In this episode Friends of the Chicago River's Executive Director Margaret Frisbie explores the history and natural history of the Chicago Portage National Historic Site which was a critical transit point between the Mississippi and the Great Lakes. Joining Frisbie are Gary Mechanic, founder of Friends of the Chicago Portage; Ben Goldfarb, author of Eager: The Surprising, Secret Life of Beavers and Why They Matter; and Mayor Sergio Rodriguez of Summit, Ill.
