The East Face
This tunnel is a virtual twin to the arch built over Riverside Street Arch.
Photo taken by J.R. Manning in August 2008
BH Photo #120377
Actually, this is the right bridge, the pin was just in the wrong spot
And Dude, this is the UP's ex-Chicago and Northwestern giant culvert. The Milwaukee Road's bridge over the same street, is behind you, to the west.
This tunnel was built first, then the dirt was piled up to it. On this low section of bottom land (and just north of Downtown Janesville) the railroads built wooden trestles then dumped dirt to fill them in. You can still see evidence of this at the bridge on North Main Street, just off Centerway. Rockport Road was Western Avenue when this early poured concrete monstrosity was built. The CNW took old growth trees, alive when Chief Blackhawk was a papoose, right next to the ROW and turned them into trestlework. This entire line, from Chicago to Baraboo, was originally double tracked and was the faster route to the Twin Cities rather than going through Milwaukee.