CDT Alpine Tunnel

 10 votes

18.0 Miles 28.9 Kilometers


40%

Singletrack

2,427' 740 m

Ascent

-2,443' -745 m

Descent

12,295' 3,747 m

High

9,980' 3,042 m

Low

5%

Avg Grade (3°)

20%

Max Grade (11°)

Minor Issues

20 hours agoUpdate

Historic high alpine riding.

Adam Kagy

Overview

This ride has it all. A historic ghost town, railroad history, primitive high alpine singletrack and a fantastic descent.

The traffic on this trail is surprisingly low given the uniqueness of the singletrack and history surrounding the area. Go during the fall to get a special experience of fall color in the aspens and alpine tundra.

Need to Know

Since much of this trail traverse high alpine tundra at 12k feet, it usually won't be snow free until sometime in June or even July. Consequently it will also be under snow much earlier than most rides as well.

Description

This ride starts in the historic ghost town of St. Elmo. Ride Southeast on Forest Service Road 295. This is the old historic Denver/South Park railroad grade. Since it's a railroad grade, the climb is gradual and easy. After around 6 miles, you'll pass by the old townsite of Hancock. Look for a bridge and cross it.

From here, look for the Alpine Tunnel trail sign. You'll now be on the Tunnel Lake Trail singletrack. Ride east for about 2 miles then look for a trail sign for the Continental Divide Trail to your left and take this trail. The next 1/2 climbs steeply up to the saddle where you'll come to another signed trail junction. Take a ride to stay on the CDT.

If you feel like you have the energy and time, you can stay straight on this trail (Alpine Tunnel Connector) which will drop down around 400ft and 3/4 mile off the saddle down to the west portal of the Alpine Tunnel. This short out and back is well worth the effort as there is an old restored rail station with multiple photographs and artifacts available to view inside. It also makes for a nice lunch spot and a shelter from the wind.

While on the CDT enjoy the primitive singletrack and amazing views all around. The first 1.5 mi climbs up to a saddle steeply at times. Soak in the view of Tunnel Lake to your ride and enjoy this unique piece of singletrack that can be overgrown and grassy at times. Once the climb up the saddle is finished you'll have a fairly technical, fun and rocky descent. After the quick descent is done you'll have 1 more fairly short and quick climb before the trail flattens and rolls along the alpine tundra.

The next part of the trail is the reward. The descent starts out with a few drainage step downs and above tree line rolling tundra. After a short while you'll enter the trees and the trail will become very smooth, flowy and fast. Be careful with speed here as the switchbacks come up quickly and turns are sometimes sharp. Near the end you'll cross a wooden bridge over a stream and eventually end up at a dirt road (FS 267). Take a right here and follow it back to St. Elmo and your car.

History & Background

http://en.wikipedia.org/wiki/Alpine_Tunnel

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   Clear

4.7 from 10 votes


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Your Check-Ins

Check-Ins

Aug 21, 2017
Matt Parker
Cut out one of the three trees crossing the trail. Other two are too big for a hand saw.
Aug 17, 2017
Peter Ericson
Jul 22, 2017
Nicole McHenry
2 snow patches on 7/22 18mi
Jul 9, 2017
Aaron D
Jul 5, 2017
Rachel Friedman
Jun 25, 2017
brian firestone
Aug 26, 2016
Rebekah Giaraffa
Perfect conditions. Hero dirt down the switchbacks.
Jul 29, 2016
Ke Va
Clear and dry the whole way 18mi

Trail Ratings

  4.7 from 10 votes

#1

in St. Elmo

#432

Overall
  4.7 from 10 votes
5 Star
80%
4 Star
10%
3 Star
10%
2 Star
0%
1 Star
0%
Rankings

#1

in St. Elmo

#112

in Colorado

#432

Overall
809 Views Last Month
6,329 Since Sep 19, 2014
Intermediate/Difficult Intermediate/Difficult

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Conditions


Minor Issues 20 hours ago
Fallen Trees: Was able to cut one tree out of the trail, but still two big ones left to climb over or ride around.
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