 July 26, 2024
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Plan for 2-week closure of on- and off-ramps, nighttime I-5 lane reductions
 Beginning at 8 p.m. Monday, July 29, travelers should expect to see construction activities along the southbound Interstate 5 interchange at Slater Road north of Bellingham. Our contractor crews will remove the old, compact roundabout and install a new, larger, two-lane roundabout on Slater Road between Rural Avenue and I-5.
- From 8 p.m. to 4 a.m. Monday, July 29 and Tuesday, July 30, the southbound I-5 off-ramp to Slater Road will close for intersection improvements.
- From 8 p.m. to 4 a.m. Wednesday, July 31, the Slater Road on-ramp to southbound I-5 will close these intersection improvements.
Mid-September, you should expect a continuous two-week closure of the southbound I-5 on- and off-ramps at Slater Road. Signed detours will guide people around the ramp closures.
You should expect nightly single-lane closures on southbound I-5 between 8 p.m. and 6 a.m. throughout until construction completes in early 2025. People traveling in this area should plan extra time and expect delays.
Southbound I-5 to Slater Road off-ramp detour map
 Slater Road to southbound I-5 on-ramp detour map
 The new, larger roundabout will replace one WSDOT built in 2014 to better manage congestion and improve safety through this corridor. This interim roundabout has successfully and safely kept traffic moving but is due for an upgrade.
Besties, thank you for your patience during this full closure.
 Did you see the construction activities on State Route 546, near Northwood Road in Lynden this week? Contractor crews made modifications to the wing walls of the fish passage structure that runs under SR 546. From 8 a.m. to 4 p.m., Monday, July 29 and Tuesday, July 30, expect to see single lane closure for powerline work.
 Fish passage work removes barriers and improves the ability of fish to move through waterways. This project gained an estimated 3,094-feet of habit for native species of fish, like trout and salmon, to more easily navigate the creek.
We installed new lighting along the Iowa Street on-ramp to northbound I-5 on Thursday night, July 25, and we’ll be back in Bellingham next week to update the guardrail along the ramp.
To do that work, we will need to close the ramp from 8 p.m. Wednesday, July 31, to 5 a.m. Thursday, Aug. 1. A signed detour will guide people to the Lakeway Drive on-ramp to northbound I-5 during the closure.
Wednesday night’s work will mark the completed of the Northwest Region Breakaway Cable Terminal Replacement project, which updated 24 guardrails and barriers across Whatcom, King and Snohomish counties since work began in March.
 Just can’t wait to get “On the Road Again” this weekend, Traveller? Use our Paint Map as your “Companion,” whether you’re going to see Chris Stapleton, Sheryl Crow and Willie Nelson Saturday, July 27, at T-Mobile Park, the Torchlight Parde Saturday in downtown Seattle, or anywhere else.
So many events and so much construction, it may seem impossible to avoid getting “Stuck” in traffic. No need for “A Deep Slow Panic,” though. Be prepared, be patient, and recognize there’s a lot of people trying to get where they want to go. Leave early, plan for delays, and consider alternate forms of travel, such as mass transit, carpooling, Ferries or Amtrak Cascades, especially in and out of Seattle on Saturday.
Wherever you’re headed to “Soak Up the Sun” or enjoy some “Sunny Days,” remember that we are right in the heart of wildfire season. There are several highways around the state closed for firefighting operations. While some highways may reopen, others may close on a moment’s notice.
- Always check our mobile app or real-time travel map before you route plan/head out.
- Always obey road closure signs and give fire crews plenty of room to work.
We often have special events and roadwork taking place in the Northend, including construction projects, maintenance and repairs. We always try to minimize any effects to travel, but sometimes it is necessary to close a lane to do the work or create a safe work zone for our crews.
While we aren't doing a lot of roadwork this week, our crews will still be out monitoring and keeping the roads safe. If you spot them, slow down and give them space to work! A huge thanks to our crews for all their hard work through the holidays.
Want more information? Visit our real time travel center, where these projects and repairs can be found on our travel map, and download our app to receive alerts directly to your smartphone.
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Sunday, July 28 to Wednesday, July 31
- Nightly from 8 p.m. to 5 a.m. Sunday, July 28 to Wednesday, July 31, the left lane of southbound Interstate 5 near N Lake Samish Drive (between mileposts 246 to 245) will close for upcoming fish passage work happening in 2025.
Monday, July 29 to Tuesday, July 30
- Daily, from 8 a.m. to 4 p.m. Monday, July 29 and Tuesday, July 30, contractor crews will alternate traffic on State Route 546 (Badger Road) in Lynden between Northwood Road (milepost 4) and Trapline Road (milepost 5) for construction related to the Kamm Ditch Fish Passage project.
Monday, July 29 to Wednesday, July 31
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From 8 p.m. to 4 a.m. Monday, July 29 and Tuesday, July 30, the southbound I-5 off-ramp to Slater Road will close for intersection improvements. From 8 p.m. to 4 a.m. Wednesday, July 31, the Slater Road on-ramp to southbound I-5 will close these intersection improvements.
- From 7 a.m. to 5:30 p.m. both directions of SR 20 near Ranger Road (milepost 105) flaggers will alternate through a single lane for utility work.
Monday, July 29 to Friday, August 2
- From 7 a.m. to 4 p.m. both directions of SR 542 between Casey Road and Czech Road (mileposts 23 to 34), flaggers will alternate traffic through a single lane for PSE utility work.
- Until further notice, from 7 a.m. to 5:30 p.m. Monday through Friday, contractor crews will intermittently alternate traffic on State Route 20 east of Concrete between Sauk Store Road (milepost 94) and Hornbeck Lane (milepost 95) for road construction related to a fish passage project. The work is expected to end at noon on Fridays.
- From 8 p.m. to 5 a.m., Monday, July 29 and Tuesday, July 30, the left lane of southbound Interstate 5 near N Lake Samish Drive (between mileposts 246 to 245) will close for upcoming fish passage work happening in 2025. Additionally, from 8 p.m. Wednesday, July 31 until 5 a.m and again Thursday, August 1, the southbound Interstate 5 off-ramp to Lake Samish Road will close (exit 240) will close for the upcoming fish passage work.
Tuesday, July 30
- 10 p.m. to 5 a.m., the left lane will close on southbound I-5 near Northwest Ave (milepost 257) guardrail repairs.
Wednesday, July 31
- From 7 p.m. to 5 a.m. both directions of SR 544 and Hannegan Road (milepost 2), flaggers will alternate traffic through a single lane for PSE utility work.
- From 7:30 p.m. to 6:30 a.m., the right lane on northbound I-5 near SR 20/W Rio Vista Ave (milepost 230) will close for guard rail repairs.
- From 8 p.m. Wednesday, July 31 to 6 a.m. Thursday, Aug. 1, construction crews will close the southbound Interstate 5 on-ramp from Slater Road south of Ferndale for roadwork in preparation for the Slater Road interchange roundabout project.
- The Iowa Street on-ramp to northbound I-5 will close from 8 p.m. Wednesday, July 31, to 5 a.m. Thursday, Aug. 1, for guardrail updates. A signed detour will lead people to the Lakeway Drive on-ramp to I-5.
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