The direction and dispersal of fallout will be dictated by high-altitude winds and the jet stream pattern. The "fallout maps" are generic, not specific. I'm putting all this out here for prep, not specific to the Denver scenario. I lived in Pueblo, CO for 5 years and even prepped for blast as well as fallout. Pueblo has no military assets, unless you count the stored mustard agents. It does have a 10,364 ft runway, making it a default Soviet target, based on Soviet doctrine of targeting all runways over 7000ft, the minimum takeoff and landing length for B-52s to operate.