A viaduct is a long bridge consisting of a series of short spans supported on piers or towers. In the U.S. viaducts became popular in the era of railroad building to take the rails across wide valleys. Not long ago I had a two-viaduct day in northern Pennsylvania. The best photos are aerial shots with blue sky, fall foliage, and an historic locomotive traversing the span. I didn’t manage that, but viaducts are nonetheless interesting subjects worth capturing.

I found three aspects of viaducts I could treat on a cloudy winter’s day: the panorama of the setting, the craftsmanship of construction, and life under the bridge.

Starrucca Viaduct. Larger version here.