While fans can enjoy school-specific beers at tailgate parties before Friday night’s Rocky Mountain Showdown, they won’t be able to purchase beer inside the stadium, a Denver Broncos spokesman confirmed Wednesday.

Although beer is sold at Broncos Stadium at Mile High during Denver Broncos games, the agreement between Colorado State and Colorado to play their annual college football game at the NFL stadium includes a provision that no beer will be sold from concession stands during the game.

Seth Medvin, a spokesman for the Broncos, said the ban was put in place by the city of Denver following the 1999 Rocky Mountain Showdown at the old Mile High Stadium, when police fired tear gas at hundreds of CSU fans, including the school’s marching band, in what police said was an effort to keep an unruly mob from rushing the field following the Rams’ 41-14 win — CSU’s first over CU since 1986.

This year’s game is the last of 19 between the two schools over the past 21 years to be played at the Denver Broncos’ home stadium. Future games between CSU and CU are scheduled for 2020 and 2024 at Canvas Stadium in Fort Collins and in 2023 at Folsom Field in Boulder.

CSU has sold beer at home football games for many years, first at Hughes Stadium and now at Canvas Stadium, where there’s even a premium party deck, the New Belgium Porch, that was built specifically for beer-drinking in the north end zone.

CU expanded beer and wine sales to all areas of its home stadium, Folsom Field, prior to the 2018 season.

CSU was the first university in the country to get its own branded beer, Old Aggie, made by Fort Collins brewery New Belgium and introduced prior to the 2017 football season. CSU receives a portion of the proceeds from the beer’s sales.

Boulder’s Avery Brewing Co. released a CU-branded beer, Stampede, featuring the school’s Buffalo mascot Ralphie on each can, earlier this month.

Fans attending the Rocky Mountain Showdown will have to pass through metal detectors, just as they do at both Canvas Stadium and Folsom Field, and adhere to the same clear-bag policy that is used by both schools and the NFL. The only bags fans will be allowed to bring into the stadium are clear plastic bags or 1-gallon disposable freezer bags no larger than 12-by-6-by-12 inches. Each fan is permitted to carry one clear bag.

Also banned are: purses, other than clutches no larger than 4½ by 6½ inches; backpacks or seat cushions with zippers, pockets or concealable areas or that are larger than a single piece; artificial noise-makers, airhorns or cowbells; balls of any kind; large golf-sized umbrellas; and laser pointers or pens.

Any blankets or jackets must either fit in the clear bag or be carried loosely to facilitate security screening, and binoculars and cameras cannot be carried in cases. There are no provisions to check prohibited items at the gate.

Fans will be allowed to bring in their own food items, provided they’re carried in the clear plastic bag, as well as bottled water and other non-alcoholic beverages in factory-sealed plastic bottles.

Kelly Lyell covers CSU and other local sports and sports-related news for the Coloradoan. Follow him at twitter.com/KellyLyell and facebook.com/KellyLyell.news and help support the work he and his fellow journalists do in our community by purchasing a subscription at coloradoan.com/subscribe.