Infrastructure

Vancouver Area Road Closures Begin Sept. 21

Monday, September 21, 2026

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Vancouver, WA — WSDOT began multiple road maintenance projects on September 21, 2026, closing lanes on I-5 and State Route 4. The I-5 southbound closure near N Fork Lewis River will last until further notice, starting at 8:06 a.m. SR 4 westbound will close its right lane near 42nd Avenue starting at 8:08 a.m. for gas mainline work. Both directions of SR 4 will have alternating traffic with automatic flaggers between mileposts 50 and 50.5 starting at 9:03 a.m.

Drivers should expect delays on these routes. The closures are for guardrail work and gas mainline maintenance, with WSDOT urging caution. All projects will remain in effect until further notice as stated in the official notices.

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

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Vancouver Area Road Closures Begin Sept. 21“WSDOT highway construction and road closures within 50 miles of Vancouver — 9/21/2026:”
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Multiple WSDOT maintenance projects start today, closing lanes on I-5 and SR 4 with alternating traffic and flaggers.“005 [18 mi from Vancouver]: Maintenance on I-5 southbound from milepost 19.8 near N Fork Lewis River to milepost 19.2 will have the right lane closed for guardrail work, use caution beginning at 8:06 am on September 21, 2026 until further notice. Effective: Sep 21, 2026, 8:06 AM 004 [39 mi from Vancouver]: Construction on SR 4 westbound from milepost 57.2 near 42nd Avenue to milepost 56.7 near 46th Avenue will have the right lane closed for gas mainline work, use caution beginning at 8:08 am on September 21, 2026 until further notice. Effective: Sep 21, 2026, 8:08 AM 004 [44 mi from Vancouver]: Maintenance on SR 4 both directions from milepost 50 near Half Bridge to milepost 50.5 near Stella. Crew will be alternating traffic with automatic (robo) flaggers for guardrail work, follow flagging directions and use caution beginning at 9:03 am on September 21, 2026 until further notice. Effective: Sep 21, 2026, 9:03 AM”
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Vancouver, WA — WSDOT began multiple road maintenance projects on September 21, 2026, closing lanes on I-5 and State Route 4. The I-5 southbound closure near N Fork Lewis River will last until further notice, starting at 8:06 a.m. SR 4 westbound will close its right lane near 42nd Avenue starting at 8:08 a.m. for gas mainline work. Both directions of SR 4 will have alternating traffic with automatic flaggers between mileposts 50 and 50.5 starting at 9:03 a.m.“005 [18 mi from Vancouver]: Maintenance on I-5 southbound from milepost 19.8 near N Fork Lewis River to milepost 19.2 will have the right lane closed for guardrail work, use caution beginning at 8:06 am on September 21, 2026 until further notice. Effective: Sep 21, 2026, 8:06 AM 004 [39 mi from Vancouver]: Construction on SR 4 westbound from milepost 57.2 near 42nd Avenue to milepost 56.7 near 46th Avenue will have the right lane closed for gas mainline work, use caution beginning at 8:08 am on September 21, 2026 until further notice. Effective: Sep 21, 2026, 8:08 AM 004 [44 mi from Vancouver]: Maintenance on SR 4 both directions from milepost 50 near Half Bridge to milepost 50.5 near Stella. Crew will be alternating traffic with automatic (robo) flaggers for guardrail work, follow flagging directions and use caution beginning at 9:03 am on September 21, 2026 until further notice. Effective: Sep 21, 2026, 9:03 AM”
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Drivers should expect delays on these routes. The closures are for guardrail work and gas mainline maintenance, with WSDOT urging caution. All projects will remain in effect until further notice as stated in the official notices.“005 [18 mi from Vancouver]: Maintenance on I-5 southbound from milepost 19.8 near N Fork Lewis River to milepost 19.2 will have the right lane closed for guardrail work, use caution beginning at 8:06 am on September 21, 2026 until further notice. Effective: Sep 21, 2026, 8:06 AM 004 [39 mi from Vancouver]: Construction on SR 4 westbound from milepost 57.2 near 42nd Avenue to milepost 56.7 near 46th Avenue will have the right lane closed for gas mainline work, use caution beginning at 8:08 am on September 21, 2026 until further notice. Effective: Sep 21, 2026, 8:08 AM 004 [44 mi from Vancouver]: Maintenance on SR 4 both directions from milepost 50 near Half Bridge to milepost 50.5 near Stella. Crew will be alternating traffic with automatic (robo) flaggers for guardrail work, follow flagging directions and use caution beginning at 9:03 am on September 21, 2026 until further notice. Effective: Sep 21, 2026, 9:03 AM”

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WSDOT highway construction and road closures within 50 miles of Vancouver — 9/21/2026:

005 [18 mi from Vancouver]: Maintenance on I-5 southbound from milepost 19.8 near N Fork Lewis River to milepost 19.2 will have the right lane closed for guardrail work, use caution beginning at 8:06 am on September 21, 2026 until further notice. 
Effective: Sep 21, 2026, 8:06 AM

004 [39 mi from Vancouver]: Construction on SR 4 westbound from milepost 57.2 near 42nd Avenue to milepost 56.7 near 46th Avenue will have the right lane closed for gas mainline work, use caution beginning at 8:08 am on September 21, 2026 until further notice. 
Effective: Sep 21, 2026, 8:08 AM

004 [44 mi from Vancouver]: Maintenance on SR 4 both directions from milepost 50 near Half Bridge to milepost 50.5 near Stella.  Crew will be alternating traffic with automatic (robo) flaggers for guardrail work, follow flagging directions and use caution beginning at 9:03 am on September 21, 2026 until further notice. 
Effective: Sep 21, 2026, 9:03 AM