Encyclopedia Dubuque
"Encyclopedia Dubuque is the online authority for all things Dubuque, written by the people who know the city best.”
Marshall Cohen—researcher and producer, CNN
Affiliated with the Local History Network of the State Historical Society of Iowa, and the Iowa Museum Association.
EAST DUBUQUE RAIL TUNNEL
EAST DUBUQUE RAIL TUNNEL. Certainly an engineering feat of its day, the East Dubuque River Tunnel was constructed in 1867 by the ILLINOIS CENTRAL RAILROAD through the river bluffs in Illinois. Built at an estimated depth of 65 feet, the single-track tunnel was bored through the rock for a length of 851 feet. Despite its challenging 90 degree turn, the tunnel is used an estimated seven times daily.
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Source:
John Marvig Railroad Bridge Photography. Online http://www.johnmarvigbridges.org/East%20Dubuque%20Rail%20Tunnel.html