Rainy Mountain is a rounded hill standing northwest apart from the main Wichita Mountains in Kiowa County, Oklahoma.
The PBS video https://www.pbs.org/video/n-scott-momaday-word-from-a-bear-odljy7 provides additional historical information regarding the site.
Rainy Mountain Creek, flowing northeastward from Rainy Mountain, was a favored winter camp for Plains Indians, especially the Kiowas, because the grass was green even in winter.
In 1960 the Kiowa County, Washita County and Mountain View Conservation Districts, in conjunction with the Soil Conservation Service (now the Natural Resources Conservation Service), implemented a project to construct 29 flood control dams known as the Rainy Mountain Creek Watershed Project.
This Oklahoma state location article is a stub.