What river begins in Lewis and Clark County outside of Missoula, Montana?
Missoula, Montana Missoula is a city in the U.S. state of Montana and is the county seat of Missoula County. It is located along the Clark Fork River near its confluences with the Bitterroot and Blackfoot Rivers in western Montana and at the convergence of five mountain ranges, thus is often described as the "hub of five valleys". In 2016 , the United States Census Bureau estimated the city's population at 72,364 and the population of the Missoula Metropolitan Area at 116,130. In the 1990s, Missoula overtook GreatFalls as Montana’s second‑largest city, behind Billings. Missoula is home to the University of Montana, a public research university.
Glacier County, Montana Glacier County is located in the U.S. state of Montana. As of the 2010 census, the population was 13,399. The county is located in northwestern Montana between the Great Plains and the Rocky Mountains, known to the Blackfeet as the "Backbone of the World". The county is geographically and culturally diverse and includes the Blackfeet Native American Reservation, Glacier National Park, and Lewis and Clark National Forest. The county is bordered by 75 miles of international boundary with two ports of entry (Piegan and Del Bonita) open year-round and one seasonal (Chief Mountain) international border crossing into Alberta, Canada.