I was out near Parkdale trestle on Sunday. It is really a mess, but I also may think that someone has been taking pieces of wood from the bridges and using them to repair some smaller creek crossings further back in the woods. It looked like some of these smaller "palettes" may have been burned recently, and some of the planks look freshly nailed. Perhaps someone is making use of the trestle wood to refurbish other smaller bridges further back in the woods. Just a guess, though.
Also, I was parked across from the house on Applejack three weeks ago for about two hours, and neither did I see now hear anyone at the house, although someone who had been geocaching earlier in the day had said that they saw the man looking at them the whole time the hiked back into the offroad portion of Appplejack.