This tunnel provides access to parkland that is trapped between the old railroad berm and the river, by tunneling under the berm. There is a loop here that simply sends traffic back under the bridge/tunnel. There is a restaurant and lodge on this side of the tunnel, and a pavilion, but there is no parking here. Just a loop.
According to the Shorewood Historical Society, the tunnel was used by an ice company that harvested ice from the river.
Photo taken by J.R. Manning in July 2007