I-405, SR 20 closures for construction

Legacy automated check: the original source text was not preserved. These earlier verdicts have not passed the current publication checks and may contain errors. Source: original document ↗

• ⚠
  WSDOT has announced multiple highway closures and lane restrictions effective this week through September for construction projects.No usable supporting receipt — unverified.
• ✓
  Starting Thursday evening, September 3, up to two lanes of southbound I-405 from milepost 12 to Coal Creek Parkway will be closed overnight until Friday morning, September 4.“405: Up to two lanes of southbound I-405 from milepost 12 to Coal Creek Parkway Southeast (milepost 10) will be closed overnight, 9 p.m. Thursday, Sept. 3 – 5 a.m. Friday, Sept. 4.”
• ✓
  On August 28, northbound I-405 will close from the Northeast 85th Street on-ramp to Northeast 100th Street from 11 p.m. to 5 a.m. through August 31.“405: Up to three lanes of northbound I-405 will close from the Northeast 85th Street on-ramp to Northeast 100th Street from 11 p.m. Friday Aug. 28 to 5 a.m. Monday, Aug. 31. A signed detour will be in place.”
• ✓
  State Route 20 will alternate traffic with flaggers daily (except weekends) from Swin Slough Bridge to Laconner Whitney Road for Anacortes utilities work beginning August 21.“020: Daily (except Saturday, Sunday) beginning Aug. 21 until further notice: State Route 20 traffic will alternate with flaggers from the Swin Slough Bridge (milepost 50) to Laconner Whitney Road/Bay View Road (milepost 53) for city Anacortes utilities work.”
• ⚠
  The closures affect daily commutes and travel patterns.No usable supporting receipt — unverified.
• ✓
  Detours and reduced lanes in place for infrastructure projects including fish passage construction near I-5 and utility work on SR 4.“005: The northbound and southbound I-5 will be reduced to a single lane from 8 p.m. to 5 a.m. nightly Monday, Aug. 31, through Friday morning, Sept. 4, near Alger/Lake Samish Road (exit 240) for fish passage construction. 005: The left lane of northbound I-5 will close from 8 p.m. to 5 a.m. nightly Sunday, Aug. 30, through Friday morning, Sept. 4, north of North Lake Samish (exit 246) for fish passage construction. 004: Construction on SR 4 westbound from milepost 57.5 near 42nd Avenue to milepost 57 near 44th Avenue will have the right lane closed for underground utility work, use caution beginning at 7:50 am on August 29, 2026 until further notice.”
• ⚠
  Most closures are scheduled for overnight or weekday work hours to minimize disruption.No usable supporting receipt — unverified.