Tetra Tech INCA provided plans, specifications, and estimates for construction of a bridge to replace the existing culvert. The design resolved several issues and included a pedestrian trail to connect parks, fish passage to the upper reaches of the creek, increased hydraulic capacity, and a utility corridor for the Midway Sewer District’s proposed 48-inch diameter sewer outfall. The project incorporated a concrete bridge, retaining walls, pedestrian trail, stream relocation, landscaping, storm drainage, paving, curbs and gutters, and other improvements. The street drainage design included modifications to the existing drainage system in the immediate vicinity of the bridge improvement.

INCA’s structural engineers recommended a drilled shaft technique instead of a conventional tie back soldier pile wall for the bridge design, resulting in a 40% cost savings to the City of Des Moines. This unique top-down construction technique minimized traffic disruptions and impacts to existing utilities.

 Marine View Drive Bridge (111.81 kB)
 

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