I-405 is highly congested at this location. This project will construct one additional northbound lane on I-405 from SR 520 to NE 160th St, and one additional southbound lane from SR 522 to SR 520. This project will replace the NE 160th St to SR 522 weave section with a braided ramp, grade separating the NE 160th St ramp from the off ramp to SR 522. Northbound I-405 will also be widened to add an auxiliary (add/drop) lane between NE 195th St and SR 527 in Bothell. This project will replace mainline structures on I-405 at NE 132nd St. This bundle will reduce congestion and enhance mobility on I-405.
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