I-405, SR 20 closures begin late August

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  I-405 will close southbound lanes from milepost 12 to Coal Creek Parkway Southeast“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.”
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  The closure of I-405 southbound lanes will occur overnight Thursday, Sept. 3 to Friday, Sept. 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.”
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  SR 20 will alternate traffic daily except weekends from Swin Slough Bridge to Laconner Whitney Road“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.”
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  The utilities work on SR 20 will begin Aug. 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.”
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  SR 116 remains closed through October for a fish passage project“116: SR 116 is closed to all travelers between Shotwell Place and Chimacum Creek Drive. The highway will remain closed around the clock through the end of October. Detour via Rhody Drive (State Route 19), Irondale Road and Chimacum Road. Work is for a <a href="https://wsdot.wa.gov/construction-planning/search-projects/us-101-sr-116-north-olympic-peninsula-remove-fish-barriers">fish passage project</a>.”
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  SR 9 has single-lane closures near Kalloch Road until Sept. 14“009: SR 9 is reduced to a single lane near Kalloch Road (MP 59) with a signal alternating northbound and southbound traffic through a bypass road for 42 days, until Sept. 14 for fish passage construction. Expect delays in the area.”
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  Additional paving work on SR 9 near Nugents Corner will alternate traffic Aug. 31 through Sept. 1“009: Northbound and southbound traffic will alternate north of the SR 542/Nugents Corner roundabout (milepost 84) from 6 a.m. to 6 p.m. Monday, Aug. 31 for paving work. Expect delays in the area. This work needs dry weather and may be rescheduled to Tuesday, Sept. 1.”
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  WSDOT notes expected delays of up to 10 minutes on SR 155 near Grand Coulee Bridge“155: Travelers on SR 155 near the Grand Coulee Bridge will encounter alternating one-lane, two-way traffic, reduced speed limits, and flaggers at MP28 until the end of August 2026, seven days a week from 6 a.m.-6 p.m. while crews perform emergency repairs on the bridge deck. Expect delays of up to 10 minutes. No loads over nine feet wide will be allowed during the project.”
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  The emergency repairs on SR 155 near Grand Coulee Bridge will last through Aug. 31“155: Travelers on SR 155 near the Grand Coulee Bridge will encounter alternating one-lane, two-way traffic, reduced speed limits, and flaggers at MP28 until the end of August 2026, seven days a week from 6 a.m.-6 p.m. while crews perform emergency repairs on the bridge deck. Expect delays of up to 10 minutes. No loads over nine feet wide will be allowed during the project. Effective: Aug 24, 2026, 10:50 AM Expected end: Aug 31, 2026, 6:40 PM”
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  Detours are posted for all closuresNo usable supporting receipt — unverified.