LaSalle Street Tunnel
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The LaSalle Street Tunnel was Chicago's second tunnel under the Chicago River. It was started November 3, 1869, and completed July 4, 1871. It was designed by William Bryson who was the resident engineer for the Washington Street Tunnel. It was 1,890 feet (576m) long, from Randolf Street north to Hubbard (then Michigan) Street, and cost $566,000.
Originally built for pedestrian and horse-drawn traffic, on March 23, 1888 the North Chicago Street Railroad leased the tunnel, and it was used for cable car service until October 21, 1906.
The reversing of the Chicago River exposed the tunnel in 1900 and a wider, deeper replacement was built in a drydock on Goose Island from steel plate. When the tunnel closed to cable cars in 1906 the replacement was lowered into a trench in the riverbed. It opened to electric streetcar service in July 21, 1912.
The LaSalle Street tunnel was in use until November 27, 1939, when it was closed during the construction of the Milwaukee-Lake-Dearborn-Congress subway, the Lake & LaSalle (now Clark & Lake) station of which intersected the tunnel's south ramp under Lake Street. By 1950 the south approach had been covered, the tunnel and the north approach were filled and covered by 1953. 
- Borzo, Greg (2012). Chicago Cable Cars. The History Press. pp. 123–128, 183. ISBN 978-1-60949-327-1.
- Genzen, Jonathan (2007). The Chicago River: A History in Photographs. Westcliffe Publishers. pp. 46–47. ISBN 978-1-56579-553-2. LCCN 2006022119.
- Lind, Alan R. (1979). Chicago Surface Lines: An Illustrated History(3rd ed.). Transit History Press. pp. 210–215. ISBN 978-0-934732-00-0. LCCN 74075870.
- "Tunnels". Encyclopedia of Chicago. Chicago Historical Society and The Newberry Library. 2005. Retrieved 17 March 2013.
- Chicago Fire Insurance Maps Volume 1. Sanborn Map. 1906. pp. 14s, 34n.
- Chicago Fire Insurance Maps Volume 1. Sanborn Map. 1950. pp. 14s, 34n.
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