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Archaeological Investigations at the Ripple Site (35CL55) in the Mt. Hood National Forest, Clackamas County, Oregon

Archaeological Investigations at the Ripple Site (35CL55) in the Mt. Hood National Forest, Clackamas County, Oregon, by Clayton G. Lebow. 1985. ($12.00)

Prehistoric site 35CL55-Ripple Site-in the Mt. Hood National Forest was revealed during routine monitoring of road construction. Situated at the confluence of the Clackamas River and the Oak Grove Fork, the Ripple Site encompasses 31 acres of a gently rolling, heavily timbered, high bench. The U.S.D.A. Forest Service tested the site and found that the Ripple Site qualified for inclusion on the National Register of Historic Places. The decision was made to mitigate impacts of the Ripple Timber Sale through data recovery. In 1983, surface collection defined two large surface concentrations of cultural material; testing proved that the subsurface distribution of cultural material correlated with the surface distribution; excavation concentrated on data recovery from the two areas of concentrated cultural material. The site was used primarily as a lithic reduction area, with only minor horizontal and vertical use differentiation within the site. The vast majority of the materials used in the lithic reduction processes were cryptocrystalline silicas, with minor amounts of obsidian and basalt present. The obsidian was sourced to the Willamette Valley. Among the conclusions reached through analysis of the site is that as early as 8000 years before present, the western Cascade Mountains were occupied by an indigenous group of people with at least economic ties to the Willamette Valley.

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