Note the massive rockslide on the left, shortly after the powerline crosses the river. This marks Slide Rapids, which ranges from barely a riffle at flows under 10,000 cfs to Class V-VI at flows of 20,000 cfs and higher. In very high water, these are the most dangerous rapids on the Lower Salmon River and unrunnable. These rapids cannot be lined or portaged without great difficulty. 

Scouting is mandatory and quite hard.