The pass is in a nearly level grassy park hemmed in by the surrounding hills, and is 8,150 feet above the level of the sea. Its extreme length is about one mile and its extreme breadth about three-fourths of a mile. From the north a stream issues from a cañon, a, and divides at b, part flowing to Atlantic Creek and part to Pacific Creek. A similar stream, c, with a similar division, d, comes from the south. At extreme low water, these divisions may possibly disappear and all the water flow either one way or the other. But at ordinary and high stages the water flows both ways. These streams are by no means insignificant rivulets, but substantial water-courses capable of affording passage to fish of considerable size.
Here, then, we have the very interesting phenomenon of a single stream upon the summit of the continent dividing and flowing part one way and part the other, and forming a continuous water connection between the Atlantic and Pacific Oceans over a distance of nearly 6,000 miles.
A most singular and interesting acoustic phenomenon of this region, although rarely noticed by tourists, is the occurrence of strange and indefinable overhead sounds. They have long been noted by explorers, but only in the vicinity of Shoshone and Yellowstone Lakes. They seem to occur in the morning, and to last only for a moment. They have an apparent motion through the air, the general direction noted by writers being from north to south. The following descriptions are from the pens of those who have given some study to these strange sounds. Prof. S. A. Forbes says:
"It put me in mind of the vibrating clang of a harp lightly and rapidly touched high up above the tree tops, or the sound of many telegraph wires swinging regularly and rapidly in the wind, or, more rarely, of faintly heard voices answering each other overhead. It begins softly in the remote distance, draws rapidly near with louder and louder throbs of sound, and dies away in the opposite direction; or it may seem to wander irregularly about, the whole passage lasting from a few seconds to half a minute or more." [BJ]
[BJ] “Overhead sounds in the vicinity of Yellowstone Lake.” See [Appendix E].
Mr. Edwin Linton thus describes it:
“It seemed to begin at a distance, grow louder overhead where it filled the upper air, and suggested a medley of wind in the tops of pine trees, and in telegraph wires, the echo of bells after being repeated several times, the humming of a swarm of bees, and two or three other less definite sources of sound, making in all a composite which was not loud, but easily recognized, and not at all likely to be mistaken for any other sound in these mountain solitudes.” [BK]
[BK] “Overhead sounds in the vicinity of Yellowstone Lake.” See [Appendix E].
No rational explanation has ever been advanced for this remarkable phenomenon. Its weird character is in keeping with its strange surroundings. In other lands and times it would have been an object of superstitious reverence or dread, and would have found a permanent place in the traditions of the people.