Weekend closures, lane restrictions impact SR 99, I-5 and I-90

Public can explore new SR 520 bridge this weekend before it opens to traffic

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SEATTLE -- Cyclists and pedestrians will have a chance to explore the new State Route 520 floating bridge this weekend before the structure opens to vehicle traffic.

The new six-lane bridge, the longest floating bridge in the world, over Lake Washington replaces the four-lane version built in 1963. It's designed to be stronger and safer.

A grand opening celebration starts Saturday with a 10K run. Both the old and new 520 bridge will be closed over the weekend for events.

Transportation spokesman Steve Peer says the new bridge will open to westbound vehicle traffic on April 11. Eastbound lanes on the new bridge will open April 25, when the state plans to permanently close the old bridge.

The new bridge includes a 14-foot wide path for bicyclists and pedestrians and a transit/HOV lane in each direction.

Highway closure details from WSDOT:

  • Friday, April 1, to Sunday, April 3: SR 520 will be closed between Montlake Boulevard and 92nd Avenue Northeast from 11 p.m. Friday to 2 p.m. Sunday.
  • Friday, April 8, to Monday, April 11: SR 520 will be fully closed between Montlake Boulevard and 92nd Avenue Northeast from 11 p.m. Friday to 5 a.m. Monday.
  • Friday, April 22, to Monday, April 25: SR 520 will be fully closed between Montlake Boulevard and 92nd Avenue Northeast from 11 p.m. Friday to 5 a.m. Monday.