Rogue River OR

Gorgeous place on the Upper Rogue River. Very calm in places, and very violent in others. Great rapids, except it's too narrow (at this place) to raft. September 2010. Digital camera. 

The river has cut itself a deep water way, which funnels the river into a narrower, faster moving body of water at the bottom. The faster water movement in turn erodes the canyon deeper, and the cycle goes on-it's a self-perpetuating system. Thus, the river gets more violent and powerful every year.