Raynolds Expedition

The Raynolds Expedition was a United States Army exploring and mapping party which left St. Louis, Missouri May 29, 1859 and was intended to map the unexplored territory between Fort Pierre, Dakota Territory and headwaters of the Yellowstone River. Led by experienced explorer and topographical engineer Captain William F. Raynolds, other members included photographer James D. Hutton, geologist and naturalist Ferdinand Vandeveer Hayden. The expedition was guided by legendary mountain man Jim Bridger.