A Hidden Classic

We’re lucky to have Mount Baker as our namesake and main office. Complex, heavily glaciated, and wonderfully positioned in the North Cascades, Koma Kulshan stands at only 10,781 feet, yet radiates a BIG mountain impression. The mountain receives some of the largest snowfall totals in the world and hosts numerous classic ski mountaineering objectives. I’ve been exploring this topography for nearly four years and it continues to deliver amazing opportunities for adventure, such as skiing the Thunder Glacier.

The Thunder Glacier had been on my radar as a ski descent for several winters. It’s a striking line that’s often hidden while climbing the main routes. The Thunder Glacier is tucked between the jagged walls of Lincoln Peak and Heliotrope Ridge. Both flanks are characterized by crevasses and seracs, leaving a perfectly plumb fall line descent right down the middle. On March 15th 2020, as “normal” daily life was about to come to a screeching halt, we set off to snag what would be one of the last missions of our season.

Thunder Glacier

Glacier Creek Road Access

At 5:00 am the crew piled into my Tundra with snowmobiles in-toe. As we rolled out of Bellingham and down HWY 542, the excitement for the day started to build.I love these big days in the mountains. Forty-five minutes later, we found snowline on the Glacier Creek Road ◙. Five miles remained between us and the Heliotrop Trailhead ◙. Time to unload the sleds and figure out how to get six people up the road with two machines.

We had two options: we could shuttle and do two trips from truck to trailhead or we could double tow and get everyone up in one push. Shuttling would be easier on the snowmobiles and the legs; towing would save us an hour. I have a tendency to get a little over-stoked from time-to-time, especially when we have the opportunity to get the Baker Mountain Guides squad together on a rare sunny pow day. That and the fact that we were heading out for a big day made us decide to tow. A short 15 – 20-minute ride and we’d be on skis heading up the mountain. What could go wrong

Thunder Glacier

This was our first season with consistent access to snowmobiles, necessary toys to execute our new program: Twin Sisters Backcountry Skiing. In efforts to execute a smooth day of guiding on sleds, the past month was dedicated to, well, making mistakes. We learned how to get stuck, get unstuck, rig gear poorly, and rig gear properly. The devil is in the details and we still had a few lessons to learn.

The zone is popular amongst local snowmobilers and the road typically boasts a packed sled track. Packed roads require the use of scratchers. These little rods of metal scratch the firm snow, kicking up enough debris to keep the engine cool. Fueled by excitement, we overlooked these little buggers and took off before putting them down. Nearly halfway, both drivers smelled trouble, literally. The sleds were overheating. We stopped, packed the tracks with snow and waited roughly 20 minutes for things to cool down. The hot engine melted and warped one of the drive belts. With snowmobiles you just have to roll with the punches; they break, get stuck, overheat, it’s just the name of the game.

By 7:30 am we made it to the trailhead. Psyche levels were high.

Coleman Glacier Approach

We left the snowmobiles behind and started the 3000-foot ascent up Grouse Creek ◙ to gain Heliotrope Ridge ◙. The morning was cold and calm as we toured through the old-growth forest. At treeline, we got our first look at the upper mountain. We observed active wind transport off the ridgelines giving us some concern for the conditions to come. However, the protected slopes lower on the mountain harbored perfect cold smoke pow. We continued, knowing that no matter what happened, we’d enjoy some fantastic skiing.

Thunder Glacier

From the top of Heliotrope Ridge the views were amazing. To the south and west, we could see the Twin Sisters Range and the San Juan Islands. To the north, Canadian peaks littered the horizon. The Thunder Glacier was positioned directly in front of us with Mount Baker’s stoic presence looming in the background.

Thunder Glacier

The south wind was stronger than we expected. Fortunately, the jagged spires of Lincoln Peak ◙ provided some protection for the route. Ski mountaineering is a game of margins. The deck was stacked in our favor with an experienced team, clear skies above, and the option to spin at any time. After some deliberation, we decided to continue.

Thunder Glacier

We dropped onto the Football Field ◙, a distinct feature on the Coleman Glacier ◙. Here, we donned harnesses and crevasse rescue gear. Another 1000 feet of climbing brought us to the base of the impressive North Face of Colfax Peak ◙. From here the route takes a sharp right turn off the Coleman for the final push to the top of the Thunder Glacier.

Thunder Glacier

The winds were gusting up to 40 mph with sustained speeds in the 20’s as we crested over the saddle. When we peered down the other side things didn’t add up. We had over-shot the Thunder Glacier by a hundred feet and found ourselves looking out over the Deming Glacier ◙. A short five-minute downward traverse would lead us to the upper headwall of the Thunder Glacier and the proper start of the descent.

Thunder Glacier Ski Descent

12:30 pm. Standing on top of the route it was clear that we needed to avoid the Thunder Glacier’s upper headwall. Excited and nervous, we weighed our options. The snow conditions just weren’t right for terrain that steep. To maintain our margin for error, we skied down the ridge to a saddle 500 feet below. This allowed us to take advantage of a low angle entrance onto the Thunder Glacier.

The skiing on the ridge was pretty bad. Variable and wind affected snow made for an exciting start to the descent. There was still hope that we would find better conditions lower down where the snow was protected from the strongest winds. As soon as we dropped off the saddle and onto the Thunder Glacier, the snow conditions improved. Our smiles grew large in anticipation of the turns to come.

Thunder Glacier

We skied short pitches through some lower angle terrain, feeling out the conditions. As we approached a steeper and more broken section of the Thunder Glacier, a small, shallow wind slab popped on a steep convexity and ran down into a large crevasse. We set up for a long pitch of skiing through the crux of the route. We descended one at a time. It skied like a dream; beautiful boot-top pow down a 35-degree apron in a wild position. Like I said before, I love these big days in the mountains.

Thunder Glacier

Everyone relaxed a bit as we paused below the crux to catch our breath and take it all in. Finally, we continued down the remaining 1,400 vertical feet of nearly perfect, untouched powder only stopping to look back in disbelief at the stunning terrain. For the majority of the line, we were in the shadow of Lincoln Peak. Near the bottom, we popped out into the sun and stopped for a much-needed break to refuel. Looking back at the Thunder Glacier we noticed that almost all of our tracks were gone. The wind quickly reset the landscape and it was as if we were never there. The impermanence of it all – the tracks, our presence – it was perfect.

Before long it was time to pack up and start our final climb of the day. The descent drops you into another basin, leaving a mean 1,200-foot climb back to the top of Grouse Creek. Despite the wind and fatigue, the team made quick work of the climb, fueled by accomplishment. Soon enough, we were transitioning for another 3,000 feet of powder back to the snowmobiles.

Thunder Glacier

Thunder Glacier Route Profile:

  • Total Distance – 8.5 Miles
  • Trailhead Elevation – 3650 feet
  • Top of Route – 8570 feet
  • Elevation Gain – 6100 feet
  • Thunder Glacier Descent – 3070 feet

Thunder Glacier Thunder Glacier