Up to four lanes of southbound I-405 will close overnight from milepost 14.25 to milepost 12.5, from 10 p.m. Friday, Aug. 28 to 8 a.m. Saturday, Aug. 29. This follows a similar northbound I-405 closure from Northeast 85th Street to Northeast 100th Street, running from 11 p.m. Friday to 5 a.m. Monday.
SR 9 will reduce to a single lane near Kalloch Road (MP 59) through Sept. 14 for fish passage construction, with alternating traffic through a bypass. The same project will also require alternating traffic Mondays through Thursdays through Sept. 3, just south of Mount Vernon Big Lake Road (MP 49).
WSDOT encourages drivers to expect delays and use alternate routes during these closures, which are part of ongoing infrastructure improvements.