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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...

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