John Muir: Wilderness Essays, Environmental Studies, Memoirs & Letters (Illustrated Edition). John Muir
never been greater than at present.
A rough approximation to the average duration of these mountain lakes may be made from data already suggested, but I cannot stop here to present the subject in detail. I must also forego, in the mean time, the pleasure of a full discussion of the interestingquestion of lake-basin formation, for which fine, clear, demonstrative material abounds in these mountains. In addition to what has been already given on the subject, I will only make this one statement. Every lake in the Sierra is a glacier lake. Their basins were not merely remodeled and scoured out by this mighty agent, but in the first place were eroded from the solid.
I must now make haste to give some nearer views of representative specimens lying at different elevations on the main lake-belt, confining myself to descriptions of the features most characteristic of each.
THIS is a fine specimen of the oldest and lowest of the existing lakes. It lies about eight miles above Yosemite Valley, on the main branch of the Merced, at an elevation of about 7350 feet above the sea; and is everywhere so securely cliff-bound that without artificial trails only wild animals can get down to its rocky shores from any direction. Its original length was about a mile and a half; now it is only half a mile in length by about a fourth of a mile in width, and over the lowest portion of the basin ninety-eight feet deep. Its crystal waters are clasped around on the north andsouth by majestic granite walls sculptured in true Yosemitic style into domes, gables, and battlemented headlands, which on the south come plunging down sheer into deep water, from a height of from 1500 to 2000 feet. The South Lyell glacier eroded this magnificent basin out of solid porphyritic granite while forcing its way westward from the summit fountains toward Yosemite, and the exposed rocks around the shores, and the projecting bosses of the walls, ground and burnished beneath the vast ice-flood, still glow with silvery radiance, notwithstanding the innumerable corroding storms that have fallen upon them. The general conformation of the basin, as well as the moraines laid along the top of the walls, and the grooves and scratches on the bottom and sides, indicate in the most unmistakable manner the direction pursued by this mighty ice-river, its great depth, and the tremendous energy it exerted in thrusting itself into and out of the basin; bearing down with superior pressure upon this portion of its channel, because of the greater declivity, consequently eroding it deeper than the other portions about it, and producing the lake-bowl as the necessary result.
With these magnificent ice-characters so vividly before us it is not easy to realize that the old glacier that made them vanished tens of centuries ago; for, excepting the vegetation that has sprung up, and the changes effected by an earthquake that hurled rock-avalanches from the weaker headlands, the basin as a whole presents the same appearance that it did when first brought to light. The lake itself, however, has undergone marked changes; one sees at a glance that it is growing old. More than two thirds of its original area is now dry land, covered with meadow-grasses and groves of pine and fir, and the level bed of alluvium stretching across from wall to wall at the head is evidently growing out all along its lakeward margin, and will at length close the lake forever.
Every lover of fine wildness would delight to saunter on a summer day through the flowery groves now occupying the filled-up portion of the basin. The curving shore is clearly traced by a ribbon of white sand upon which the ripples play; then comes a belt of broad-leafed sedges, interrupted here and there by impenetrable tangles of willows; beyond this there are groves of trembling aspen; then a dark, shadowy belt of Two-leaved Pine, with here and there a round carex meadow ensconced nest-like in its midst; and lastly, a narrow outer margin of majestic Silver Fir 200 feet high. The ground beneath the trees is covered with a luxuriant crop of grasses, chiefly triticum, bromus, and calamagrostis, with purple spikes and panicles arching to one's shoulders; while the open meadow patches glow throughout the summer with showy flowers,--heleniums, goldenrods, erigerons, lupines, castilleias, and lilies, and form favorite hiding-and feeding-grounds for bears and deer.
