“He therefore pursued the southwest course of the river, which was one constant succession of rapids and small cascades, at every one of which the bluffs grew lower, or the bed of the river became more on a level with the plains. At the distance of two and one-half miles he arrived at another cataract, of twenty-six feet. The river is here six hundred yards wide, but the descent is not immediately perpendicular, though the river falls generally with a regular and smooth sheet; for about one-third of the descent a rock protrudes to a small distance, receives the water in its passage, and gives it a curve. On the south side is a beautiful plain, a few feet above the level of the falls; on the north, the country is more broken, and there is a hill not far from the river. Just below the falls is a little island in the middle of the river, well covered with timber. Here on a cottonwood tree an eagle had fixed her nest, and seemed the undisputed mistress of a spot, to contest whose dominion neither man nor beast would venture across the gulfs that surround it, and which is further secured by the mist rising from the falls. This solitary bird could not escape the observation of the Indians, who made the eagle’s nest a part of their description of the falls, which now proves to be correct in almost every particular, except that they did not do justice to the height. “Just above this is a cascade of about five feet, beyond which, as far as could be discerned, the velocity of the water seemed to abate. Captain Lewis now ascended the hill which was behind him, and saw from its top a delightful plain, extending from the river to the base of the Snowy (Rocky) Mountains to the south and southwest. Along this wide, level country the Missouri pursued its winding course, filled with water to its smooth, grassy banks, while about four miles above, it was joined by a large river flowing from the northwest, through a valley three miles in width, and distinguished by the timber which adorned its shores. The Missouri itself stretches to the south, in one unruffled stream of water, as if unconscious of the roughness it must soon encounter, and bearing on its bosom vast flocks of geese, while numerous herds of buffalo are feeding on the plains which surround it.