In 1986, the area where the Columbia River carves through the Cascade Mountains (the Columbia Gorge) was given protection, with National Scenic Area status. The original paved highway, now known as Historic Columbia River Gorge Highway 30, had long since been divided into isolated sections by the construction of the Bonneville Dam and Interstate 84. In 1998, the Tanner/Moffet Creeks Project was constructed in the highly scenic natural area along the Oregon side of the Columbia River (Wahclella Falls Trailhead, Oregon, and Bonneville, Washington). The plan proposed connecting two sections of Highway 30 by constructing one mile (1.6 km) of highway from Tanner Creek to Moffet Creek. The plan included a bike and pedestrian pathway that will eventually become part of a 100-mi (161-km) trail extending from Portland, Oregon, to The Dalles. One of the greatest challenges was the design of a series of switchbacks to gradually bring the bike path from highway level down to the level of the creek at the point where Tanner Creek passes beneath the bridge. Retaining wall structures were necessary to keep the newly steepened side slopes in place, and the structures needed to fit attractively into the natural environment. A geocellular confinement system with a vegetated fascia was selected and has performed well.

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  • Corporate Authors:

    Industrial Fabrics Association International

    345 Cedar Building, Suite 450
    St Paul, MN  United States  55101-1088
  • Authors:
    • Senf, D F
    • Randolph, S
    • Lee, M
  • Publication Date: 2000-4


  • English

Media Info

  • Features: Figures; Photos;
  • Pagination: p. 44-45
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00792365
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 16 2000 12:00AM