Oops, so I forgot to post this. Last Wednesday was the 10th race in the Prairie City Racing Series and was held under hot, but clear skies. I didn't get a chance to race (travelling again), but we found the course gps map:
It looks like the course was 3.66 miles and 430 elevation, running down the valley through the normal part of the park. Results have been posted here and photos are here and here.