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April 8, 2015
King County's new $162 million South Park Bridge was named a project of the year by the Washington Chapter of the American Public Works Association.
The award was given earlier this month at APWA's spring conference in Tacoma. It recognizes successful management and administration of large-scale transportation projects.
The new bascule bridge over the Duwamish River opened last summer, four years after the original 1931 bridge was closed due to steel corrosion, crumbling concrete piers and outdated electrical controls. The old bridge was demolished.
Kiewit-Massman built the new bridge under a $96 million contract that included riverbank restoration, natural water treatment systems and realignment of the intersection of 14th Avenue South and Dallas Avenue South/South Sullivan Street.
Bridge engineer HNTB had four innovations in its design: sunken caisson foundations; an isolated trunnion frame; a collapsible center joint on the lift spans for seismic performance; and trussed-plate girders that sped fabrication and erection while reducing future maintenance.
HNTB and King County in January received a Structural Systems Gold Award for the bridge from the American Council of Engineering Companies Washington Chapter. The project will also receive recognition at ACEC's national award ceremony later this month in Washington, D.C.