Fort Jefferson in Darke County, Ohio — The American Midwest (Great Lakes)

Underground Passage

Photographed by Craig Doda, July 17, 2026

1. Underground Passage Marker

Inscription.
Beneath this spot a wooden treated stairway was discovered leading into a passageway to a well, or magazine pit 80 feet to the southwest. The passageway was six feet wide, three feet deep and lined with posts and puncheons.

Erected by Ohio History Connection.

Topics. This historical marker is listed in these topic lists: Architecture • Forts and Castles. A significant historical year for this entry is 1930.

Location. 40° 1.557′ N, 84° 39.375′ W. Marker is in Fort Jefferson, Ohio, in Darke County. It is at the intersection of Weavers-Fort Jefferson Road and Church Street, on the right when traveling east on Weavers-Fort Jefferson Road. Touch for map. Marker is at or near this postal address: 3981 Weavers-Fort Jefferson Rd, Greenville OH 45331, United States of America. Touch for directions.

Regionally, this marker is in Ohio’s Till Plains.

It is also in the American Midwest

and in the Corn Belt.

Globally, it is in North America,

the Western Hemisphere,

the Western World,

and the Anglosphere.

Historically, it finds itself in what was once the Haudenosaunee (Iroquois) Confederacy,

the territory

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of the Mississippian Culture,

and the Northwest Territory.

Other nearby markers. At least 8 other markers are within 4 miles of this marker, measured as the crow flies: Fort Jefferson / St. Clair’s Defeat (a few steps from this marker); Excavation (within shouting distance of this marker); Fort Jefferson (within shouting distance of this marker); William Noble (about 500 feet away); a different marker also named Fort Jefferson (about 700 feet away); a different marker also named Fort Jefferson (approx. 0.2 miles away); Fort Jefferson Veterans Memorial (approx. ¼ mile away); Studabaker School (approx. 3.4 miles away). Touch for a list and map of all markers in Fort Jefferson.

Other markers no longer nearby. Fort Jefferson: A Link in a Chain (was a few steps from this marker but has been permanently removed); a different marker also named Underground Passage (was a few steps from this marker but has been permanently removed); Trench (was a few steps from this marker but has been permanently removed); Ash Pit (was within shouting distance of this marker but has been permanently removed); a different marker also named Excavation

Photographed by Craig Doda, July 17, 2026

2. Underground Passage Marker

(was within shouting distance of this marker but has been permanently removed); Well or Magazine Pit (was within shouting distance of this marker but has been permanently removed); Firepit (was within shouting distance of this marker but has been permanently removed); a different marker also named Fort Jefferson (was about 300 feet away, measured in a direct line but has been permanently removed).

Photographed by Craig Doda, July 17, 2026

3. Underground Passage Marker

Credits. This page was last revised on July 31, 2026. It was originally submitted on July 27, 2026, by Craig Doda of Napoleon, Ohio. This page has been viewed 5 times since then. Photos: 1, 2, 3. submitted on July 27, 2026, by Craig Doda of Napoleon, Ohio. • Devry Becker Jones was the editor who published this page.