Major Interchange Construction Begins Near I-5 in Shoreline
Construction has commenced on a multi-million dollar overhaul of the interchange near Interstate 5 on the North 145th Street corridor in Shoreline. The project is expected to cause significant and prolonged traffic disruptions for commuters in the area. Local authorities are advising drivers to seek alternate routes.
- The core of the project involves replacing the signalized intersections on both sides of the I-5 overpass with multi-lane roundabouts and adding new pedestrian crossings and bike lanes. - This interchange overhaul is part of the larger, multi-phased 145th Street Corridor Project, with an estimated total cost of $69.56 million for all phases. - Construction on the current phase began in April 2024 and is scheduled for completion in the spring of 2026; the contract was awarded to Johansen Construction Company. - A primary driver for the project is to improve multimodal access to the new Sound Transit Shoreline South/148th Light Rail Station, which opened in 2024. - Funding is sourced from a mix of federal, state, and local grants, including a significant $20 million Rebuilding American Infrastructure with Sustainability and Equity (RAISE) grant. - The design was a collaborative effort between the City of Shoreline, WSDOT, Sound Transit, the City of Seattle, and King County Metro. - Future phases of the 145th Street Corridor project are planned to begin construction in 2027, extending road widening and safety improvements west toward Aurora Avenue N. - The first phase of construction required the removal of 317 trees to accommodate the widened roadway and new interchange configuration.
