Black Diamond Open Space (BDOS), a partnership between Evergreen Mountain Bike Alliance and King County Parks, is a centrally-located area consisting of a stacked loop network of new and existing trails connecting several popular mt biking trail systems together: Henry’s Ridge to the north, Summit Ridge (and Real Live Church) to the south and Lake Sawyer to the west.  

Differing from the techy and twisty trails of Henry, Sawyer, and Summit Ridge, the new trails at BDOS offer riders fun, flowy, and family-friendly rides on which to learn and progress. These trails were constructed with funding from a King County Community Partnership Grant, King County Youth Sports Facility Grant and a grant from REI.

Phase 2 was completed as of September 2016 with a grand opening, with even more new trails in 2019!

For 2021, Evergreen is partnering with King County Parks to maintain existing trails and working together on a high level conceptual plan for future new trails in the BDOS area.

In partnership with...