MINNEAPOLIS (AP) — The Minnesota Vikings stadium construction site has an important delivery on the way.

Portions of a 400-foot mobile crane began arriving Monday, with a total of 70 truckloads schedule to drop off the sections over a 10-day period. The crane is needed to hoist the steel pieces forming the top of the roof that at its peak will be 300 feet high. The crane will move back and forth, once assembled, on tracks that stand more than 8 feet high.

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There are already five fixed cranes on the site, ranging from 250 to 300 feet high.

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Minnesota Sports Facilities Authority chairman Michelle Kelm-Helgen says 10 percent of the building has already been completed. The stadium is scheduled to open about two years from now.

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