First International Tunnel

First International Tunnel is a Michigan historical marker in Port Huron, St. Clair County, dedicated 1962.

St. Clair County · dedicated 1962 · 16th Street, Port Huron

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At this point the Grand Trunk Western Railroad tunnel, linking Port Huron with Canada, passes underneath Gratiot Avenue. This international submarine railway tunnel—first in the world—was opened in 1891. The tunnel’s total length is 11,725 feet, with 2,290 feet underwater. The tunnel operations were electrified in 1908 and completely dieselized in 1958. Tracks were lowered in 1949 to accommodate larger freight cars. During World War I, a plot to blast the tunnel was foiled.

TodayHistorical map

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David Rumsey Map Collection, Stanford Libraries

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under a mile from where William Gabby lived in the 1760s

what this marker records spans 1777 to 1789, overlapping William Gabby's years here

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Marker data: Michigan History Center
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First International Tunnel

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