"BDOS offers lots of singletrack and variety, but is mostly based around XC,” according to EvergreenMTB.org. "There’s sic 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."

This massive, complex trail system includes mile upon mile of interconnected non-motorized singletrack. In total, there are at least 64 different named trails in this trail system, plus numerous connections to other nearby trail systems.

You can easily construct a ride of any length and any difficulty in the Black Diamond Open Space—from a quick couple-mile jaunt in the woods, to this meandering 22-mile loop, or an even longer ride if you start connecting every single possible trail option that you pass. If you’re looking for a respectable pedal, try out this recommend trail combination, and then continue adding or subtracting trails from here!

Sources: https://www.evo.com/travel-guides/bike/washington/tacoma-south-puget-sound/bdos-henrys https://www.evergreenmtb.org/trails/bdos