Traffic backed up for as much as 10 miles over the weekend on Interstate 90 at Snoqualmie Pass in Washington, as road crews continued to repair roadway damaged by a rockslide and take preemptive steps against a future slide.

According to the Washington Department of Transportation, road crews are still working to insert 20-foot-long threaded bolts into unstable rock surfaces hovering high above the roadway, in hopes of securing it to the more secure bedrock below.

Last week, construction contractors and geologists working on the slope removed 20 dump truck loads of rock, including two large boulders, one weighing approximately 20,000 pounds and the other approximately 4,000 pounds.

A safety fence was also installed to keep the boulders and other falling debris within the closed-off westbound lanes.

In addition to dangers from the rocks, motorists themselves have also been a headache for work crews. Contractors have been forced to shut down their large work lights and only work during the day, because of gawking drivers who slow down to check out the destruction, causing even greater backups in the area.

Traffic managers are trying to find ways to make sure increased travel for the upcoming Thanksgiving holiday weekend doesn’t cause severe backups on Interstate 90, or on the alternate routes of U.S. 2; Stevens Pass; and Washington Route 12, White Pass.

One eastbound and one westbound lane remain open, with a speed limit within the work zone of 35 mph. Oversize loads are not allowed, and backups are to be expected during periods of heavy traffic.

No estimate for when the roadway will fully reopen has been given.

For up-to-date information, motorists can visit the WSDOT pass Web site at wsdot.wa.gov/traffic.