We are examining solutions to reduce congestion at the I-405/SR 520 interchange. Currently, over half the trips from westbound SR 520 are traveling to the Bellevue vicinity. A new project will allow westbound drivers the option to access the downtown Bellevue vicinity by exiting SR 520 onto 124th Avenue Northeast before reaching the heavily congested I-405/SR 520 interchange. We are partnering with the City of Bellevue to examine cost-effective design solutions.
What to expect
Currently, the I-405/SR 520 interchange is significantly congested. This project will build a new on-ramp to eastbound SR 520 and a new off-ramp from westbound SR 520 at 124th Avenue Northeast, improving access to the Spring District and the medical district as well as downtown Bellevue and future East Link light rail. The project also includes a new eastbound auxiliary lane to NE 148th Street and will realign the existing bike path along westbound SR 520. It will correct fish passage and improve water quality.