Tunnel through Split Rock
Near LaSalle, Illinois
Split Rock got it's name from the time of the building of the Illinois and Michigan Canal. It was a tall limestone, sandstone and dolomite stone obstacle that stood in the way of the canal, so the workers blasted through it - thus the name split rock.
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The Split Rock Tunnel
Original brick lining still in place
As railroads replaced the canal, the Rock Island Railroad cut a tunnel through Split Rock to get their trains through the stone formation. This tunnel remains in Split Rock to this day, but the old tracks and bridge have been removed.
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The 706 delivering a load of sand to LaSalle
One can still access the tunnel, and from the looks of it, not many people do. It's a 2.5 mile walk from Utica along the I and M Canal Towpath, but well worth it.