The CREST planning effort, an estuary-wide, bi-State program, culminated in the 1979 Columbia River Estuary Regional Management Plan. Issues on the Washington side of the river were satisfactorily addressed according to Washington shoreline patterns. However, the Oregon Land Conservation and Development Commission (LCDC) rejected the plan as inconsistent with Statewide planning goals and LCDC guidelines. By late 1980, the dispute focused on the development and/or preservation of five sites; representatives called for mediation. Prodevelopment forces, including four local jurisdictions and Oregon's Department of Economic Development were on one side. Proprotection forces, including the Oregon Department of Fish and Wildlife and various Federal agencies, were on the other. Before negotiations began, ground rules were established; the parties agreed on such issues as who would be at the bargaining table and how the general public would be involved. During the 2-month negotiating period, mediators spent many hours checking with technical advisors, helping negotiators communicate with their constituents, and making sure that all interests were represented at the table. Three levels of agreement were finally reached: (1) an agreement on findings, (2) an agreement on development designations, and (3) an agreement on subarea policies. The parties entered mediation as adversaries and came out the same way, but they did succeed in fashioning an agreement that is being incorporated into local, comprehensive plans. One footnote is included.