Crews will close the SR 520 floating bridge and highway, plus all ramps between Montlake Boulevard and I-405 this weekend.
The closure will run from 11 p.m. Friday, Oct. 19 to noon Sunday, Oct. 21.
When crews close the highway, SR 520 will remain open between Montlake Boulevard and I-5. In Seattle, the Montlake Boulevard ramps from eastbound SR 520 and to westbound SR 520 will remain open.
All ramps and the mainline are required to reopen by 5 a.m. Monday following weekend closures.