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Beaver Dam, Yellowstone National Park, Wyo., U.S.A., A

A BEAVER DAM, YELLOWSTONE PARK. One of the delightful exhibitions along the route between Mammoth Hot Springs and Norris Geyser Basin is the series of beaver dams which were built, many years ago, across a stream that flows along the base of the Obsidian Cliffs. The roadway runs directly along the margin of the series of ponds made by these dams--of which there are several, only a few rods apart, still stretching in zigzag form across the narrow valley. The water level in each pond, as one ascends the stream, is two or three feet higher than the level of the neighbor below. Here we have true terraced pools, as we have at the Hot Springs; but these are much larger, the waters are soft and cold, and the builders of these dams were living and intelligent agents instead of unconscious chemical and physical forces. The foreground of this view hsows the different levels quite clearly. A luxuriant, tough grass grows on the surface of these dams, and by its long, tough, interlacing roots helps to maintain their integrity. The builders of these remarkable structures were either killed or frightened away from publicity and danger several years ago; but the product of their intelligent industry and skill will doubtless remain intact for centuries.
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Photography,Stereoscopic,Yellowstone National Park,Wyoming
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