Sperry Glacier
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[edit] Geology
Although many geologic features of Glacier National Park were formed during the much longer period of glaciation ending over 10,000 years ago, Sperry Glacier, like all the glaciers in the park today, is a product of the recent "Little Ice Age," the period of cooler average temperatures starting in about the 13th century and concluding in the mid-19th century.
Like many other glaciers in the park, Sperry has significantly retreated, though it leaves many minor glacial features, including large morraines and streams and lakes colored a milky aqua from glacial flour. Unlike the more famous Grinnell Glacier, Sperry is high above the lakes it feeds, so no icebergs form.
[edit] Visiting the Glacier
Hikers may wish to spend the night at Sperry Chalet or its neighboring backcountry campground (requires a permit) before the hike to Sperry Glacier. Although it is seven miles round-trip from the Chalet (about eight from the campground), it is a steep walk, rising 1600 feet in just 2.5 miles. Invisible from the rocky slopes below, a series of green glacial cirques with trickling streams and waterfalls and clear lakes reflecting snow fields and mountain peaks leads to a steep and narrow stone staircase cut into the stone ridge of Comeau Pass. The view from the top of the steps is panoramic, encompassing Mt. Brown, Edwards Mountain, and Little Matterhorn.
Reaching the glacier itself involves crossing a wide rock scrabble, snow fields, and the colorful but sometimes tricky glacial morraine. Following the rock cairns and other trail markers will ensure the best footing and easiest routes. Ranger-led hikes are available, starting at the chalet.
[edit] Wildlife
Early morning visitors can expect to see chipmunks, ground squirrels, hoary marmots and mountain goats along the trail to Comeau Pass. Mountain goats can sometimes be found above the pass.
