State transportation officials are avoiding weeks or even months of wait time in inspecting underwater bridge components by using the latest in sonar imaging technology. The method’s potential will become the focus of a federal study next year. Photo: Randalls Photography Advanced technology helped inspectors get images of underwater bridge piers and footings when diving was too dangerous. This spring’s record floods posed high risks for the 80-year-old Sorlie Bridge, which connects Grand Forks, N.D., and East Grand Forks, Minn. Flowing 30 ft higher than normal, the fast-moving Red River of the North engulfed the 605-ft-long, two-span truss structure’s timber
The market is generally healthy and steadily growing, and margins are up for large specialty contractors. Further, advances in design tools and owner demand for collaboration are giving subcontractors a seat at the table early on in projects.