Project overview
During summer 2023, our contractor crews replaced the damaged girder on the 24th Avenue South bridge over SR 518 near the Sea-Tac International Airport. Crews also made bridge drain and drainpipe improvements in the area.
What to expect
The 24th Avenue South bridge reopened to traffic on Wednesday, Nov. 1, and major construction for this project is complete.
A girder on the 24th Avenue South bridge over State Route 518 in SeaTac was replaced after it was struck by an over-height vehicle.
In 2020, the 24th Street bridge over State Route 518 (milepost 1.44 to 1.46) was struck by an over-height vehicle, causing severe damage to one of the girders over the eastbound lanes. The girder was moved more than a half inch to the east and suffered a crack.
The girder had to be replaced, which required the closure of SR 518 to demolish the old girder and place a new one.
The bridge serves as an artery to and from Sea-Tac International Airport for airport-related businesses located north of SR 518 and for a large Port of Seattle employee parking lot.
