LakeLevelIs Island Park Reservoir low right now?
Island Park Reservoir was at 6,279.13 ft on October 9, 2026. That is 14.47 ft below the typical level for October 9 — lower than in 9 of 10 past years. Over the past week the lake has been rising about 0.27 ft a day.
Island Park Reservoir on Oct 9 in past years
20256,288.1−8.9
20246,293.5−14.4
20236,296.7−17.6
20226,291.5−12.4
20216,292.0−12.8
20206,294.9−15.8
Daily levels, last two weeks
| Date | Level (ft) | Change |
|---|---|---|
| Oct 9 | 6,279.13 | +0.29 |
| Oct 8 | 6,278.84 | +0.32 |
| Oct 7 | 6,278.52 | +0.33 |
| Oct 6 | 6,278.19 | +0.28 |
| Oct 5 | 6,277.91 | +0.22 |
| Oct 4 | 6,277.69 | +0.21 |
| Oct 3 | 6,277.48 | +0.25 |
| Oct 2 | 6,277.23 | +0.22 |
| Oct 1 | 6,277.01 | +0.25 |
| Sep 30 | 6,276.76 | +0.26 |
| Sep 29 | 6,276.50 | +0.27 |
| Sep 28 | 6,276.23 | +0.31 |
| Sep 27 | 6,275.92 | +0.27 |
| Sep 26 | 6,275.65 | +0.28 |
About Island Park Reservoir
- 10-year range
- 6,272.1 ft (November 4, 2023) to 6,303.2 ft (June 13, 2022)
- Operated by
- U.S. Bureau of Reclamation
- Data
- U.S. Bureau of Reclamation — Island Park Reservoir and Dam (ISL)
- Datum
- NAVD88
Lakes near Island Park Reservoir
- Henrys Lake Dm Henrys FkIdaho · 13 mi 12.8 ft −0.0 wkLower than usual for this time of year
- Hebgen LakeMontana · 31 mi 6,530.0 ft −0.3 wkLatest reading
- Grassy LakeWyoming · 35 mi 7,179.4 ft +0.2 wkLower than usual for this time of year
- Lima ReservoirMontana · 51 mi 6,567.0 ft +0.1 wkNormal for this time of year
- Jackson LakeWyoming · 56 mi 6,733.8 ft +0.1 wkLower than usual for this time of year
- Mud LakeIdaho · 60 mi 4,780.9 ft −0.1 wkNormal for this time of year
Questions
Is Island Park Reservoir low right now?
Island Park Reservoir was at 6,279.13 ft on October 9, 2026. That is 14.47 ft below the typical level for October 9 — lower than in 9 of 10 past years. Over the past week the lake has been rising about 0.27 ft a day.
How often is the Island Park Reservoir level updated?
The operator reports once a day, a day or two behind. This page refreshes several times a day; the time of the latest reading is shown next to the level.
Where does this data come from?
U.S. Bureau of Reclamation (Island Park Reservoir and Dam (ISL)). Readings are provisional and can be revised.