Anderson Ranch Reservoir Water Level
Idaho · updated daily from the U.S. Bureau of Reclamation
4162.17 ft
Anderson Ranch Reservoir is low for this time of year and falling (-3.71 ft in the last 7 days).
Change since yesterday: -0.47 ft
Reading as of 2026-08-14 · higher than 13% of August readings on record
Where Anderson Ranch Reservoir sits historically
Today's level compared with every reading in our 4.5-year record for this lake.
Since yesterday
-0.47 ft
7-day change
-3.71 ft
30-day change
-17.61 ft
1-year change
-3.19 ft
Last 30 days
Last 12 months
Full history (4.5 years)
Anderson Ranch Reservoir records and averages
| Current level | 4162.17 ft |
|---|---|
| Record high | 4196.14 ft (2026-05-15) |
| Record low | 4119.74 ft (2022-02-20) |
| Average of all readings | 4172.11 ft |
| Data span | 4.5 years (2,000 readings) |
Frequently asked questions
Is Anderson Ranch Reservoir full right now?
As of 2026-08-14, Anderson Ranch Reservoir sits at 4162.17 ft, which is low for this time of year.Over the past 30 days the level has fallen 17.61 ft.
What is the water level at Anderson Ranch Reservoir today?
The most recent reading is 4162.17 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 Anderson Ranch Reservoir has ever been?
The highest level in our records is 4196.14 ft on 2026-05-15. The lowest is 4119.74 ft on 2022-02-20. Our record covers about 4.5 years of readings.
Is Anderson Ranch Reservoir low for this time of year?
Compared with every August in our records, the current level is higher than 13% 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 Anderson Ranch 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. Anderson Ranch Reservoir has fallen 17.61 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 Anderson Ranch Reservoir changed over the past year?
The level is -3.19 ft compared with this date last year (4162.17 ft today). The full-history chart above covers 4.5 years, with a record high of 4196.14 ft and a record low of 4119.74 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.