Bridging the Gaps for Pipes and Pedestrians in Lawton, Oklahoma

A 2-mi-long ductile iron pipe replacement project in Lawton, Oklahoma, required a major stream crossing as a part of the replacement segment. Preliminary design observations were made on the limited pedestrian accessibility to cross the channel while investigating the best method of installation for the waterline crossing. Collaboration with the city and design team led to a feasibility study to select pipe and bridge types that would provide a dual pedestrian crossing and waterline crossing. Ultimately, a pipe/pedestrian bridge design was selected and designed. This paper details the alternatives analysis process and shows the configuration and selection of the bridge type. Details of the creek cross section, environmental considerations, and bridge cross section are included. Selection of the optimal bridge configuration to mesh with the pipe and pedestrian needs are included (e.g., security considerations, air valving, decking, and railings).