Hamilton County, Ohio Old-Growth Forest, Trails, Flowers, Wildlife This Cincinnati Parks property contains remnants of an old growth forest on a terrace of glacial outwash deposited about 250,000 years ago. The forest overlooks a riparian woodland remnant along the Mill Creek. There are 3½ miles of wooded trails, a system designated as a National Recreation Trail. A level, paved trail makes the woods and a view over a deep ravine accessible to wheelchair users. ![]() Protected by Cincinnati ParksCaldwell Park began in 1915, when J. Nelson Caldwell donated 89 acres to Cincinnati Parks. You can support the City of Cincinnati Parks by volunteering or becoming a Friend of Parks. | How to Find Caldwell Nature PreserveThe preserve is located west of the North Bend Road bridge over Mill Creek. A parking lot is on the north side of the road. For location details, click here. |