Fort Astoria was the primary fur trading post of John Jacob Astor's Pacific Fur Company. A maritime contingent of PFC staff was sent on board the Tonquin, while another party traveled overland from St. Louis. This land based group later became known as the Astor Expedition. Built at the entrance of the Columbia River in 1811, Fort Astoria was the first Am…Fort Astoria was the primary fur trading post of John Jacob Astor's Pacific Fur Company. A maritime contingent of PFC staff was sent on board the Tonquin, while another party traveled overland from St. Louis. This land based group later became known as the Astor Expedition. Built at the entrance of the Columbia River in 1811, Fort Astoria was the first American-owned settlement on the Pacific coast of North America.