Project news

• Plan ahead for southbound I-5 mainline and express lanes closures the weekend of June 22-23, as crews replace nine broken and cracked concrete panels. For updated information, check the I-5 construction webpage.
• Throughout the summer, travelers should expect lane and ramp closures beginning as early as 8 p.m. on weeknights and 9 p.m. on weekends. Crews may also close the southbound I-5 mainline at night and shift traffic onto the collector-distributor.
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Overview

The pavement is worn on southbound I-5, as well as on the southbound collector/distributor, which has on- and off-ramps connecting the interstate to downtown Seattle and I-90. Since this section of I-5 opened in the mid-1960s, cracks and ruts have developed in the lanes that now carry about 120,000 vehicles each day.

Between Spring Street in downtown Seattle and South Lucile Street near Boeing Field, contractor crews will repair and replace broken concrete panels, grind the top layer of pavement in all lanes to eliminate ruts, repave several ramps and repair the gate at the south end of the I-5 express lanes.

Needs & benefits

Rehabilitating this section of southbound I-5 and the collector/distributor will extend the useful life of this section of the interstate. It will also create safer and improved driving conditions for the tens of thousands of travelers who use I-5 each day. This project is part of a multi-year effort to preserve I-5 through King County.

• Preservation: Replacing broken concrete panels, grinding to eliminate ruts and repaving ramps improves the driving surface and extends the lifespan of I-5.
• Safety: Eliminating ruts limits the opportunity for water to collect on the roadway, which can reduce traction for drivers.
• Economic: Replacing broken concrete panels, grinding the lanes and repaving ramps preserves the interstate and reduces the need for costly emergency repairs.

Timeline

• May 2018: Project was awarded to MidMountain Contractors.
• Summer 2018: Construction began.
• Fall 2019: Construction is scheduled to be complete.