Steel (or iron) truss bridge across the the Douro River near a hydroelectric dam with locks for ships

Steel (or iron) truss bridge across Portugal's Douro River near a hydroelectric dam with locks for ships. Compare the use of this truss for a bridge with two stone piers and one joining stone arches.

Photograph and text by George P. Landow. [You may use this image for any noncommercial purpose as long as you credit the photographer and this URL].


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