The 5 span, 325'-long steel stringer bridge built in 1943 is composed of one, 3-span continuous span (1 @ 71',85',71') and 2 simply supported spans of 47'-long each. The bridge is supported on concrete abutments and concrete bent piers. It has Moderne-style concrete parapets with horizontal scoring, a concrete deck, and concrete diaphragms. The beams have riveted splice plates. The continuous design was an important improvement in steel stringer bridge design that was first applied in limited numbers by the state highway department in the late 1930s and early 1940s, and was used frequently after World War II. The continuous steel stringer designs achieved economy of material in comparison to simply supported spans of similar length. They proved extremely adaptable to bridge building conditions in Pennsylvania and throughout the nation because of their economy of material, ease of erection, permanence, and deck joint reduction. The SR 291 bridge is noteworthy as a complete and early, prototypical example of the continuous steel stringer bridges designed by the state highway department's bridge unit.