River stage
Mermentau River
- River level
- Normal
- Status
- Below flood stage
Latest readings 2026-10-13 | NWS · USGS
- Gauges reporting
- 3 of 3
- Above flood stage
- 0
- Above action stage
- 0
- Overall
- Below flood stage
- Publisher
- NWS · USGS
In brief
On Oct 13, 2026, 3 of 3 gauges on the Mermentau River reported, and none was above flood stage.
Source: National Weather Service and USGS gauges
Mermentau River levels, gauge by gauge
The Mermentau River is measured at 3 gauges. Flood stages are set per gauge, so the same river is "high" at one town and normal at the next.
| Location | Level | Status |
|---|---|---|
| NWS gauge MLAL1 | 22.53 ft | below flood stage |
| Lacassine Wildlife Refuge | 4.20 ft | no flood stage set |
| Mermentau | 2.20 ft | normal, steady |
Recent levels on the Mermentau River
The gauge with the fullest recent record on this river is Mermentau, LA, with 122 days of readings.
Other rivers nearby
- Vermilion River (LA) 3 gauges
- Bayou Courtableau 3 gauges
- Black River (LA) 2 gauges
- Amite River 7 gauges
- Sabine River 14 gauges
- Pearl River 23 gauges
- Ouachita River 10 gauges
- Red River (AR, LA, OK) 17 gauges
Frequently asked questions
Is the Mermentau River flooding right now?
No. Every one of the 3 reporting gauges on the Mermentau River is below flood stage as of 2026-10-13.
How high is the Mermentau River?
The river is measured at several points and each reads a different height. Mermentau is at 2.20 ft.
Where is the Mermentau River measured?
The National Weather Service and USGS operate 3 gauges on the Mermentau River in Louisiana.
What does flood stage mean?
Flood stage is the height at which a river begins to cause problems at that specific location. It is set per gauge, so the same river can be above flood stage in one town and normal a few miles downstream. Action stage is the lower level at which forecasters start watching closely.
River stages and flood categories from the NOAA National Weather Service; daily history from the U.S. Geological Survey. For flood safety decisions always follow official National Weather Service warnings.