The Great Deflation is scheduled for Jan. 18.

That’s the day permanent power will be cut off to the Metrodome, which means there will no longer be air holding up the puffy white roof, which means it will quickly sink, construction officials said Friday at a meeting of the public stadium authority.

Dismantling will follow over several weeks, said Mortenson Construction senior vice president John Wood. The steel support cables will be recycled, he said, and the roof fabric will be cut up into pieces and possibly reused. (After the Metrodome roof collapsed under heavy snow three years ago, Minnesota-based Duluth Pack made a line of bags out of the roof material.)

The roof is just one of the elements of the 31-year-old sports arena that needs to be disposed of as its end draws near. The last scheduled Vikings game is Dec. 29. A new, $1 billion stadium will open in place of the Dome, on the same site, in July 2016.

Ted Mondale, executive director of the Minnesota Sports Facilities Authority, said officials expect to publish guidelines early next week laying out how they’ll dispose of surplus property from the Dome.

Some items have already been put up for sale on the state’s auction site.

One tricky question is what to do with the stadium seats, which several groups have requested but which would be time-consuming and expensive to remove, MSFA chair Michele Kelm-Helgen said.

In other business from Friday’s meeting, expected to be the authority’s last at the Metrodome:

— Authority member Barbara Butts Williams reported on performance evaluations for Mondale and Kelm-Helgen. She praised both for “excellent leadership” and said a proposed raise for Kelm-Helgen is being developed and will be considered at next month’s meeting. She declined to give an amount.

A year ago, the authority approved salaries of $160,325 for Mondale and $102,000 for Kelm-Helgen.

— Officials released cost figures from the Dec. 3 ceremonial groundbreaking for the new stadium. A total of $18,850 from the project budget was spent on the event for equipment rental, food and drinks, decorations and other items. Mortenson paid for the shovels and hard hats, and the Vikings chipped in for flowers, fireworks and other items, an authority spokeswoman said.

— Officials expect to hear this month whether the new stadium will be picked to host college football’s 2017 Bowl Championship Series final game. The stadium is one of several finalists and the only cold-weather venue, Kelm-Helgen said. If Minnesota gets the contract, it will be the first major event at the new stadium after the Vikings’ 2016 season. Any playoff games the Vikings might play in January 2017 wouldn’t interfere with hosting the event, officials said.

— Stadium officials will host a neighborhood meeting on the project Jan. 9.

Doug Belden can be reached at 651-228-5136. Follow him at twitter.com/dbeldenpipress.