Reservoir · Montana · United States · BOR RISE
Hungry Horse Reservoir
Hungry Horse Reservoir, Dam, and Powerplant
88.3% full
Capacity
4,277.72 hm³
Volume stored
3776 hm³
Vs month average
100% of normal
Coordinates
48.341°N, 114.014°W
Last updated
2026-10-14
Current fill
88.3%vs 7 days ago
-0.6%losing
vs 1 year ago
-1.2%year-over-year
7-day trend
→stable
Drought context
Storage vs October average
100%of normal
88.3% full on 2026-10-14, against an average of 88.6% for October across 6 years of readings (-0.3 points).
Drought Monitor at this site · 13 October 2026
Nonenot in a drought category
Hungry Horse Reservoir's coordinates fall outside every category on the weekly U.S. Drought Monitor map. That describes local conditions — rainfall, soil moisture, streamflow — not the reservoir's storage. Montana drought figures →
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: 2026-10-14.
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 October 14, 2026, Hungry Horse Reservoir is filled to 88.3% of its total capacity, holding roughly 3,776 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 (-0.6 pts), and it is 1.2 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 16, 2021 and October 14, 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
- 88.3%
- Water stored
- 3,776 hm³
- Total capacity
- 4,278 hm³
- 7-day change
- ▼ 0.6 pts
- Year-on-year
- ▼ 1.2 pts
- Primary use
- Multipurpose
- River basin
- Montana
- Operator
- BOR
- Coordinates
- 48.341°N, 114.014°W
- Last updated
- October 14, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 14 Oct 2026 | 88.3% | 3,776 |
| 13 Oct 2026 | 88.4% | 3,780 |
| 12 Oct 2026 | 88.4% | 3,784 |
| 11 Oct 2026 | 88.6% | 3,789 |
| 10 Oct 2026 | 88.7% | 3,792 |
| 9 Oct 2026 | 88.7% | 3,796 |
| 8 Oct 2026 | 88.9% | 3,801 |
| 7 Oct 2026 | 88.9% | 3,804 |
| 6 Oct 2026 | 89.0% | 3,808 |
| 5 Oct 2026 | 89.1% | 3,812 |
| 4 Oct 2026 | 89.3% | 3,818 |
| 3 Oct 2026 | 89.4% | 3,824 |