I-405, I-5, SR 4 closures in Vancouver, WA

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  I-405 southbound will close overnight 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 will start at 9 p.m. Thursday, Sept. 3“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 end at 5 a.m. 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 see reduced lanes nightly from 8 p.m. to 5 a.m. near Alger/Lake Samish Road (exit 240)“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 reduced lanes on I-5 will continue through Sept. 4 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 left lane of northbound I-5 will close nightly from 8 p.m. to 5 a.m. Sunday, Aug. 30“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.”
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  The closure of the left lane of northbound I-5 will end on Friday, Sept. 4“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.”
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  The closure of the left lane of northbound I-5 will be north of North Lake Samish (exit 246)“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.”
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  SR 4 will have a single lane closed weekdays from 7:30 a.m. to 5 p.m. between 50th and 42nd Avenues“004: Monday, Aug. 17 through Friday, Sept. 11: A single lane in both directions of SR 4 between 50th Avenue (milepost 56.4) and 42nd Avenue (milepost 57.2) will be closed weekdays from 7:30 a.m. to 5 p.m., for buried gas main line extension work.”
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  The single lane closure on SR 4 will continue through Sept. 11 for gas main work“004: Monday, Aug. 17 through Friday, Sept. 11: A single lane in both directions of SR 4 between 50th Avenue (milepost 56.4) and 42nd Avenue (milepost 57.2) will be closed weekdays from 7:30 a.m. to 5 p.m., for buried gas main line extension work.”
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  SR 730 will have flagger-controlled alternating traffic Monday through Friday from 6 a.m. to 6 p.m.“730: SR 730 between the Jct. of US 12 and the Oregon State Line milepost 0 to 6: Monday through Friday from 6 a.m. to 6 p.m. until further notice, there will be flagger and pilot vehicle controlled alternating traffic for roadwork.”
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  The flagger-controlled alternating traffic on SR 730 will continue through Sept. 18“730: SR 730 between the Jct. of US 12 and the Oregon State Line milepost 0 to 6: Monday through Friday from 6 a.m. to 6 p.m. until further notice, there will be flagger and pilot vehicle controlled alternating traffic for roadwork. Effective: Jun 7, 2026, 9:48 PM Expected end: Sep 18, 2026, 6:00 PM”