Columbia Gorge Regional/The Dalles Municipal Airport Runway 12-30 | Klickitat County, Washington

Columbia Gorge Regional/The Dalles Municipal Airport Runway 12-30 | Klickitat County, Washington

DESCRIPTION:  Runway 12-30 and Taxiway A at the Columbia Gorge were reconstructed between 2012 and 2013.   The work included pavement reconstruction and raising the southeast end of the runway up to 5 feet to meet FAA line‑of‑sight requirements.  

SERVICE:  Foundation Engineering completed a Phase I investigation to evaluate the existing pavement conditions and provide pavement design parameters and recommendations for subgrade preparation.  Phase I also included infiltration testing to evaluate subgrade drainage.  We completed a Phase II investigation two years later to evaluate potential borrow areas and assist with the preparation of the earthwork specifications to address the re-use of on-site materials.  In addition, Foundation Engineering provided periodic consultation and construction observations.  Geotechnical challenges included variable on‑site materials that consisted primarily of loess and shallow basalt.