Along the south side of SW Cary Parkway, a pedestrian bridge over a Crabtree Creek tributary connects sidewalk at street level, but on the north side, no bridge exists. The sidewalk descends to send pedestrians under the Parkway to the bridge and sidewalk on that side of the road. The Town of Cary asked Alpha & Omega Group to provide engineering services for a new pedestrian bridge on the north side of SW Cary Parkway, linking sidewalks at street level.

Four alternatives were investigated to meet the design requirements of vertical clearance, bridge clear width and minimize fill for sidewalk construction in accordance with Town of Cary and NC ADA requirements. A&O has been able to design the bridge to completely span the floodplain, eliminating the need for 404/401 permitting and saving the Town of Cary months of review time. The design for the pre-fabricated bridge is based on “no-rise” conditions to show that it will not cause any base flood elevation increases. We designed elements, including abutments, footing, and guardrails, per specifications provided by the bridge manufacturer. A&O reviewed all bridge design elements and shop drawings prepared by the bridge manufacturer and provided recommendations for acceptance by the Town. Careful scheduling of the sequence of surveying, geotechnical, wetland delineation, and other services have kept the project on schedule.