I-405 will have nightly closures from 9 p.m. to 5 a.m. starting Monday, Aug. 24, through Wednesday, Aug. 26, for northbound work between I-5 and milepost 1.5. A second closure for northbound I-405 from Northeast 85th Street to Northeast 100th Street will run from 11 p.m. Friday, Aug. 28, to 4 a.m. Monday, Aug. 31.
SR 20 near Loup Loup Pass will have alternating, one-lane, two-way traffic Mondays through Thursdays from 6 a.m. to 8 p.m. until Aug. 27. SR 9 will have alternating traffic through a bypass road at Kalloch Road (MP 59) until Sept. 14 for fish passage construction, with daily alternating traffic south of Mount Vernon Big Lake Road (MP 49) until Sept. 3.