The three Ross-credited designs in Colorado are Lakewood, the Broadmoor, and Wellshire, which is a Denver muni. Lakewood and Wellshire always seems to me like very probably candidates for courses where Ross simply drew up a routing and mailed it back for someone else to build. I don't know if that's the case at all, but having played those courses I had that general sense.
Lakewood is itself generally credited both to Ross and Tom Bendelow. What that indicates about Ross' actual involvement isn't really all that clear to me.
Lakewood is an enjoyable course, but the roads around it have grown up to be quite a nuisance, as you say.
Does a Ross expert know if he ever actually visited Colorado? What was his actual involvement with the Broadmoor?