North Dakota: Fort Union Trading Post National Historic Site

Teepees camped outside of the Fort Union Trading  Port for the annual Rendezvous.
Teepees camped outside of the Fort Union Trading Port for the annual Rendezvous.

Courtesy of National Park Service

In 1828 the Assiniboin Indians requested that John Jacob Astor’s American Fur Company establish a trading post in their homeland to protect them from hostile tribes. Kenneth McKenzie thus founded Fort Union in what is now North Dakota. Strategically located near the homelands of 10 Northern Plains tribes, Fort Union was the most important trading post of the Upper Missouri fur trade until smallpox decimated the population of numerous Plains tribes. After resentment toward the white encroachment into Indian Territory led to Sioux hostilities, the need for trading posts declined as the call for military posts increased. The Army dismantled the post in 1867 to build Fort Buford, but historic accounts provide information about the Upper Missouri fur trade and the American Indians who exchanged goods at the Fort Union Trading Post, which is now Fort Union Trading Post National Historic Site.


Established near the junction of the Missouri and Yellowstone rivers, Fort Union Trading Post was a 220 by 240 foot quadrangle enclosed by vertical logs with bastions at the northeast and southwest corners. Fort Union had two points of entry, but the gate on the south side facing the river was the main entrance for the trading public and wagons. Once inside the complex, traders and notable visitors found several prominent buildings surrounding a central courtyard where the flagstaff stood. On the west side of the gate, a long building served as the staff sleeping quarters, and on the east, a similar building housed the retail store and stockroom. 
Across from the main gate stood the striking bourgeois house, where McKenzie and his successors lived. The largest of the Fort Union buildings, this two-story structure had glass windows, a fireplace, and other modern conveniences. Behind the bourgeois house was the Fort Union kitchen, which was also near the trading post’s bell tower. The fort also had an icehouse, a stable, a cut stone powder magazine, and blacksmith shops.  White leather tents or tipis surrounded the flagstaff, and a reception room by the main gate was where the Indians traded their goods.

Although the American Fur Company built Fort Union at the request of the Assiniboin Indians, the company also welcomed many of the other Upper Missouri tribes into the post’s reception room. Other than the Assiniboin, the most common Northern Plains tribes trading at Fort Union were the Crow Indians who lived on the upper Yellowstone River, and the Blackfeet who claimed lands on both sides of the border between the United States and Canada. Also welcomed at Fort Union were the Mandan, Hidatsa, and Arikara who lived along the Missouri River; the Dakota Sioux; the Plains Cree from eastern Canada; and their allies, the Ojibwa, from the Great Lakes region.  

The peaceful Northern Plains tribes traded their renowned buffalo robes, which were becoming a highly sought after commodity at the time of Fort Union’s establishment. By the 1830s, the demand for beaver pelts began to decline, as silk hats were preferred over beaver hats, and the demand for tanned buffalo robes increased.  Fort Union thrived because of the post’s proximity to the Plains Indians. In exchange for the Plains tribes’ buffalo robes, the Americans traded axes, firearms, and other technological goods. Fort Union also installed a distillery in 1832 to produce corn whiskey to offer the Indians in exchange for their buffalo robes.

Although trading liquor proved successful, the establishment of the distillery nearly resulted in the loss of the American Fur Company’s license. It was unlawful to bring liquor into Indian Territory because it gave Fort Union a competitive advantage over other fur companies, and in 1833 the government ordered the American Fur Company to destroy the distillery. Eventually, given their tarnished reputation, the incident forced John Jacob Astor and Kenneth McKenzie into early retirement, and by 1834, Fort Union was under new management.

Following McKenzie’s departure, Fort Union welcomed several outstanding managers (called "bourgeois"), including Alexander Culbertson, Edward Denig, James Kipp, and Charles Larpenteur. As the bourgeois, these men managed the post and were responsible for employing workers and establishing successful trading relationships with the tribes. Assisting the bourgeois were the clerks, who helped maintain the fort’s inventory of traded goods and kept track of tools, equipment, animals, and food. Other employees at Fort Union worked as interpreters, hunters, herders, traders, blacksmiths, carpenters, and masons. Together, these workers, the bourgeois, and their families made up the 200 residents needed for the successful operation of the trading post.

Although most of the residents at Fort Union were employees of the American Fur Company, the trading post had some notable visitors. Among them were George Catlin, Prince Maximilian of Wied, Father Pierre De Smet, John James Audubon, Karl Bodmer, and Rudolph Frederich Kurz, whose paintings and written accounts of life at the post provided the basis for the National Park Service’s reconstruction of the site.

At Fort Union Trading Post National Historic Site, visitors can explore the reconstructed portions of Fort Union including the walls, stone bastion, Indian trade house, and Bourgeois House. The visitor center and bookstore are at the Bourgeois House. Living history programs are available during the summer at the Trade House. Visitors can also walk the Bodmer Overlook Trail to the location where Karl Bodmer once stood and painted “The Assiniboin at Fort Union” in 1833. Each year the site hosts a living history trade fair, but schedules and dates vary. For more information on the annual Fort Union Rendezvous, visit the Fort Union Trading Post National Historic Site.

Fort Union Trading Post National Historic Site, a unit of the National Park System a National Historic Landmark, is located at 15550 HWY 1804 in Williston, ND. Click here for the National Register of Historic Places file: text and photos. Fort Union Trading Post is open daily from 8:00am to 8:00pm during the summer and from 9:00am to 5:30pm in the winter. The Bourgeois House is open daily from 8:00am to 8:00pm in the summer and 9:00am to 5:30pm during the winter. The Bourgeois House visitor center is closed Thanksgiving, Christmas, and New Year’s Day. The Trade House is open daily from 10:00am to 5:45pm and closed on Thanksgiving, Christmas, and New Year’s Day. There is no admission fee. For more information, visit the National Park Service Fort Union Trading Post National Historic Site website or call 701-572-9083.

Fort Union Trading Post National Historic Site is also featured in the National Park Service’s Lewis and Clark Expedition Travel Itinerary.

Last updated: August 7, 2017