Cooper's Ferry site

The site is on traditional Nez Perce land, and known to the tribe as the historical village of Nipéhe.

[2] The most recent work at the Coopers Ferry site was a joint effort of Oregon State University and the Bureau of Land Management and led by Loren G. Davis.

A number of spear points from the Western Stemmed Tradition (WSPT or WST) were found in a clearly defined pit.

Several researchers have suggested a later date for the finds,[7] but were rebuffed by Davis noting the criticisms held "many factual errors, completely invented attributions, and poorly constructed arguments.

"[8] The excavators have suggested their finds support the idea that early Americans arrived via a coastal route followed by riverine travel.