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1.5 miles
Distance
113 ft
Climb
-78 ft
Descent
00:12:34
Avg time
36 ft
Altitude change
553 ft
Altitude min
615 ft
Altitude max
578 ft
Altitude start
614 ft
Altitude end
0.5%
Grade
-12.7%
Grade max
11.4%
Grade min
2,772 ft
Distance climb
2,031 ft
Distance down
3,084 ft
Distance flat
00:12:34
Avg time
Route 66 Details
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Activities
- Mountain Bike
- Gravel Bike
- Adaptive Bike
- Hike
- Trail Running
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Riding AreaBlack Diamond Open Space
Maple Valley, Washington -
Difficulty Rating
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Local Popularity95 in Mountain Biking [+]
- 90 in Trail Running
- 75 in Hiking
- 5 in Adaptive Biking
- 100 in Gravel Biking
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Trail TypeDirt/Gravel Road
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Bike TypeAM, XC, Adaptive MTB, Gravel
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DirectionBoth Directions[+]
- Both Directions for Trail Running
- Both Directions for Hiking
- Both Directions for Gravel Biking
-
Climb DifficultyGreen
-
Physical RatingEasy
-
Dogs AllowedYes
-
eBike Allowed
-
Ride in RainYes
Fire road that connects the entire Maple Valley-Black Diamond trail area. Links Lake Sawyer (across the road at the south entrance) Black Diamond Open Space, Summit Ridge, and Henry's Ridge together. This is a nice and easy ride that has some very scenic views in the bloom of spring, traverses under power lines, and has a hike-a-bike over some railroad tracks.
Access Info
Starts out of the Black Diamond Open Space Parking Lot.
Local Trail Association
-
-
Please consider joining or donating to the local trail association to supportDonate to earn trail karma!
trail development & maintenance.
Traditionally Indigenous Territory
Recent Activity on Trail
Past Week
- 8 rides
- 8 miles average
6 Months
- 215 rides
- 9 miles avg distance
All
- 2,258 rides
- Last: Oct 26, 2026
| c1 | c2 | c3 | c4 |
|---|---|---|---|
January | February | March | April |
May | June | July | August |
September | October | November | December |
Route 66 Trail Reports
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Trail Conditions
- Unknown
- Snow Groomed
- Snow Packed
- Snow Covered
- Snow Cover Partial
- Freeze/thaw Cycle
- Icy
- Prevalent Mud
- Wet
- Variable
- Ideal
- Dry
- Very Dry
Trail Flow (Ridden Direction)
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The colour categories are based on what percentage of users are riding a trail in its intended direction.
The colour categories are based on what percentage of users are riding a trail in its intended direction.
- > 96%
- > 90%
- > 80%
- > 70%
- > 50%
- < 50%
- bi-directional trail
- no data
Trail Last Used
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- < 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
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Trail Popularity ?
Trailforks scans activity logs 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.
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BC Backroad Status
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Directions to route-66-34021 trailhead
(47.336320, -122.013080)
Photos
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Videos
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Routes with this trail
6 miles • 484 ft • 11 • Out & Back •
A planned route of some of the fun things at Black Diamond/Henry's. Without focusing on the popular...
★ 3.0 • 15 miles • 976 ft • 50 • Point to Point •
This route hits all the advanced trails.
12 miles • 437 ft • 15 •
Highway parking lot to Upper. Easy to moderate trails.
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Black Diamond Open Space
- By overdrive47 & contributors
- #34021 - 2,758 views
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