As you may or may not know, Lake Koocanusa is a manmade reservoir that was created 45 years ago (1975) when the Libby Dam was constructed on the Kootenay River in Montana, USA. Lake levels fluctuate throughout the year and are generally highest in July, August and then decrease slightly throughout the fall.
For up-to-date great information on Lake Koocanusa levels, check out these references:
- US National Weather Service – Advanced Hydrologic Prediction Service – Lake Koocanusa
- Info on Libby Dam & Latest Flow Updates from the US Army Corps of Engineers
Koocanusa Campsite & Marina 