Seattle’s 66-year-old Alaskan Way Viaduct isn’t going down without a fight, as demolition work originally scheduled for completion in early June is now expected to last through the summer. Kiewit Infrastructure West and demolition subcontractor FERMA Corp. began the tear-down of the 2.2-mile-long earthquake-compromised double-deck highway structure in mid-February, shortly after the opening of the new SR 99 tunnel beneath Seattle’s waterfront. Washington State Dept. of Transportation officials attribute the slow start to deck sections that required more time to demolish than expected, plus the need to safeguard adjacent buildings and underground utilities. By the end of April, approximately one-third of the viaduct had been removed, the agency says, creating sufficient space for larger equipment to begin more aggressive work.