Lake Koocanusa Water Level Today
Montana · near Libby · Below full pool
- Elevation
- 2,444.76 ft
- From full pool
- −14.24 ft
- Percent of pool
- 91.7%
- 24-hour change
- −0.05 ft
- 7-day change
- −0.32 ft
- Reading
- Sep 21, 2026 · USACE
Last year at Lake Koocanusa
Lake Koocanusa is 14.24 ft below full pool, at 2,444.76 ft, down 0.05 ft in the last 24 hours. That puts the lake at 91.7 percent of its conservation pool. The top of the flood pool is 14.2 ft higher, at 2,459.00 ft.
Over the last 7 days the level fell 0.32 ft, and over 30 days it fell 2.44 ft. In the 398 days of readings on this page the high was 2,449.49 ft on Aug 18, 2025 and the low was 2,369.43 ft on Apr 23, 2026, a range of 80.06 ft.
The reading is the U.S. Army Corps of Engineers gauge at LIBBY DAM, near Libby, taken Sep 21, 2026 and referenced to the NGVD29 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.
Lake Koocanusa pool elevations
| Current elevation | 2,444.76 ft |
|---|---|
| Full pool (top of conservation) | 2,459.00 ft |
| Top of flood pool | 2,459.00 ft |
| Bottom of conservation pool | 2,287.00 ft |
| Top of dam | 2,472.00 ft |
| Inflow | 4,960 cfs |
| Outflow | 6,500 cfs |
| 30-day change | −2.44 ft |
| 1-year high | 2,449.49 ft (Aug 18, 2025) |
| 1-year low | 2,369.43 ft (Apr 23, 2026) |
| Vertical datum | NGVD29 |
| Operating agency | U.S. Army Corps of Engineers, NWS district |
Source: U.S. Army Corps of Engineers. Read what full pool and flood pool mean.
More lakes in Montana
- Fort Peck Lake 2,222.45 ft, −11.55 ft from full
- Canyon Ferry Reservoir 3,785.41 ft, −11.59 ft from full
- Clark Canyon Reservoir 5,514.74 ft, −31.36 ft from full
- Flathead Lake 2,893.05 ft, +0.05 ft from full
- Tiber Reservoir 2,988.17 ft, −4.83 ft from full
- Yellowtail Reservoir 3,623.41 ft, −16.59 ft from full
Lake Koocanusa level questions
What is the water level of Lake Koocanusa today?
Lake Koocanusa is at 2,444.76 ft as of Sep 21, 2026, −14.24 ft relative to full pool (2,459.00 ft). The 24-hour change is −0.05 ft.
What is full pool at Lake Koocanusa?
Full pool, the top of the conservation pool, is 2,459.00 ft (NGVD29). Above that, water is stored temporarily in the flood pool up to 2,459.00 ft. The bottom of the conservation pool is 2,287.00 ft.
Is Lake Koocanusa rising or falling?
Over the last 24 hours the level is −0.05 ft; over 7 days it fell 0.32 ft, and over 30 days it fell 2.44 ft.
Where does this Lake Koocanusa level come from?
From the U.S. Army Corps of Engineers (USACE) public data feed for LIBBY DAM. Lake Levels Today republishes the agency's daily value without adjustment and links to the source below.