We spend a week south of Bigfork every September. I fish the Swan and the north fork of the Flathead. The Swan is especially wadeing friendly, with lots of cutthroat action. Beautiful scenery and not busy at all, especially in September.
Stop in at Bigfork Anglers Flyshop for a report when you get there. Great people and a great shop.
Have fun and let us know how you make out.
Pyke.