Cooper’s Ferry site Area A excavations at work 2018. Loren Davis, Oregon State University Cooper’s Ferry site Area A excavations at work 2018. Loren Davis and colleagues present new findings from Cooper’s Ferry that provide evidence of repeated occupation beginning between 16,560 to 15,280 years ago. “The Cooper’s Ferry site is located along the Salmon River, which is a tributary of the larger Columbia River basin. He is also awaiting carbon-dating information from artifacts from a second dig location at the Cooper’s Ferry site.