The Detroit Windsor Tunnel

The Detroit--Windsor Tunnel is the only sub aqueous international border crossing in North America connecting Detroit, Michigan in the United States, with Windsor, Ontario in Canada. It was completed in 1930. It is the second busiest crossing between the United States and Canada after the nearby Ambassador Bridge. About 13,000 vehicles (cars, vans, buses) use the tunnel each day. The structure is jointly owned by the two cities. A 2004 Border Transportation Partnership study showed that 150,000 jobs in the region and $13 billion (U.S.) in annual production depend on the Windsor-Detroit international border crossing. When constructed, it was only the third underwater vehicular tunnel constructed in the United States (after the Holland Tunnel between Jersey City, New Jersey, and downtown Manhattan, New York City, New York and the Posey Tube between Oakland and Alameda, California).