Flathead River (South, Middle, and North Forks) Professional Review and Guide
"The Flathead is truly a cosmopolitan river. It flows from a foreign country, Canada, past the Glacier National Park, gathering water from the Bob Marshall and Great Bear Wildernesses, passing through Flathead National Forest, many state lands, private lands, and the Kootenai Nation on its way to the Clark Fork.
Anglers talking about “the Flathead” may be referring either to the magnificent lake, the mighty river that feeds it, or to the big valleys and basin that surround these waters. (Flathead is also the name of a county that is one of the state’s fastest growing, experiencing a flood of new residents.) Together the lake and river make a complete system; the lake supplies many of the fish while the river supplies the spawning grounds and summer feed.
Key species: Cutthroat trout, whitefish, rainbow trout, bull trout, lake trout, and northern pike."