American Falls Reservoir Water Level
Idaho · updated daily from the U.S. Bureau of Reclamation
4315.87 ft
American Falls Reservoir is low for this time of year and falling (-2.77 ft in the last 7 days).
Change since yesterday: -0.26 ft
Reading as of 2026-08-14 · higher than 15% of August readings on record
Where American Falls Reservoir sits historically
Today's level compared with every reading in our 4.5-year record for this lake.
Since yesterday
-0.26 ft
7-day change
-2.77 ft
30-day change
-10.12 ft
1-year change
-3.74 ft
Last 30 days
Last 12 months
Full history (4.5 years)
American Falls Reservoir records and averages
| Current level | 4315.87 ft |
|---|---|
| Record high | 4354.53 ft (2024-05-24) |
| Record low | 4306.52 ft (2025-10-01) |
| Average of all readings | 4336.1 ft |
| Data span | 4.5 years (2,000 readings) |
Frequently asked questions
Is American Falls Reservoir full right now?
As of 2026-08-14, American Falls Reservoir sits at 4315.87 ft, which is low for this time of year.Over the past 30 days the level has fallen 10.12 ft.
What is the water level at American Falls Reservoir today?
The most recent reading is 4315.87 ft (2026-08-14), sourced from the U.S. Bureau of Reclamation. Readings on this page refresh automatically as the agency publishes new data.
What is the highest American Falls Reservoir has ever been?
The highest level in our records is 4354.53 ft on 2024-05-24. The lowest is 4306.52 ft on 2025-10-01. Our record covers about 4.5 years of readings.
Is American Falls Reservoir low for this time of year?
Compared with every August in our records, the current level is higher than 15% of them — low 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 American Falls Reservoir 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. American Falls Reservoir has fallen 10.12 ft over the past 30 days. For the operational reason on any given week, check the U.S. Bureau of Reclamation directly.
How much has American Falls Reservoir changed over the past year?
The level is -3.74 ft compared with this date last year (4315.87 ft today). The full-history chart above covers 4.5 years, with a record high of 4354.53 ft and a record low of 4306.52 ft.
Nearby lakes in Idaho
Source: the U.S. Bureau of Reclamation. Readings are provisional and subject to revision by the publishing agency. All Idaho lake levels.