There is good surface activity in the shallows as well. Rising fish will take a Parachute Adams in a 14 or 16. Also try a larger Griffith's Gnat or a stimulator with a bead head hare's ear on the back. Or fish a size 12 stimulator with a jumbo lake midge larvae, an effective trailer, hung 30 inches off the back. For the cutthroat, fish over open water with fast sinking lines and crystal killers, buggers and other leech patterns.
Streamers work when the light is low.
Most fish will take a parachute hopper fished high and dry. Don't fish in the meadow section with all those dandies from Connecticut just learning how to cast. Fish the stretch between Biscuit Basin and the meadows. Both the stream and the lake are productive right now. Damselfly nymphs, crystal patterns and white crystal Buggers will take the cutthroat up here.