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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
Contribute Details
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
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ATV/ORV/OHV Filter
Max Vehicle Width
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Radar Time
Activity Recordings
Trailforks users anonymized public ridelogs from the past 6 months.
  • mountain biking recent
  • mountain biking (>6 month)
  • hiking (1 year)
  • moto (1 year)
Activity Recordings
Trailforks users anonymized public skilogs from the past 12 months.
  • Downhill Ski
  • Backcountry Ski
  • Nordic Ski
Jump Magnitude Heatmap
Heatmap of where riders jump on trails. Zoom in to see individual jumps, click circles to view jump details.
Trails Deemphasized
Trails are shown in grey.
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      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
      Land Status: City Managed
      Powerline Trailhead 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.
      Activities Click to view
      Region Details
      • 2
      • 10
      • 9
      • 3

      Region Status
      Open as of 17 hours
      Local Trail Association

      Stats

      Avg Trail Rating
      Trails (view details)
      24
      Trails Mountain Bike
      24
      Trails Hike
      17
      Trails Trail Running
      17
      Total Distance
      11 miles
      Total Descent
      1,440 ft
      Total Vertical
      160 ft
      Highest Trailhead
      706 ft
      Reports
      1,171
      Photos
      55
      Ridden Counter
      15,985

      Popular Black Diamond Open Space Mountain Biking Trails

      Recent Ridelog Activity in Region

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

      Photos of Black Diamond Open Space Mountain Bike

      trail: Sasquatch
      46 |
      May 22, 2021 @ 1:37pm
      May 22, 2021
      trail: Master Link
      19 |
      May 22, 2021 @ 1:37pm
      May 22, 2021
      trail: Master Link
      38 |
      May 22, 2021 @ 1:36pm
      May 22, 2021
      trail: Sasquatch
      51 |
      Mar 13, 2021 @ 10:50am
      Mar 13, 2021
      trail: Sasquatch
      49 |
      Mar 13, 2021 @ 10:50am
      Mar 13, 2021
      68 |
      Mar 13, 2021 @ 10:19am
      Mar 13, 2021
      57 |
      Mar 13, 2021 @ 10:11am
      Mar 13, 2021
      trail: Sasquatch
      45 |
      Mar 13, 2021 @ 10:04am
      Mar 13, 2021

      Videos of Black Diamond Open Space Mountain Bike

      Tour of Kathleen with JJ
      trail: Kathleen
      2:07 | 220 | Mar 19, 2019
      Tour of Spooky with JJ
      trail: Spooky
      4:30 | 43 | Mar 6, 2019
      Golden Spike Edit
      trail: Spike
      0:55 | 251 | Oct 16, 2016
      G Spike
      trail: Spike
      3:22 | 338 | Jun 25, 2014
      Golden Spike trail
      trail: Spike
      1:22 | 102 | Feb 7, 2014
      Civic Dirt Jump Sesh
      trail: Broken Arm
      2:20 | 578 | Oct 9, 2011
      Duthie and Chuckanut Jumps...Really bored!
      trail: Broken Arm
      1:18 | 328 | Sep 30, 2011
      Short Ride
      trail: Broken Arm
      1:29 | 3989 | Jul 27, 2011

      Recent Trail Reports

      statustraildateconditionuserinfo
      Tarzan
      Sep 20, 2021 @ 4:17pm
      17 hours
      IdealDavidBaLarge tree down across trail, blocking...
      Crooshal
      Sep 14, 2021 @ 8:10am
      Sep 14, 2021
      DrykokofoshoAn old man with three small dogs told me...
      Sasquatch
      Sep 12, 2021 @ 9:58am
      Sep 12, 2021
      IdealJiuJitsuMike
      Brain Bucket
      Sep 12, 2021 @ 9:58am
      Sep 12, 2021
      IdealJiuJitsuMike
      Grassy
      Sep 12, 2021 @ 9:58am
      Sep 12, 2021
      IdealJiuJitsuMike
      Chilly Bin
      Sep 12, 2021 @ 9:58am
      Sep 12, 2021
      IdealJiuJitsuMike
      Rock & Roll
      Sep 12, 2021 @ 9:58am
      Sep 12, 2021
      IdealJiuJitsuMike
      Fresh Squeezed
      Sep 10, 2021 @ 3:45pm
      Sep 10, 2021
      Dryallaroundjoe
      Blind Pig
      Aug 29, 2021 @ 10:13am
      Aug 29, 2021
      Drydaoloth
      Blind Pig
      Aug 29, 2021 @ 10:13am
      Aug 29, 2021
      DrydaolothTrail hard to see in places because of...

      Activity Feed

      usernameactiontypetitledate
      user #2859324DavidBaaddreportTarzan
      Sep 20, 2021 @ 4:18pm
      17 hours
      user #590838kokofoshoaddreportCrooshal
      Sep 14, 2021 @ 8:10am
      Sep 14, 2021
      user #2226376JiuJitsuMikeaddreportSasquatch and 5 more
      Sep 12, 2021 @ 1:14pm
      Sep 12, 2021
      user #1987309allaroundjoeaddreportFresh Squeezed
      Sep 10, 2021 @ 7:23pm
      Sep 10, 2021
      user #1345694LmpicardwishlisttrailRock & Roll
      Sep 10, 2021 @ 6:27am
      Sep 10, 2021

      Recent Comments

      usernametypetitlecommentdate
      user #1883622jmbrunsontrailFresh Squeezedthe descent is fun but too short.
      Oct 2, 2020 @ 9:49am
      Oct 2, 2020
      user #2291054CydsquatchreportRemasterC uh
      Aug 9, 2020 @ 8:58am
      Aug 9, 2020
      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

      Nearby Areas

      namedistance
      Summit Ridge 7 8 3 40.6 km
      Henry's Ridge 9 19 60.7 km
      Lake Sawyer 10 55 2 11.1 km
      Green River Gorge 14.1 km
      KANASKAT-PALMER STATE PARK 11 15.2 km

      Local Badges


      Activity Type Stats

      activitytypetrailsdistancedescentdescent distancetotal verticalratingglobal rankstate rankphotosreportsroutesridelogs
      Mountain Bike2411 miles1,440 ft4 miles161 ft
      #250#109551,1699,242
      Hike178 miles814 ft3 miles157 ft
      #367#2181,10742
      Trail Running178 miles814 ft3 miles157 ft
      #370#2181,107100
      • By overdrive47 & contributors
      • Admins: BDTC
      • #9635 - 28,336 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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