Derssc, First let me say welcome to FAOL from So Cal. You've found a good FF site in this one. I was in GNP last summer but did not fish, just hiked. If you are going in from the west just about any of the towns along the park border have guides and fly shops for info. Kalispell, Columbia Falls or Hungry Horse comes to mind. The flathead, if its not running too high from meltoff should have some good fishing. I'd check with the locals where you're gonna stay before you go. Good luck. Jim