Just came across this and thought it was very helpful. Really helpful for people that travel across the country with horses and need a place to rest up for a few hours or a few days. You can click on the map and see more details on each place.
It shows free as well as locations and what the fees are for all. I looked at a few in Arizona and I like hat they showed the BLM land.
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Tonya Wiertzema says
Please list our Equestrian Facility we offer Hookups and stalls only 4 miles from I 17