The Park is developing this site to allow horsemen a better experience on the trails of the park. The corrals had just been completed before our visit. Check this GoogleMap to find the entrance. The coordinates at the entrance are N 47 Degrees 20.523' by W116 degrees 47.317' and the elevation is 2593 feet. Here is a view down the center of the facility. To the left are the corrals and to the right are the campsites.
These are some sturdy corrals.
The best campsite.
The second one.
Water for your horses.
Not exactly the Ritz but ....
Appaloosa Trail