There are several routes possible for exploring the ridge between Boulder Creek and Whistler Creek, which I call “Whistler Ridge”. The rocky high elevations are guarded by extremely dense brush down low, most of which can be bypassed by hiking a couple miles up Boulder Creek or following a hard-to-find trail that ends a little too soon and leaves some routefinding work to do. There are really two main ridges, a north ridge bordering Boulder Creek that is fairly simple to follow despite how craggy it appears, and a south ridge bordering Whistler Creek that features many prominent rock spires. Exploring the south ridge requires some difficult scrambling and eventually results in a dead end at some impassable rock spires, but the spires make for interesting photographs and it’s possible to follow an easier (but not easy) route back down to Whistler Creek, which is very colorful and scenic. The north ridge joins with the south ridge above the rock spires and if you follow the north ridge you can continue to a high point along the ridge at 5800 feet which features great views, and from there you can continue to explore the upper reaches of the Whistler Creek basin which includes some interesting cliffs and a small cirque glacier.
Route Length (south ridge): 2 miles (one-way); 2000 feet elevation gain; very difficult, experienced hikers only
Route Length (north ridge): up to 4 miles (one-way); 3500 feet elevation gain