Thorold Tunnel

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The Thorold Tunnel is an underwater tunnel in Thorold, Ontario, Canada carrying Highway 58 underneath the Welland Canal. Built between 1965 and 1967, the tunnel is 840 metres in length and consists of two separate tubes each containing two lanes of traffic. The westbound tube has a sidewalk for pedestrians.^[1]

Key Information

Tunnel seen from the east
Overview
Route	Highway 58
Crosses	Welland Canal
Operation
Constructed	1965-67
Opened	1967 (1967)
Operator	Ministry of Transportation
Traffic	Vehicle and pedestrian
Vehicles per day	24,300 (2014)
Technical
Length	840 metres (2,760 ft)
No. of lanes	4
Operating speed	80 kilometres per hour (50 mph)
Tunnel clearance	4.5 metres (15 ft)
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It is one of three tunnels under the Welland Canal (the other two being the Main Street and Townline Tunnels in Welland), and the only tunnel to be constructed after the waterway opened.^[1]

The tunnel has been used as a filming location due to its relatively low traffic levels, including for the television series American Gothic and the movie Highwaymen.^[2]

Due to repair work on the tunnel's ceiling tiles, the Ontario Ministry of Transportation began daily closures of the westbound tube in April 2018 outside of morning rush hour.^[3] The repairs are an interim measure and a tender for full rehabilitation of the tunnel was issued by the Ministry on April 4, 2018.^[4] In April, 2024 construction began on the Thorold Tunnel, resulting in nighttime closures and daytime lane restrictions.^[5]