Essentially the Only One

A swing railway bridge at Sabula, Iowa. Taken at the beginning of this month's vacation.

I dithered a while hoping it would open, but there was little river traffic, so I left it. The holiday came and went, but on the final day of our journey, just outside of Louisiana, Missouri, I came across this opened bridge of the same design. Not the best view, but there was a satisfying symmetry nonetheless.