By Vinod Ram 
Drivers across the Seattle metro area are bracing for one of the most disruptive traffic weekends of the year. The Washington State Department of Transportation (WSDOT) is shutting down all lanes of Interstate 405 in Bothell from March 13–16 as crews remove a key ramp as part of a long-term expansion project.
The closure marks a critical milestone in a series of major upgrades planned for the corridor through 2028. According to WSDOT, the region is nearing what transportation planners call a “transportation tipping point.” With population growth and rising commuter demand, temporary disruptions like this are becoming unavoidable as infrastructure catches up.
Why I-405 Is Closing This Weekend
The full freeway shutdown will allow construction crews to safely remove an outdated ramp structure connecting several key lanes. The work is part of the broader I-405 Bus Rapid Transit and corridor improvement project, designed to improve travel reliability across the Eastside.
The project also aligns with regional mobility initiatives involving agencies such as Sound Transit and local municipalities.
When the Closure Starts
- Start: Friday, March 13 at approximately 10 PM
- End: Monday, March 16 early morning
- Location: I-405 through Bothell
During this window, drivers traveling between Bellevue, Kirkland, Bothell, and Lynnwood should expect heavy congestion and delays.
Main Detour Routes Drivers Should Know
WSDOT recommends two major detour routes for commuters navigating around the closure:
1. State Route 522 (SR-522)
The SR-522 corridor connects Bothell to Seattle and will serve as the primary east-west bypass for drivers avoiding the freeway closure.
2. State Route 527 (SR-527)
Another alternative is State Route 527, which runs north-south through Mill Creek and Bothell.
However, both routes are expected to experience significantly heavier traffic volumes throughout the weekend.
Best Times to Travel (If You Must Drive)
| Day | Lowest Traffic Window | Peak Congestion |
|---|---|---|
| Friday Night | Before 8 PM | 10 PM – Midnight |
| Saturday | Early Morning (5–7 AM) | 11 AM – 6 PM |
| Sunday | Before 9 AM | 2 PM – 8 PM |
| Monday | Before 6 AM | Morning commute |
For real-time updates, drivers can monitor Washington State traffic cameras and updates throughout the weekend.
Why This Is Just the Beginning
This closure isn’t a one-time inconvenience. Regional planners warn that the Seattle metro area may see several more large construction closures in the coming years.
The long-term improvements aim to support future transit systems, including high-capacity routes discussed by Puget Sound Regional Council transportation planning.
Officials say the current upgrades will eventually reduce congestion and support population growth expected across Snohomish and King counties.
Local Commuter Survival Tips
- Use public transit where possible
- Leave at least 30–45 minutes earlier than usual
- Use live navigation apps like Google Maps traffic routing
- Avoid peak shopping hours near Bothell and Mill Creek
- Consider remote work if your job allows
Share Your Secret Backroads
Many longtime Eastside commuters know the hidden backroads that bypass major highways.
Do you have a shortcut?
Drop your favorite alternate routes in the comments to help fellow drivers survive the Bothell gridlock this weekend.
Community tips often become the best navigation tools during major closures.
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