Reservoir · Idaho · United States · BOR RISE
Island Park Reservoir and Dam
39.1% full
Capacity
157.45 hm³
Volume stored
62 hm³
Coordinates
44.419°N, 111.398°W
Last updated
2026-08-12
Current fill
39.1%vs 7 days ago
-3.3%losing
vs 1 year ago
-2.3%year-over-year
7-day trend
↓falling
Data source: BOR RISE — US Bureau of Reclamation — daily reservoir storage volume. Capacity is the design (normal full-pool) capacity from the US National Inventory of Dams (NID); fill % = current volume ÷ design capacity. Last reading: 2026-08-12.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 44.419, -111.398 · Open in Google Maps
About Island Park Reservoir and Dam
As of August 12, 2026, Island Park Reservoir and Dam is filled to 39.1% of its total capacity, holding roughly 62 hm³ of water out of a maximum 157 hm³. At this level the reservoir is low.
Over the most recent week on record the fill level has fallen by 3.3 percentage points, and it is 2.3 points below its level on the same date a year earlier.
Across the readings we hold for Island Park Reservoir and Dam — 2190 data points between August 15, 2021 and August 12, 2026 — the level has ranged from a low of 34.4% (September 8, 2025) to a high of 105.0% (May 19, 2022). On average the reservoir is fullest around May and at its lowest around September.
It is operated by BOR primarily for multiple purposes. It lies within the Idaho basin at 44.419°N, 111.398°W.
Key facts
- Current fill level
- 39.1%
- Water stored
- 62 hm³
- Total capacity
- 157 hm³
- 7-day change
- ▼ 3.3 pts
- Year-on-year
- ▼ 2.3 pts
- Primary use
- Multipurpose
- River basin
- Idaho
- Operator
- BOR
- Coordinates
- 44.419°N, 111.398°W
- Last updated
- August 12, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 12 Aug 2026 | 39.1% | 62 |
| 11 Aug 2026 | 39.4% | 62 |
| 10 Aug 2026 | 39.9% | 63 |
| 9 Aug 2026 | 40.4% | 64 |
| 8 Aug 2026 | 41.1% | 65 |
| 7 Aug 2026 | 41.4% | 65 |
| 6 Aug 2026 | 41.9% | 66 |
| 5 Aug 2026 | 42.4% | 67 |
| 4 Aug 2026 | 42.9% | 68 |
| 3 Aug 2026 | 43.4% | 68 |
| 2 Aug 2026 | 43.9% | 69 |
| 1 Aug 2026 | 44.5% | 70 |
Frequently asked questions
What is the current water level of Island Park Reservoir and Dam?
As of August 12, 2026, Island Park Reservoir and Dam is at 39.1% of its capacity, holding approximately 62 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Island Park Reservoir and Dam reservoir full?
No. As of August 12, 2026, Island Park Reservoir and Dam is low at 39.1% of its capacity, so it is not full.
Is the water level at Island Park Reservoir and Dam rising or falling?
The level at Island Park Reservoir and Dam is falling — it dropped 3.3 percentage points over the latest week on record.
How much water can Island Park Reservoir and Dam hold?
Island Park Reservoir and Dam has a total capacity of 157 hm³.
Where is Island Park Reservoir and Dam reservoir located?
Island Park Reservoir and Dam is located in Idaho, United States, within the Idaho basin (coordinates 44.419°N, 111.398°W).
What is Island Park Reservoir and Dam used for?
Island Park Reservoir and Dam is used primarily for multiple purposes, and is managed by BOR.