The Confluence Project Records consist of administrative files, project files, education files, press clippings, and audiovisual materials. The records span the years 1996 to 2016, and document the development of the Confluence Project from its early planning stages through the construction of the earthworks at Cape Disappointment State Park, Vancouver Land Bridge, Sandy River Delta, Sacajawea State Park, and Chief Timothy State Park. Although it has not been built, there is also documentation of a proposed site at Celilo Park. Within the project files, there are extensive designs and site plans of the earthworks as conceived of by artist Maya Lin, as well as eleven oversize models of the sites. The clipping files reveal how the Confluence Project was viewed by local communities and critics who responded to the project. The administrative records document the day-to-day operations of the Confluence Project including fundraising, financial records, meeting minutes, publications, and related material.