I assumed that fly fishing = trout (at least, at this time of the year). The Long Tom has rainbow, and cutthroat, trout above Fern Ridge. Below the dam, it's a cuttie and warm water fishery (smallies, bucketmouths, crappie, 'gills, cats, and carp). The Willy also has all of the above, in various locations. The Mary's is almost exclusively a trout show.