The St. Clair Tunnel
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Hard Oiler
N 42° 57.461 W 082° 24.614
17T E 384974 N 4757080
Built during 1889-91 by the Grand Trunk Railway to link Sarnia, Ontario with Port Huron, Michigan, the St. Clair Tunnel was the first international submarine railway tunnel in the world
Waymark Code: WM941
Location: Ontario, Canada
Date Posted: 03/17/2006
Views: 34
This plaque marks the completion of the St Clair Tunnel at 11.30pm on August 30th 1890. An engineering feat at the time, two 21 foot shields were used to excavate the 1,836 m (6,025 ft) tunnel. The bore diameter of 19’ 10” could not handle larger freight cars and a new tunnel, 27’ 6” in diameter was opened in 1994. Perhaps not surprisingly the new tunnel took longer to complete than the old tunnel. From the plaque location you can see the portals of both tunnels. The old one is sealed although there has been some discussion about reopening it as a walking trail – probably an unlikely development, particularly since it has been used for various illegal activities. There are two caches close by – including What a Bore! located in the National Historic Civil Engineering Site exhibit recognizing this engineering achievement
Physical location of plaque: City
This 'Plaque' describes: A 'Structure'
Condition of sign: Good Condition
Address or location of plaque: Not listed
"Ontario Plaques" Website for this "Plaque": Not listed
A web-site for more details.: Not listed
Description of any physical remains at site of "Historical Plaque": Not listed
Is this a bilingual sign?: Not listed
What is the second/third language?: Not listed
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