Wall Street Bridge
Cass County, ND and Clay County, MN
As the northern edge of the Fargo, ND, and Moorhead, MN, area evolved from farmland to urban areas, the link provided by the Wall Street Bridge grew increasingly critical—not only to the day-to-day movements of traffic but to the safety of the surrounding community.
Traffic counts had increased significantly and were predicted to continue to grow dramatically. The roadway width was substandard for vehicular traffic volumes nor did it accommodate bicyclists or pedestrians with appropriate crossings. Flood events frequently necessitated closure, cutting off housing areas from public safety services. Finally, movement of the bridge piers was advancing to such a state that the stability of the entire structure was becoming questionable. County and state officials determined the bridge was structurally, hydraulically, and geometrically deficient.
A combined effort between Minnesota’s Clay County and North Dakota’s Cass County, WSN’s engineers designed the new Wall Street Bridge to withstand record-setting floods like the one in 1997. Accommodating four lanes of vehicular traffic plus a bike path, the design incorporated a twelve-span composite steel beam bridge to allow for soil movement, an issue unique to the Red River Valley’s clay-rich soil. Aesthetically, the structure’s cut-stone appearance is reminiscent of early railroad bridges found throughout the region.