Lake levels
Grand Bayou Reservoir, LA
- water level
- 133.78 ft
- Condition
- Steady
- 7-day change
- -0.10 ft
- 30-day change
- -3.53 ft
- 1-year change
- -3.80 ft
Reading as of 2026-10-12 | the U.S. Geological Survey
- Since yesterday
- -0.01 ft
- 7-day change
- -0.10 ft
- 30-day change
- -3.53 ft
- 1-year change
- -3.80 ft
- Record high
- 139.87 ft
In brief
Grand Bayou Reservoir stood at 133.78 feet on Oct 12, 2026.
Source: U.S. Geological Survey
Lake level timeline
Records and averages
| Current level | 133.78 ft |
|---|---|
| Record high | 139.87 ft (2024-06-05) |
| Record low | 133.78 ft (2026-10-12) |
| Average of all readings | 138.09 ft |
| Data span | 3 years (1,134 readings) |
Level schematic
Frequently asked questions
Is Grand Bayou Reservoir full right now?
As of 2026-10-12, Grand Bayou Reservoir sits at 133.78 ft. Over the past 30 days the level has fallen 3.53 ft.
What is the water level at Grand Bayou Reservoir today?
The most recent reading at Grand Bayou Reservoir is 133.78 ft (2026-10-12), sourced from the U.S. Geological Survey. Readings on this page refresh automatically as the agency publishes new data.
What is the highest Grand Bayou Reservoir has ever been?
The highest level for Grand Bayou Reservoir in our records is 139.87 ft on 2024-06-05. The lowest is 133.78 ft on 2026-10-12. Our record covers about 3 years of readings.
Why is Grand Bayou Reservoir changing right now?
Reservoir levels move for four main reasons: rainfall and runoff into the basin, releases through the dam for downstream water supply, power generation or flood control, evaporation during hot months, and seasonal drawdown schedules set by the operating agency. Grand Bayou Reservoir has fallen 3.53 ft over the past 30 days. For the operational reason on any given week, check the U.S. Geological Survey directly.
How much has Grand Bayou Reservoir changed over the past year?
Grand Bayou Reservoir is -3.80 ft compared with this date last year (133.78 ft today). The full-history chart above covers 3 years, with a record high of 139.87 ft and a record low of 133.78 ft.
Download and cite
Quote this reading
Grand Bayou Reservoir stood at 133.78 feet on Oct 12, 2026.
Download the full record
grand-bayou-reservoir-la-water-level-history.csv
How to cite
MyWaterLevel, “Grand Bayou Reservoir water level, 2023 to 2026,” data from U.S. Geological Survey, https://mywaterlevel.com/lake/la/grand-bayou-reservoir/, accessed Oct 13, 2026.
Source: the U.S. Geological Survey. All Louisiana lake levels. Readings are provisional and may be revised. About our data and methods.