Plan for closures of the 520 floating bridge and I-5 in Federal Way over the coming weekend.

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The Highway 520 floating bridge will close this weekend, and in Federal Way segments of Interstate 5 will close late Friday and Saturday nights — so crews at both sites can install girders for new overpasses.

The full shutdown of Highway 520 will last from 11 p.m. Friday until 5 a.m. Monday, between Montlake Boulevard and I-405. Forty girders and 288 concrete deck panels will be installed at Eastside interchanges. Bus routes 255, 271, 280 and 545 will switch to I-90 during the closure.

In Federal Way, all southbound lanes of I-5 will close at the Highway 18 junction from 11 p.m. Friday to 7 a.m. Saturday, and two northbound lanes will close from 9 p.m. to 7 a.m.

Then on Saturday, all northbound lanes of I-5 will close from 11 p.m. Saturday to 7 a.m. Sunday. Traffic will be detoured.

Some lanes of I-5 will start to close a couple of hours before the overnight construction work.