X-Plane 9.70 Scenery--S15 Happy Valley Airport, Oregon (OR), USA, 1.00. Here is another interesting rich fellow's Galts Gulch getaway. The 'valley' is actually atop an 800-foot flat-topped foothill almost due south of Troutdale. The FAA designation is OL03. It's a private asphalt strip without markings or lights, for emergency landing only! Uses OpenSceneryX buildings and some custom buildings and modified some XP ones (with permission). Orthoimages are from the USGS and processed in Gimp. Requires OpenSceneryX. By Richard Nilsson.