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Trail Conditions
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- Snow Groomed
- Snow Packed
- Snow Covered
- Freeze/thaw Cycle
- Icy
- Prevalent Mud
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- 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.
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
- not popular
ATV/ORV/OHV Filter
Max Vehicle Width
inches
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.
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.
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.
source: Evergreen MTB Alliance: BDOS
Primary Trail Type: Cross-Country
eBikes Allowed:
No
AKA: BDOS
Land Status: City Managed
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
- Mountain Bike
24 trails
- Hike
17 trails
- Trail Running
17 trails
Region Details
- 2
- 10
- 9
- 3
Region Status
Open as of 17 hoursLocal 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
trail: Fresh Squeezed
68 |
Mar 13, 2021 @ 10:19am
Mar 13, 2021
trail: Fresh Squeezed
57 |
Mar 13, 2021 @ 10:11am
Mar 13, 2021
trail: Sasquatch
45 |
Mar 13, 2021 @ 10:04am
Mar 13, 2021Videos of Black Diamond Open Space Mountain Bike
trail: Kathleen
2:07 |
220 |
Mar 19, 2019
trail: Spooky
4:30 |
43 |
Mar 6, 2019
trail: Spike
0:55 |
251 |
Oct 16, 2016
trail: Spike
3:22 |
338 |
Jun 25, 2014
trail: Spike
1:22 |
102 |
Feb 7, 2014
trail: Broken Arm
2:20 |
578 |
Oct 9, 2011
trail: Broken Arm
1:18 |
328 |
Sep 30, 2011
trail: Broken Arm
1:29 |
3989 |
Jul 27, 2011
Recent Trail Reports
| status | trail | date | condition | user | info |
|---|---|---|---|---|---|
| Tarzan | Sep 20, 2021 @ 4:17pm 17 hours | Ideal | DavidBa | ||
| Crooshal | Sep 14, 2021 @ 8:10am Sep 14, 2021 | Dry | kokofosho | ||
| Sasquatch | Sep 12, 2021 @ 9:58am Sep 12, 2021 | Ideal | JiuJitsuMike | ||
| Brain Bucket | Sep 12, 2021 @ 9:58am Sep 12, 2021 | Ideal | JiuJitsuMike | ||
| Grassy | Sep 12, 2021 @ 9:58am Sep 12, 2021 | Ideal | JiuJitsuMike | ||
| Chilly Bin | Sep 12, 2021 @ 9:58am Sep 12, 2021 | Ideal | JiuJitsuMike | ||
| Rock & Roll | Sep 12, 2021 @ 9:58am Sep 12, 2021 | Ideal | JiuJitsuMike | ||
| Fresh Squeezed | Sep 10, 2021 @ 3:45pm Sep 10, 2021 | Dry | allaroundjoe | ||
| Blind Pig | Aug 29, 2021 @ 10:13am Aug 29, 2021 | Dry | daoloth | ||
| Blind Pig | Aug 29, 2021 @ 10:13am Aug 29, 2021 | Dry | daoloth |
Activity Feed
| username | action | type | title | date | |
|---|---|---|---|---|---|
 | DavidBa | add | report | Tarzan | Sep 20, 2021 @ 4:18pm 17 hours |
 | kokofosho | add | report | Crooshal | Sep 14, 2021 @ 8:10am Sep 14, 2021 |
 | JiuJitsuMike | add | report | Sasquatch and 5 more | Sep 12, 2021 @ 1:14pm Sep 12, 2021 |
 | allaroundjoe | add | report | Fresh Squeezed | Sep 10, 2021 @ 7:23pm Sep 10, 2021 |
 | Lmpicard | wishlist | trail | Rock & Roll | Sep 10, 2021 @ 6:27am Sep 10, 2021 |
Recent Comments
| username | type | title | comment | date | |
|---|---|---|---|---|---|
| trail | the descent is fun but too short. | Oct 2, 2020 @ 9:49am Oct 2, 2020 | ||
| report | C uh | Aug 9, 2020 @ 8:58am Aug 9, 2020 | ||
| trail | Completely overgrown as of 8/1. Take Croshool... | Aug 1, 2020 @ 3:47pm Aug 1, 2020 | ||
| trail | This is a fun, twisty section of trail in a... | Jul 8, 2020 @ 4:40pm Jul 8, 2020 | ||
| trail | The brush is getting thick but the trail still... | Jun 30, 2020 @ 11:19am Jun 30, 2020 |
Nearby Areas
| name | distance | ||||
|---|---|---|---|---|---|
| Summit Ridge | 7 | 8 | 3 | 4 | 0.6 km |
| Henry's Ridge | 9 | 19 | 6 | 0.7 km | |
| Lake Sawyer | 10 | 55 | 2 | 1 | 1.1 km |
| Green River Gorge | 1 | 4.1 km | |||
| KANASKAT-PALMER STATE PARK | 11 | 1 | 5.2 km |
Local Badges
-
Completionist19 awarded
Activity Type Stats
| activitytype | trails | distance | descent | descent distance | total vertical | rating | global rank | state rank | photos | reports | routes | ridelogs |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mountain Bike | 24 | 11 miles | 1,440 ft | 4 miles | 161 ft | #250 | #109 | 55 | 1,169 | 9,242 | ||
| Hike | 17 | 8 miles | 814 ft | 3 miles | 157 ft | #367 | #218 | 1,107 | 42 | |||
| Trail Running | 17 | 8 miles | 814 ft | 3 miles | 157 ft | #370 | #218 | 1,107 | 100 |
- By overdrive47 & contributors
- Admins: BDTC
- #9635 - 28,336 views
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