Overnight closures on the approach to and from Seattle-Tacoma International Airport are scheduled for three days beginning Tuesday, April 5th to facilitate the installation of girders on the International Boulevard (State Route 99) bridge over State Route 518. The road improvements will add a new lane to the bridge to facilitate the entrance to the new Rental Car Facility, south of Highway 518, scheduled to open in spring 2012.

The closures are scheduled to occur during the overnight hours between 11 p.m. and 4:30 a.m. to lessen the impact to commuters. Three closures will allow four separate girder sections to be placed on the evenings of Tuesday, Wednesday and Thursday, April 5 - 7.

Vehicles will be detoured during each evening construction period. Detour routes will be marked and motorists are encouraged to use caution while traveling in the area.

For a link to information, go to http://www.portseattle.org/seatac/traveler/roads.shtml

The first closure on Tuesday evening will detour vehicles west to the Des Moines Memorial Drive interchange and routed back along eastbound SR518 to reach the airport and SR-99. The loop ramp to southbound SR-99 will remain closed until later this year. Traffic will access southbound SR-99 off of South 154th Street.

The second night's closure, Wednesday, will close both directions of SR-518. Traffic will be detoured through the airport terminal drives.

Finally, Thursday evening's detours will close the airport exit to eastbound SR-518. Traffic will be detoured to South 170th St. and International Boulevard.