Towosahgy State Historic Site (23MI2), also known as Beckwith's Fort Archeological Site, is a large Mississippian archaeological site with a Woodland period Baytown culture component located in Mississippi County, Missouri. It is believed to have been inhabited from c. 400-1350. The site is maintained by the Missouri Department of Natural Resources as a state historic site. The name Towosahgy is an Osage word which means "old town." It is not known if members of the historic Osage, who dominated a large area of present-day Missouri at the beginning of encounter with European colonizers, occupied the site. The site was acquired by the Missouri state park system in 1967 and added to the National Register of Historic Places in 1969 as NRIS number 69000113,