Boulder to Minneapolis to Chicago 1993 - All Rights Reserved
On the Sparta Elroy bike trail.  This is the entrance to tunnel No. 3, coming from the north, from Sparta.  The sign says BIKES MUST BE WALKED THROUGH TUNNEL KEEP RIGHT SINGLE FILE.  You need a flashlight.  It's pitch black in there.  You can see the light of someone about to exit from the other end.

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