Mermentau River at Mermentau
Louisiana — Water Level & Flood Stage
Located in Acadia County, Louisiana on the Mermentau River. Live water level data from USGS gauge 08012150, updated every 15 minutes.
Current Water Level
Gage Height
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Streamflow
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Last Reading
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Flood Stages
Major Flood
8 ft
Moderate Flood
6 ft
Minor Flood
4 ft
Action Stage
4 ft
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
What Floods at Each Level
16 ft
Between 16 and 17 ft, flood waters reach the gauge over the mermentau river.
15.1 ft
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 ft
The river is at its flood of record. Widespread major to catastrophic flooding will occur.
13.4 ft
The river is near its 100 year flood level. Most of the community of mermentau is inundated with flood waters.
13.3 ft
Water reaches the roadway of the of U.S. 90 bridge east of Mermentau.
10 ft
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 ft
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 ft
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 ft
Some residential flooding in mermentau will occur. Operations at Gulf Island shipyard can be affected. U.S. Highway 90 west of mermentau is flooded and subject to being closed.
6.2 ft
The water reaches the roadway of the 13th Street bridge in the southern portion of mermentau.
6 ft
Flooding of the shipyard begins. Portions of castex landing, la 3166, become flooded and impassable.
5.5 ft
A few recreational camps and residences are subject to flooding.
4 ft
Minor lowland flooding near the river will occur.
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
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Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Aug 6, 1940 | 14.5 ft | — |
| Aug 6, 1940 | 14.5 ft | — |
| Aug 18, 2016 | 10.68 ft | 40,376 cfs |
| Aug 18, 2016 | 10.68 ft | 40,376 cfs |
| Jan 15, 2013 | 10.56 ft | 61,234 cfs |
About This Gauge
USGS Site
NWS LID
MRML1
River
Mermentau River
County
Acadia, LA
Coordinates
30.1900°N, 92.5906°W
Get Flood Alerts for Mermentau River
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of Mermentau River at Mermentau?
The Mermentau River at Mermentau gauge is maintained by USGS (site 08012150) and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for Mermentau River at Mermentau?
The NWS-defined flood stage for Mermentau River at Mermentau is 4 feet. Action stage begins at 4 feet. Moderate flooding starts at 6 feet, and major flooding at 8 feet.
How do I get alerts when Mermentau River rises?
Download StormCast free on Google Play, go to River Gauges, and add Mermentau River at Mermentau to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category — even when your screen is off.
Where is the Mermentau River at Mermentau gauge located?
The gauge is located in Acadia County, Louisiana at coordinates 30.1900°N, 92.5906°W. USGS site number: 08012150. Data is provided by the U.S. Geological Survey and the National Weather Service.
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Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey, Observations courtesy of U.S. Army Corps of Engineers
- River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 48 hours into the future from the forecast issuance time.