You can never go wrong with a wooly bugger to start. For nymphs hares ears, pheasant tails,work well. Reliable junk flies are San Juan worms, green weenies, and copper johns (red wire for stockies). If you are looking to match the hatch you may see some brown stoneflies, BWOs, various midges and caddis. Have a great time!
I continue to be puzzled why anyone would want to fish elbow to elbow for stocked fish. I'll be up in the sticks away from the rude, inconsiderate once a year folks who hit the LL each year.