sentences:  Below the West Fork confluence, the Yaak River receives the South Fork Yaak River before curving broadly west, then south, receiving numerous tributary creeks such as Spread Creek, Hellroaring Creek, and Burnt Creek (also called Burnt Grizzly Bear Creek), before flowing into the Kootenai River near Yaak Mountain and the small city of Troy, Montana.In Montana, the Yaak River and its tributaries mostly lie within Kootenai National Forest.The river has Class IV-V whitewater.