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2,969 ft
Distance
-486 ft
Descent
00:06:22
Avg time
-486 ft
Altitude change
10,470 ft
Altitude min
10,956 ft
Altitude max
10,956 ft
Altitude start
10,469 ft
Altitude end
-16.4%
Grade
-60.9%
Grade max
-1.9%
Grade min
2,969 ft
Distance down
00:06:22
Avg time
Jam Rock Details
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Activities
- Mountain Bike
- E-Bike
-
Riding AreaKeystone Resort
Keystone, Colorado -
Difficulty Rating
-
Voted DifficultyDouble Black Diamond (1 vote)
-
Local Popularity35 in Mountain Biking [+]
- 45 in E-Biking
-
Global Ranking
-
State Ranking
-
Trail TypeSingletrack
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Bike TypeDH
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DirectionDownhill OnlyPopular Direction Shown
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eBike Allowed
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TTFs on TrailJump
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Land Owner
Features and rocks galore—five larger jump options and a rocky forest with progressive line choices.
Trail Supporters
USFSLand Manager
Bike Park
Traditionally Indigenous Territory
Recent Activity on Trail
Past Week
- 0 rides
6 Months
- 23 rides
- 25 miles avg distance
All
- 81 rides
- Last: Sep 20, 2026
| c1 | c2 | c3 | c4 |
|---|---|---|---|
January | February | March | April |
May | June | July | August |
September | October | November | December |
Jam Rock Trail Reports
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3D
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)
Trailforks scans users activity logs 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 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
Trailforks scans activity logs 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 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.
Think of this as a heatmap, more activities = more kinetic energy = warmer colors.
- most popular
- popular
- less popular
- not popular
ATV/ORV/OHV Filter
Max Vehicle Width
inches
US Cell Coverage
Legend
Radar Time
Activity Recordings
Trailforks uses anonymized public activity data.
?
Activity Recordings
Trailforks uses anonymized public activity data.
?
Winter Trails
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A routing network for winter maps does not exist. Selecting trails using the winter trails layer has been disabled.
Missing Trails
Most Popular
Least Popular
Trails are colored based on popularity. The more popular a trail is, the more red. Less popular trails trend towards green.
Jump Magnitude Heatmap
Heatmap of where users jump on trails. Zoom in to see individual jumps, click circles to view jump details.
BC Backroad Status
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Service Road Atlas is a free to use, community-driven service for viewing and creating reports on the numerous back-country service roads around B.C. and Alberta.
Slope Aspect
Direction the slope faces
Trails Deemphasized
Trails are shown in grey.
Only show trails with no bike usage.
Suggested Layers
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Directions to jam-rock trailhead
(39.586570, -105.942110)
Photos
15 more »
Videos
4 more »
mtb
20:27 |
219 |
Sep 7, 2023 , Keystone
mtb
0:58 |
337 |
Jan 12, 2017 , Keystone
mtb
0:10 |
560 |
Aug 17, 2008 , Keystone
mtb
0:12 |
390 |
Aug 16, 2010 , Keystone
Trail Lists
-
Keystone Bike Park
10 trails
Reviews / Comments
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