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August 9, 2019

Crews ready to remove falsework from I-405 rail bridge in Bellevue

Photo from Sound Transit [enlarge]
The 810-foot-long bridge spans I-405 near downtown Bellevue.

Motorists might want to avoid southbound Interstate 405 in Bellevue this weekend, as crews remove temporary falsework that helped build a light rail bridge over the freeway near the Northeast Sixth Street access ramp.

Sound Transit says southbound freeway ramps will be closed starting at 10 p.m. tonight. Then, the southbound mainline will be closed in the wee hours of Sunday morning, just after midnight. Both will reopen before the Monday morning commute.

A second weekend closure, of the northbound lanes, will be held Aug. 16-19.

It took crews just over a year to finish the 810-foot-long cast-in-place bridge over I-405. The steel falsework columns and beams supported the permanent structure while it was under construction. Crews will use an electric winch to remove and lower the falsework to the surface of the freeway, where it will be disassembled and trucked away.

Sound Transit says the job would have taken more than 20 weeks of weeknight work to finish without the weekend directional closures.

The work is part of the $413.5 million E335 contract, which was awarded to a joint venture of Stacy and Witbeck and Atkinson Construction. E335 includes 1.9 miles of new rail between downtown Bellevue and the Spring District, with track at-grade, elevated and in a tunnel. There also will be four stations: at East Main Street, Northeast Sixth (Bellevue Transit Center), Overlake Hospital and in the Spring District.

E335 is part of the $3.7 billion East Link, which will open in 2023 with 14 miles of track connecting the Eastside to Seattle.

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