The largest wave in Montana!!! Make sure to hit the scout spot river left after eagle. There are two main channels here divided by a large rock island the best hits and safest line is always Left channel, it is highly advisable to not run right channel. The rapid is broken up into 2 sections there is Upper Buff which spans half the river and usually stands 6-10 feet tall depending on surges then the river moves left and banks right into Lower Buff, this wave can be up to 14 feet tall depending on surges with a decent flip chance. low water levels Lower Buff becomes more of a hole so be careful with it. Higher water levels Upper Buff can disappear that is usually 30,000+