This is the smallest of the salmonfly rivers-with bugs that rival hummingbirds in size. The hatch progresses from the mouth, where Rock Creek empties into the Clark’s Fork River, up through a wilderness section paralleled by a potholed gravel road. It takes an alert oarsman to negotiate Rock Creek’s tight turns and stream hazards, which include fallen trees that can dam the river from bank to bank. The trout are on the smallish side, but there are plenty of them. Local Pattern: Gould’s Half-Down Salmonfly Contact: Grizzly Hackle International in Missoula, 406-721-8996