Some other closed ones in CO - Continental Divide Raceways in Castle Rock. Closed in the mid 70s. Colo Spgs International Dragway in Colorado Springs, closed in the mid 80s. As mentioend above, Bandimere Speedway, closed a couple years ago although they are working on reopening in another location far east of Denver on the prairie. Won't be able to call themselves Thunder Mountain anymore. A couple are still left, Julesburg in the far north-east part of the state, which is actually one of the oldest remaining strips in the country and Pueblo Motorsports Park.