Keyhole Reservoir Water Level Today
Wyoming · near Gillette · Below full pool
- Elevation
- 4,084.03 ft
- From full pool
- −15.27 ft
- Percent of pool
- 68.4%
- 24-hour change
- no change
- 7-day change
- −0.08 ft
- Reading
- Sep 21, 2026 · USACE
Last year at Keyhole Reservoir
Keyhole Reservoir is 15.27 ft below full pool, at 4,084.03 ft, holding steady over the last 24 hours. That puts the lake at 68.4 percent of its conservation pool. The top of the flood pool is 27.5 ft higher, at 4,111.50 ft.
Over the last 7 days the level fell 0.08 ft, and over 30 days it fell 0.86 ft. In the 400 days of readings on this page the high was 4,089.91 ft on Aug 18, 2025 and the low was 4,084.00 ft on Sep 17, 2026, a range of 5.91 ft.
The reading is the U.S. Army Corps of Engineers gauge at Keyhole Dam & Reservoir, near Gillette, taken Sep 21, 2026 and referenced to the LOCAL datum. This page is rebuilt once a day from the agency feed; it is not a live gauge, so during a fast rise or a scheduled release check the USACE page for hourly values.
Keyhole Reservoir pool elevations
| Current elevation | 4,084.03 ft |
|---|---|
| Full pool (top of conservation) | 4,099.30 ft |
| Top of flood pool | 4,111.50 ft |
| Bottom of conservation pool | 4,051.00 ft |
| Top of dam | 4,134.00 ft |
| Inflow | 0 cfs |
| Outflow | 0 cfs |
| 30-day change | −0.86 ft |
| 1-year high | 4,089.91 ft (Aug 18, 2025) |
| 1-year low | 4,084.00 ft (Sep 17, 2026) |
| Vertical datum | LOCAL |
| Operating agency | U.S. Army Corps of Engineers, NWO district |
Source: U.S. Army Corps of Engineers. Read what full pool and flood pool mean.
More lakes in Wyoming
- Jackson Lake 6,734.22 ft, −33.78 ft from full
- Boysen Reservoir 4,709.88 ft, −15.12 ft from full
- Glendo Reservoir 4,591.54 ft, −43.46 ft from full
Keyhole Reservoir level questions
What is the water level of Keyhole Reservoir today?
Keyhole Reservoir is at 4,084.03 ft as of Sep 21, 2026, −15.27 ft relative to full pool (4,099.30 ft). The 24-hour change is no change.
What is full pool at Keyhole Reservoir?
Full pool, the top of the conservation pool, is 4,099.30 ft (LOCAL). Above that, water is stored temporarily in the flood pool up to 4,111.50 ft. The bottom of the conservation pool is 4,051.00 ft.
Is Keyhole Reservoir rising or falling?
Over the last 24 hours the level is no change; over 7 days it fell 0.08 ft, and over 30 days it fell 0.86 ft.
Where does this Keyhole Reservoir level come from?
From the U.S. Army Corps of Engineers (USACE) public data feed for Keyhole Dam & Reservoir. Lake Levels Today republishes the agency's daily value without adjustment and links to the source below.