Infrastructure

I-405, I-5, SR 527 closures start this week

Monday, August 31, 2026

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WSDOT announced multiple lane closures affecting Wenatchee-area highways starting Monday, Aug. 31.

Southbound I-405 will have up to two lanes closed overnight Thursday, Sept. 3 to Friday, Sept. 4, from milepost 12 to Coal Creek Parkway. Northbound I-405 will have up to four lanes closed nightly from milepost 11.5 to 13.7 between 9:30 p.m. and 4:30 a.m. until Sept. 4. The right lane of northbound SR 527 will be closed overnight Monday, Aug. 31, to Tuesday, Sept. 1.

I-5 will see reduced lanes nightly from 8 p.m. to 5 a.m. near Alger/Lake Samish Road (exit 240) through Sept. 10 and north of North Lake Samish (exit 246) through Sept. 4 for fish passage construction. SR 4 will have a single lane closed weekdays from 7:30 a.m. to 5 p.m. between 50th and 42nd Avenues through Sept. 11 for gas main work.

📄 Source: WSDOT — Highway Construction & Closures — https://wsdot.wa.gov/travel/road-construction

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WSDOT announced multiple lane closures affecting Wenatchee-area highways starting Monday, Aug. 31No usable supporting receipt — unverified.
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Southbound I-405 will have up to two lanes closed 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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Southbound I-405 will have up to two lanes closed from milepost 12 to Coal Creek Parkway“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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Northbound I-405 will have up to four lanes closed nightly from milepost 11.5 to 13.7“405: Up to four lanes of northbound I-405 from milepost 11.5 to milepost 13.7 will be closed nightly, 9:30 p.m. Monday, Aug. 31 – 4:30 a.m. Friday, Sept. 4.”
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Northbound I-405 will have up to four lanes closed between 9:30 p.m. and 4:30 a.m.“405: Up to four lanes of northbound I-405 from milepost 11.5 to milepost 13.7 will be closed nightly, 9:30 p.m. Monday, Aug. 31 – 4:30 a.m. Friday, Sept. 4.”
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Northbound I-405 will have up to four lanes closed until Sept. 4No usable supporting receipt — unverified.
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The right lane of northbound SR 527 will be closed overnight Monday, Aug. 31“527: The right lane of northbound SR 527 at the I-405 ramps (milepost 2.6 to milepost 2.95) will be closed overnight from 11:59 p.m. Monday, Aug. 31 to 5 a.m. Tuesday, Sept. 1.”
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The right lane of northbound SR 527 will be closed to Tuesday, Sept. 1“527: The right lane of northbound SR 527 at the I-405 ramps (milepost 2.6 to milepost 2.95) will be closed overnight from 11:59 p.m. Monday, Aug. 31 to 5 a.m. Tuesday, Sept. 1.”
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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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I-5 will see reduced lanes through Sept. 10 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. More information on the <a href="https://wsdot.wa.gov/construction-planning/search-projects/i-5-tributaries-friday-lake-chuckanut-creeks-fish-passage">project webpage</a>. Effective: Aug 14, 2026, 12:55 PM Expected end: Sep 10, 2026, 5:00 AM”
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I-5 will see reduced lanes nightly 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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I-5 will see reduced lanes through Sept. 4 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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SR 4 will have a single lane closed through Sept. 11 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.”