Starting Point doesn't look like anything but this is it, a hilly dirt parking area. Just park there go up a bit and you will see the trail map posted there.
It is relatively a short trail, I would rate it as black if you straight go up to top of the mountain. There are some rocky areas where you have to walk on them, if you are not that good. Some blue trails here and there.
I finished it in 2 hours taking multiple breaks and mapmyride said 6.1 miles.
This trail continues to improve. I started riding on it about approximately 20 years ago. Back then there was a section that was private property that is no longer part of the system.
Since there there has been some major revitalization There is a new building.
The biggest change is the trails have been redeisigned for some mountain bike specific trails by Barkeater Trail Alliance (BETA) and what a change.
It went from some nice wide x-c ski style trails (which still exist) to some fun single track.
more pictures at https://www.flickr.com/photos/151936158@N02/albums/72157687115647230Dewey Mountain Photos