Archaeological research at LeBus Circle focused on determining the size of the enclosure, when it was constructed, and its history of use. A geophysical survey revealed the ditch and the surrounding embankment.
An entrance, indicated by a well-defined break in the ditch and embankment, is along the earthwork's eastern boundary. A second possible opening - on the west - is located directly opposite the eastern entrance. This could be another intentional gap in the ditch, but not in the embankment. The embankment is still present and this area is extremely low and likely prone to flooding. Thus, flood waters may have scoured the ditch in this portion of the site.
Based on the results of the geophysical work, investigators determined that the enclosure measured 500 feet in diameter from outer embankment to outer embankment. This makes LeBus Circle one of the largest circular enclosures in central Kentucky.
It appears that Native people built the enclosure during a single event. They removed dirt from a 5-foot-deep ditch and then mounded it outward to form an outer embankment. Radiocarbon dates suggest it was built toward the end of the Early Woodland period. At that time, Native groups would have used it for group-wide rituals.
During its initial period of use, the ditch likely began to partially refill due to erosion. When Native groups no longer used the enclosure for large public gatherings, the ground surface stabilized. Evidence shows that for several hundred years, little soil was deposited in the ditch. Late Woodland and Fort Ancient groups may have continued to periodically maintain the site and revisit it for community-wide rituals, but this use did not leave much of a signature in the archaeological record.
Sometime in the late 1500s, it appears that Fort Ancient peoples began to use the site for extended periods. An increase in the amount of soil and charcoal deposited within the ditch from this time raises the possibility that Fort Ancient people periodically set fire to nearby vegetation to redefine or restore the circle to a suitable condition. It is also possible that these groups intentionally refilled the ditch to remove all visible evidence of it from the landscape.