page_title: St. Clair Tunnel
hierarchical_section_title: St. Clair Tunnel
caption_attribution_description: English: Postcard of the west end St. Clair River Tunnel in Port Huron, Michigan, United States. The east end is in Sarnia, Ontario, Canada. The tunnel was designated a Civil Engineering Landmark by both the Canadian and the American Societies of Civil Engineers (CSCE and ASCE) in 1991. The tunnel is a designated US National Historic Landmark, and is listed on the US National Register of Historic Places (NRHP). NRHP reference number 70000684
context_page_description: The St. Clair Tunnel is the name for two separate rail tunnels which were built under the St. Clair River between Sarnia, Ontario and Port Huron, Michigan. The original, opened in 1891 and used until it was replaced by a new larger tunnel in 1995, was the first full-size subaqueous tunnel built in North America. It is a National Historic Landmark of the United States, and has been designated a civil engineering landmark by both US and Canadian engineering bodies.
context_section_description: The St. Clair Tunnel is the name for two separate rail tunnels which were built under the St. Clair River between Sarnia, Ontario and Port Huron, Michigan. The original, opened in 1891 and used until it was replaced by a new larger tunnel in 1995, was the first full-size subaqueous tunnel built in North America.  (By full-size it is meant that it allowed a railroad to run through it.)  It is a National Historic Landmark of the United States, and has been designated a civil engineering landmark by both US and Canadian engineering bodies.
caption: View of the original tunnel (closed in 1994) from a 1907 postcard
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