Hartley Fort State Preserve is a state preserve located on the Upper Iowa River in the Driftless Area, in Allamakee County, Iowa, United States.
Geography Hartley Fort State Preserve sits on a terrace about above the Upper Iowa, upstream of the confluence with the Upper Mississippi River.
Native Americans The site is noted for remains of a fortified Native American effigy mound settlement. The mound builder people's era ruins seem to be associated with the Woodland period Oneota and Cahokia cultures.
Access The Iowa Hartley Fort State Preserve land is privately owned, and there is currently no public access.
See also Earthwork (archaeology)
Sources
Hartley Fort State Preserve - Iowa Department of Natural Resources