Built in 1902, the railroad bridge over the Cedar River at Nashua is a gem.

It’s surprising to see such a massive, concrete arched bridge–it looks very old-fashioned for the technology of the early Twentieth Century.

The remnants of the second road bridge, below, is seen from the new bridge, which replaced it in 1984.

As is common along the Cedar River, large dams with retractable flood gates control water levels and create recreational lakes.

Just as many of the major civil engineering projects in America, it looks like this was built in the economic boon years after World War II.