Reservoir · Montana · United States · BOR RISE
Hungry Horse Reservoir
Hungry Horse Reservoir, Dam, and Powerplant
89.8% full
Capacity
4,277.72 hm³
Volume stored
3841 hm³
Coordinates
48.341°N, 114.014°W
Last updated
2026-09-30
Current fill
89.8%vs 7 days ago
-0.9%losing
vs 1 year ago
-1.4%year-over-year
7-day trend
→stable
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: 2026-09-30.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 48.341, -114.014 · Open in Google Maps
About Hungry Horse Reservoir
As of September 30, 2026, Hungry Horse Reservoir is filled to 89.8% of its total capacity, holding roughly 3,841 hm³ of water out of a maximum 4,278 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (-0.9 pts), and it is 1.4 points below its level on the same date a year earlier.
Across the readings we hold for Hungry Horse Reservoir — 2191 data points between October 2, 2021 and September 30, 2026 — the level has ranged from a low of 68.9% (April 9, 2023) to a high of 99.8% (June 22, 2026). On average the reservoir is fullest around July and at its lowest around April.
It is operated by BOR primarily for multiple purposes. It lies within the Montana basin at 48.341°N, 114.014°W.
Key facts
- Current fill level
- 89.8%
- Water stored
- 3,841 hm³
- Total capacity
- 4,278 hm³
- 7-day change
- ▼ 0.9 pts
- Year-on-year
- ▼ 1.4 pts
- Primary use
- Multipurpose
- River basin
- Montana
- Operator
- BOR
- Coordinates
- 48.341°N, 114.014°W
- Last updated
- September 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Sep 2026 | 89.8% | 3,841 |
| 29 Sep 2026 | 89.9% | 3,846 |
| 28 Sep 2026 | 90.0% | 3,851 |
| 27 Sep 2026 | 90.2% | 3,857 |
| 26 Sep 2026 | 90.3% | 3,863 |
| 25 Sep 2026 | 90.5% | 3,869 |
| 24 Sep 2026 | 90.6% | 3,874 |
| 23 Sep 2026 | 90.7% | 3,880 |
| 22 Sep 2026 | 90.8% | 3,885 |
| 21 Sep 2026 | 90.9% | 3,890 |
| 20 Sep 2026 | 91.1% | 3,896 |
| 19 Sep 2026 | 91.2% | 3,901 |