WMass and others
every fall, late Sept-Oct, FAOL has a FishIn based right there in Lowell, where the Selway and Lochsa combine to form the Clearwater. This is the optimum time to ffish the October Caddis, which is about the size of a Western Salmon Fly. After a summer of midging and Tricoing and anting here in PA, it's a relief to use 4-6wts instead of 0-3 wts, and 5 or 6X instead of 7-12X, and actually cast flies you can actually see.
As WMass noted, the waters are gin clear - maybe even vodka clear. The West Slope cutts move up into the entirety of the rivers after the summer heat leaves, and a lot of the ffishing is by sight. It's a hoot to watch a cutt come up several feet through the water to slam a #6 October Caddis.
This weeklong thang is open to anyone who is ffishing, and there is room at the Three Rivers Lodge.
I fly in through Missoula, which has more virtues than Bozeman with the Bitterroot and Clark Fork (right in town, even), Rock Creek, Blackfoot and others within 30-40 minutes.
tl
les