Running the Logging Roads and West Ridge of North Twin Sister

Page Type
Trip Report
North America
Date Climbed/Hiked:
Oct 2, 2006
Hiking, Mountaineering
5798 Hits
72.08% Score
Log in
to vote
Page By:
Running the Logging Roads and West Ridge of North Twin Sister
Created On: Dec 8, 2008
Last Edited On: Sep 14, 2013

Training for the Seattle Marathon....

In October 2006, I was training for the Seattle Half-Marathon, so I decided to go on a long run . But when I woke up Saturday morning and saw that it wasn't raining yet, I wanted to climb. So, I decided to do both! The approach to the west ridge of the North Twin Sister is 6+ miles of logging roads one way (most people bring a bike, I brought running shoes), and along with the climb, this was a great training day! A 13 mile run punctuated by a couple of thousand feet of Class 3/4 scrambling to keep it interesting. Time: 2.5 hours from car to summit, 2.25 hours from summit to car

My brief laptop mountaineering of the North Twin indicated that several climbers have had trouble staying on the correct logging roads on the approach. So in the below trip report I have included some detailed directions (read if you want). I have also included some of my photos from the climb. Enjoy!



I have attached a map (Beckey's guide, pg 40) below that shows some of the roads, as well as the trail network. Basically, you need to get on Mosquito Lake Road, either from Acme or Welcome, WA. Just north of where Mosquito Lake road crosses the Middle Fork of the Nooksack River (about 6 miles from Welcome, 10 miles from Acme), a well-graded dirt road (Road 38) branches off to the west. Take this road. At about 4.5 miles you will come to a bridge over Clearwater Creek. Shortly after this, take the right fork down to the river (Road 38 forks left). There is a gate just before the bridge over the river. This gate is usually closed, so park here and begin the hike (or bike) up the logging roads.

Click on the map for a bigger view. I have outlined the route from the gate to the summit, and added some notes to help with route finding.

The Trail/Road network

Note #1: Unless you prefer hiking or you plan to run the logging roads, I would suggest bringing a bike to ride down. The roads are well-graded and would be lots of fun (and much faster) to bike down!

Note #2: The following route description was updated in 2010 when a friend pointed out some minor changes in the logging road approach since  I did the route in 2006. As is typical in the mountains, route details are always liable to change, so take this info with a grain of salt that grows larger with each passing year.

The map above shows the route outlined in red. I have added some comments to the map to point out some notable landmarks. Here is a brief description of the route from the gate:

  • Cross the bridge and hike/run/bike/push bike up a well-graded logging road.
  • After 2.6 miles (took me 30 minutes jogging), the road forks. Take the right fork. Don't be tempted to continue along the main logging road (marked by a sign, "9070”), since this goes to a quarry.
  • This logging road, the right fork, climbs gradually through a recent large clearcut. About half a mile after crossing a stream on a sturdy bridge, the road forks. Take the left fork.
  • Not long after the fork, there is a bushy road (behind a dirt mound) turning off to the left, but continue on the main road. (In general, if you see bike tracks you are on the right road.)
  • About 0.35 miles after the bushy road you don't want to take, just past where the road starts downhill, look for a trail that turns off the road to the left (see photo below). There is a dirt mound, dead tree, and cairn. Only climbers make cairns, so this must be the trail you want! It is about 6.5 miles from the car. It took me 1 hour jogging to get to here from the car.
  • The trail is narrow for a little bit, but then widens to an old road spur and switchbacks through a clearcut.
  • Where the road spur comes to an end (this is where I would stash a bike), head leftwards past a fire ring and find the trail leading through brushy clearcut to the timbered ridge. Where the trees end (1.5 hours from the car for me), just follow the ridge all the way to the top. Don’t worry about following a trail or route description here, just go wherever your arms and legs lead you. Happy scrambling!
  • For the descent, I just descended the ridge and got back on the trail. In the earlier season, there is enough snow on the north side that I've heard that you can glissade back down to the trail if you don't mind steep snow.

Photos from the climb

The route up the West Ridge as seen from the clearcut area.

Looking up towards the obelisk on the West Ridge, about halfway up the climb. The Twin Sisters are actually the largest body of exposed olivine in the Western Hemisphere. The rock is called dunite, and it is super grippy and is some of the best climbing rock in the North Cascades (Beckey, pg 41).

The view west down the west ridge. The climb gives a great view of the San Juan and Gulf Islands.

The South Twin Sister and the North Cascades from the summit of the North Twin. I got to the summit in 2.5 hours from the car.

Looking down the North side of the North Twin from the summit. In the earlier season, some people descend by glissading down the north side of the mountain (although others have said it is too steep to do so - as I tend to prefer rock to snow, I might side with this opinion depending on the snow's condition), but without the snow cover it looked too loose to be much fun, so I just descended back down the ridge (1 hour from summit to treeline for me, 1 h 15 minutes more to my car (now I wished I had a bike to bomb down the roads!)).

More on my website

This trip report is copied from my website, which has several other climbing trip reports and photographs from the North Cascades and elsewhere:


Post a Comment
Viewing: 1-3 of 3
vancouver islander

vancouver islander - Dec 9, 2008 12:14 pm - Voted 10/10

Nice report

You may want to amend the "glissade" down the north face statement a bit. It's bloody steep and a glissade right off the top might be distastrous.

5 Hours return! What it is to be young...........

I'm wading through all the reports that you inundated us with last night, naturally reading those I've done first - that shouldn't take long :) What a huge volume of work and great to have it on SP.

Thanks once more.




StephAbegg - Dec 9, 2008 12:51 pm - Hasn't voted

Re: Nice report

I amended the glissade part. I was going on information from a friend who had climbed the route in June, and apparently they found it to be an easy glissade then. It likely depends a lot on the condition of the snow: too hard and icy or too loose and sluffy and it probably wouldn't be a good descent.

Enjoy the reports. I am in the process of transfering over my reports from my own website. As I've found summitpost to be a useful reference tool for planning my own climbs, I thought it might be a better way to share my experiences and route information with others.

vancouver islander

vancouver islander - Dec 9, 2008 1:23 pm - Voted 10/10

Re: Nice report

We did it in early June. Very hard and icy at the top. Faced in for the first 50 metres, out for the next 50-100 and then bum-slid the rest.

Viewing: 1-3 of 3

Running the Logging Roads and West Ridge of North Twin Sister

Trip Report
2 Images 3 Comments


North TwinTrip Reports