Bridge design is a core competency at PND, with a number of award-winning structures designed by our staff. PND has designed hundreds of bridges of varied material types and construction methods. PND’s bridge engineering experience ranges from the innovative STRAND BRIDGE™ system for long-span light pedestrian loads to heavy-duty structures on the North Slope. PND has designed highway, pedestrian, and railroad bridges using a variety of materials, including timber, concrete, steel, fiber-reinforced plastic, and steel strand. PND has also provided design for recreational trail systems, including multiuse and non-motorized trails with pedestrian bridges. PND specializes in trail design elements such as trail alignment plans, retaining wall structures, cuts and fills, erosion protection, pedestrian bridge structures, underpasses, overpasses, and Americans with Disabilities Act compliance.