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Trail Conditions
  • Unknown
  • Snow Groomed
  • 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 Last Ridden
Trailforks scans ridelogs to determine the last time a trail was ridden.
  • < 2 days
  • < 1 week
  • < 2 weeks
  • < 1 month
  • < 6 months
  • > 6 months
Trail Ridden Direction
The intended direction a trail should be ridden.
  • Downhill Only
  • Downhill Primary
  • Both Directions
  • Uphill Primary
  • Uphill Only
  • One Direction
ContributeDetails
Colors indicate trail is missing specified detail.
  • Description
  • Photos
  • Description & Photos
  • Videos
Trail Popularity ?
Trailforks scans ridelogs to determine which trails are ridden the most in the last 9 months. Trails are compared with nearby trails in the same city region with a possible 25 colour shades. Think of this as a heatmap, more rides = more kinetic energy = warmer colors.
  • most popular
  • popular
  • less popular
  • not popular

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

  • 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 Groomed
  • 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
  • Sight Sight
  • Restrooms Restrooms
  • eBike Charging Point eBike Charging Point
  • Water Fountain/Source Water Fountain/Source
  • Gate Gate
  • Trail Sign Trail Sign
  • Table or Bench Table or Bench
  • Ladder Ladder
  • Stairs Stairs
  • Bridge Bridge
  • Camping Camping
  • Cabin Cabin
  • Lodge Lodge
  • Bear Cache Bear Cache
  • Dock Dock
  • Ranger Station Ranger Station
  • Summit Summit
  • 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
      • 10
      • 11
      • 3

      Region Status
      Open as of Oct 13, 2019
      Local Trail Association
      local trail association
      (evergreenmtb.org)

      Stats

      Avg Trail Rating
      Global Ranking
      #178
      State Ranking
      #8
      Trails (view details)
      26
      Trails Mountain Bike
      26
      Trails Hike
      19
      Trails Trail Running
      19
      Total Distance
      11 miles
      Total Descent
      1,499 ft
      Total Vertical
      160 ft
      Highest Trailhead
      706 ft
      Reports
      607
      Photos
      24
      Ridden Counter
      8,818

      Popular Black Diamond Open Space Mountain Biking Trails

      Recent Ridelog Activity in Region

      Today
      • 2 rides
      • 8 miles avg distance
      Yesterday
      • 0 rides
      • 0 ft avg distance
      Past Week
      • 19 rides
      • 7 miles avg distance

      Photos of Black Diamond Open Space Mountain Bike

      trail: Crooshal
      25 |
      Jul 18, 2019 @ 3:48pm
      Jul 18, 2019
      trail: Crooshal
      26 |
      Jul 18, 2019 @ 3:48pm
      Jul 18, 2019
      trail: Connector
      9 |
      Jun 21, 2019 @ 1:47pm
      Jun 21, 2019
      59 |
      Jun 1, 2019 @ 1:44pm
      Jun 1, 2019

      Videos of Black Diamond Open Space Mountain Bike

      Tour of Kathleen with JJ
      trail: Kathleen
      2:07 | 60 | Mar 19, 2019
      Tour of Spooky with JJ
      trail: Spooky
      4:30 | 18 | Mar 6, 2019
      3 19 2019 Fresh Squeezed
      7:29 | 204 | Mar 20, 2019 , Maple Valley
      3 19 2019 Sasquatch
      trail: Sasquatch
      14:20 | 179 | Mar 20, 2019 , Maple Valley

      Recent Trail Reports

      Activity Feed

      usernameactiontypetitledate
      user #1944421Springer125riddentrailKathleen
      Oct 16, 2019 @ 11:27pm
      Oct 16, 2019
      user #1954494Los349riddentrailCrooshal and 10 more
      Oct 15, 2019 @ 5:20pm
      Oct 15, 2019
      user #1944421Springer125riddentrailRock & Roll
      Oct 14, 2019 @ 8:53pm
      Oct 14, 2019
      user #1443075AwkragtaddreportTarzan
      Oct 13, 2019 @ 5:30pm
      Oct 13, 2019
      user #991899dubiouslogikriddentrailBrain Wave and 6 more
      Oct 2, 2019 @ 3:14pm
      Oct 2, 2019

      Recent Comments

      usernametypetitlecommentdate
      user #1084182masonguytrailKathleenxD
      Jul 10, 2019 @ 2:04pm
      Jul 10, 2019
      user #3259galbraithridertrailKathleenone of the top trails in Washington
      Jun 29, 2019 @ 4:56pm
      Jun 29, 2019
      user #1717868skuehntrailSuperchargerThis is a fun trail with a challenging...
      Jun 1, 2019 @ 12:12pm
      Jun 1, 2019
      user #1467884sibrillianttrailCrooshalEasy and flows I always hit this whenever...
      Mar 27, 2019 @ 3:13pm
      Mar 27, 2019
      user #1467884sibrillianttrailBlind PigIs this even a trail
      Mar 27, 2019 @ 3:11pm
      Mar 27, 2019

      Nearby Areas

      namedistance
      Summit Ridge 7 6 3 40.6 km
      Henry's Ridge 11 19 60.7 km
      Lake Sawyer 7 44 2 11.1 km
      Green River Gorge 14.1 km
      Selleck6.1 km

      Local Badges

      • By overdrive47 & contributors
      • Admins: BDTC
      • #9635 - 11,463 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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