The Beaverhead River is one of the premier trout fishing rivers in Montana. The Beaverhead produces large trout, particularly Rainbow and Brown trout, and with more than 4000 fish per mile the fishing on this tail water is second to none. The Beaverhead River begins at Clark Canyon Dam, near Dillon, and flows for 80 miles to the confluence with the Jefferson River. The first sixteen miles between Clark Canyon Dam and Barrett’s Dam are the most productive, the river flows through arid hillsides. Traversing this section of river, the Beaverhead is rarely in a straight line for long, as it constantly winds and twists its way through the hills. The banks of the Beaverhead River are lined with willows, cottonwood trees and grass making this a very technical river. The willows cover the undercut banks where the big fish hide dry fly placement is critical but the prize is well worth the effort. Nymphing on the Beaverhead river is very productive when you are rigged properly.