There is a road by fish creek that fallows the railroad where u can check out the tumbleweed section. Did it once at 35,000 in my 13 foot sotar and it was massive. Rest stop rapid had one of the biggest waves iv seen. The hydrolics in tumble weed section are scary. Once was enough for me. Here's some video of Clark for at med level. The best thing about the Clark fork is the wild life. U will see more wildlife in one day then u will on a 8 day middle fork trip. Only time iv seen a cougar on the river which is odd considering it's right next to the freeway and the rivers more crowded then the lochsa on Memorial Day.