The Kepler Cascades were described by the Washburn-Langford-Doane Expedition in 1870 but not named until 1881.
In his 1871 report to the Secretary of War, Gustavus C. Doane, a member of the expedition described Kepler Cascades as:
September 18 [1870]. --
We broke camp at 9 o'clock, traveling along the slopes of the ridges, skirting the ravines through falling timber, and passing in many places over swampy terraces, for a distance of three miles, when we suddenly came upon a mountain torrent, 40 feet wide, and running through a gorge of trachyte lava 200 feet in depth.
This was the Firehole River, heading in a lake a few miles to the south.
Following down the course of this stream we presently passed two fine roaring cascades, where the water tumbled over rocks to the depth of 20 and 50 feet successively.
These pretty little falls, if located on an eastern stream, would be celebrated in history and song; here, amid objects so grand as to strain conception and stagger belief, they were passed without a halt.

The cascades were named by Philetus Norris, park superintendent in 1881 for the 12-year-old son of Wyoming's territorial governor John Wesley Hoyt.
Hoyt and his son, Kepler Hoyt, were visiting Yellowstone in 1881 when Norris named the cascades after Kepler.
The Kepler Cascades were described by the Washburn-Langford-Doane Expedition in 1870 but not named until 1881. In his 1871 report to the Secretary of War, Gustavus C. Doane, a member of the expedition described Kepler Cascades as:
September 18 [1870]. -- We broke camp at 9 o'clock, traveling along the slopes of the ridges, skirting the ravines through falling timber, and passing in many places over swampy terraces, for a distance of three miles, when we suddenly came upon a mountain torrent, 40 feet wide, and running through a gorge of trachyte lava 200 feet in depth. This was the Firehole River, heading in a lake a few miles to the south. Following down the course of this stream we presently passed two fine roaring cascades, where the water tumbled over rocks to the depth of 20 and 50 feet successively. These pretty little falls, if located on an eastern stream, would be celebrated in history and song; here, amid objects so grand as to strain conception and stagger belief, they were passed without a halt. 
The cascades were named by Philetus Norris, park superintendent in 1881 for the 12-year-old son of Wyoming's territorial governor John Wesley Hoyt. Hoyt and his son, Kepler Hoyt, were visiting Yellowstone in 1881 when Norris named the cascades after Kepler.
Kepler Cascades