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St. Clair Tunnel
Society: ASCEMain Category: CivilSub Category: TunnelsEra: 1890-1899DateCreated: 1891Beneath the St. Clair RiverSarniaState: ONZip: N7T 8G8Country: CanadaWebsite: http://www.asce.org/Project/St--Clair-Tunnel/Creator: Hobson, Joseph , Beach, Alfred

A Day's Pay According to tunnel records, the following pay rates were established for the 600-700 laborers required for this project: 

YearAdded:
1991
Image Credit: Public DomainImage Caption: Postcard of the west end St. Clair River Tunnel in Port Huron, Michigan, United States.Era_date_from: 1891
Society: ASMEMain Category: MechanicalSub Category: Environmental ControlEra: 1920-1929DateCreated: 1920Hudson River Greenway; ManhattanNew YorkState: NYCountry: USAWebsite: http://www.asme.org/about-asme/history/landmarks/topics-a-l/environmental-control/-93-holland-tunnel-ventilation-system-%281920%29Creator: Freeman, Milton
The first long underwater tunnel in the world designed for motor vehicle use was built from 1920 to 1927. The 29.5-foot-diameter, 8,500-foot-long twin tubes of this tunnel were shield-driven by the pneumatic method through extremely difficult river-bottom conditions that were overcome by the ingenuity and determination of its engineers, Clifford M. Holland, Milton H. Freeman, and Ole Singstad. They were the largest in the United States when built.
YearAdded:
1984
Image Credit: Courtesy Flickr/Bill Benzon (CC BY-SA 2.0)Image Caption: Holland Tunnel Ventilation SystemEra_date_from: 1920
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