(Stone Arch) across a ditch in Elsah, Jersey County, IL. Lasalle St. N. 1 block from jct with IL100, E. on Mississippi St. 1 block, N. on Mill St. 0.4 miles to the tunnel on the E. side of the road. (N38 57.420 W90 21.528) Photo by Jack & June Schmidt 9-2-09.