 25, 1977: 9.05 ft, major floodingJun 4, 1979: 6.80 ft, moderate floodingMay 20, 1980: 8.56 ft, major floodingOct 26, 1984: 6.42 ft, moderate floodingJan 22, 1987: 4.98 ft, minor flooding; 15,200 cubic feet per secondFeb 8, 1988: 4.89 ft, minor flooding; 23,100 cubic feet per secondJul 6, 1989: 8.13 ft, major flooding; 38,200 cubic feet per secondJan 29, 1990: 6.45 ft, moderate floodingMay 13, 1991: 5.87 ft, minor flooding; 17,900 cubic feet per secondApr 11, 1993: 6.05 ft, moderate flooding; 12,700 cubic feet per secondNov 19, 1993: 4.22 ft, minor flooding; 10,500 cubic feet per secondOct 30, 1996: 6.64 ft, moderate flooding; 23,700 cubic feet per secondJan 13, 1998: 5.90 ft, minor flooding; 20,400 cubic feet per secondSep 16, 1998: 6.91 ft, moderate floodingJan 11, 1999: 5.11 ft, minor floodingMay 8, 2000: 2.81 ft, below flood stage; 6,160 cubic feet per secondJun 11, 2001: 5.06 ft, minor floodingSep 6, 2001: 4.99 ft, minor flooding; 17,700 cubic feet per secondApr 12, 2002: 3.88 ft, below flood stage; 13,300 cubic feet per secondNov 6, 2002: 6.89 ft, moderate flooding; 26,300 cubic feet per secondMay 18, 2004: 8.96 ft, major flooding; 47,600 cubic feet per secondSep 28, 2005: 6.46 ft, moderate floodingOct 31, 2006: 6.25 ft, moderate floodingSep 16, 2008: 5.28 ft, minor flooding; 15,760 cubic feet per secondApr 23, 2009: 5.09 ft, minor flooding; 14,343 cubic feet per secondNov 2, 2009: 4.11 ft, minor flooding; 6,976 cubic feet per secondDec 19, 2009: 4.55 ft, minor flooding; 10,154 cubic feet per secondJan 13, 2012: 4.23 ft, minor flooding; 7,774 cubic feet per secondFeb 23, 2012: 4.78 ft, minor flooding; 11,876 cubic feet per secondMar 17, 2012: 4.49 ft, minor flooding; 9,720 cubic feet per secondJan 15, 2013: 10.56 ft, major flooding; 61,234 cubic feet per secondJun 1, 2014: 4.11 ft, minor flooding; 6,673 cubic feet per secondApr 20, 2015: 4.77 ft, minor flooding; 15,590 cubic feet per secondJun 16, 2015: 4.05 ft, minor flooding; 10,828 cubic feet per secondAug 18, 2016: 10.68 ft, major flooding; 40,376 cubic feet per secondMay 6, 2017: 8.61 ft, major floodingFeb 12, 2018: 3.41 ft, below flood stageMay 14, 2019: 6.23 ft, moderate floodingAug 31, 2020: 5.46 ft, minor floodingOct 15, 2020: 5.90 ft, minor flooding; 21,928 cubic feet per secondMay 22, 2021: 7.48 ft, moderate floodingOct 1, 2022: 4.34 ft, minor flooding Highest, 14.50 ft, Aug 7, 1940 19401960198020002020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Mermentau River at Mermentau 1940s: 7 1950s: 2 1960s: 5 1970s: 7 1980s: 5 1990s: 8 2000s: 10 10 2010s: 10 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.

Highest crests

The 50 highest of 61 listed crests.

Highest listed crests, Mermentau River at Mermentau
1Aug 7, 194014.50+10.50Major—
2Aug 18, 201610.68+6.68Major40,376
3Jan 15, 201310.56+6.56Major61,234
4Dec 10, 19729.47+5.47Major—
5Apr 25, 19779.05+5.05Major—
6May 18, 20048.96+4.96Major47,600
7Jun 2, 19418.66+4.66Major—
8May 6, 20178.61+4.61Major—
9May 20, 19808.56+4.56Major—
10Apr 18, 19678.54+4.54Major—
11Jul 10, 19468.27+4.27Major—
12Jul 6, 19898.13+4.13Major38,200
13Apr 18, 19698.02+4.02Major—
14Apr 21, 19737.74+3.74Moderate—
15May 22, 20217.48+3.48Moderate—
16Jan 28, 19747.46+3.46Moderate—
17Jun 30, 19577.43+3.43Moderate—
18Feb 17, 19666.94+2.94Moderate—
19Sep 16, 19986.91+2.91Moderate—
20Nov 6, 20026.89+2.89Moderate26,300
21Jun 4, 19796.80+2.80Moderate—
22Oct 30, 19966.64+2.64Moderate23,700
23Sep 24, 19436.60+2.60Moderate—
24Sep 28, 20056.46+2.46Moderate—
25Feb 23, 19616.45+2.45Moderate—
26Jan 29, 19906.45+2.45Moderate—
27Oct 26, 19846.42+2.42Moderate—
28Jan 13, 19756.31+2.31Moderate—
29Oct 31, 20066.25+2.25Moderate—
30May 14, 20196.23+2.23Moderate—
31Feb 5, 19596.20+2.20Moderate—
32Apr 11, 19936.05+2.05Moderate12,700
33Jan 20, 19475.95+1.95Minor—
34Jan 13, 19985.90+1.90Minor20,400
35Oct 15, 20205.90+1.90Minor21,928
36May 13, 19915.87+1.87Minor17,900
37Mar 4, 19655.46+1.46Minor—
38Aug 31, 20205.46+1.46Minor—
39Mar 7, 19485.32+1.32Minor—
40Jun 13, 19425.30+1.30Minor—
41Sep 16, 20085.28+1.28Minor15,760
42Sep 20, 19715.16+1.16Minor—
43Jan 11, 19995.11+1.11Minor—
44Apr 23, 20095.09+1.09Minor14,343
45Jun 11, 20015.06+1.06Minor—
46Sep 6, 20014.99+0.99Minor17,700
47Jan 22, 19874.98+0.98Minor15,200
48Feb 8, 19884.89+0.89Minor23,100
49Feb 23, 20124.78+0.78Minor11,876
50Apr 20, 20154.77+0.77Minor15,590

The worst floods along the Mermentau River

For this gauge's highest crests, the other gauges on the Mermentau River that crested above flood stage within a week.

August 18, 2016: 10.68 ft here, major flooding

Gauges on the Mermentau River

Flood gauges sharing the river's name, linked within 80 miles of one another.

Flood gauges on the Mermentau River
Catfish Point LockLA4.08.30 ft, Jun 27, 19571
Mermentau this gaugeLA4.014.50 ft, Aug 7, 194013

Other gauges in Acadia Parish

Flood gauges in Acadia Parish
Basile22.034.39 ft, May 20, 19536

Acadia Parish: every hazard · River floods across the country · Louisiana

NOAA National Water Prediction Service, gauge MRML1, 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.