If you scroll the map so that you can see a little further up north you will find some blue lines. I'm playing around with the northern portion of the grade. Take these with a grain of salt as I haven't thoroughly explored all of this. A lot of it is pretty close but there are portion that I am not certain about. Most of my eploration over in this area has started from the S curve in highway 550. From there I make my way over to the grade that heads northeast towards the turntable at corkscrew gulch. The turntable is up at the top were the two grades converge.