Kootenai Falls is a waterfall on the Kootenai River located in Lincoln County, Montana, just off U.S. Route 2. It is the largest undammed waterfall in the state and one of the largest waterfalls in the United States by flow rate. The falls is accessed by a foot trail from the parking area next to the highway. Historically a sacred site to the local Kootenai Tribe, the falls became a popular tourist destination in the 2010s due to the Kootenai Falls Swinging Bridge just downstream.