Tunnel seen from the east
|Operator||Ministry of Transportation|
|Traffic||Vehicle and pedestrian|
|Vehicles per day||24,300 (2014)|
|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)|
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.
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. The repairs are an interim measure and a tender for full rehabilitation of the tunnel was issued by the Ministry on April 4, 2018.
- "The Thorold Tunnel". Traveller's Information. Ministry of Transportation of Ontario. Archived from the original on July 25, 2014. Retrieved August 8, 2016.
- Walter, Karena (March 10, 2016). "Thorold Tunnel captures TV spotlight". St. Catharines Standard. Archived from the original on November 29, 2017. Retrieved August 8, 2016.
- Liddycoat, Bob (April 25, 2018). "Thorold Tunnel To Experience Daily Closures". The Thorold News. Retrieved July 4, 2018.
- "Contract Number 2018-2007". Registry, Appraisal and Qualification System. Ontario Ministry of Transportation. Retrieved July 4, 2018.