The rugged south wall is feathered darkly along the top with an imposing array of spirey Silver Firs, while the rifted precipices all the way down to the water's edge are adorned with picturesque old junipers, their cinnamon-colored bark showing finely upon the neutral gray of the granite. These, with a few venturesome Dwarf Pines and Spruces, lean out over fissured ribs and tablets, or stand erect back in shadowy niches, in an indescribably wild and fearless manner. Moreover, the white-flowered Douglas spiræa and dwarf evergreen oak form graceful fringes along the narrower seams, wherever the slightest hold can be effected. Rock-ferns, too, are here, such as allosorus, pellæa, and cheilanthes, making handsome rosettes on the drier fissures; and the delicate maidenhair, cistoperis, and woodsia hide back in mossy grottoes, moistened by some trickling rill; and then the orange wall-flower holds up its showy panicles here and there in the sunshine, and bahia makes bosses of gold. But, notwithstanding all this plant beauty, the general impression in looking across the lake is of stern, unflinching rockiness; the ferns and flowers are scarcely seen, and not one fiftieth of the whole surface is screened with plant life.
The sunnier north wall is more varied in sculpture, but the general tone is the same. A few headlands, flat-topped and soil-covered, support clumps of cedar and pine; and up-curving tangles of chinquapin and live-oak, growing on rough earthquake taluses, girdle their bases. Small streams come cascading down between them, their foaming margins brightened with gay primulas, gilias, and mimuluses. And close along the shore on this side there is a strip of rocky meadow enameled with buttercups, daisies, and white violets, and the purple-topped grasses out on its beveled border dip their leaves into the water.
The lower edge of the basin is a dam-like swell of solid granite, heavily abraded by the old glacier, but scarce at all cut into as yet by the outflowing stream, though it has flowed on unceasingly since the lake came into existence.
As soon as the stream is fairly over the lake-lip it breaks into cascades, never for a moment halting, and scarce abating one jot of its glad energy, until it reaches the next filled-up basin, a mile below. Then swirling and curving drowsily through meadow and grove, it breaks forth anew into gray rapids and falls, leaping and gliding in glorious exuberance of wild bound and dance down into another and yet another filled-up lake basin. Then, after a long rest in the levels of Little Yosemite, it makes its grandest display in the famous Nevada Fall. Out of the clouds of spray at the foot of the fall the battered, roaring river gropes its way, makes another mile of cascades and rapids, rests a moment in Emerald Pool, then plunges over the grand cliff of the Vernal Fall, and goes thundering and chafing down a boulder-choked gorge of tremendous depth and wildness into the tranquil reaches of the old Yosemite lake basin.
The color-beauty about Shadow Lake during the Indian summer is much richer than one could hope to find in so young and so glacial a wilderness. Almost every leaf is tinted then, and the goldenrods are in bloom; but most of the color is given by the ripe grasses, willows, and aspens. At the foot of the lake you stand in a trembling aspen grove, every leaf painted like a butterfly, and away to right and left round the shores sweeps a curving ribbon of meadow, red and brown dotted with pale yellow, shading off here and there into hazy purple. The walls, too, are dashed with bits of bright color that gleam out on the neutral granite gray. But neither the walls, nor the margin meadow, nor yet the gay, fluttering grove in which you stand, nor the lake itself, flashing with spangles, can long hold your attention; for at the head of the lake there is a gorgeous mass of orange-yellow, belonging to the main aspen belt of the basin, which seems the very fountain whence all the color below it had flowed, and here your eye is filled and fixed. This glorious mass is about thirty feet high, and extends across the basin nearly from wall to wall. Rich bosses of willow flame in front of it, and from the base of these the brown meadow comes forward to the water's edge, the whole being relieved against the unyielding green of the coniferæ, while thick sun-gold is poured over all.
During these blessed color-days no cloud darkens the sky, the winds are gentle, and the landscape rests, hushed everywhere, and indescribably impressive. A few ducks are usually seen sailing on the lake, apparently more for pleasure than anything else, and the ouzels at the head of the rapids sing always; while robins, grosbeaks, and the Douglas squirrels are busy in the groves, making delightful company, and intensifying the feeling of grateful sequestration without ruffling the deep, hushed calm and peace.
This autumnal mellowness usually lasts until the end of November. Then come days of quite another kind. The winter