The Washington State Department of Transportation is keeping a close eye on traffic on Interstate 90 through the Snoqualmie Pass , where a rockslide on Sunday, Nov. 6, closed the roadway and forced officials to reroute traffic to two adjacent lanes.

Although traffic was flowing well through the detour on Tuesday morning, Nov. 8, WSDOT officials were concerned that it could start to bottleneck at any time, which could lead to significant delays, according to a press release.

WSDOT crews opened the two lanes late Monday evening, Nov. 7.

“We want to remind drivers the highway is no where near capable of handling full capacity, an estimated 28,000 vehicles each day,” said Casey McGill, WSDOT assistant regional administrator, in the release. “We expect delays as soon as 10 a.m. as more people get word the pass is open and traffic picks up.”

McGill said he wanted to remind drivers that long-haul trucks are permitted on the Interstate 90 pass, but oversized vehicles are not.

No date has been set for completing the work required to re-open all lanes to traffic.