Reservoir · Montana · United States · USACE CWMS
Fresno Reservoir
42.5% full
Capacity
159.2 hm³
Volume stored
68 hm³
Coordinates
48.601°N, 109.944°W
Last updated
2026-10-01
Current fill
42.5%vs 7 days ago
+3.1%gaining
vs 1 year ago
+14.1%year-over-year
7-day trend
↑rising
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: 2026-10-01.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 48.601, -109.944 · Open in Google Maps
About Fresno Reservoir
As of October 1, 2026, Fresno Reservoir is filled to 42.5% of its total capacity, holding roughly 68 hm³ of water out of a maximum 159 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has risen by 3.1 percentage points, and it is 14.1 points above its level on the same date a year earlier.
Across the readings we hold for Fresno Reservoir — 1822 data points between October 2, 2021 and October 1, 2026 — the level has ranged from a low of 6.0% (July 6, 2025) to a high of 71.2% (May 9, 2023). On average the reservoir is fullest around May and at its lowest around February.
It is operated by USACE primarily for multiple purposes. It lies within the Montana basin at 48.601°N, 109.944°W.
Key facts
- Current fill level
- 42.5%
- Water stored
- 68 hm³
- Total capacity
- 159 hm³
- 7-day change
- ▲ 3.1 pts
- Year-on-year
- ▲ 14.1 pts
- Primary use
- Multipurpose
- River basin
- Montana
- Operator
- USACE
- Coordinates
- 48.601°N, 109.944°W
- Last updated
- October 1, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 1 Oct 2026 | 42.5% | 68 |
| 30 Sep 2026 | 42.3% | 67 |
| 29 Sep 2026 | 42.0% | 67 |
| 28 Sep 2026 | 41.7% | 66 |
| 27 Sep 2026 | 41.1% | 65 |
| 26 Sep 2026 | 40.6% | 65 |
| 25 Sep 2026 | 40.0% | 64 |
| 24 Sep 2026 | 39.4% | 63 |
| 23 Sep 2026 | 38.8% | 62 |
| 22 Sep 2026 | 38.2% | 61 |
| 21 Sep 2026 | 37.6% | 60 |
| 20 Sep 2026 | 36.9% | 59 |