Yep - good chance the rivers will be blown so I'd focus on finding still water like Hebgen. Bozeman, West Y.S. and Jackson all have numerous flyshops - call em' for advice and good flies to use. For gear, a 9' 5 wt medium action setup. Floating line with lots of leaders (2 - 5x 7-9 ft.). Bring casting bubbles for your spin rod and run a 6' leader to a Wooly Bugger. Cast as far out into the lake as you can and reel so slowly the bubble doesn't leave a wake. PM me if you more and deeper details.