After the town of Clark Fork, ID it then enters the Clark Fork River Valley following the Clark Fork River and ends at the Montana border just before Heron, MT where it becomes Montana Highway 200.
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The Purcell Lobe of the Cordilleran Ice Sheet flowed south from Canada, carving the basin of present-day Lake Pend Oreille and damming the Clark Fork river.
Other than the Columbia and Kootenay Rivers, whose valleys form the bottomlands of the Rocky Mountain Trench, also included in the regional district are the northernmost parts of the basins of the Flathead, Moyie and Yahk Rivers (the Moyie and Yahk are tributaries of the Kootenay, entering it in the United States, and the Flathead is a tributary of the Clark Fork in Montana).
Clark Fork Junior/Senior High School, Clark Fork, Idaho - seen as a yellow cougar with a spiked ball on its tail.
It runs for about 75 miles (121 km) south-to-north through the Bitterroot Valley, from the confluence of its West and East forks near Conner to the Clark Fork near Missoula.
At the Jocko River confluence it turns west, and a few miles after flows into the Clark Fork near Paradise.