Excellence in Transportation Award:
Design: Large Project
Winner: East Parkcenter River Crossing
East ParkCenter River Crossing:
The East ParkCenter River Crossing (the Project) administered by Ada County Highway District (ACHD) is an ideal candidate for the Excellence in Transportation Award, Large Design Category. The planning and design development for this long-awaited transportation link provides motorists, riders, bicyclists, and pedestrians enhanced multimodal connectivity in this thriving commercial and residential community.
Traffic congestion and access to the east side of Boise were key drivers for the East ParkCenter River Crossing. This new alternative route crossing the Boise River decreases travel times, improves safety, and significantly reduces current congestion by redirecting heavy commuter traffic away from the historical Warm Springs area. Balancing competing interests is a challenge in any engineering project, particularly a high-profile example like the East ParkCenter River Crossing. A context-sensitive solution design approach equally considered safety, mobility, and the preservation of scenic, aesthetic, historic, environmental, and other community values.
The Project comprises a new urban roadway; five bridge structures; pedestrian
The Team worked with ACHD to design a 420-foot-long, steel girder bridge; a 110-foot precast concrete bridge; and a 36-foot precast arch that supports a four-lane roadway. Two 14-footwide pedestrian tunnels were also designed to provide safe access under the roadway for pedestrians on the popular Boise River Greenbelt. The Project was designed with bicycle and walking paths to connect to existing pathways as well as planned pathways for the future Marianne Williams Park development, which will be located northeast of the project.
Balancing competing interests
Thinking outside the box
For the girder placement on the Boise River structure, the contractor was challenged with finding a way to minimize river impacts; they responded with a different girder placement sequence, using a larger crane to completely avoid use of a crane pad within the riverbed.