The preserve contains the 'Yellow Spring,' a mineral-rich iron deposit spring that gave the nearby village its name.
The limestone gorge was carved primarily by glacial meltwater during the last ice age.
The property protects a rare remnant of old-growth forest, with some trees dating back to before European settlement.
The preserve is a designated National Natural Landmark.
It features 'The Inman Trail,' which highlights the unique geological transition between the gorge and the surrounding upland forest.
The site hosts a raptor center that rehabilitates injured birds of prey found in the region.
Glen Helen Nature Preserve is a 1,000-acre private non-profit reserve featuring the Clifton Gorge and the Little Miami River. The landscape is characterized by limestone cliffs, dolomite rock formations, and dense hardwood forests containing trees several centuries old. It includes over 15 miles of trails that lead to natural landmarks such as the Cascades waterfall and the Yellow Spring. The preserve serves as a teaching laboratory for students at neighboring Antioch College. It was donated to the college in 1929 by Hugh Taylor Birch in memory of his daughter, Helen. The area is geologically significant for its exposed Silurian-age bedrock and extensive karst topography. It functions as a protected ecological corridor for diverse Midwestern flora and fauna. The preserve is maintained through membership and private contributions, operating independently from the state park system.
The wooden bridge overlooking the Cascades waterfall.
Wear sturdy, waterproof hiking boots as trails frequently cross mud and shallow creek beds.
Carry a physical map or download trail layouts beforehand, as cellular service is inconsistent within the deep gorge.
Stay on marked trails to protect sensitive erosion-prone cliff edges and fragile vegetation.
Do not attempt to traverse the gorge during or immediately after heavy rainfall due to flash flood risks.
Open daily from dawn to dusk; some trails may close seasonally for maintenance or due to severe weather conditions.
Leash your pets at all times; stay on marked trails; do not collect rocks, fossils, or plants.
