The adobe fort quickly became the center of the Bent, St. Vrain Company's expanding trade empire, which included
Fort Saint Vrain to the north and
Fort Adobe to the south, along with company stores in
New Mexico at
Taos and
Santa Fe. The primary trade was with the Southern
Cheyenne and
Arapaho Indians for
buffalo robes. From 1833 to 1849, the fort was a stopping point along the
Santa Fe Trail. From 1833 to 1849, the fort was a key trading hub along the Santa Fe Trail. Although founded by American traders, it was located on Mexican territory and operated under Mexican jurisdiction until 1848. Bent, St. Vrain & Company obtained Mexican trading licenses and paid customs duties on goods moving through the region. The fort maintained close economic and legal ties to Mexican New Mexico, serving as a critical link between U.S. and Mexican trade networks. The U.S. Army,
explorers, and other travelers stopped at the fort to replenish supplies, such as water and food, and perform needed maintenance to their wagons. The American frontiersman
Kit Carson was employed as a hunter by the Bent brothers in 1841, and regularly visited the Fort. Likewise, the explorer
John C. Frémont used the Fort as both a staging area and a replenishment junction, for his expeditions. During the
Mexican–American War in 1846, the fort became a staging area for Colonel
Stephen Watts Kearny's "Army of the West".
Ralph Emerson Twitchell makes the following statement. Bent's Fort is described as having been a structure built of adobe bricks. It was 180 feet long and 135 feet wide. The walls were 15 feet in height and four feet thick and it was the strongest post at that time west of Ft. Leavenworth. The construction of this fort was commenced in 1828 ... at a point on the Arkansas somewhere between the present cities of Pueblo and Canon City, having been disadvantageously located. Four years were required in which to complete the structure. On the northwest and southeast corners were hexagonal bastions, in which were mounted a number of cannon. The walls of the fort served as walls of the rooms, all of which faced inwardly on a court or plaza. The walls were loopholed for musketry, and the entrance was through large wooden gates of very heavy timbers. ==Abandonment==