This is an old railroad bed from the gold mining days with a short piece of single track. Basically follow the main trail and switch backs till you get to the 4 wheel drive road that takes you above tree line to the top of Argentine Pass. The climb is an easy one with minimal technical parts. The altitude will make it more difficult for those that aren't accustomed. A fun ride back down!
How to get there:
From Denver take I-70 west to the Silver Plume exit. Go down ramp turn left then first right onto a gravel road used for parking at the Georgetown Railroad. Park and then ride up the road to the first left which is marked by the forest service. All up hill from there.