Field NotesOhio

Great Mound (Butler County)

Madison Township · Butler County · Southwest Ohio

The tallest mound in the county, a natural lookout

National Register of Historic PlacesLargest mound in Butler County

A huge Adena mound on a ridge west of Middletown that may have been a signal tower.

Height: 43 feet as first measured in the 1800s; erosion and digging have lowered it (one account says about 34 feet today)
Circumference: 511 feet at the base
Volume: Nearly 825,000 cubic feet of earth
Setting: On a ridgeline, so the summit has a long view
Disturbed: In 1879 locals removed part of the summit; only about 75 percent is undisturbed
Listed: National Register of Historic Places, 1971

The story

The Great Mound stands on the east side of Wayne-Madison Road in Madison Township, west of Middletown. Built by the Adena, it was measured in the 1800s at 43 feet high and 511 feet around, with nearly 825,000 cubic feet of earth, making it the largest mound in Butler County and one of the largest in southwestern Ohio. Because it stands on a ridgeline, anyone on top can see a long way. (One list gives its height as 88 feet, which conflicts with the other sources, and one account says erosion and farming have lowered it to about 34 feet.)

It has not been left alone. In 1879 locals dug off part of the summit and found bones and the remains of fires, and later digging destroyed more of the top, so only about 75 percent of the mound is undisturbed. Its size is thought to reflect the stability of the culture that built it and the devotion of its members to those buried in it.

Related sites

Visiting information you can trust

Check before driving — this site is seasonal, approximate, privately run, or otherwise uncertain. Confirm hours and access with the official source above.

Content last reviewed: September 2026 — this is when Field Notes Ohio's content was last checked, not a live status.
Location confidence: Verified entrance or visitor center
Published coordinates

Prices, hours, closures, campsite availability and trail conditions shown elsewhere on this page are not live — always confirm with the official source before you go.

The Mound That Talked Across the Valley

In the late nineteenth century, scholars noticed something about the big mounds of southwestern Ohio: they stand on ridges, high enough to see one another. The theory took shape that they were built as observation posts, with fires lit on top to send signals across long distances, a chain of beacons across the valley.

The Great Mound of Butler County was the test case. In 1990, three groups of volunteers put the idea to the test. After climbing the Great Mound, the first group established visual contact with the Hill-Kinder Mound in Franklin.

Behind the legend

The 1990 test showed that the mounds could see one another and that a message could plausibly be carried between them. It did not prove that the Adena did it. Burial and ceremony are still the standard explanation for these mounds, and the signal-tower idea is a theory that has survived because the geometry works.

The mound's own condition is a reminder of how much has been lost: an 1879 dig, later damage, and a height figure that varies from source to source.

If you go

Look at the mound from Wayne-Madison Road and notice how the ground falls away on the ridge. If you are in the area, pair the visit with Miamisburg Mound, about 13 miles east.

Visiting

Status

Roadside landmark

Managed by

Check locally

Hours

On the east side of Wayne-Madison Road west of Middletown; view it from the road and confirm access before you go.

Admission

Free (verify locally)

Please note

Respect private property and stay off the mound.

Parks nearby

Hueston Woods State Park

About 15 miles · A lodge, cabins and lake near Oxford, with a huge old-growth beech-maple forest.

Details last checked 2026-09-22. Confirm hours and prices before you go.

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