The Thorold Tunnel carries Highway 58 underneath the Welland Canal. The canal goes from Lake Erie to Lake Ontario as a bypass for the Niagara River which is not navigable thanks to the Niagara Falls.
The tunnel was built between 1965 and 1967 and is two separate tubes of traffic. Interestingly, it is the only tunnel constructed after the waterway opened. Two lanes with 15 foot clearance so I had no trouble with my Sprinter van and standard semi tractor-trailers would also be okay.
There is no toll for the tunnel.
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