Lake levels
Island Park Reservoir, ID
- water level
- 6276.76 ft
- Condition
- Low for this time of year
- 7-day change
- +1.92 ft
- 30-day change
- -8.95 ft
- 1-year change
- -10.81 ft
Reading as of 2026-09-30 | the U.S. Bureau of Reclamation
- Since yesterday
- +0.26 ft
- 7-day change
- +1.92 ft
- 30-day change
- -8.95 ft
- 1-year change
- -10.81 ft
- Record high
- 6303.20 ft
In brief
Island Park Reservoir stood at 6,276.76 feet on Sep 30, 2026. That is lower than 92% of September readings since 2022.
Source: U.S. Bureau of Reclamation
Lake level timeline
Records and averages
| Current level | 6276.76 ft |
|---|---|
| Record high | 6303.20 ft (2022-06-13) |
| Record low | 6272.08 ft (2023-11-04) |
| Average of all readings | 6297.17 ft |
| Data span | 4 years (1,999 readings) |
Level schematic
Trout stocking on Island Park Reservoir
IDFG stocked Island Park Reservoir 1 time in 2026, 18,720 fish in total. Rainbow Trout at Catchable (12-14 inches). IDFG's published figures for 2026, the most recent season it has confirmed, record 18,720 trout actually released here across 1 visit.
| Species | Fish | When |
|---|---|---|
| Rainbow Trout | 18,720 | 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 Island Park Reservoir full right now?
As of 2026-09-30, Island Park Reservoir sits at 6276.76 ft, which is low for this time of year. Over the past 30 days the level has fallen 8.95 ft.
What is the water level at Island Park Reservoir today?
The most recent reading at Island Park Reservoir is 6276.76 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 Island Park Reservoir has ever been?
The highest level for Island Park Reservoir in our records is 6303.20 ft on 2022-06-13. The lowest is 6272.08 ft on 2023-11-04. Our record covers about 4 years of readings.
Is Island Park Reservoir low for this time of year?
Compared with every September in our records, the current level is higher than 8% 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 Island Park 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. Island Park Reservoir has fallen 8.95 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 Island Park Reservoir changed over the past year?
Island Park Reservoir is -10.81 ft compared with this date last year (6276.76 ft today). The full-history chart above covers 4 years, with a record high of 6303.20 ft and a record low of 6272.08 ft.
Download and cite
Quote this reading
Island Park Reservoir stood at 6,276.76 feet on Sep 30, 2026. That is lower than 92% of September readings since 2022.
Download the full record
island-park-reservoir-id-water-level-history.csv
How to cite
MyWaterLevel, “Island Park Reservoir water level, 2022 to 2026,” data from U.S. Bureau of Reclamation, https://mywaterlevel.com/lake/id/island-park-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.