A writer from the Century Illustrated Monthly Magazine toured the falls of the Missouri in the autumn of 1887 and reported: “The appearance of the Black Eagle Fall suggests its future use. Some day it will drive saws, spindles, and mill-stones.”4 Indeed, plans for harnessing the fall’s potential were already under way. The first dam, completed in 1891, provided both direct mechanical power and a limited amount of electricity for local use.
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Meriwether Lewis was known to comment on the falls:
. . . hearing a tremendious roaring above me I continued. . . a few hundred yards further and was again presented by one of the most bea[utiful]objects in nature, a cascade of about fifty feet perpendicular stre[t]ching at [right angles] across the river from side to side to the distance of at least a quarter of a mile. here the river pitches over a shelving rock, with an edge as regular and streight as if formed by art, without a nich[e] or br[eak] in it; the water descends in one even and uninterrupted sheet . . .
The waterfall was named “Beautiful Cascade” and later “Handsom[e] Falls” by Lewis, but was given its present name by Thomas B. Roberts, a railroad engineer, in 1872. — From Wikipedia
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Grand Prismatic Spring was noted by geologists working in the Hayden Geological Survey of 1871, and named by them for its striking coloration. Its colors match the rainbow dispersion of white light by an optical prism: red, orange, yellow, green, and blue. — From Wikipedia.
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