A 20-mile-long traffic backup is adding an extra two hours to the westbound journey across Snoqualmie Pass, the state Department of Transportation is reporting.
The traffic snarl began early Monday afternoon, and it is expected to last at least through later Monday night.
The state is advising motorists to consider taking White Pass or Chinook Pass to reach Western Washington instead of Snoqualmie Pass or Stevens Pass.
The backup is in an area that construction crews have been working to eliminate landslide risks on the highway. That construction had closed down the pass in recent weeks during a short period during the early evening daily to allow for blasting activity.
The state, however, shut down that blasting for the Memorial Day weekend.
Meanwhile, traffic continues to be heavy near Burlington near I-5 as traffic detours around the fallen span of the I-5 Skagit River bridge.
One span of that bridge collapsed Thursday night after being hit by an oversized load being carried on a truck from Canada.
The state said it is working to have a temporary replacement for that span installed by mid-June. A permanent replacement will be moved into place this fall