I-405, I-5, SR 599 closures this weekend

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  I-405 southbound will close up to two lanes from milepost 12 to Coal Creek Parkway Southeast overnight“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 will occur on 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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  I-5 will reduce to a single lane nightly near Alger/Lake Samish Road for fish passage construction“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.”
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  The reduction of I-5 to a single lane will occur from Monday, Aug. 31 through Friday, Sept. 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.”
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  I-405 northbound will close all lanes from Northeast 70th Place to Northeast 85th Street“405: All lanes of northbound I-405 will close from Northeast 70th Place to Northeast 85th Street from 11 p.m. Friday Aug. 28 to 5 a.m. Monday, Aug. 31. A signed detour will be in place.”
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  The closure of I-405 northbound will occur from 11 p.m. Friday, Aug. 28 to 5 a.m. Monday, Aug. 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.”
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  State Route 599 will close the right lane and off-ramp to Tukwila International Boulevard“599: From 9 p.m. Friday, Aug. 28 to 5 a.m. Saturday, Aug. 29, the right lane of northbound State Route 599 and the off-ramp to Tukwila International Boulevard (milepost 1) will close for maintenance.”
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  The closure of State Route 599 will occur from 9 p.m. Friday, Aug. 28 to 5 a.m. Saturday, Aug. 29“599: From 9 p.m. Friday, Aug. 28 to 5 a.m. Saturday, Aug. 29, the right lane of northbound State Route 599 and the off-ramp to Tukwila International Boulevard (milepost 1) will close for maintenance.”
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  SR 547 will alternate traffic with flaggers weekdays from 9 a.m. to 3 p.m.“547: Weekdays from 9 a.m. to 3 p.m. beginning Monday, Aug. 24 until noon Friday, Sept. 4, State Route 547 traffic will alternate with flaggers from State Route 542 (milepost 0) to Frost Road (milepost 6) will close for PSE utilities work.”
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  The alternation of traffic on SR 547 will begin on Monday, Aug. 24“547: Weekdays from 9 a.m. to 3 p.m. beginning Monday, Aug. 24 until noon Friday, Sept. 4, State Route 547 traffic will alternate with flaggers from State Route 542 (milepost 0) to Frost Road (milepost 6) will close for PSE utilities work.”
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  The alternation of traffic on SR 547 will end at noon on Friday, Sept. 4“547: Weekdays from 9 a.m. to 3 p.m. beginning Monday, Aug. 24 until noon Friday, Sept. 4, State Route 547 traffic will alternate with flaggers from State Route 542 (milepost 0) to Frost Road (milepost 6) will close for PSE utilities work. Effective: Aug 21, 2026, 2:18 PM Expected end: Sep 4, 2026, 12:00 PM”
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  The alternation of traffic on SR 547 is for PSE utilities work“547: Weekdays from 9 a.m. to 3 p.m. beginning Monday, Aug. 24 until noon Friday, Sept. 4, State Route 547 traffic will alternate with flaggers from State Route 542 (milepost 0) to Frost Road (milepost 6) will close for PSE utilities work.”