It's not traditional, but some small rock worm like fly is killer on steel in cold clear H2O.
Perhaps something tied in a smaller size like a 7 or possibly smaller hook. My only exposure to them proved the fish to be fussy. Saw a guy hit one on a smelt pattern while fishing the St. Marys river, this was in cold clear water.
Whatever happens time in the water sure as hell beats time 6' under the soil.