Reservoir · Montana · United States · USACE CWMS
Fort Peck Dam & Reservoir
81.7% full
Capacity
18,995.62 hm³
Volume stored
15518 hm³
Coordinates
48.001°N, 106.418°W
Last updated
2026-09-10
Current fill
81.7%vs 7 days ago
-0.1%losing
vs 1 year ago
-1.2%year-over-year
7-day trend
→stable
Data source: USACE CWMS — US Army Corps of Engineers — 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: 2026-09-10.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 48.001, -106.418 · Open in Google Maps
About Fort Peck Dam & Reservoir
As of September 10, 2026, Fort Peck Dam & Reservoir is filled to 81.7% of its total capacity, holding roughly 15,518 hm³ of water out of a maximum 18,996 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (-0.1 pts), and it is 1.2 points below its level on the same date a year earlier.
Across the readings we hold for Fort Peck Dam & Reservoir — 1821 data points between September 12, 2021 and September 10, 2026 — the level has ranged from a low of 76.7% (March 2, 2023) to a high of 92.8% (May 27, 2024). On average the reservoir is fullest around July and at its lowest around February.
It is operated by USACE primarily for multiple purposes. It lies within the Montana basin at 48.001°N, 106.418°W.
Key facts
- Current fill level
- 81.7%
- Water stored
- 15,518 hm³
- Total capacity
- 18,996 hm³
- 7-day change
- ▼ 0.1 pts
- Year-on-year
- ▼ 1.2 pts
- Primary use
- Multipurpose
- River basin
- Montana
- Operator
- USACE
- Coordinates
- 48.001°N, 106.418°W
- Last updated
- September 10, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 10 Sep 2026 | 81.7% | 15,518 |
| 9 Sep 2026 | 81.7% | 15,522 |
| 8 Sep 2026 | 81.7% | 15,525 |
| 7 Sep 2026 | 81.7% | 15,525 |
| 6 Sep 2026 | 81.8% | 15,530 |
| 5 Sep 2026 | 81.8% | 15,534 |
| 4 Sep 2026 | 81.8% | 15,538 |
| 3 Sep 2026 | 81.8% | 15,543 |
| 2 Sep 2026 | 81.9% | 15,551 |
| 1 Sep 2026 | 81.9% | 15,558 |
| 31 Aug 2026 | 81.9% | 15,564 |
| 30 Aug 2026 | 82.0% | 15,571 |