San Luis Peak in the distance - Early June morning along Segment 20

Introduction
Segment 20 of the Colorado Trail is an interesting segment for a few different reasons. This segment of trail is shared with the Continental Divide Trail and also the Skyline Trail. So at different times throughout segment 20 you will see signs for both of these:

Segment 20 passes through the LaGarita Wilderness which is a truly remote gem of an area in Colorado. Another unique thing about this segment is that is passes very close to a Colorado 14er, San Luis Peak, which is Colorado's 50th highest ranked peak.

Trailhead Access
Start - Eddiesville TH 
The Eddiesville TH is a very remote TH in the LaGarita Wilderness of Colorado. While 4x4 is recommended, it is not typically required.
From Saguache, CO (see below for slightly different directions coming from Gunnison) - Drive west on HWY 114 for 35 miles until you reach a turnoff to the left for Rd 17GG. Drive on 17GG for 5.25 miles where it ends:

Turn right on NN14 and proceed 1.25 miles toward Upper Dome Reservoir and an intersection with 15GG. There is a sign here:

Turn south onto 15GG. It is 21 miles of more dirt road to the TH from this point. Continue for 4.2 miles where 15GG basically becomes 14DD. There is a gate and sign here:

This road is also called FS794 and many of the signs you see from here on out are small 794 signs. Continue another 3.9 miles on 14DD (794) and you will come across a sign on your right for the Historic Stage Route:

At 9.85 miles there is a Y in the road. Continue to follow 794 to the right. Another Y will greet you at 12 miles, stay left, again following 794. The rest of the road is easy to follow. At one point you will cross Nutras creek. After gaining some elevation the road will begin descending down to Stewart Creek. There are some nice campsites in this area along the road. You will see a turnoff for the Stewart Creek TH just before reaching the actual Eddiesville TH. There is camping at this TH and parking for probably 25 vehicles. There is no restroom and no services of any kind here, although water is plentiful. 

From Gunnison, CO - Drive east on HWY 50 for 8.1 miles from Main Street in Gunnison and turn south on HWY 114. Drive 19 miles to a turnoff to the right (south) for NN14. Continue on NN14 for 7 miles to Upper Dome Reservoir and an intersection with 15GG. Follow above for the remaining directions...

Trail Details
An important note about segment 20:
The Colorado Trail is marked using small markers affixed to trees and signposts etc. The continental Divide Trail is marked with 3-5 ft high posts. Along segment 20 you will be following Continental Divide trail signposts. The interesting thing about the posts and the trail is that there are almost no markers of any kind. When I finished mapping Segment 20 in in June of 2008 I only found 3 markers along the entire segment (and I hiked it both ways). One marker was on a gate and was actually a Colorado Trail Foundation sticker, 1 was at the highpoint and the other was at San Luis Pass. Here is a photo of me, at the highpoint, standing next to one of the many Continental Divide trail signposts you will see along this segment:

Segment 20 starts at the Eddiesville Trailhead (Waypoint 1). Leaving the TH, hike south down the road, crossing over Stewart Creek. Reach a trail register and some signage at .15 miles (Waypoint 2). Pass through a gate at .23 miles. From this point you will hike along a private fence for some time. Cross reliable water sources at .3 and .78 miles. Pass through a gate (Waypoint 6) at 1.15 miles. At 1.43 miles in you will come to a trail junction with the Machin Basin Trail. The Machin Basin trail heads off toward the creek to the east but is hardly visible. Pass a third gate at 3.5 miles. Waypoint 9 is a stream at 10,737 ft. While there is plenty of great camping along this segment, there is a really nice spot near mile 4.2 (see photo for Waypoint 10). Continue on, passing water at 4.6, 5.2, 6.0, 6.5, and 6.8 miles (Waypoint 15). Reaching Waypoint 15 you will have completed 1/2 of the elevation gain en route to the segment highpoint. More water is found at 7.1 miles. Reach the trail junction with the Stewart Creek Trail at 11,792 ft and 7.45 miles. Like the Machin Basin trail the trail marked here as the Stewart Creek Trail is not visible as it appears it is used very infrequently. At mile 9 you will get a good view of the remaining route up to the highpoint, a saddle between 14er San Luis Peak and unnamed pt 13,155. See photo of Waypoint 18 for a view of this route. Continue hiking up through the willows to the highpoint at 12,653ft where you are rewarded with awesome views. Continue to lose elevation now as you pass under the hoodoos below unnamed pt 13,155. Continue on the obvious trail reaching a lower saddle at 10.2 miles and 12,337ft. Continue losing elevation until you reach water at mile 11 along the forest near 12,000 ft. Begin climbing steeply up to another saddle at 12,389ft (Waypoint 24). You are now only .6 miles from San Luis Pass. Follow the obvious trail to San Luis Pass at 11,950 ft and 12.7 miles.