Hartley Fort State Preserve sits on a terrace about 80 feet (24 m) above the Upper Iowa, seven miles (11 km) upstream of the confluence with the Upper Mississippi River.
The site is notable for remains of a fortified Native American effigy mound settlement. The mound builder peoples era ruins seem to be associated with the Woodland period Oneota and Cahokia cultures.
The Iowa Hartley Fort State Preserve land is privately owned, and there is no public access currently.
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