Abstract The Grande Ronde-Joseph Canyon area is located in southeast Washington near the common boundaries of Washington, Oregon, and Idaho (Fig.1). The locality lies within the canyon country which forms the southeast part ofthe Columbia Plateau Province near the eastern termination of the Blue Mountains and the southern boundary of the Lewiston Basin. The site can be reached by following Washington SR 129 south from Clarkston to Asotin, Washington, and then by following the Snake River road (lst street in Asotin) south from Asotin for 25 mi (40 km) to the confluence of the Snake and Grande Ronde rivers. The Snake River road is paved for the first 13 mi (21 km) but then becomes a well-maintained gravel road that serves the area. All sites are easily reached from this road. Land within the area either is owned by the Washington Department of Game, Fish, and Wildlife Service or is private. Information about current ownership can be obtained from the headquarters of the Chief Joseph Fish and Wildlife area in Joseph Canyon (H, Fig.2). Permission must be obtained to visit private land, but landowners understand the significance of the area and have always granted access graciously.

Abstract The Grande Ronde-Joseph Canyon area is located in southeast Washington near the common boundaries of Washington, Oregon, and Idaho (Fig.1). The locality lies within the canyon country which forms the southeast part ofthe Columbia Plateau Province near the eastern termination of the Blue Mountains and the southern boundary of the Lewiston Basin. The site can be reached by following Washington SR 129 south from Clarkston to Asotin, Washington, and then by following the Snake River road (lst street in Asotin) south from Asotin for 25 mi (40 km) to the confluence of the Snake and Grande Ronde rivers. The Snake River road is paved for the first 13 mi (21 km) but then becomes a well-maintained gravel road that serves the area. All sites are easily reached from this road. Land within the area either is owned by the Washington Department of Game, Fish, and Wildlife Service or is private. Information about current ownership can be obtained from the headquarters of the Chief Joseph Fish and Wildlife area in Joseph Canyon (H, Fig.2). Permission must be obtained to visit private land, but landowners understand the significance of the area and have always granted access graciously.