Fort Osage

Fort Osage is a reconstructed 19th-century U.S. Army trading post on a Missouri River bluff at Sibley, Missouri in eastern Jackson County. William Clark led its construction in September 1808, and the Treaty of Fort Clark (November 1808) established it as a government “factory” trading with the Osage Nation. Formally closed in 1822, the fort was rebuilt from Clark’s original surveys between 1948 and 1961, designated a National Historic Landmark on November 5, 1961, and operates today as a Jackson County museum.¹

Overview

Established	September 1808 — William Clark led construction1
Treaty	Treaty of Fort Clark, November 18081
Purpose	U.S. government trading factory serving the Osage Nation1
First factor	George C. Sibley1
First commander	Captain Eli Clemson (1808–1813)1
Abandoned	June 1813 (War of 1812); reoccupied 18151
Formally closed	18221
Reconstruction	1948–1961, from Clark’s original surveys1
NHL designation	November 5, 19611

History

William Clark led the construction party in September 1808, siting the post on a Missouri River bluff in what is now Sibley, MO. The fort was formally named by Captain Eli Clemson, its first commander (1808–1813).¹

The Treaty of Fort Clark, signed in November 1808, established the fort as a government trading factory to serve the Osage Nation, providing that the United States would “build a fort on the right bank of the Missouri … and do agree to garrison the same … for the protection of all orderly, friendly and well disposed Indians.” George C. Sibley — the town’s namesake — served as the first factor, reporting a prosperous trade with goods sold “at prices less than half what the traders extort from them.”¹

The fort was abandoned in June 1813 during the War of 1812, reoccupied in 1815, and formally closed in 1822. By 1836 it had deteriorated significantly.¹

Reconstruction (1948–1961)

Archaeologists rediscovered the foundations in the 1940s. The fort was reconstructed between 1948 and 1961, following William Clark’s original surveys. It was designated a National Historic Landmark on November 5, 1961, and today operates as a Jackson County Parks museum (typical hours: Tuesday–Sunday, 9 AM – 4:30 PM).¹

Sources

See also

• jackson-county-mo
• missouri-river
• native-american
• Wiki

Footnotes

1. Wikipedia — “Fort Osage.” — asserts: location in Sibley, MO (Jackson County) on Missouri River bluff at stated coordinates; construction led by William Clark September 1808; naming by Captain Eli Clemson (commander 1808–1813); Treaty of Fort Clark (November 1808) quoted text and purpose; George C. Sibley first factor; abandonment June 1813, reoccupation 1815, formal closure 1822; deterioration by 1836; foundation rediscovery in the 1940s; reconstruction 1948–1961 using Clark’s original surveys; National Historic Landmark designation November 5, 1961; current museum operation and typical Tue–Sun hours. ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