The Thorold Tunnel is an

underwater tunnel An underwater tunnel is a tunnel which is partly or wholly constructed under the sea or a river. They are often used where building a bridge or operating a ferry link is unviable, or to provide competition or relief for existing bridges or ferry l ...

Thorold Thorold is a city in Ontario, Canada, located on the Niagara Escarpment. It is also the seat of the Regional Municipality of Niagara. The Welland Canal passes through the city, featuring lock 7 and the Twin Flight Locks. History The first surv ...

Ontario Ontario is the southernmost Provinces and territories of Canada, province of Canada. Located in Central Canada, Ontario is the Population of Canada by province and territory, country's most populous province. As of the 2021 Canadian census, it ...

, Canada carrying Highway 58 underneath the

Welland Canal The Welland Canal is a ship canal in Ontario, Canada, and part of the St. Lawrence Seaway and Great Lakes Waterway. The canal traverses the Niagara Peninsula between Port Weller, Ontario, Port Weller on Lake Ontario, and Port Colborne on Lak ...

. 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. It is one of three tunnels under the Welland Canal (the other two being the Main Street and

Townline Tunnel The Townline Tunnel is an underwater tunnel in Welland, Ontario, Canada carrying Ontario Highway 58A, Highway 58A as well as the Canadian Pacific Railway under the Welland Canal. The tunnel The Townline Tunnel is a two-cell reinforced concre ...

s in

Welland Welland is a city in the Regional Municipality of Niagara in Southern Ontario, Canada. As of 2021, it had a population of 55,750. The city is in the centre of Niagara and located within a half-hour driving distance to Niagara Falls, Niagara-on ...

), and the only tunnel to be constructed after the waterway opened. The tunnel has been used as a filming location due to its relatively low traffic levels, including for the television series ''

American Gothic ''American Gothic'' is a 1930 oil on beaverwood painting by the American Regionalist artist Grant Wood. Depicting a Midwestern farmer and his wife or daughter standing in front of their Carpenter Gothic style home, ''American Gothic'' is one ...

'' and the movie ''

Highwaymen A highwayman was a robber who stole from travellers. This type of thief usually travelled and robbed by horse as compared to a footpad who travelled and robbed on foot; mounted highwaymen were widely considered to be socially superior to foo ...

''. 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. In April, 2024 construction began on the Thorold Tunnel, resulting in nighttime closures and daytime lane restrictions.

References

{{Coord, 43.11580, N, 79.19409, W, display=title Road tunnels in Ontario Thorold Tunnels completed in 1967 Welland Canal