Yellowstone Park

Terrestrials, particularly ant and hopper patterns, are bringing action on almost all streams. Don't overlook presenting ant patterns on lakes. Carry cinnamon and black patterns of various sizes in order to be ready for which are attracting fish. And remember lakes such as Beula, Cascade and Grebe have great ant flights this time of the season.
Fly Patterns to use:
Bionic Ant 2.0 Brown
CDC Biot Rusty Spinner
Pheasant Tail Flashback