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Trail Conditions
  • Unknown
  • Snow Packed
  • Snow Covered
  • Freeze/thaw Cycle
  • Icy
  • Prevalent Mud
  • Wet
  • Variable
  • Dry
  • Very Dry
LEGEND
Trail Difficulties
  • Access Road/Trail
  • White
  • Green
  • Blue
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  • Double Black Diamond

Trail Report Status
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  • Minor Issue / Yellow
  • Significant Issue / Amber
  • Closed or Major Issue / Red

  • Land Owner Overlay
  • Wilderness (typically no bikes in USA)
  • BLM (public)
  • USFS (Wildlife sanctuaries darker than usfs)
  • State land
  • Indigenous
  • Military
Trail Conditions
  • Unknown
  • Snow Packed
  • Snow Covered
  • Freeze/thaw Cycle
  • Icy
  • Prevalent Mud
  • Wet
  • Variable
  • Dry
  • Very Dry
  • Map Markers
  • trail Trail Head
  • photo Photo
  • place Directory Listing
  • region Riding Area
  • TTF TTF
  • Parking Parking
  • Viewpoint Viewpoint
  • Information Information
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  • Directions Directions
  • Water Fountain/Source Water Fountain/Source
  • Sight Sight
  • Restrooms Restrooms
  • Gate Gate
  • Camping Camping
  • Trail Sign Trail Sign
  • Table or Bench Table or Bench
  • Other Other
      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 Life 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.

      Through its partnership with King County Parks, Evergreen is currently maintaining the BDOS trails and working on a high level conceptual plan for future new trails in the BDOS area.

      Goals for future trails will be to provide the longest continuous climbs and descents in the entire BD/MV area, as well as to add skill-building trails and features like jumps, drops, and a pump track.

      With the new BDOS trails there are a variety of opportunities for all skill levels all in one area, which will only improve with the completion of Phase 2.
      Primary Trail Type: Cross-Country
      eBikes Allowed: No
      AKA: BDOS
      Parking google parking directions
      Access Info:
      Black Diamond Open Space parking lot is located on the east side of Highway 169, just south of Four Corners in Maple Valley.
      Region Details
      • 2
      • 11
      • 12
      • 1

      Caution on 13 hours
      Local Trail Association
      local trail association
      (evergreenmtb.org)

      Stats

      Avg Trail Rating
      Global Ranking
      #206
      State Ranking
      #8
      Trails
      26
      Total Distance
      12 miles
      Total Descent Distance
      5 miles
      Total Descent
      1,952 ft
      Highest Trailhead
      706 ft
      Total Vertical
      160 ft
      Reports
      279
      Photos
      12
      Ridden Counter
      4,195

      Popular Black Diamond Open Space Mountain Bike Trails

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      Recent Trail Reports

      Current Trail Warnings

      traildateinfo
      3 Sisters
      Mar 18, 2018 @ 2:21pm
      Mar 18, 2018
      Trail has been reclaimed by nature and no...

      Photos of Black Diamond Open Space Mountain Bike

      105 |
      Jul 21, 2017 @ 8:41pm
      Jul 21, 2017
      Fresh Squeezed, Seattle
      82 |
      Jul 21, 2017 @ 8:40pm
      Jul 21, 2017
      Fresh Squeezed, Seattle
      trail: Spooky
      63 |
      Jul 21, 2017 @ 8:40pm
      Jul 21, 2017
      Spooky, Seattle
      trail: Crooshal
      81 |
      Jul 21, 2017 @ 8:40pm
      Jul 21, 2017
      Crooshal, Seattle
      more photos »

      Black Diamond Open Space Mountain Bike Routes

      titleratingdistance
      Full Sasquatch Loop
      2 miles

      Recent Comments

      usernametypetitlecommentdate
      user #619922KerplunkreportCrooshalRunning much better now but still needs some...
      Sep 21, 2018 @ 8:45pm
      13 hours
      user #1575198cwillforealtrailLittle Something SpecialBring clippers for the black berries
      Aug 12, 2018 @ 8:40pm
      Aug 12, 2018
      user #1370752KeetnaWilsontrailSasquatch ExtensionWhile it's perfectly fine to ride this trail...
      May 22, 2018 @ 9:11pm
      May 22, 2018
      user #1370752KeetnaWilsontrailBrain WaveIf there's any beginners out there, this trail...
      May 5, 2018 @ 3:27pm
      May 5, 2018
      user #1370752KeetnaWilsontrailSasquatchNote: I added the extension as a new trail,...
      May 1, 2018 @ 10:35pm
      May 1, 2018
      more »

      Recent Activity

      usernameactiontypetitledate
      user #619922KerplunkcommentreportCrooshal
      Sep 21, 2018 @ 8:45pm
      13 hours
      user #619922KerplunkaddreportSupercharger and 2 more
      Sep 21, 2018 @ 8:43pm
      13 hours
      user #619922KerplunkaddridelogSep 21, 2018 ride log
      Sep 21, 2018 @ 8:30pm
      13 hours
      user #1060018swartzieaddridelogSep 21, 2018 ride log
      Sep 21, 2018 @ 5:10pm
      17 hours
      user #1156836nwgarywrightaddridelogSep 20, 2018 ride log
      Sep 20, 2018 @ 7:03pm
      2 days
      view more »
      • By overdrive47 & contributors
      • Admins: BDTC
      • #9635 - 5,911 views
      • black diamond open space activity log | embed map of Black Diamond Open Space mountain bike trails | black diamond open space mountain biking points of interest
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