Any stream you choose to fish in the Park, this is the season when terrestrial insect patterns should be in your fly box. Dry ant, beetle, cranefly, cricket, hopper, and sprucefly patterns fished near overhead cover, especially adjacent to deep water are the names of the game. Consider that the days are getting shorter meaning that it takes water and surroundings a bit longer to heat up for insects, then fish to become active. So concentrate your fishing efforts with these patterns into the afternoons. Fastest action currently in the Park, you ask? For moving water try Boundary, Obsidian, Soda Butte, or Slough Creeks. For still waters try either Beula or Riddle Lakes.