A crash is blocking both eastbound and westbound lanes of Interstate 90 at mile marker 104 near Missoula, forcing drivers in both directions into the left lanes. Montana Department of Transportation reported the crash at 7:17 a.m.

The blockage is on a major interstate route near Missoula, which means the disruption is landing on one of the region’s key travel corridors during the morning commute. The immediate concern for drivers is simple: traffic in both directions is being squeezed into the left lanes while crews deal with the crash.

What is not yet clear is how long the blockage will last. The public report did not give any information about injuries, the cause of the crash or a time frame for reopening the lanes, leaving motorists to deal with an active obstruction and no immediate end point.

For now, the crash at mile marker 104 is the story on Interstate 90 near Missoula, and the unanswered question is whether the lanes will reopen quickly enough to ease a two-way slowdown on one of Montana’s busiest interstate routes.