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Project details

SR520 Montlake to Lake Washington I/C & Bridge Replacement

Project Description

Eastside Transit and HOV Project – Widening of SR 520 between Evergreen Point Road at the eastern shore of the lake and 108th Avenue Northeast to six lanes, constructing three community-connecting lids and making other corridor-wide improvements to complete a transit/HOV lane in each direction. WSDOT ultimately plans to move SR 520’s outside HOV lanes east of I-405 to the inside to align with the new ones.

SR-520: I-5 to Lake Washington (West Approach Bridge North) – Construction of a permanent, seismically sound west approach bridge structure to connect westbound traffic from the floating bridge to the Montlake Boulevard Interchange near the University of Washington in Seattle, as well as extending SR 520’s new bicycle and pedestrian path from the Eastside to the Montlake neighborhood of Seattle.

SR 520: I-5 to Lake Washington (Rest of the West) – In addition to the West Approach Bridge North, several other project elements will be constructed between the west end of the floating bridge and the SR 520 interchange with I-5.

Montlake Phase – West Approach Bridge South, Montlake lid and interchange with Montlake Boulevard, and land bridge over SR 520 east of the interchange.

Portage Bay Phase – Six-lane Portage Bay Bridge including extension of the bicycle and pedestrian path west of Montlake Boulevard connecting to the interchange with I-5, Roanoke neighborhood lid, and I-5 connections.

Montlake Cut Crossing Phase – Second bascule bridge over the Montlake Cut connecting SR 520 to the University of Washington.




Graham Contracting, American Bridge, Penhall


Seattle, WA