Take Highway 20 West from Winthrop Washington until you get to the Ross Lake Resport Trail Head. Hike approx. 1 mile down to the lake, take the shuttle to the Resort, and then either hike or paddle to Big Beaver. It is 4 miles by water or 7 by land.
Wonderful area. The area around Beaver Creek is a temperate rain forest with glaciers on several of the peaks around the area. Good wildlife photo opportunities as well as landscape.