John Day River

Definition and stakes

Lewis Ankeny McArthur,  ../../ (1926)

“ There is a rail road station, John Day, in Clatsop County near the mouth of John Day River that takes its name from the stream, and also a point east of the river known as John Day Point. Lewis and Clark mention the stream in their journals for November 27, 1805, and give the Indian name Kekemarke.
John Day River, Gilliam, Grant, Jefferson, Sherman, Umatilla, Wasco and Wheeler Counties. John Day River is one of the import ant rivers of Oregon, but due to the fact that it drains an area with little rainfall, the stream does not deliver a great deal of water.
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Source: Wikisource

Thomas P. Thayer,  The Geologic Setting of the John Day Country…

“ In contrast, the John Day River has cut a broad, flat-floored valley in the Mascall Formation at the south end of Picture Gorge because the ashy beds weather to fine clay which is easily washed away.
Landslides have marked the face of the John Day Country. Large rock masses commonly slide where steep cliffs form in soft rocks that are capped by hard resistant rocks. When the cliff face becomes too high and steep, the soft beds give way and large blocks or masses slide downward, usually tilting backward as they move, as shown in the diagram of Cathedral Rock on page 15.
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Source: Gutenberg

Thomas P. Thayer,  The Geologic Setting of the John Day Country…

“ The alluvial fans (Rattlesnake Formation) in front of the mountains were built up of bouldery gravels and finer sediments. These materials were eroded from the mountains, carried by streams down the steep narrow canyons, and spread out on the valley floor. Because much more material came into the John Day River from the Strawberry Mountains than from the lower mountains to the north, the river was pushed to the north side of its wide valley. Faulting and erosion have completely destroyed the cones of the volcanoes from which the volcanic rocks were erupted in Miocene and Pliocene time. ”
Source: Gutenberg

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