This edition of Under Rocks revisits a remarkable radio series that predates the podcast, highlighting the creative legacy of their late colleague Carl Nelson. The focus is on the Rock River Trail, a nationally recognized route tracing the Rock River from Fond du Lac, Wisconsin, to its confluence with the Mississippi River. The trail honors the river’s history and future, a vision realized by Frank Schier and Greg Farnham. Notably, Carl and Dan were the first to complete the entire trail by bicycle, and the hosts share original dispatches from their journey.

Listeners are encouraged to explore the Rock River Trail through various activities like biking, canoeing, or horseback riding, with resources available on the official website for maps, tips, and history. The episode also features an interview with Greg Farnham, the trail initiative coordinator, providing deeper insight into the project. The hosts invite audience engagement for future adventures and express fond remembrance of Carl Nelson.