How did the Red River get its name?

The Red River begins in Palo Duro Canyon, just south of Amarillo, Texas. It forms the boundary between Texas and Oklahoma, then makes a bend in the southwestern region of Arkansas and enters Louisiana. The river becomes navigable south of Shreveport and, after a series of locks and dams, merges with the mighty Mississippi.

http://www.redriverhistorian.com/maps.html

It is the second longest river associated with Texas. Its name comes from its color, which in turn comes from the fact that the river carries large quantities of red soil in flood periods. The river has a high salt content. The Spanish called the stream Río Rojo, among other names. It was also known in frontier times as the Red River of Natchitoches and the Red River of the Cadodacho (the Caddo Indians).

https://tshaonline.org/handbook/online/articles/rnr01


lib.utexas.edu/geo/rivers.html no longer exists