The Crow Indian Agency was established in Montana Territory by a treaty concluded at Fort Laramie on May 7, 1868. An earlier treaty had been made at Fort Laramie on September 17, 1851, establishing various tribal boundaries in Montana, but had never been ratified formally. The 1868 treaty provided for the construction of an agency complex on the south side of the Yellowstone River near Otter Creek, and the assignment of Indian agents to locally administer tribal affairs and relations with the United States government. Agency headquarters were moved to the Stillwater River near present Absarokee, Montana, in 1875, and in 1884 to its present site on the Little Big Horn River.
From the guide to the Crow Indian Aagency Records, 1877-1894, (Montana Historical Society Archives)
