Upper Missouri Agency
- Established in 1819 this agency was first responsible for any tribes along the Missouri River. In 1836 the agency became responsible for the Sioux, Ponca and Cheyenne people on the upper Missouri. In 1866 the agency was permanently located near Crow Creek on the Missouri in Dakota. Jurisdiction was restricted to the Lower Yanktonai and Sicangu living close by and the name was changed to Crow Creek Agency in 1874.