Fort Keogh, Military fort complex in Miles City, Montana

Fort Keogh is a former U.S. Army post on the south bank of the Yellowstone River at the mouth of the Tongue River, at the western edge of Miles City, Montana. Its surviving one-story frame building has a steep shingled mansard roof, two brick chimneys, two dark-framed dormer windows and an enclosed front porch of tall screens above a paneled base, with a small gabled side entrance. The grounds are now a USDA livestock and range research station.

Colonel Nelson A. Miles founded the post in August 1876, after the Battle of the Little Bighorn, to stop Cheyenne and Sioux bands from reaching Canada. First called Tongue River Cantonment, it was moved a mile west in 1878 and renamed for Captain Myles Keogh, killed at the battle. In 1877 it became headquarters of the District of the Yellowstone. Since then it has served as a USDA livestock and range research station.

The fort's name honours Captain Myles Keogh, an Irish-born officer of the 7th Cavalry killed at the Little Bighorn in 1876; his horse Comanche was found riderless and nursed back to health. The post's garrison drew traders selling whiskey to soldiers, and that settlement, named for Colonel Miles, grew into Miles City.

The site is accessible by car and offers areas to explore both the historical and modern research facilities. Visitors should wear appropriate clothing for variable weather and be prepared for distances across the grounds.

The fort's name honors Captain Myles Keogh, an Irish-born officer of the 7th Cavalry killed at the Little Bighorn. His horse, Comanche, was found riderless on the battlefield, nursed back to health by soldiers, and became a legend. Keogh's body was found at the center of his fallen company.