Arm of Grand Lake Water Level
Louisiana · updated daily from the U.S. Geological Survey
4.21 ft
Arm of Grand Lake is below average for this time of year and falling (-0.48 ft in the last 7 days).
Change since yesterday: -0.05 ft
Reading as of 2026-08-14 · higher than 21% of August readings on record
Where Arm of Grand Lake sits historically
Today's level compared with every reading in our 4.6-year record for this lake.
Since yesterday
-0.05 ft
7-day change
-0.48 ft
30-day change
-3.58 ft
1-year change
-0.57 ft
Last 30 days
Last 12 months
Full history (4.6 years)
Arm of Grand Lake records and averages
| Current level | 4.21 ft |
|---|---|
| Record high | 13.24 ft (2025-05-07) |
| Record low | 2.62 ft (2024-10-29) |
| Average of all readings | 6.45 ft |
| Data span | 4.6 years (1,178 readings) |
Frequently asked questions
Is Arm of Grand Lake full right now?
As of 2026-08-14, Arm of Grand Lake sits at 4.21 ft, which is below average for this time of year.Over the past 30 days the level has fallen 3.58 ft.
What is the water level at Arm of Grand Lake today?
The most recent reading is 4.21 ft (2026-08-14), sourced from the U.S. Geological Survey. Readings on this page refresh automatically as the agency publishes new data.
What is the highest Arm of Grand Lake has ever been?
The highest level in our records is 13.24 ft on 2025-05-07. The lowest is 2.62 ft on 2024-10-29. Our record covers about 4.6 years of readings.
Is Arm of Grand Lake low for this time of year?
Compared with every August in our records, the current level is higher than 21% of them — below average for this time of year. Seasonal comparison matters more than the raw number, because most reservoirs draw down predictably through late summer and refill over winter and spring.
Why is Arm of Grand Lake low 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. Arm of Grand Lake has fallen 3.58 ft over the past 30 days. For the operational reason on any given week, check the U.S. Geological Survey directly.
How much has Arm of Grand Lake changed over the past year?
The level is -0.57 ft compared with this date last year (4.21 ft today). The full-history chart above covers 4.6 years, with a record high of 13.24 ft and a record low of 2.62 ft.
Nearby lakes in Louisiana
Source: the U.S. Geological Survey. Readings are provisional and subject to revision by the publishing agency. All Louisiana lake levels.