The Flathead River rises in forks in the Rocky Mountains of northwestern Montana. The largest tributary is the North Fork, which runs from the Canadian province of British Columbia southwards.

The Flathead River is 219 miles of free-flowing water in northwest Montana that spans an area from the Canadian border to the heart of the Bob Marshall Wilderness. The designated reaches of the …

The Three Forks of the Flathead River contributes 85% of the water flowing into Flathead Lake, the largest natural freshwater lake west of the Mississippi River and is the largest tributary of the …

Flathead River, river rising in the MacDonald Range in southeastern British Columbia, Can., and flowing south for 240 miles (385 km) across the Canada–United States boundary into Montana.

The Flathead River system is a fragile environment of clear mountain streams, vast forests and home of the threatened grizzly bear and bull trout. In 1976 Congress added 219 miles of the Flathead to the …

Detailed Guide to the Flathead River in Northwest Montana. Fly Fishing information, floating information and more than thirty photographs showcase this gorgeous river in Montana.

The Flathead River, in the northwestern part of Montana, originates in the Rocky Mountains near Glacier National Park and flows southwest into Flathead Lake, then after a journey of 158 miles (254 km), …

Dec 7, 2025 · The Flathead River is a major river in the northwestern United States, flowing through the Canadian province of British Columbia and the U.S. state of Montana. It is a popular destination for …

Feb 27, 2023 · The Flathead River in Montana has large and swift drainage that runs from and through a few major northwest regions of the state. The river starts out past Glacier National Park up in the …

The Flathead River begins at the confluence of the North and Middle Forks, just south of Glacier National Park. It flows a total of roughly 160 river miles, into and out of Flathead Lake, and to its …