The Skagit River from Newhalem to Copper Creek flows quickly through a deep canyon in between the high mountains of North Cascades National Park. As expected in a mountain stream, there are numerous riffles, rapids, and rocks to contend with. The largest series of Class 3 rapids is located at the "S-bends" starting at 6.5 miles and continuing for more than half a mile. Spawning salmon are frequently seen in fall and bald eagles in winter.