The final five ft of a 1.7-mile underground bore for what was once the world’s largest tunnel-boring machines in downtown Seattle marked a major milestone for a much-maligned project.
Arriving in the receiving pit April 4 near the Space Needle roughly 29 months late, the next phase of replacing the aging Alaskan Way Viaduct with an underground State Route 99 can move forward toward an expected opening date of 2019.