Fairmount Water Works tour guide Sandy Sorlien leads a walk interpreting remnants of the 108-mile Schuylkill Navigation system along the Roxborough and Manayunk stretches of the river. We’ll meet at the old Shawmont Train Station on Shawmont Avenue, then walk downriver to Flat Rock Dam and the ruins of Lock 68, then along the Manayunk Canal to Lock 69/70 at Venice Island, the only canal “reach” of the 108-mile Schuylkill Navigation with intact lock walls remaining at both ends. A shuttle returns us to Shawmont. This walk is a complement to Sandy’s lecture at the University of Nature, but either event stands alone. Free; registration required.