Important Information About August 18th-21st I-405 Closure

From 10 p.m. Friday, Aug. 18 until 5 a.m. Monday, Aug. 21, both directions of I-405 will be fully closed between Sunset Boulevard in Renton (Exit 5) and Coal Creek Parkway in Bellevue (Exit 10). This closure is for I-405, Renton to Bellevue Widening and Express Toll Lanes work that includes building a box culvert to replace a fish barrier, making it easier for fish to swim and improve the fish habitat upstream. Signed detours will be in place for this full closure on I-405.

Several ramps will also be closed during this weekend closure:

  • Sunset Boulevard Northeast on-ramp to northbound I-405
  • All ramps at North 30th Street to I-405
  • All ramps at Northeast 44th Street to I-405
  • All ramps at 112th Avenue Southeast/Lake Washington Boulevard Southeast (Exit 9) to I-405
  • Coal Creek Parkway Southeast on-ramp to southbound I-405

Whether driving on northbound or southbound I-405, you will need to take a different route during these full lane and ramp closures.

Northbound drivers will exit at State Route 900/Sunset Boulevard Northeast in Renton and rejoin I-405 at Coal Creek Parkway in Bellevue. Another option is to follow additional detour signs to rejoin northbound I-405 at Southeast Eighth Street near downtown Bellevue.

Southbound drivers will exit at Coal Creek Parkway and get back on I-405 at North Southport Drive in Renton. They can also exit at Southeast Eighth Street or Lake Washington Boulevard Southeast (Exit 9) and follow additional signs to detour to North Southport Drive.