What Montana river was a dam built on under the Columbia River Treaty?
Columbia River Treaty:  Four dams were constructed under this treaty: three in British Columbia, Canada (Duncan Dam, Mica Dam, Keenleyside Dam) and one in Montana in the United States (Libby Dam). Libby Dam: Libby Dam is a dam on the Kootenai River in the U.S. state of Montana.
Kootenai River