Reservoir · Wyoming · United States · USACE CWMS
Pilot Butte Reservoir, WY
85.0% full
Capacity
41.57 hm³
Volume stored
35 hm³
Coordinates
43.196°N, 108.756°W
Last updated
2026-07-29
Current fill
85.0%vs 7 days ago
+0.9%gaining
vs 1 year ago
+12.8%year-over-year
7-day trend
→stable
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: 2026-07-29.
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, WY
As of July 29, 2026, Pilot Butte Reservoir, WY is filled to 85.0% of its total capacity, holding roughly 35 hm³ of water out of a maximum 42 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (+0.9 pts), and it is 12.8 points above its level on the same date a year earlier.
Across the readings we hold for Pilot Butte Reservoir, WY — 1811 data points between July 31, 2021 and July 29, 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
- 85.0%
- Water stored
- 35 hm³
- Total capacity
- 42 hm³
- 7-day change
- ▲ 0.9 pts
- Year-on-year
- ▲ 12.8 pts
- Primary use
- Multipurpose
- River basin
- Wyoming
- Operator
- USACE
- Coordinates
- 43.196°N, 108.756°W
- Last updated
- July 29, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 29 Jul 2026 | 85.0% | 35 |
| 28 Jul 2026 | 84.1% | 35 |
| 27 Jul 2026 | 83.5% | 35 |
| 26 Jul 2026 | 83.7% | 35 |
| 25 Jul 2026 | 84.0% | 35 |
| 24 Jul 2026 | 83.6% | 35 |
| 23 Jul 2026 | 82.9% | 34 |
| 22 Jul 2026 | 83.0% | 35 |
| 21 Jul 2026 | 83.0% | 35 |
| 20 Jul 2026 | 83.5% | 35 |
| 19 Jul 2026 | 83.6% | 35 |
| 18 Jul 2026 | 83.8% | 35 |
Frequently asked questions
What is the current water level of Pilot Butte Reservoir, WY?
As of July 29, 2026, Pilot Butte Reservoir, WY is at 85.0% of its capacity, holding approximately 35 hm³ of water, according to USACE CWMS (US Army Corps of Engineers) data.
Is Pilot Butte Reservoir, WY reservoir full?
No. As of July 29, 2026, Pilot Butte Reservoir, WY is high at 85.0% of its capacity, so it is not full.
Is the water level at Pilot Butte Reservoir, WY rising or falling?
The level at Pilot Butte Reservoir, WY has been broadly stable over the latest week on record (+0.9 points).
How much water can Pilot Butte Reservoir, WY hold?
Pilot Butte Reservoir, WY has a total capacity of 42 hm³.
Where is Pilot Butte Reservoir, WY reservoir located?
Pilot Butte Reservoir, WY is located in Wyoming, United States, within the Wyoming basin (coordinates 43.196°N, 108.756°W).
What is Pilot Butte Reservoir, WY used for?
Pilot Butte Reservoir, WY is used primarily for multiple purposes, and is managed by USACE.