Reservoir · Wyoming · United States · USACE CWMS
Pilot Butte Reservoir
74.4% full
Capacity
41.57 hm³
Volume stored
31 hm³
Coordinates
43.196°N, 108.756°W
Last updated
2026-09-10
Current fill
74.4%vs 7 days ago
-2.0%losing
vs 1 year ago
+34.3%year-over-year
7-day trend
↓falling
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: 2026-09-10.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 43.196, -108.756 · Open in Google Maps
About Pilot Butte Reservoir
As of September 10, 2026, Pilot Butte Reservoir is filled to 74.4% of its total capacity, holding roughly 31 hm³ of water out of a maximum 42 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has fallen by 2.0 percentage points, and it is 34.3 points above its level on the same date a year earlier.
Across the readings we hold for Pilot Butte Reservoir — 1811 data points between September 12, 2021 and September 10, 2026 — the level has ranged from a low of 16.4% (September 26, 2021) to a high of 90.0% (June 17, 2025). On average the reservoir is fullest around April and at its lowest around September.
It is operated by USACE primarily for multiple purposes. It lies within the Wyoming basin at 43.196°N, 108.756°W.
Key facts
- Current fill level
- 74.4%
- Water stored
- 31 hm³
- Total capacity
- 42 hm³
- 7-day change
- ▼ 2.0 pts
- Year-on-year
- ▲ 34.3 pts
- Primary use
- Multipurpose
- River basin
- Wyoming
- Operator
- USACE
- Coordinates
- 43.196°N, 108.756°W
- Last updated
- September 10, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 10 Sep 2026 | 74.4% | 31 |
| 9 Sep 2026 | 74.7% | 31 |
| 8 Sep 2026 | 74.7% | 31 |
| 7 Sep 2026 | 75.1% | 31 |
| 6 Sep 2026 | 75.5% | 31 |
| 5 Sep 2026 | 75.7% | 31 |
| 4 Sep 2026 | 75.8% | 32 |
| 3 Sep 2026 | 76.4% | 32 |
| 2 Sep 2026 | 76.4% | 32 |
| 1 Sep 2026 | 76.5% | 32 |
| 31 Aug 2026 | 76.8% | 32 |
| 30 Aug 2026 | 76.9% | 32 |