Lake levels
Anderson Ranch Reservoir, ID
- water level
- 4151.74 ft
- Condition
- Low for this time of year
- 7-day change
- -0.51 ft
- 30-day change
- -4.39 ft
- 1-year change
- -2.16 ft
Reading as of 2026-09-30 | the U.S. Bureau of Reclamation
- Since yesterday
- -0.08 ft
- 7-day change
- -0.51 ft
- 30-day change
- -4.39 ft
- 1-year change
- -2.16 ft
- Record high
- 4196.14 ft
In brief
Anderson Ranch Reservoir stood at 4,151.74 feet on Sep 30, 2026. That is lower than 100% of September readings since 2022.
Source: U.S. Bureau of Reclamation
Lake level timeline
Records and averages
| Current level | 4151.74 ft |
|---|---|
| Record high | 4196.14 ft (2026-05-15) |
| Record low | 4131.23 ft (2022-04-12) |
| Average of all readings | 4172.98 ft |
| Data span | 4 years (2,000 readings) |
Level schematic
Trout stocking on Anderson Ranch Reservoir
IDFG stocked Anderson Ranch Reservoir 1 time in 2026, 66,934 fish in total. Kokanee at Fingerling (3-6 inches).
| Species | Fish | When |
|---|---|---|
| Kokanee | 66,934 | May 2026 |
IDFG lists a week or a month rather than a date, and counts fish as an estimate. Full Idaho stocking schedule →
Frequently asked questions
Is Anderson Ranch Reservoir full right now?
As of 2026-09-30, Anderson Ranch Reservoir sits at 4151.74 ft, which is low for this time of year. Over the past 30 days the level has fallen 4.39 ft.
What is the water level at Anderson Ranch Reservoir today?
The most recent reading at Anderson Ranch Reservoir is 4151.74 ft (2026-09-30), 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 for Anderson Ranch Reservoir in our records is 4196.14 ft on 2026-05-15. The lowest is 4131.23 ft on 2022-04-12. Our record covers about 4 years of readings.
Is Anderson Ranch Reservoir low for this time of year?
Compared with every September in our records, the current level is higher than 0% of them, which we classify as 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 4.39 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?
Anderson Ranch Reservoir is -2.16 ft compared with this date last year (4151.74 ft today). The full-history chart above covers 4 years, with a record high of 4196.14 ft and a record low of 4131.23 ft.
Download and cite
Quote this reading
Anderson Ranch Reservoir stood at 4,151.74 feet on Sep 30, 2026. That is lower than 100% of September readings since 2022.
Download the full record
anderson-ranch-reservoir-id-water-level-history.csv
How to cite
MyWaterLevel, “Anderson Ranch Reservoir water level, 2022 to 2026,” data from U.S. Bureau of Reclamation, https://mywaterlevel.com/lake/id/anderson-ranch-reservoir/, accessed Oct 13, 2026.
Source: the U.S. Bureau of Reclamation. All Idaho lake levels. Readings are provisional and may be revised. About our data and methods.