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Trail Conditions
  • Unknown
  • Snow Packed
  • Snow Covered
  • Freeze/thaw Cycle
  • Icy
  • Prevalent Mud
  • Wet
  • Variable
  • Dry
  • Very Dry
Trail Ridden Direction

Trailforks scans users ridelogs to determine the most popular direction each trail is ridden. A good flowing trail network will have most trails flowing in a single direction according to their intension.
The colour categories are based on what percentage of riders are riding a trail in its intended direction.

  • > 96%
  • > 90%
  • > 80%
  • > 70%
  • > 50%
  • < 50%
Trail Ridden Direction

The intendid direction a trail should be ridden.

  • Downhill Only
  • Downhill Primary
  • Both Directions
  • Uphill Primary
  • Uphill Only
  • One Direction

LEGEND
Trail Difficulties
  • Access Road/Trail
  • White
  • Green
  • Blue
  • Black
  • Double Black Diamond

Trail Report Status
  • Clear / Green
  • 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
  • Warning Warning
  • 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
      • 9
      • 12
      • 3


      Open on Jan 12, 2019
      Local Trail Association
      local trail association
      (evergreenmtb.org)

      Stats

      Avg Trail Rating
      Global Ranking
      #188
      State Ranking
      #8
      Trails (view details)
      26
      Trails Mountain Bike
      26
      Trails Hike
      19
      Trails Trail Running
      19
      Total Distance
      11 miles
      Total Descent Distance
      4 miles
      Total Descent
      1,509 ft
      Total Vertical
      160 ft
      Highest Trailhead
      706 ft
      Reports
      361
      Photos
      14
      Ridden Counter
      5,400

      Photos of Black Diamond Open Space Mountain Bike

      136 |
      Jul 21, 2017 @ 8:41pm
      Jul 21, 2017
      Fresh Squeezed, Seattle
      115 |
      Jul 21, 2017 @ 8:40pm
      Jul 21, 2017
      Fresh Squeezed, Seattle
      trail: Spooky
      79 |
      Jul 21, 2017 @ 8:40pm
      Jul 21, 2017
      Spooky, Seattle
      trail: Crooshal
      103 |
      Jul 21, 2017 @ 8:40pm
      Jul 21, 2017
      Crooshal, Seattle
      more photos »

      Videos of Black Diamond Open Space Mountain Bike

      Rock & Roll, Remaster, Tarzan, Chilly Bin...
      trail: Tarzan
      9:57 | 33 | Oct 23, 2018 , Maple Valley
      Rock & Roll, Remaster, Tarzan, Chilly Bin...
      trail: Chilly Bin
      9:57 | 22 | Oct 23, 2018 , Maple Valley
      Rock & Roll, Remaster, Tarzan, Chilly Bin...
      trail: Remaster
      9:57 | 35 | Oct 23, 2018 , Maple Valley
      Rock & Roll, Remaster, Tarzan, Chilly Bin...
      9:57 | 27 | Oct 23, 2018 , Maple Valley
      more videos »

      Black Diamond Open Space Mountain Bike Routes

      titleratingdistance
      Full Sasquatch Loop
      2 miles

      Recent Comments

      usernametypetitlecommentdate
      user #201606washingtonoutdoorfamilytrailFresh SqueezedLily Pas was sweet. Step down is an endless...
      Dec 6, 2018 @ 6:05pm
      Dec 6, 2018
      user #1370752KeetnaWilsontrailSasquatchWhile still dangerous, it was most likely a...
      Oct 26, 2018 @ 11:47pm
      Oct 26, 2018
      user #1635294Mtb-carrottrailSasquatchBe careful, i saw a what appeared to be a wolf...
      Oct 26, 2018 @ 10:20pm
      Oct 26, 2018
      user #1639444Wash2160trailSasquatchThe correct distance and average time need to...
      Oct 16, 2018 @ 6:12pm
      Oct 16, 2018
      user #1556605BarkadatrailFresh SqueezedFun, flowy trail, very well maintained. Lily...
      Sep 30, 2018 @ 7:49am
      Sep 30, 2018
      more »

      Recent Activity

      usernameactiontypetitledate
      user #1699174threemcbridesaddridelogJan 15, 2019 ride log
      Jan 19, 2019 @ 1:05pm
      14 hours
      user #1341915cvanzanaddridelogJan 19, 2019 ride log
      Jan 19, 2019 @ 11:44am
      15 hours
      user #1534566cwisa1addridelogJan 19, 2019 ride log
      Jan 19, 2019 @ 11:38am
      15 hours
      user #1437861JfairaddridelogJan 19, 2019 ride log
      Jan 19, 2019 @ 11:33am
      15 hours
      user #1311264TonylabriolaaddridelogDec 31, 2018 ride log and 1 more
      Jan 19, 2019 @ 8:05am
      19 hours
      view more »
      • By overdrive47 & contributors
      • Admins: BDTC
      • #9635 - 7,094 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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