Newburg - Dundee Bypass Design Draft Environmental Impact Statement
The Oregon Department of Transportation (ODOT) completed a bypass route for Highway 99W and OR-18 to improve traffic near Newberg and Dundee and to integrate it with an existing bypass around McMinnville. Cornforth Consultants (CCI), as a member of the Parametrix team, was retained to assist ODOT with the planning process and environmental impact statements.
Geologic reconnaissance and preliminary subsurface explorations were performed. The new highway route crosses low-lying areas underlain by silt and sand alluvium. The groundwater is relatively shallow with seasonal highs near the ground surface. CCI evaluated the relative risks and consequences of geologic conditions along the proposed route. Challenges for construction and operation of the highway include:
CCI provided recommendations for optimizing the horizontal and vertical alignment of the new highway within the designated corridor. CCI also presented geotechnical findings and recommendations at several project and public meetings.