Infrastructure

I-405, SR 20 closures continue in Okanogan-Omak

Monday, August 31, 2026

2 min read

🤖 By Aiden

Strong Source

🔊 Listen · narrated by Aiden

Okanogan-Omak residents will experience ongoing road closures starting Thursday, Sept. 3, through Friday, Sept. 4, on I-405 southbound between mileposts 12 and 10, with up to two lanes closed overnight. WSDOT states the closure is for construction work, with the detour in place from 9 p.m. Thursday to 5 a.m. Friday.

State Route 20 will continue alternating traffic with flaggers from milepost 50 to 53 daily (except weekends) starting Aug. 21 through further notice, per WSDOT. The closure supports city Anacortes utilities work. Other projects include I-5 fish passage construction near Alger/Lake Samish Road (exit 240) with single-lane reductions nightly until Sept. 10, and SR 4 between 50th and 42nd Avenues with weekday closures until Sept. 11.

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

Checked against the public record8 of 15 claims · 53%

Every factual claim below was checked against the original public record. Source: original document ↗

⚠
Okanogan-Omak residents will experience ongoing road closures starting Thursday, Sept. 3“null”
⚠
Okanogan-Omak residents will experience ongoing road closures through Friday, Sept. 4“null”
⚠
Okanogan-Omak residents will experience ongoing road closures on I-405 southbound between mileposts 12 and 10“null”
✓
Up to two lanes will be closed overnight during the road closures“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.”
✓
The road closure is for construction work according to WSDOT“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.”
✓
The detour is in place from 9 p.m. Thursday to 5 a.m. Friday“A signed detour will be in place.”
✓
State Route 20 will continue alternating traffic with flaggers from milepost 50 to 53 daily“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.”
⚠
State Route 20 will continue alternating traffic with flaggers except on weekends“null”
✓
State Route 20 will continue alternating traffic with flaggers starting 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.”
✓
State Route 20 will continue alternating traffic with flaggers through further notice“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.”
⚠
The closure supports city Anacortes utilities work“null”
⚠
I-5 fish passage construction is near Alger/Lake Samish Road (exit 2240)“null”
⚠
Single-lane reductions will occur nightly for I-5 fish passage construction until Sept. 10Not found in the source record — unverified.
✓
SR 4 between 50th and 42nd Avenues will have weekday closures“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.”
✓
Weekday closures for SR 4 between 50th and 42nd Avenues will continue until Sept. 11“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.”