Note 136 — {87} CHAPTER V
Reading edition
Fort Osage was surrounded by a tract six miles square. It was the only government trading factory west of the Mississippi. The post was occupied at intervals until 1827, when it was superseded by Fort Leavenworth and permanently abandoned. The site was near that of the present town of Sibley, Jackson County, which was named in honor of George C. Sibley (see volume v of our series, note 36), who was (1818-25) government agent at Fort Osage. The distance above Chariton River, by the government survey of the Missouri, is a hundred and twenty miles. See our volume v, note 31.—Ed.