In my area the July/ August fish will take a small egg pattern drifted through deep clear pools. The clearer the water the smaller the pattern, three sixteenths of an inch up to three eights inch light pink or peach with a small red spot. Late September through to early November simple white Marabou fly one inch to 2 inhces in length. Early summer fish can weigh up to 35 pounds but it is not a large run, the later Fall run is many times more plentiful with an average size of 20 to 25 pounds with a good number of fish into the 40' and 50's.
Getting the fish to take the fly is not the biggest problem it is getting the fly right in front of the fish in deep fast running water.