The river's headwaters lie in the Bob Marshall Wilderness at the confluence of two small streams, Strawberry Creek and Bowl Creek.[3] From there, it runs north, receiving many tributaries from glacial valleys to the east and west, most of them inside Glacier National Park. The river begins to parallel U.S. Highway 2 as it winds north-northwest, and after a long and narrow course, the river enters a wider valley and begins to spread out and braid between meadows and forested slopes. It then enters another narrow gorge, turning generally westwards, then passing the southwestern entrance of the national park, receives a tributary from Lake McDonald, a large glacial lake to the north, from the right. The river then proceeds southwest to meet the North Fork Flathead River, southwest of West Glacier and northeast of Columbia Falls, forming the main stem of the Flathead River, which eventually flows into the Clark Fork River (the Pend Oreille River).[4]
Tributaries
The following minor creeks are tributaries to the Middle Fork Flathead River:
^Woessner, William; Potts, Donald F.; Running, Steven W.; Kimball, John S.; DeLuca, Thomas H.; Fagre, Daniel B.; Makepeace, Seth; Hendrix, Marc S.; Johnnie, N. Moore; Lorang, Mark S.; Ellis, Bonnie K. (30 July 2004). "Flathead River Basin Hydrologic Observatory, Northern Rocky Mountains"(PDF). Consortium of Universities for the Advancement of Hydrologic Science. www.cuahsi.org. Archived from the original(PDF) on 27 June 2006. Retrieved 2009-08-29.