Beaverhead River Professional Review and Guide
"If you believe that good things come in small packages, then you will certainly find a gem in the Beaverhead River. The Beaverhead originates below the Clark Canyon reservoir and twists and turns for more than 80 miles until it merges with the Ruby and then the Big Hole River to form the Jefferson. Although small in stature, the Beaverhead is not lacking for large trout, and in fact has built a reputation as a trophy brown trout fishery.
The Beaverhead has good dry fly fishing, but it is primarily a small nymph river. Types of Fish: Brown and Rainbow Trout, Whitefish. This fly-fishing chapter describes the "where, when, and how" for fishing in this area. It includes a full-page map and information on the known hatches, suggested equipment to use, the best flies to use, season, limits, nearby accommodations, and camping."