Environmental Issues Addressed for the I-105 Willamette to Pacific Hwy Project

Tree removal throughout the project corridor raised potential concern in relation to the Migratory Bird Treaty Act. To address these concerns, ODOT will insure the tree removal is completed prior to the beginning of the nesting season for migratory birds. This will insure no active nests are directly impacted during construction.

Within ODOT’s right-of-way exists a bike path that is heavily utilized by multiple recreational users. ODOT has designed the project to insure continuity is maintained on this path.

During the development of the project, ODOT delineated three wetland and/or open water features within the area of potential impact of the project. ODOT was able to modify the design by steepening the embankment slopes and utilizing guardrail where appropriate to avoid impacts to these resources. ODOT has highlighted these areas on the project plans as “no work areas”.

ODOT also recognizes the potential for Northwestern Pond Turtles to be present in the project area. Prior to commencing work within potential habitat, the area will be checked by a biologist to insure the turtles are not present. If found, efforts to relocate the turtles will be coordinated with ODFW.

ODOT recognized the potential to have federally- and state-listed plants within the project footprint. Initial surveys indicated the presence of potential habitat for the plants of concern, however, subsequent surveys during the flowering season concluded no listed or sensitive plants are growing within the project’s impact area.

Given the proximity to the Willamette River, there was an increased probability of encountering archaeological sites. A registered archaeologist identified one area of concern within the project limits. ODOT was able to modify the design to insure this area would not be impacted.

ODOT will be adding a new impervious surface on I-105 to accommodate the auxiliary lanes from I-5 to Coburg Road and Coburg Road to Delta Highway. As a result, ODOT has planned water quality facilities to treat 140% of the runoff that would result from the new impervious surface.