Salmonflies emerge over a 100-mile stretch of the Yellowstone, from below Livingston all the way up into Black’s Canyon inside Yellowstone National Park. Compared to most rivers, the progression of the flies is fairly predictable, but water conditions aren’t. During high-runoff years, the river can be too muddy to fish until after July 4. Local Pattern: Orange Madam X Contact: Anderson’s Yellowstone Angler in Livingston, 406-222-7130