Post 23529
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Down in the main cañons of the middle region broad masses are launched over the brows of cliffs three or four thousand feet high, which, worn to dust by friction in falling so far through the air, oftentimes hang for a minute or two in front of the tremendous precipices like gauzy half-transparent veils, gloriously beautiful when the sun is shining through them. Most of the cañon avalanches, however, flow in regular channels, like the cascades of tributary streams. When the snow first gives way on the upper slopes of their basins a dull muffled rush and rumble is heard, which, increasing with heavy deliberation, seems to draw rapidly nearer with appalling intensity of tone. Presently the wild floods comes in sight, bounding out over bosses and sheer places, leaping from bench to bench, spreading and narrowing and throwing off clouds of whirling diamond dust like a majestic foamy cataract. Compared with cascades and falls, avalanches are short-lived, and the sharp clashing sounds so common in dashing water are usually wanting; but in their deep thunder tones and pearly purple-tinged whiteness, and in dress, gait, gestures, and general behavior, they are much alike.
Besides these common storm avalanches there are two other kinds, the annual and the century, which still further enrich the scenery, though their influence on fountains is comparatively small. Annual avalanches are composed of heavy compacted snow which has been subjected to frequent alternations of frost and thaw. They are developed on cañon and mountain sides, the greater number of them, at elevations of from nine to ten thousand feet, where the slopes are so inclined that the dry snows of winter accumulate and hold fast until the spring thaws sap their foundations and make them slippery. Then away in grand style go the ponderous icy masses, adorned with crystalline spray without any cloudy snow dust; some of the largest descending more than a mile with even, sustained energy and directness like thunderbolts. The grand century avalanches, that mow wide swaths through the upper forests, occur on shady mountain sides about ten to twelve thousand feet high, where, under ordinary conditions, the snow accumulated from winter to winter lies at rest for many years, allowing trees fifty to a hundred feet high to grow undisturbed on the slopes below them. On their way through the forests they usually make a clean sweep, stripping off the soil as well as the trees, clearing paths two or three hundred yards wide from the timber line to the glacier meadows, and piling the uprooted trees, head downward, in windrows along the sides like lateral moraines. Sears and broken branches on the standing trees bordering the gaps record the side depth of the overwhelming flood; and when we come to count the annual wood rings of the uprooted trees, we learn that some of these colossal avalanches occur only once in about a century, or even at still wider intervals.
Few mountaineers go far enough, during the snowy months, to see many avalanches, and fewer still know the thrilling exhilaration of riding on them. In all my wild mountaineering I have enjoyed only one avalanche ride; and the start was so sudden, and the end came so soon, I thought but little of the danger that goes with this sort of travel, though one thinks fast at such times. One calm, bright morning in Yosemite, after a hearty storm had given three or four feet of fresh snow to the mountains, being eager to see as many avalanches as possible, and gain wide views of the peaks and forests arrayed in their new robes, before the sunshine had time to change or rearrange them, I set out early to climb by a side cañon to the top of a commanding ridge a little over three thousand feet above the valley. On account of the looseness of the snow that blocked the cañon I knew the climb would be trying, and estimated it might require three or four hours. But it proved far more difficult than I had foreseen. Most of the way I sank waist-deep, in some places almost out of sight; and after spending the day to within half an hour of sundown in this loose, baffling snow work, I was still several hundred feet below the summit. Then my hopes were reduced to getting up in time for the sunset, and a quick, sparkling home-going beneath the stars. But I was not to get top views of any sort that day; for deep trampling near the cañon head; where the snow was strained, started an avalanche, and I was swished back down to the foot of the cañon as if by enchantment. The plodding, wallowing ascent of about a mile had taken all day, the undoing descent perhaps a minute.