MTB Project Logo

Forest Road No. 578

Extremely Difficult


4.5 mile 7.2 kilometer point to point
Extremely Difficult


Ascent: 1,492' 455 m
Descent: -137' -42 m
High: 10,837' 3,303 m
Low: 9,444' 2,878 m


Avg Grade: 7% (4°)
Max Grade: 38% (21°)


Driving directions Take a virtual tour
Zoom in to see details
Map Key

Trail shared by Ted Stroll

A brutal rocky climb with some hike-a-bike that will get you to CT - Segment 16: Marshall Pass to Sargent's Mesa.

Ted Stroll

Electric Mountain Bikes Unknown

Features -none-


You reach Forest Road No. 578 via Forest Road No. 780, Forest Trail No. 488, and Milk Creek Trail No. 474.

After a mile or so, a climb of staggering difficulty begins. At least you know you're gaining elevation rapidly, as you hike-a-bike over a rockpile masquerading as a road. There are one or two places that are rideable, which gives one hope, but just as one has gotten into a rhythm, the ultra-steep, ultra-rocky aspect of this road reemerges. It doesn't let up until you reach Sawmill Park and encounter a much wider, smooth, and relatively level dirt road.

Ride this easy road south until you reach CT - Segment 16: Marshall Pass to Sargent's Mesa. Turn east and head gently downhill until you reach the junction with Tank Seven Creek Trail No. 480. You can then descend that trail or continue on the CT until you reach Marshall Pass.

I would never repeat this ride except at gunpoint, but am listing it (a) so people know what to expect and (b) in case people want to descend it. For riders with advanced technical skills, I'd guess most of it can be ridden downhill until you reach Milk Creek Trail No. 474. At that point, go west, find Trail No. 488 and Road 780, ending up in Sargents. Good luck!

Ancillary notes:
1. Some of this route shows as Forest Trail No. 625 on the generic 2014 Forest Service map, and all of it shows as Forest Road No. 578.2 on some editions of the National Geographic Trails Illustrated map No. 139 — La Garita–Cochetopa Hills.

2. The National Geographic Trails Illustrated map suggests you can also ride or drive up Marshall Pass to an intersection with this road along Milk Creek. However, as the map also shows, you'd then be riding through some off-limits private land on your way to the junction with Milk Creek Trail No. 474. So, avoid this approach unless you have permission from the landowner, a nearby ranch.

Biked this trail?

We need help with the following missing trail information:

Family Friendly, ADA Accessible, Need to Know, Features, Electic Mountain Bikes Allowed


Rate This Trail

Rate Quality

   Clear Rating

Rate Difficulty

Share This Trail

Check In



Stewarded By

Trail Ratings

  2.0 from 1 vote


  2.0 from 1 vote
5 Star
4 Star
3 Star
2 Star
1 Star
Trail Rankings


in Colorado


10 Views Last Month
218 Since Nov 3, 2016
Extremely Difficult



MTB Project is part of the REI Co-op family,
where a life outdoors is a life well lived.

Shop REI Mountain Bike

MTB Project is supported by

Support Your Local IMBA Chapter