Snohomish Ped Bridge
Glen Bragaw Interchange
Bridge Abutment from below
Bear Valley Railroad Bridge, OPEN CELL Bridge Abutment Replacement
Sag. River Bridge
Bridge Model
Resurrection River Pedestrian Bridge

Bridge Engineering

Bridge design is a core competency at PND, with a number of award-winning structures designed by our staff, including awards from the American Institute of Steel Construction and the Steel Bridge Alliance among others. PND has produced nearly 300 bridge designs of many sizes and types, including cable-stayed, arch, plate girder, box girder, orthotropic, pre-stressed and post-tension concrete, trusses, and specialty bridges. PND has designed highway, pedestrian, and railroad bridges using a variety of materials, including timber, concrete, steel, fiber-reinforced plastic, and steel strand, all used in combination or individually as dictated by the best design practices for each site.

PND’s bridge expertise encompasses site and type selection, hydrology and hydraulics, geotechnical, seismic, structural design, cost estimation, construction inspection, and existing bridge evaluations. PND's experience includes soils investigations for foundation designs and the design of piles for bridge foundations and piers.

PND follows standard design practices on the majority of designs; however, innovation leading to improved function, safety, and cost reduction often requires a judicious application of fundamental engineering to assure the best solution is obtained.
  • Highway bridges
  • Bridge widening
  • Pedestrian bridges
  • Recreational bridges
  • Railroad bridges
  • Steel girder bridges
  • Timber glulam bridges
  • Timber truss bridges
  • Covered timber bridges
  • Floating bridges
  • Pre-stressed concrete bridges
  • Concrete slab bridges
  • Steel truss bridges
  • Steel box girder bridges