This route is an excellent addition to the FKTs of South Dakota. It gave me an opportunity to explore the park on a trail I would've skipped otherwise.
I ran this solo unsupported starting about 6:15pm on a cool day ~70*F. I took no water or gels since it was just 7 miles. I ran the loop CCW just to choose a direction. I don't believe one direction has any advantage over the other. The weather seems like it had been dry for a few days and the trail was 98% dry. There are low spots and you're certainly getting your feet wet. It's best to stay on the trail since the flooded areas have boards lining the trail surface. Trying to go around will put you in the mud. Definitely don't run the trail in wet weather or after recent rains. It will be very difficult and damaging to the trail as at least half the trail is in washes. They are smooth and fast when dry. Watch for the pink poles to mark the route. It can be easy to lose the route in the large washes.