Undercrossing opens to link north and south Issaquah

December 16, 2010

By Warren Kagarise

NEW — 3 p.m. Dec. 16, 2010

The link between north and south Issaquah opened to traffic Thursday, after years of planning and months of construction.

Interstate 90 Undercrossing

The long-planned Interstate 90 Undercrossing — or Fourth Avenue Northwest — runs from a traffic signal at the post office along Northwest Gilman Boulevard, connects into the rail corridor behind Gilman Station, forms a T-shaped intersection at Southeast 62nd Street, continues along 221st Place Southeast and then terminates at Southeast 56th Street.

The link supplements traffic-clogged Front Street North and state Route 900, the other connectors between north and south Issaquah.

Both of older crossings also provide access to the interstate, but the combination of local traffic and vehicles from the on- and off-ramps added to the gridlock.

Because part of the undercrossing is located within the King County East Lake Sammamish Trail Corridor, the link also serves as a multimodal facility.

Pickering Trail also crosses Fourth Avenue Northwest at a signalized crossing, and then connects to the East Lake Sammamish Trail.

City Council members approved a $2.4 million budget for the project; more than $1.8 million has been spent so far.

The council picked Kirkland-based MidMountain Contractors to build most of the road link from the post office traffic signal along Northwest Gilman Boulevard to Southeast 56th Street. Issaquah-based Seacon agreed to construct another piece of the undercrossing in order to build the Issaquah Medical Building on the former Zetec site.

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