Reservoir · Wyoming · United States · USACE CWMS
Pilot Butte Reservoir
83.4% full
Capacity
41.57 hm³
Volume stored
35 hm³
Vs month average
117% of normal
Coordinates
43.196°N, 108.756°W
Last updated
2026-10-27
Current fill
83.4%vs 7 days ago
-0.2 pplosing
vs 1 year ago
-5.1 ppyear-over-year
7-day trend
→stable
Drought context
Storage vs October average
117%of normal
83.4% full on 2026-10-27, against an average of 71.5% for October across 6 years of readings (+11.9 points).
Drought Monitor at this site · 20 October 2026
D2severe drought
The ground at Pilot Butte Reservoir's coordinates falls inside the D2 area of the weekly U.S. Drought Monitor map. That describes local conditions — rainfall, soil moisture, streamflow — not the reservoir's storage. Wyoming drought figures →
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: 2026-10-27.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 43.196°N, 108.756°W · Open in Google Maps
About Pilot Butte Reservoir
As of October 27, 2026, Pilot Butte Reservoir is filled to 83.4% of its total capacity, holding 34.67 hm³ of water out of a maximum 41.57 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (-0.2 pp), and it is 5.1 points below its level on the same date a year earlier.
Across the readings we hold for Pilot Butte Reservoir — 1811 data points between October 29, 2021 and October 27, 2026 — the level has ranged from a low of 16.4% (October 29, 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 is at 43.196°N, 108.756°W.
Key facts
- Current fill level
- 83.4% of total capacity
- Water stored
- 34.67 hm³
- Total capacity
- 41.57 hm³
- 7-day change
- ▼ 0.2 pp
- Year-on-year
- ▼ 5.1 pp
- Primary use
- Multipurpose
- Operator
- USACE
- Coordinates
- 43.196°N, 108.756°W
- Last updated
- October 27, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 27 Oct 2026 | 83.4% | 34.67 |
| 26 Oct 2026 | 83.4% | 34.66 |
| 25 Oct 2026 | 83.4% | 34.67 |
| 24 Oct 2026 | 83.4% | 34.69 |
| 23 Oct 2026 | 83.5% | 34.71 |
| 22 Oct 2026 | 83.5% | 34.72 |
| 21 Oct 2026 | 83.5% | 34.73 |
| 20 Oct 2026 | 83.6% | 34.74 |
| 19 Oct 2026 | 83.6% | 34.77 |
| 18 Oct 2026 | 83.7% | 34.79 |
| 17 Oct 2026 | 83.7% | 34.79 |
| 16 Oct 2026 | 83.7% | 34.8 |