Reservoir · Montana · United States · BOR RISE
Fresno Reservoir
Fresno Reservoir and Dam
27.9% full
Capacity
159.2 hm³
Volume stored
44 hm³
Coordinates
48.608°N, 109.946°W
Last updated
2026-09-09
Current fill
27.9%vs 7 days ago
+5.7%gaining
vs 1 year ago
-2.1%year-over-year
7-day trend
↑rising
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: 2026-09-09.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 48.608, -109.946 · Open in Google Maps
About Fresno Reservoir
As of September 9, 2026, Fresno Reservoir is filled to 27.9% of its total capacity, holding roughly 44 hm³ of water out of a maximum 159 hm³. At this level the reservoir is low.
Over the most recent week on record the fill level has risen by 5.7 percentage points, and it is 2.1 points below its level on the same date a year earlier.
Across the readings we hold for Fresno Reservoir — 1952 data points between September 12, 2021 and September 9, 2026 — the level has ranged from a low of 6.0% (July 5, 2025) to a high of 71.2% (May 8, 2023). On average the reservoir is fullest around May and at its lowest around February.
It is operated by BOR primarily for multiple purposes. It lies within the Montana basin at 48.608°N, 109.946°W.
Key facts
- Current fill level
- 27.9%
- Water stored
- 44 hm³
- Total capacity
- 159 hm³
- 7-day change
- ▲ 5.7 pts
- Year-on-year
- ▼ 2.1 pts
- Primary use
- Multipurpose
- River basin
- Montana
- Operator
- BOR
- Coordinates
- 48.608°N, 109.946°W
- Last updated
- September 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Sep 2026 | 27.9% | 44 |
| 8 Sep 2026 | 26.7% | 43 |
| 7 Sep 2026 | 25.6% | 41 |
| 6 Sep 2026 | 24.8% | 39 |
| 5 Sep 2026 | 24.1% | 38 |
| 4 Sep 2026 | 23.5% | 37 |
| 3 Sep 2026 | 22.8% | 36 |
| 2 Sep 2026 | 22.2% | 35 |
| 1 Sep 2026 | 21.7% | 35 |
| 31 Aug 2026 | 21.2% | 34 |
| 30 Aug 2026 | 20.9% | 33 |
| 29 Aug 2026 | 20.7% | 33 |