Black Diamond Open Space (BDOS)
BDOS (Black Diamond Open Space) is east of Hwy 169 & Lake Sawyer, south of Henry's Ridge (separated by the railroad tracks) and north of Summit Ridge. BDOS offers lots of singletrack and variety, but is mostly based around XC. There's a few freeride and downhill trails here and in the nearby Summit Ridge & Henry's Ridge, but by NW Washington standards, BDOS is pretty flat. The only two downhill trails are Fresh Squeezed (a slightly easier intermediate downhill trail) and Crooshal (the slightly more difficult, and more fun intermediate downhill trail). Fresh Squeezed is a loop with a singletrack climb while to access Crooshal you either use the Fresh Squeezed climb and a Connector, or the Powerline Road climb. There's also lots of XC options at BDOS (covered more in the Navigation tab).
Contact Mike Westra email@example.com or Ryan Chase firstname.lastname@example.org if you'd like to help out. Also, check out the Black Diamodn Trails Coalition here: https://www.facebook.com/groups/SummitRidgeHerd/about/