Reservoir · Idaho · United States · BOR RISE
American Falls Reservoir and Dam
12.9% full
Capacity
2,061.52 hm³
Volume stored
266 hm³
Coordinates
42.779°N, 112.879°W
Last updated
2026-08-12
Current fill
12.9%vs 7 days ago
-4.0%losing
vs 1 year ago
-4.8%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. 42.779, -112.879 · Open in Google Maps
About American Falls Reservoir and Dam
As of August 12, 2026, American Falls Reservoir and Dam is filled to 12.9% of its total capacity, holding roughly 266 hm³ of water out of a maximum 2,062 hm³. At this level the reservoir is critically low.
Over the most recent week on record the fill level has fallen by 4.0 percentage points, and it is 4.8 points below its level on the same date a year earlier.
Across the readings we hold for American Falls Reservoir and Dam — 2187 data points between August 15, 2021 and August 12, 2026 — the level has ranged from a low of 3.0% (September 30, 2025) to a high of 100.2% (May 24, 2024). On average the reservoir is fullest around April and at its lowest around September.
It is operated by BOR primarily for multiple purposes. It lies within the Idaho basin at 42.779°N, 112.879°W.
Key facts
- Current fill level
- 12.9%
- Water stored
- 266 hm³
- Total capacity
- 2,062 hm³
- 7-day change
- ▼ 4.0 pts
- Year-on-year
- ▼ 4.8 pts
- Primary use
- Multipurpose
- River basin
- Idaho
- Operator
- BOR
- Coordinates
- 42.779°N, 112.879°W
- Last updated
- August 12, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 12 Aug 2026 | 12.9% | 266 |
| 11 Aug 2026 | 13.5% | 277 |
| 10 Aug 2026 | 13.9% | 288 |
| 9 Aug 2026 | 14.5% | 299 |
| 8 Aug 2026 | 15.0% | 310 |
| 7 Aug 2026 | 15.5% | 320 |
| 6 Aug 2026 | 16.1% | 332 |
| 5 Aug 2026 | 16.9% | 349 |
| 4 Aug 2026 | 17.7% | 365 |
| 3 Aug 2026 | 18.4% | 379 |
| 2 Aug 2026 | 18.9% | 391 |
| 31 Jul 2026 | 20.3% | 418 |
Frequently asked questions
What is the current water level of American Falls Reservoir and Dam?
As of August 12, 2026, American Falls Reservoir and Dam is at 12.9% of its capacity, holding approximately 266 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is American Falls Reservoir and Dam reservoir full?
No. As of August 12, 2026, American Falls Reservoir and Dam is critically low at 12.9% of its capacity, so it is not full.
Is the water level at American Falls Reservoir and Dam rising or falling?
The level at American Falls Reservoir and Dam is falling — it dropped 4.0 percentage points over the latest week on record.
How much water can American Falls Reservoir and Dam hold?
American Falls Reservoir and Dam has a total capacity of 2,062 hm³.
Where is American Falls Reservoir and Dam reservoir located?
American Falls Reservoir and Dam is located in Idaho, United States, within the Idaho basin (coordinates 42.779°N, 112.879°W).
What is American Falls Reservoir and Dam used for?
American Falls Reservoir and Dam is used primarily for multiple purposes, and is managed by BOR.