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Trail Conditions
  • Unknown
  • Snow Groomed
  • Snow Packed
  • Snow Covered
  • Freeze/thaw Cycle
  • Icy
  • Prevalent Mud
  • Wet
  • Variable
  • Ideal
  • 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
ATV/ORV/OHV Filter
Max Vehicle Width
inches

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
  • Ideal
  • 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
      • 9
      • 9
      • 3

      Region Status
      Caution as of Jul 30, 2020
      Local Trail Association

      Stats

      Avg Trail Rating
      Trails (view details)
      23
      Trails Mountain Bike
      23
      Trails Hike
      16
      Trails Trail Running
      16
      Total Distance
      11 miles
      Total Descent
      1,440 ft
      Total Vertical
      160 ft
      Highest Trailhead
      706 ft
      Reports
      813
      Photos
      38
      Ridden Counter
      11,902

      Popular Black Diamond Open Space Mountain Biking Trails

      Recent Ridelog Activity in Region

      Today
      • 0 rides
      • 0 ft avg distance
      Yesterday
      • 7 rides
      • 7 miles avg distance
      Past Week
      • 49 rides
      • 7 miles avg distance

      Photos of Black Diamond Open Space Mountain Bike

      trail: Grassy Road
      16 |
      Jul 6, 2020 @ 1:11pm
      Jul 6, 2020
      57 |
      Mar 9, 2020 @ 6:31pm
      Mar 9, 2020
      41 |
      Mar 9, 2020 @ 6:31pm
      Mar 9, 2020
      29 |
      Jan 20, 2020 @ 9:15pm
      Jan 20, 2020

      Videos of Black Diamond Open Space Mountain Bike

      Tour of Kathleen with JJ
      trail: Kathleen
      2:07 | 122 | Mar 19, 2019
      Tour of Spooky with JJ
      trail: Spooky
      4:30 | 32 | Mar 6, 2019
      Golden Spike Edit
      trail: Spike
      0:55 | 218 | Oct 16, 2016
      G Spike
      trail: Spike
      3:22 | 315 | Jun 25, 2014

      Current Trail Warnings

      statustraildateconditionuserinfo
      Brain Wave
      Jul 8, 2020 @ 4:31pm
      Jul 8, 2020
      IdealbpercivalThe section under the power lines is very...
      Supercharger
      Jul 8, 2020 @ 12:51pm
      Jul 8, 2020
      DrybpercivalThe trail is still very overgrown with...

      Recent Trail Reports

      statustraildateconditionuserinfo
      Remaster
      Jul 30, 2020 @ 7:22pm
      Jul 30, 2020
      IdealDenisLM
      Chilly Bin
      Jul 30, 2020 @ 7:22pm
      Jul 30, 2020
      IdealDenisLM
      Sasquatch
      Jul 27, 2020 @ 6:42pm
      Jul 27, 2020
      IdealDenisLM
      Fresh Squeezed
      Jul 20, 2020 @ 12:38pm
      Jul 20, 2020
      IdealkastanridesbikesRiding great. Tad overgrown with spikes
      Little Something Special
      Jul 19, 2020 @ 12:12pm
      Jul 19, 2020
      DrySeabass1975First time here - thought was trail was...
      Connector
      Jul 18, 2020 @ 6:53pm
      Jul 18, 2020
      IdealJiuJitsuMike
      Crooshal
      Jul 18, 2020 @ 6:53pm
      Jul 18, 2020
      VariableJiuJitsuMike
      Tarzan
      Jul 18, 2020 @ 6:53pm
      Jul 18, 2020
      IdealJiuJitsuMike
      Rock & Roll
      Jul 18, 2020 @ 6:53pm
      Jul 18, 2020
      WetJiuJitsuMike
      Spike
      Jul 18, 2020 @ 10:37am
      Jul 18, 2020
      VariablepaulrbrownBit overgrown; perhaps a matter of taste....

      Activity Feed

      usernameactiontypetitledate
      user #1858948TheRDRriddentrailRock & Roll and 5 more
      Aug 4, 2020 @ 1:49pm
      16 hours
      user #2008802ramastersoncommenttrailSupercharger
      Aug 1, 2020 @ 3:47pm
      Aug 1, 2020
      user #2247354DjserdriddentrailRock & Roll and 5 more
      Jul 31, 2020 @ 10:41pm
      Jul 31, 2020
      user #1356658DenisLMaddreportRemaster and 1 more
      Jul 31, 2020 @ 3:54pm
      Jul 31, 2020
      user #2190295Frdbronco8votetrailSasquatch
      Jul 29, 2020 @ 10:12pm
      Jul 29, 2020

      Recent Comments

      usernametypetitlecommentdate
      user #2008802ramastersontrailSuperchargerCompletely overgrown as of 8/1. Take Croshool...
      Aug 1, 2020 @ 3:47pm
      Aug 1, 2020
      user #1864580bpercivaltrailSpookyThis is a fun, twisty section of trail in a...
      Jul 8, 2020 @ 4:40pm
      Jul 8, 2020
      user #1864580bpercivaltrailKathleenThe brush is getting thick but the trail still...
      Jun 30, 2020 @ 11:19am
      Jun 30, 2020
      user #1887268benlewtrailSuperchargerTrail is super overgrown to the point where...
      Jun 27, 2020 @ 10:04pm
      Jun 27, 2020
      user #1514278yarbtrailBlind PigThis is an awesome trail. One of my favorites...
      Apr 9, 2020 @ 8:29pm
      Apr 9, 2020

      Nearby Areas

      namedistance
      Summit Ridge 7 7 3 40.6 km
      Henry's Ridge 11 20 60.7 km
      Lake Sawyer 7 45 2 11.1 km
      Green River Gorge 14.1 km
      Selleck6.2 km

      Local Badges

      • By overdrive47 & contributors
      • Admins: BDTC
      • #9635 - 18,171 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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