This must be one of the all time easiest summits to get to. The dirt road is graded with no gravel. The only way to know you're not on asphalt are the occassional potholes. The summit is very large and surrounded with trees that obscure any view of the surrounding vistas. There is a lot of trash scattered around from clay shooting with a large fire ring indicating a party destination. The actual summit is a small knoll to the west of the flat area where I set up both a 2m "J" pole and a random wire HF antenna.
No directions are necessary, but you can find some here for nearby Mill Creek Ridge that may help: http://www.pnwsota.org/blog/kf7sey/2018-december-11/mill-creek-ridge-or-july-2018. I just plugged in Dorn Peak, Oregon into Google Maps and it got me there with no hiccups.
