Reservoir · Montana · United States · BOR RISE
Fresno Reservoir
Fresno Reservoir and Dam
43.6% full
Capacity
159.2 hm³
Volume stored
69 hm³
Vs month average
162% of normal
Coordinates
48.608°N, 109.946°W
Last updated
2026-10-27
Current fill
43.6%vs 7 days ago
+0.3 ppgaining
vs 1 year ago
+17.3 ppyear-over-year
7-day trend
→stable
Drought context
Storage vs October average
162%of normal
43.6% full on 2026-10-27, against an average of 26.9% for October across 6 years of readings (+16.7 points).
Drought Monitor at this site · 20 October 2026
Nonenot in a drought category
Fresno 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: 2026-10-27.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 48.608°N, 109.946°W · Open in Google Maps
About Fresno Reservoir
As of October 27, 2026, Fresno Reservoir is filled to 43.6% of its total capacity, holding 69.42 hm³ of water out of a maximum 159.2 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 (+0.3 pp), and it is 17.3 points above its level on the same date a year earlier.
Across the readings we hold for Fresno Reservoir — 1953 data points between October 29, 2021 and October 27, 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 is at 48.608°N, 109.946°W.
Key facts
- Current fill level
- 43.6% of total capacity
- Water stored
- 69.42 hm³
- Total capacity
- 159.2 hm³
- 7-day change
- ▲ 0.3 pp
- Year-on-year
- ▲ 17.3 pp
- Primary use
- Multipurpose
- Operator
- BOR
- Coordinates
- 48.608°N, 109.946°W
- Last updated
- October 27, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 27 Oct 2026 | 43.6% | 69.42 |
| 26 Oct 2026 | 43.5% | 69.24 |
| 25 Oct 2026 | 43.4% | 69.16 |
| 24 Oct 2026 | 43.4% | 69.13 |
| 23 Oct 2026 | 43.4% | 69.13 |
| 22 Oct 2026 | 43.3% | 68.98 |
| 21 Oct 2026 | 43.3% | 68.98 |
| 20 Oct 2026 | 43.3% | 68.98 |
| 19 Oct 2026 | 43.4% | 69.02 |
| 18 Oct 2026 | 43.3% | 68.98 |
| 17 Oct 2026 | 43.4% | 69.02 |
| 16 Oct 2026 | 43.4% | 69.02 |