Drivers on state Route 18 in Federal Way should be prepared for overnight closures this week as crews lift concrete bridge girders into place.
The eastbound lanes near Interstate 5 will shut down from 11 p.m. to 4 a.m. tonight and Tuesday night.
A nine-mile detour will send traffic from southbound Interstate 5 to 54th Avenue East before continuing on to northbound I-5.
Crews will close westbound lanes from 11 p.m. to 4 a.m. Wednesday and Thursday nights while construction on the $112 million project continues.
A four-mile detour will be available from northbound I-5 to South 320th Street before continuing on to southbound I-5.
The work is part of the effort to alleviate congestion at the interchange connecting I-5, Route 18 and state Route 161. Two new flyover ramps are also being built to reduce lane weaving.