Walkup Skydome

The J. Lawrence Walkup Skydome is an indoor multi-purpose stadium in the western United States, located on the campus of Northern Arizona University (NAU) in Flagstaff, Arizona. Opened in September 1977, it is the home of the NAU Lumberjacks football and basketball teams of the Big Sky Conference. The seating capacity is 16,230, with 15,000 permanent seats and 1,230 seats in portable bleachers. The Walkup Skydome has hosted five Big Sky men's basketball tournaments: 1987, 1997, 1998, 2005, and 2006.

For its first six years, the Walkup Skydome was the world's largest clear-span timber dome, until the completion of the Tacoma Dome in Tacoma, Washington, in 1983. The architect was Wendell Rossman of Phoenix, also responsible for many other buildings on the surrounding NAU campus. The wood used in construction of Walkup Skydome was Southern Yellow Pine. At its launching in 1977, it was the third indoor football stadium in the Big Sky Conference: Holt Arena at Idaho State in Pocatello opened in 1970 (as the "Minidome") and the Kibbie Dome at Idaho in Moscow was enclosed in 1975. The Skydome is named after J. Lawrence Walkup (1914–2002), the president of NAU from 1957 to 1979, a period of tremendous growth for the university. During an era of tight budgets in the mid-1970s, he creatively coordinated financing for the venue. More than half of the $8 million project came from voluntary student fee increases, supplemented with $1.5 million in legislative funding and a campus fund of $2 million from two decades of vending machine revenue. The athletic director at NAU at the time was Hank Anderson, who served from 1974 through 1983. The two-year-old Skydome was named for Walkup after his retirement in 1979.

The playing surface is at an elevation of 6880 ft above sea level, second only to Wyoming's War Memorial Stadium, by 335 ft. Originally AstroTurf, the playing surface for football was changed to infilled FieldTurf in 2002.

Besides sporting events, the arena is also used for commencement ceremonies, concerts, and other events such as conventions and trade shows. The arena floor features 97,000 sqft of space.

The Walkup Skydome is also used by the NFL's Arizona Cardinals during their summer training camp, held at NAU. The Cardinals are able to move inside to conduct practice when the weather is unsuitable outdoors.

Renovation
The building underwent a major renovation from December 2010 to September 2011 at a cost of $26 million. The scope of the project included bringing the fire, life, and safety up to code while remodeling the bathrooms, concourse, offices, suites, locker rooms, and press box. The athletic training and equipment on the main floor were also remodeled and three elevators were added to the complex. Fans now enter the building to a panoramic view of the field on the East and west concourses. Capacity was reduced to 10,000 but now feature 21 in wide chair back seating.