No sketch of the canyon is complete without the story of the great robbery. I am not referring to the several hold-ups of the old stage-coach days, but to a robbery which occurred long before the coming of man—the theft of the waters of Yellowstone Lake; for this splendid river, these noble falls, this incomparable canyon, are the ill-gotten products of the first of Yellowstone's hold-ups.
Originally Yellowstone Lake was a hundred and sixty feet higher and very much larger than it is to-day. It extended from the headwaters of the present Yellowstone River, far in the south, northward past the present Great Fall and Inspiration Point. It included a large part of what is now known as the Hayden Valley. At that time the Continental Divide, which now cuts the southwest corner of the park, encircled the lake on its north, and just across the low divide was a small flat-lying stream which drained and still drains the volcanic slopes leading down from Dunraven Peak and Mount Washburn.
This small stream, known as Sulphur Creek, has the honor, or the dishonor if you choose, of being the first desperado of the Yellowstone, but one so much greater than its two petty imitators of human times that there is no comparison of misdeeds. Sulphur Creek stole the lake from the Snake River and used it to create the Yellowstone River, which in turn created the wonderful canyon. Here at last is a crime in which all will agree that the end justified the means.
How this piracy was accomplished is written on the rocks; even the former lake outlet into the Snake River is plainly discernible to-day. At the lake's north end, where the seeping waters of Sulphur Creek and the edge of the lake nearly met on opposite sides of what was then the low flat divide, it only required some slight disturbance indirectly volcanic, some unaccustomed rising of lake levels, perhaps merely some special stress of flood or storm to make the connection. Perhaps the creek itself, sapping back in the soft lava soils, unaided found the lake. Connection once made, the mighty body of lake water speedily deepened a channel northward and Sulphur Creek became sure of its posterity.
At that time, hidden under the lake's surface, two rhyolite dikes, or upright walls of harder rock, extended crosswise through the lake more than half a mile apart. As the lake-level fell, the nearer of these dikes emerged and divided the waters into two lakes, the upper of which emptied over the dike into the lower. This was the beginning of the Great Fall. And presently, as the Great Fall cut its breach deeper and deeper into the restraining dike, it lowered the upper-lake level until presently the other rhyolite dike emerged from the surface carrying another cataract. And thus began the Upper Fall.
Meantime the stream below kept digging deeper the canyon of Sulphur Creek, and there came a time when the lower lake drained wholly away. In its place was left a bottom-land which is now a part of the Hayden Valley, and, running through it, a river. Forthwith this river began scooping, from the Great Fall to Inspiration Point, the scenic ditch which is world-celebrated to-day as the Grand Canyon of the Yellowstone.
IV
Now imagine this whole superlative wilderness heavily populated with wild animals in a state of normal living. Imagine thirty thousand elk, for instance, roaming about in bands of half a dozen to half a thousand. Imagine them not friendly, perhaps, but fearless, with that entire indifference which most animals show to creatures which neither help nor harm them—as indifferent, say, as the rabbits in your pasture or the squirrels in your oak woods. Imagine all the wild animals, except the sneaking, predatory kind, proportionally plentiful and similarly fearless—bear, antelope, mountain-sheep, deer, bison, even moose in the fastnesses, to say nothing of the innumerable smaller beasts. There has been no hunting of harmless animals in the Yellowstone since 1894, and this is one result.
It is true that comparatively few visitors see many animals, but that is the fault of their haste or their temperament or their inexperience of nature. One must seek in sympathy to find. Tearing over the wilderness roads in noisy motors smelling of gasolene is not the best way to find them, although the elk and deer became indifferent to automobiles as soon as they discovered them harmless. One may see them not infrequently from automobiles and often from horse-drawn wagons; and one may see them often and intimately who walks or rides horseback on the trails.
The admission of the automobile to Yellowstone roads changed seeing conditions materially. In five days of quiet driving in 1914 with Colonel L.M. Brett, then superintendent of the park, in a direction opposite to the stages, I saw more animals from my wagon-seat than I had expected to see wild in all my life. We saw bear half a dozen times, elk in numbers, black-tailed and white-tailed deer so frequently that count was lost the second morning, four bands of antelope, buffalo, foxes, coyotes, and even a bull moose. Once we stopped so as not to hurry a large bear and two cubs which were leisurely crossing the road. Deer watched us pass within a hundred yards. Elk grazed at close quarters, and our one bull moose obligingly ambled ahead of us along the road. There was never fear, never excitement (except my own), not even haste. Even the accustomed horses no more than cocked an ear or two while waiting for three wild bears to get out of the middle of the road.