MINNEAPOLIS — Construction of the new Minnesota Vikings stadium has reached several milestones this week.

The last structure concrete was poured on Thursday, and more than 1,200 workers on site were treated to a lunch in celebration. Since the project began in early 2014, roughly 10,000 truckloads delivered 100,000 cubic yards of concrete. That’s enough to fill more than 30 Olympic-sized swimming pools.

The Minnesota Sports Facilities Authority also announced the connection on Thursday of the roof ridge truss, to allow completion in the coming weeks. The chord joining the two sides of the roof comprises 12 pieces of steel, each 50 feet long and weighing 60,000 pounds.

The stadium is scheduled to be fully enclosed by November.