During their first unit in the school’s Discovery Lab, John Lewis Childs School fifth graders are learning about bridges. Working in groups, the students create truss bridges out of connector strips.

Contractor Kraemer North American broke ground in October 2023 on a steel through truss bridge that will cross the Mississippi River. It’s the rare bridge construction project that doesn’t have ...

When the 1,200-foot-long Francis Scott Key Bridge opened in 1977, its enormous steel-truss design was the state of the art for river crossings. But in the decades since, a more modern design that has ...