I-405/SR 167 Interchange HOV Direct Connector
Atkinson was recently awarded a $116 million design-build contract for the WSDOT’s I-405/SR 167 Interchange Direct Connector in Renton, WA. Jacobs Engineering is the design engineer.
Atkinson will construct a direct connector flyover bridge to join the northbound and southbound SR 167 high occupancy toll (HOT) lanes with the I-405 high occupancy vehicle (HOV) lanes by reconstructing portions of SR 167 and I-405 to accommodate the new direct connector ramps in the median. The scope of work also includes two new I-405 bridges over SR 515 and installing a fish passable Rolling Hills Creek culvert under SR 167.
Atkinson, and designer Jacobs, optimized the interchange design to reduce the roadway footprint width by 50 feet and subsequently the quantity of excavation from Talbot Hill by 100,000 CY. In combination, our nine approved alternate technical concepts allow us to build the majority of the project offline, away from traffic, reduce impacts to adjacent businesses, residences, and wetlands, and achieve our goal of maintaining current traffic capacity on one of the highest volume interchanges in the state throughout construction.
The project team will move an existing 1,400 linear foot noise wall up the hill to a new location—using 116 of the existing panels. To minimize impacts to the Talbot Hill neighborhood, we committed to complete this work in four months and significantly beat our proposed schedule—completing the noise wall move in just six weeks. In addition, work includes rehabilitating PCCP pavement panels and HMA pavement, retaining walls, stormwater treatment and detention facilities, utilities, signing, pavement markings, illumination, ITS, and Toll Infrastructure components.