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SaveBlack 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
28 trails
- Hike
20 trails
- Trail Running
20 trails
Region Details
- 3
- 10
- 6
- 2
Region Status
Open as of Apr 19, 2025Local Trail Association
Stats
- Avg Trail Rating
- Trails (view details)
- 21
- Trails Mountain Bike
- 33
- Trails Hike
- 20
- Trails Trail Running
- 20
- Total Distance
- 12 miles
- Total Descent
- 1,346 ft
- Total Vertical
- 160 ft
- Highest Trailhead
- 706 ft
- Reports
- 1,644
- Photos
- 77
- Ridden Counter
- 24,103
Popular Black Diamond Open Space Mountain Biking Trails
Black Diamond Open Space Mountain Bike Routes
| title | rating | distance |
|---|---|---|
| Out and Back Pedal to Flow | 6 miles | |
| Black Diamond 2 | 10 miles | |
| To Upper Beaver 12 mi | 12 miles | |
| 6 mile Black Diamond Open Space Ride | popular ridelog | 6 miles |
| 5 mile Black Diamond Open Space Ride | popular ridelog | 5 miles |
| 6 mile Black Diamond Open Space Ride | popular ridelog | 6 miles |
| 4 mile Black Diamond Open Space Ride | popular ridelog | 4 miles |
| 7 mile Black Diamond Open Space Ride | popular ridelog | 7 miles |
| 5 mile Black Diamond Open Space All-Mountain Ride | popular ridelog | 5 miles |
| 4 mile Black Diamond Open Space All-Mountain Ride | popular ridelog | 4 miles |
Photos of Black Diamond Open Space Mountain Bike
trail: Crooshal
38 |
Sep 1, 2024 @ 9:14pm
Sep 1, 2024
trail: Brain Bucket
35 |
Nov 5, 2023 @ 3:07pm
Nov 5, 2023
trail: Little Something Special
57 |
Jun 24, 2023 @ 7:30pm
Jun 24, 2023
trail: Blind Pig
116 |
May 22, 2023 @ 12:13pm
May 22, 2023
trail: Blind Pig
74 |
May 22, 2023 @ 12:13pm
May 22, 2023
trail: BDOS-Lake Sawyer Connector
259 |
Jan 28, 2022 @ 12:22am
Jan 28, 2022
trail: BDOS-Lake Sawyer Connector
178 |
Jan 28, 2022 @ 12:21am
Jan 28, 2022
trail: Sasquatch
177 |
May 22, 2021 @ 1:37pm
May 22, 2021Videos of Black Diamond Open Space Mountain Bike
trail: Kathleen
2:07 |
361 |
Mar 19, 2019
trail: Spooky
4:30 |
74 |
Mar 6, 2019
trail: Spike
0:55 |
296 |
Oct 16, 2016
trail: Supercharger
4:06 |
11 |
Feb 16, 2025 , Maple Valley
trail: Crooshal
3:41 |
20 |
Feb 9, 2025 , Maple Valley
trail: Broken Arm
2:20 |
601 |
Oct 9, 2011
trail: Broken Arm
0:18 |
341 |
Sep 30, 2011
trail: Broken Arm
0:29 |
4026 |
Jul 27, 2011
Recent Trail Reports
| status | trail | date | condition | info | user |
|---|---|---|---|---|---|
| Rock & Roll | Apr 19, 2025 @ 11:24am Apr 19, 2025 | Ideal | marebearrr | ||
| Tarzan | Apr 19, 2025 @ 11:24am Apr 19, 2025 | Ideal | marebearrr | ||
| Fresh Squeezed | Apr 19, 2025 @ 11:24am Apr 19, 2025 | Ideal | marebearrr | ||
| Route 66 | Apr 19, 2025 @ 11:24am Apr 19, 2025 | Ideal | marebearrr | ||
| Grassy Road | Apr 13, 2025 @ 3:30pm Apr 13, 2025 | Variable | JustinLGVvgX | ||
| Brain Wave | Apr 13, 2025 @ 6:16pm Apr 13, 2025 | Ideal | JustinLGVvgX | ||
| Little Something Special | Apr 3, 2025 @ 5:30pm Apr 3, 2025 | Ideal | Awkragt | ||
| Blind Pig | Apr 3, 2025 @ 5:30pm Apr 3, 2025 | Ideal | Awkragt | ||
| Crooshal | Mar 2, 2025 @ 3:42pm Mar 2, 2025 | Ideal | Alspins | ||
| Supercharger | Feb 26, 2025 @ 2:11pm Feb 26, 2025 | Ideal | mdashrides |
Activity Feed
| username | action | type | title | date |
|---|---|---|---|---|
| marebearrr | add | report | activity #70162185 and 3 more | Apr 22, 2025 @ 12:29pm Apr 22, 2025 |
| JustinLGVvgX | add | report | activity #69618700 and 1 more | Apr 14, 2025 @ 7:02am Apr 14, 2025 |
| JustinLGVvgX | add | report | activity #69600686 | Apr 13, 2025 @ 6:16pm Apr 13, 2025 |
| Lehning | wishlist | region | activity #68997007 | Apr 4, 2025 @ 2:44pm Apr 4, 2025 |
| Awkragt | add | report | activity #68972700 and 1 more | Apr 4, 2025 @ 7:53am Apr 4, 2025 |
Recent Comments
| username | type | title | comment | date |
|---|---|---|---|---|
| report | O l l lom m ill | Feb 28, 2025 @ 5:15pm Feb 28, 2025 | ||
| trail | @denidil - I feel her pain. I'm very much a... | Sep 30, 2024 @ 2:50pm Sep 30, 2024 | ||
| trail | The steepest climb of all the trails in BDOS.... | Sep 23, 2024 @ 4:13pm Sep 23, 2024 | ||
| trail | This is a confusing trail. Recently they put... | Jul 8, 2024 @ 9:54pm Jul 8, 2024 | ||
| trail | Too narrow to be a proper green, like... | Apr 22, 2024 @ 4:00pm Apr 22, 2024 |
Nearby Areas
| name | distance | ||||
|---|---|---|---|---|---|
| Summit Ridge | 7 | 5 | 3 | 4 | 0.6 km |
| Henry's Ridge Open Space | 10 | 22 | 4 | 0.7 km | |
| Lake Sawyer | 9 | 48 | 2 | 1.1 km | |
| Legacy Park | 16 | 2.2 km | |||
| Cedar Creek Park | 4 | 6 | 3.5 km |
Local Badges
-
Completionist25 awarded
Local Products
Activity Type Stats
| activitytype | trails | distance | descent | descent distance | total vertical | rating | global rank | state rank | photos | reports | routes | ridelogs |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mountain Bike | 28 | 12 miles | 1,345 ft | 4 miles | 161 ft | #336 | #163 | 77 | 1,661 | 3 | 17,100 | |
| Hike | 20 | 10 miles | 719 ft | 3 miles | 157 ft | #534 | #337 | 1,554 | 76 | |||
| Trail Running | 20 | 10 miles | 719 ft | 3 miles | 157 ft | #538 | #335 | 1,554 | 219 |
- By overdrive47 & contributors
- Admins: BDTC, EMBA-C2S
- #9635 - 63,147 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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