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Aerial Lift Bridge: Aerial Lift Bridge and Ship Canal, Entrance to Duluth-Superior Harbor, Duluth, Minnesota

Aerial Lift Bridge: Aerial Lift Bridge and Ship Canal, Entrance to Duluth-Superior Harbor, Duluth, Minnesota
139-D The caption of this post card says The unique Aerial Lift Bridge and Ship Canal Entrance to Duluth-Superior Harbor is an outstanding attraction of this popular summer vacation city. Total bridge load lifted is 900 tons. Only 55 seconds are required to lift the span 135 feet. The Harbor is second only to that of New York City in shipping tonnage and through it passes about 60 per cent of America's iron ore production, from the great iron ore ranges just north of Duluth. Another fact, not included in the caption is that John H. Darling (1847-1942), U.S. Engineer for Duluth-Superior Harbor, oversaw replacement of the original wooden canal piers with concrete piers in 1897. The piers have been maintained and repaired with a major remodeling/rehabilitation in 1985-1986.
1950?
English
2092.6 S2282 B1
umn83923c
Grant provided to the Minnesota Digital Library Coalition through the Library Services and Technology Act (LSTA) and the State Library Services and School Technology unit of the Minnesota Department of Education
In Copyright
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