On one Dome Plateau sidetrip to see an arch, Doug and I found that it had collapsed. the collapse looked very recent. Turns out it was Arrowhead Arch and it collapsed some time in 2010 - very recent by geological standards but we were not the first to see it. http://www.myxj.net/g2/d/171036-2/IMG_5680.jpg
The turnaround spot is very small, maybe only room for 4-5 rigs parked carefully. However, the main road is a 5 minute walk away so it would be possible to park there and walk in.