Fort Union Trading Post National Historic Site 
15550 Hwy 1804
Williston, MT 58801
701 572 9083
http://www.nps.gov/fous
National Park: Birding, Fish, Hike, History, Picnic, Walk, Water Sports
In it’s heyday, the post was a busy place and employed up to 100 people. It became the headquarters for trading buffalo hides and other furs with the Assiniboine, Crow, Cree, Ojibway, Blackfeet, and Hidatsa Tribes.