Oregon Hwy 18 Newberg-Dundee Bypass Phase 1H Wetland Mitigation

Phase 1 of the Oregon Department of Transportation’s (ODOT) Highway 18 Newberg-Dundee Bypass is currently under construction and expected to open in 2017.  Phase 1’s initial four-mile expressway will extend from OR 219 to OR 99W south of Dundee.  The Bypass will significantly reduce traffic congestion on OR 99W and improve livability and overall traffic flow in the surrounding communities.


The full 11-mile bypass is planned to be a four-lane expressway, two lanes in each direction, from Dayton to just east of Newberg.  ODOT’s goal for this project is to improve traffic safety particularly along the OR 99W corridor where through-traffic shares the road with local traffic.  Travel time through Newberg and Dundee will be reduced by 50–60%.  Compensatory mitigation for unavoidable project impacts to area wetlands have been permitted to be constructed within the Bypass’ corridor, associated with the Yamhill and Willamette Rivers.

HENDERSON has been directly contracted by ODOT for conducting the mitigation planting work associated with Phase 1H of the project.  HENDERSON’s work will include removal of invasive and undesirable non-native species, placing 15.6 acres of compost throughout multiple native planting areas, installation of 45,695 native trees, shrubs, live stakes, bulbs, rhizomes, and herbaceous plantings; and hydroseeding 64.1 acres with native seed mixes.  Additionally, HENDERSON will maintain and monitor these wetland mitigation areas for three years post-construction.

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