Reservoir · Montana · United States · USACE CWMS
Canyon Ferry Dam & Reservoir
76.6% full
Capacity
2,401.59 hm³
Volume stored
1839 hm³
Vs month average
99% of normal
Coordinates
46.648°N, 111.729°W
Last updated
2026-10-27
Current fill
76.6%vs 7 days ago
+0.5 ppgaining
vs 1 year ago
+3.3 ppyear-over-year
7-day trend
→stable
Drought context
Storage vs October average
99%of normal
76.6% full on 2026-10-27, against an average of 77.2% for October across 6 years of readings (-0.6 points).
Drought Monitor at this site · 20 October 2026
Nonenot in a drought category
Canyon Ferry Dam & 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: 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: 2026-10-27.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 46.648°N, 111.729°W · Open in Google Maps
About Canyon Ferry Dam & Reservoir
As of October 27, 2026, Canyon Ferry Dam & Reservoir is filled to 76.6% of its total capacity, holding 1,839 hm³ of water out of a maximum 2,402 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has held broadly steady (+0.5 pp), and it is 3.3 points above its level on the same date a year earlier.
Across the readings we hold for Canyon Ferry Dam & Reservoir — 1821 data points between October 29, 2021 and October 27, 2026 — the level has ranged from a low of 64.6% (February 27, 2022) to a high of 97.3% (July 9, 2022). On average the reservoir is fullest around July and at its lowest around February.
It is operated by USACE primarily for multiple purposes. It is at 46.648°N, 111.729°W.
Key facts
- Current fill level
- 76.6% of total capacity
- Water stored
- 1,839 hm³
- Total capacity
- 2,402 hm³
- 7-day change
- ▲ 0.5 pp
- Year-on-year
- ▲ 3.3 pp
- Primary use
- Multipurpose
- Operator
- USACE
- Coordinates
- 46.648°N, 111.729°W
- Last updated
- October 27, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 27 Oct 2026 | 76.6% | 1,839 |
| 26 Oct 2026 | 76.5% | 1,836 |
| 25 Oct 2026 | 76.4% | 1,835 |
| 24 Oct 2026 | 76.4% | 1,834 |
| 23 Oct 2026 | 76.2% | 1,830 |
| 22 Oct 2026 | 76.2% | 1,830 |
| 21 Oct 2026 | 76.1% | 1,829 |
| 20 Oct 2026 | 76.1% | 1,827 |
| 19 Oct 2026 | 76.1% | 1,827 |
| 18 Oct 2026 | 76.0% | 1,826 |
| 17 Oct 2026 | 76.1% | 1,827 |
| 16 Oct 2026 | 76.1% | 1,827 |