Infrastructure

I-405 and I-5 Closures Begin Overnight

Sunday, August 30, 2026

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Multiple Washington State Department of Transportation (WSDOT) projects will begin affecting Wenatchee-area highways starting late Thursday night through early Friday morning.

I-405 will close two southbound lanes from milepost 12 to Coal Creek Parkway Southeast from 9 p.m. Thursday, Sept. 3, to 5 a.m. Friday, Sept. 4. I-5 will reduce to a single lane nightly from 8 p.m. to 5 a.m. near Alger/Lake Samish Road (exit 240) through Sept. 4. Both projects are part of fish passage construction and utility work projects.

WSDOT notes that traffic control measures including flaggers and signed detours will be in place during the closures. The agency encourages drivers to allow extra travel time and to be prepared for delays.

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

Source receipts6 of 11 claims supported · 55%

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Multiple Washington State Department of Transportation (WSDOT) projects will begin affecting Wenatchee-area highwaysNo usable supporting receipt — unverified.
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The effects of the projects will start late Thursday night through early Friday morningNo usable supporting receipt — unverified.
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I-405 will close two 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 will occur from 9 p.m. Thursday, Sept. 3, to 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 reduce to a single lane nightly from 8 p.m. to 5 a.m.“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 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 reduction of I-5 to a single lane will be in effect through 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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Both projects are part of fish passage construction and utility work projectsNo usable supporting receipt — unverified.
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WSDOT notes that traffic control measures including flaggers and signed detours will be in place during the closures“A signed detour will be in place.”
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The agency encourages drivers to allow extra travel timeNo usable supporting receipt — unverified.
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The agency encourages drivers to be prepared for delaysNo usable supporting receipt — unverified.