National Steel Bridge Alliance
A Century of American Steel Bridges
New Interactive Bridge Timeline
Did you know that the word "dinosaur" is younger than the oldest U.S. steel bridge that's still in service? A lot happened between 1838 and 1938--including the construction of more than 25,000 U.S. steel bridges that are still in service. Check out our new interactive timeline featuring a century of steel bridges throughout history!
Featured Prize Bridge Award Winner
Grand Avenue Bridge
The Grand Avenue Bridge in Glenwood Springs, Colo., features an uncoated weathering steel tub girder bridge that has a straight to horizontally curved alignment with variable depth girders to accommodate the long spans over the highway, river, and railroad, and a shallower depth over a pedestrian plaza.
Featured Steel Bridge Project
Lake Bridges Over Kentucky Lake and Lake Barkley
Opened to traffic in 2018, the new U.S. 68/KY 80 Bridges replaced two narrow 20-foot-wide 1930's era truss bridges. The main spans over each of the navigable waterways with substantial barge traffic feature a unique, basket-handled tied arch superstructure with steel plate girder approaches.
Featured Historic Steel Bridge
Homestead Grays Bridge
While downtown Pittsburgh is known for iconic long-span steel bridges, there are several impressive and treasured long-span river crossings outside of the downtown area as well, such as the Homestead Grays Bridge--a high-level steel bridge nearly 100 feet above the Monongahela River.
Steel Span to Weight Curves
Need a quick estimate for steel bridge superstructure weight? Then look no further than the NSBA's "Steel Span To Weight Curves". They are a great way to compare various span arrangements and girder spacings on the back-of-an-envelope.
Steel Bridge Design Workshop
Thanks for making our Virtual Steel Bridge Design Workshop a great success! Video recordings and handouts from each of the sessions are now available.