Yellowstone Park

Terrestrial patterns are the name of the game on all streams. Look for green drakes coming to Slough Creek soon. On lakes such as Beula, Riddle, Grebe, Cascade and Wolf speckled duns will make for gulpers.
Fly Patterns to use:
Bionic Ant 2.0 Brown
CDC Biot Rusty Spinner
Pheasant Tail Flashback