Steel (or iron) truss bridge across the Douro River, Portugal

Steel (or iron) truss bridge across the the Douro River. Portugal. This, the longest bridge along the river, leads to the largest town along the Douro between Porto and the Spanish border. 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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