This thesis is a preliminary archaeological predictive model and project-planning tool created for the Oregon Department of Transportation (ODOT) as part of a statewide planning effort to enhance the agency's ability to assess the potential impacts of highway projects on archaeological resources. This model addresses the archaeological sensitivity of the US 30 highway corridor from Portland, Oregon to Astoria, Oregon. The highway corridor is divided into 7 separate segments for management purposes and each segment is given a low, medium, or high probability rating for its potential to yield archaeological resources in this model. The ratings are accompanied by planning and maintenance recommendations to be integrated into a comprehensive planning document for the corridor. Probability determinations are based on State Historic Preservation Office (SHPO) archaeological records, physiographic data, dominant vegetation zones, General Land Office maps, ethnographic accounts, and historical records. The precise utility of this model is unknown because cross-tabulations that compare actual and model assigned presence or absence of resources have not been made. Low probability ratings are assigned to 27% of the corridor. Medium probability segments comprise 15% of the corridor. High probability rating account for 58% of the total length of the corridor. The segment with the highest site density is segment 2, averaging .63 archaeological sites per mile. The archaeological probability ratings were initially omitted from the Draft Corridor Management Plan of 1998, but have been included in the Final Corridor Management Plan of 1999. The predictive model results were incorrectly added to the document and consequently create false impressions. In the Final Corridor Management Plan the number of sites listed for segment 2 is incorrect. It is indicated that seven archaeological sites are present within the corridor, but the actual number is fourteen. Furthermore, the percentage ratings of low, medium, and high archaeological probability are erroneously provided for segments 3, 4, and 7 in the final plan. Ultimately this report has proven useful to ODOT archaeological staff, however signs indicate that the data provided to planning personnel has had little impact on project planning and design. / Graduation date: 2003