The Big Fork River has many areas of Class I rapids. There are two waterfalls that may be passed only by the most experienced paddlers; Little American Falls (Class III-IV) and Big Falls.
Scattered small farms break up a forest of pine, spruce, fir, cedar, aspen and birch. The areas of major development are the towns of Bigfork and Big Falls. The geology is clay, silt and sand deposits, in many places less than five feet thick, overlying Precambrian igneous and metamorphic rocks. Most of the watershed was once covered by glacial Lake Agassiz.
Fish and wildlife
The river offers excellent fishing for walleye, northern pike and muskies. Wildlife is abundant including, timber wolves, bobcats, lynx, beavers, otters. Big game includes moose, black bears and white-tailed deer. Birds include bald eagles, osprey, ruffed grouse and several species of ducks.