A bit of basic frost damage and erosion. Not sure how much is winter and how much is fall and spring. It just needs a bit of regular maintenance, always had since they "finished" it. You can probably ride it on a regular bike, just keep you eyes open.

I rode it many years back, when it was all grassed over and there was a really narrow trail. The grass kept everything anchored and it didn't erode. The finished trail opened it up to that.