Mountain Lakes 100

Mountain Lakes 100 is a scenic 100-mile trail running race held at Olallie Lake, Oregon. The course features rugged, technical terrain with rocky sections and stunning mountain views, including 60 miles along the Pacific Crest Trail. Runners pass dozens of lakes, showcasing some of Oregon's best trail running landscapes.

The event is well-supported with numerous aid stations staffed by experienced volunteers focused on helping participants finish. It serves as a Western States 100 qualifier and has a capacity of 150 runners. A unique aspect is the mandatory 8-hour trail work requirement to promote trail maintenance and community involvement. Visit the organization's website for the most recent information.