The Diamond R Transportation Company established Fort Carroll and its trading post in 1874 to move freight and passengers from the Missouri River docks to Helena, Montana. The company named the post for Matthew Carroll, one of its founders. The plan was to replace Fort Sheridan (also called Kerchival City Post) and challenge Fort Benton as a transportation and supply center. The steamboat landing was also called Carroll Landing. The 7th U.S. Infantry garrisoned the post in the summers of 1874 and 1875. The town of Carroll, Montana, soon sprang up at the landing. It no longer exists today.
Montana Gold Miner.
Freight destined for the goldfields in Helena left St. Paul, Minnesota, on the newly constructed Northern Pacific Railroad for Bismarck, North Dakota, where the rails ended. It then came by steamboat up the Missouri River to the newly built Fort Carroll and then overland by wagon to Helena. Supplies and materials for Fort Maginnis, Montana, followed the same route in 1880-81, and then overland to Fort Maginnis on the Carroll Trail. At some point, the site was renamed Rocky Point.
The landing sat in a stand of cottonwoods, with banks about a foot above the water. Joseph Kipp ran a trading post here from 1880 to 1882, consisting of a trade store, storehouse, and residence. Both the town and the fort were abandoned in 1882.
It was located about 30 miles above the mouth of the Musselshell River on the Missouri River in present-day Fergus County.
©Kathy Alexander/Legends of America, updated October 2026.
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