St. Clair Tunnel, Under St. Clair River between Port Huron, MI, & Sa, Port Huron, St. Clair County, MI
Photo Caption Pages
& Sa, Port Huron, MI
Find maps of Port Huron, MI
Documentation compiled after 1968.
Survey number HAER MI-67
National Register Number: 70000684
Significance: The St. Clair Tunnel was the first full-sized subaqueous tunnel built in North America. Joseph Hobson, the Chief Engineer, successfully combined three significant new technologies -- a tunnel shield driven by hydraulic rams; a cast iron tunnel lining; and the use of a compressed air environment. This tunnel eliminated a major bottleneck in the rail transportation system linking the American midwest with its eastern markets.
Historic American Engineering Record (Library of Congress)
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