Rock blasting to shape the Mitchell Point Tunnel will now begin next Tuesday, October 12. The Oregon Department of Transportation had originally planned to start later this week. Once blasting begins, travelers on Interstate 84 between Cascade Locks and Memaloose State Park should plan for long delays Tuesday and Thursday mornings. During rock blasting, rolling slowdowns in both directions of I-84 will be used to create 20-minute windows where there is no traffic. Rolling slowdowns are scheduled to occur on Tuesday and Thursday mornings between 9 a.m. and 11 a.m. for up to four weeks. Travelers should plan for long delays or travel at an alternate time if possible. This work is part of the effort to build the Mitchell Point Tunnel as part of the Historic Columbia River Highway State Trail. Crews are forming a new 655-foot tunnel with drilling and rock blasting. Visit TripCheck.com for schedule updates.