Military Praises South Industries Monolithic Dome Project At Fort Irwin, Colorado, this 75-foot-diameter dome is equipped with windmills and solar collectors. The dome that houses the Headquarters Office is 75′ × 15′ on a 20’ integrated stemwall and has a protected entry archway. On its interior, the Headquarters Office dome has sound damper panels. The second staging dome has a 75’ diameter. This dome is much larger than it appears.