Below Libby Dam the river, now known as the Kootenai, forms the Big Bend around the south side of the Purcell Mountains. It receives the Fisher River from the south and turns west, passing Libby, Montana. About below Libby it drops over Kootenai Falls. The river turns northwest at Troy, and the Yaak River and Moyie River (both originating in BC) join from the north, the latter near Moyie Springs, Idaho. In Idaho the river enters the gentle terrain of the Kootenai Valley, turning north at Bonners Ferry