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This probabilistic forecast is issued by the Lower Mississippi River Forecast Center.
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About this graph
Forecasts for the Mermentau River at Mermentau are issued routinely year-round.
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Upstream Locations Upstream Gauge
Zoom Level:16
Flood Categories (in feet)
Major Flood Stage: 8
Moderate Flood Stage: 6
Flood Stage: 4
Action Stage: 4
Low Stage (in feet): 0

Historic Crests
(1) 14.50 ft on 08/07/1940
(2) 10.68 ft on 08/18/2016
(3) 10.56 ft on 01/15/2013
(4) 9.47 ft on 12/10/1972
(5) 9.05 ft on 04/25/1977
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 4.34 ft on 10/01/2022
(2) 7.48 ft on 05/22/2021
(3) 5.90 ft on 10/15/2020
(4) 5.46 ft on 08/31/2020
(5) 6.23 ft on 05/14/2019
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) -0.94 ft on 07/13/1951
(2) -0.03 ft on 08/15/1985
(3) 0.06 ft on 11/08/1990
Show More Low Water Records
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Gauge LocationGauge Map Marker
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 Between 16 and 17 ft, flood waters reach the gauge over the mermentau river.
15.1 Between 15.1 and 16.0 ft, flood waters reach the base of the southern pacific railroad bridge east of mermentau across an unnamed tributary.
14.3 The river is at its flood of record. Widespread major to catastrophic flooding will occur.
13.4 The river is near its 100 year flood level. Most of the community of mermentau is inundated with flood waters.
13.3 Water reaches the roadway of the of U.S. 90 bridge east of Mermentau.
11.9 Flood waters reach the roadway on the Field Road bridge east of mermentau.
10 Widespread flooding over a large area from Interstate 10 to Lake Arthur with numerous homes and roads flooded. The community of Morse will be inundated with water. Much of Estherwood will be inundated due to backwater flooding from Bayou Plaquemine. Areas around Gueydan will be inundated with water due to backwater flooding from Bayou Que de Tortue. Communities of Klondike and Lowery will experience flooding as well.
9.5 Widespread major flooding will occur with residential flooding in and around mermentau to the lake arthur area. Numerous roads are inundated across a large area including u.S. 90, la 3166, la 1126, and la 92.
9 Some residential flooding in and around mermentau will occur. U.S. 90 west of mermentau is closed. Operations at the shipyards are affected. Roads in the mermentau cove area are flooded and impassable. Some residences are subject to flooding along the river near lake arthur.
8.5 Some residential flooding in mermentau will occur. Operations at leevac shipyard can be affected. U.S. Highway 90 west of mermentau is flooded and subject to being closed.
7.5 Water is on the roadway of the Field Road bridge in the southeast part of mermentau.
6.2 The water reaches the roadway of the 13th Street bridge in the southern portion of mermentau.
6 Flooding of the shipyard begins. Portions of castex landing, la 3166, become flooded and impassable.
5.5 A few recreational camps and residences are subject to flooding.
4 Minor lowland flooding near the river will occur.

Other Real-time and/or Archive Data Sources:

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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
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Lake Charles, LA 70607
(337) 477-5285
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Page last modified: 30-Oct-2020 4:09 PM
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