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WSDOT says that construction will begin on Tuesday night for the southbound lanes in Ferndale.
Congestion is expected to be at its heaviest between 11 a.m. and 5 p.m. Saturday and Sunday.
Repairs made to the bridge will fix the failing paint system, corrosion and pack rust to metal elements, missing fasteners and leaking joints among other things.
Drivers are advised to plan for delays using alternative routes.
Drivers should expect delays in Seattle this weekend and overnight in north Bellingham starting Sunday night.
The lane was closed for about five hours and caused mile-long backups.
According to the city, this improves visibility when exiting spaces and prevents drivers from blindly backing into moving traffic.
Input on the final design is being accepted until September 30th.
Traffic may be impacted in parts of Bellingham as crews work to repair roads and more.
The closure caused an estimated seven-mile backup on the interstate on Monday afternoon.