Thielsen from the Highway Thielsen across Diamond Lake Thielsen through the Trees Climbing towards the SW Face Bailey across Diamond Lake View of Crater Lake Thielsen Summit Ridge Thielsen Summit Spire Starting the Descent Snowboarding Down the Face Skiing Below Lava Spires Skiing a Steep Chute Southwest Face of Thielsen Descending through the Trees Map of Thielsen Ski Route

We followed the snow upward, eventually climbing a steep chute along the left edge of the southwest face to 8600 ft. Here the snow ran out and the steep scree and talus began. We took a rest break before heading towards the summit. This view looks southwest towards Crater Lake (Mount Scott at left, the peaks at center and right are high points on the rim, the lake itself is not visible). The treeless white plain at right is the snow-covered Pumice Desert, a result of the deep ashfall from Mount Mazama's cataclysmic eruption 6900 years ago.