Fort Vasquez Trading Post, constructed in 1835, was the first permanent structure built along the South Platte River.  Louis Vasquez and Andrew Sublette of St. Louis established their adobe outpost on a low plateau near the Trappers’ Trail.  They wanted to be near the Cheyenne and Arapaho Indians, who traded buffalo robes for blankets, beads, kettles, knives, guns, ammunition and other manufactured goods.