OR213 MP 10 Spangler Hill Emergency Slide Mitigation & Monitoring

OR213 Cascade Highway South is a rural minor arterial highway located between Portland, Oregon and Salem, Oregon. The average annual daily traffic for 2017 was 15,300 which is an increase of 13% over the past six years. The highway is a critical north-south connector for communities outside of the Portland and Salem metropolitan areas. In the winter of 2016-2017, record rainfall re-activated at least one ancient landslide within an evident landslide complex causing rapid and significant deflection of the roadway on the order of one foot in two weeks. An emergency subsurface investigation program was implemented and monitoring began. Following an official Emergency Declaration by the Governor of Oregon, both short and long term mitigations were implemented by the Oregon Department of Transportation (ODOT).


  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; Photos; References;
  • Pagination: 19p
  • Monograph Title: Proceedings of the 70th Highway Geology Symposium (HGS 2019)

Subject/Index Terms

Filing Info

  • Accession Number: 01735600
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 2 2020 9:42AM