It’s about the size of the small dressage arena but I think it’s slightly narrower, so yes, pretty small and no outdoor. I’m in he process of casually looking at what else is available boarding wise. I don’t think they built the arena, I think it was already there when they bought the property. There’s room to enlarge it but I doubt that’s going to happen.
BOs are pretty much “do whatever you want in the arena” type of people. I don’t know a lot about barrel racing but do know it’s not something I want to try. I rode the other night with one other person who does run barrels. We managed to stay out of each others’ way but it was a bit difficult because she never looked where she was going.