I lived in Missoula for 7 years and I have only been down the lower part of MF of Flathead in a raft, but here are some places to look and call for more info. Everyone out there is really great. Have fun!
CONTACT BOARD OF MISSOULA
618 S. Higgins Ave.
Missoula, Montana 59801
phone: 406-721-7774 fax: 406-721-4258
5. Middle Fork of the Flathead River, Montana. This Class II-IV glacial river rips through the remote Bob Marshall Wilderness from the Canadian border along the western edge of Glacier National Park. Remote and federally protected, it's best run as a multiday trip between early June and mid-July. Call Flathead National Forest, 406-387-5243.