Near Dillon, the Beaverhead River is known for plenty of large rainbow and brown trout. You can expect to land fish over 18 inches.
The Beaverhead River has a very brushy shoreline, but this tailwater fishery from Clark Canyon Reservoir is work the effort.
The Beaverhead river is about 50 miles long and it extends down to the confluence with the Big Hole River. The most popular section is the 12 mile upper section from the reservoir to Barretts Diversion Dam. It is an extremely challenging section for fly-fishermen; poor floating, plenty of overhangs and brushy banks. There are plenty of large rainbow trout and big brown trout. Access is provided off US15 for fly fishing on the Beaverhead River.
Overall, Beaverhead River is the 15th most popular fly fishing river of all 21 fly fishing spots in Montana.