Reservoir · Montana · United States · BOR RISE
Clark Canyon Reservoir and Dam
35.3% full
Capacity
219.64 hm³
Volume stored
78 hm³
Coordinates
45.002°N, 112.858°W
Last updated
2026-07-28
Current fill
35.3%vs 7 days ago
-0.3%losing
vs 1 year ago
-14.4%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: 2026-07-28.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 45.002, -112.858 · Open in Google Maps
About Clark Canyon Reservoir and Dam
As of July 28, 2026, Clark Canyon Reservoir and Dam is filled to 35.3% of its total capacity, holding roughly 78 hm³ of water out of a maximum 220 hm³. At this level the reservoir is low.
Over the most recent week on record the fill level has held broadly steady (-0.3 pts), and it is 14.4 points below its level on the same date a year earlier.
Across the readings we hold for Clark Canyon Reservoir and Dam — 1825 data points between July 31, 2021 and July 28, 2026 — the level has ranged from a low of 25.9% (September 5, 2022) to a high of 98.6% (April 10, 2024). On average the reservoir is fullest around May and at its lowest around September.
It is operated by BOR primarily for multiple purposes. It lies within the Montana basin at 45.002°N, 112.858°W.
Key facts
- Current fill level
- 35.3%
- Water stored
- 78 hm³
- Total capacity
- 220 hm³
- 7-day change
- ▼ 0.3 pts
- Year-on-year
- ▼ 14.4 pts
- Primary use
- Multipurpose
- River basin
- Montana
- Operator
- BOR
- Coordinates
- 45.002°N, 112.858°W
- Last updated
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 35.3% | 78 |
| 27 Jul 2026 | 35.6% | 78 |
| 26 Jul 2026 | 35.9% | 79 |
| 25 Jul 2026 | 36.2% | 80 |
| 24 Jul 2026 | 36.5% | 80 |
| 23 Jul 2026 | 36.8% | 81 |
| 22 Jul 2026 | 37.1% | 81 |
| 21 Jul 2026 | 37.3% | 82 |
| 20 Jul 2026 | 37.6% | 83 |
| 19 Jul 2026 | 38.0% | 84 |
| 18 Jul 2026 | 38.4% | 84 |
| 17 Jul 2026 | 38.7% | 85 |
Frequently asked questions
What is the current water level of Clark Canyon Reservoir and Dam?
As of July 28, 2026, Clark Canyon Reservoir and Dam is at 35.3% of its capacity, holding approximately 78 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Clark Canyon Reservoir and Dam reservoir full?
No. As of July 28, 2026, Clark Canyon Reservoir and Dam is low at 35.3% of its capacity, so it is not full.
Is the water level at Clark Canyon Reservoir and Dam rising or falling?
The level at Clark Canyon Reservoir and Dam has been broadly stable over the latest week on record (-0.3 points).
How much water can Clark Canyon Reservoir and Dam hold?
Clark Canyon Reservoir and Dam has a total capacity of 220 hm³.
Where is Clark Canyon Reservoir and Dam reservoir located?
Clark Canyon Reservoir and Dam is located in Montana, United States, within the Montana basin (coordinates 45.002°N, 112.858°W).
What is Clark Canyon Reservoir and Dam used for?
Clark Canyon Reservoir and Dam is used primarily for multiple purposes, and is managed by BOR.