What's The Story
Conjoined mounds are rare if not unique among Middle Woodland mounds in the Illinois River Valley. These mounds are among more than a dozen burial mounds found in and nearby Havana. To the best of our knowledge, these mounds have not been excavated.
The Twin mounds were a landmark to French voyageurs, mostly French-Canadian boatmen transporting furs by canoe. In 1684, Henri Joutel, one of LaSalle’s associates referred to the mounds as “deux mamelles” or two hills.
The Twin Mounds are owned and protected by the Archaeological Conservancy.