Aecom will be lead designer for Washington State’s $1.375bn project to replace the 1960s-era Portage Bay Bridge in Seattle.
It will work with contractor Skanska, which won the design-build contract in March this year.
As well as replacing the bridge with two, seismically stronger structures, Skanska will build the “Roanoke Lid”, a landscaped cover on a stretch of State Road 520 between Seattle’s Roanoke Park and North Capitol Hill neighbourhoods.
Aecom said the lid would create nearly three acres of open public space between 10th Avenue East and Delmar Drive, reconnecting neighbourhoods that were severed when the road was built.
It will oversee the technical design of two new parallel bridges to replace the old one, one for eastbound traffic and the other for westbound traffic.
Aecom’s global transport chief executive Mark Southwell said the project would relieve one of Washington State’s most congested routes.
Commissioned by the Washington State Department of Transportation, the “SR 520 Portage Bay Bridge and Roanoke Lid Project” aims for completion in 2031.
It will give commuters across Lake Washington and through the SR 520 corridor access to new ramps and better connections to local streets and shared-use trails.
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