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1.9 miles
Distance
30 ft
Climb
-80 ft
Descent
00:08:31
Avg time
-51 ft
Altitude change
45 ft
Altitude min
113 ft
Altitude max
96 ft
Altitude start
46 ft
Altitude end
-0.5%
Grade
-6.8%
Grade max
3.1%
Grade min
1,398 ft
Distance climb
3,222 ft
Distance down
1 mile
Distance flat
00:08:31
Avg time
Under Thunder Details
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Activities
- Mountain Bike
- E-Bike
- Gravel Bike
- Hike
- Trail Running
- Nordic Ski
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Riding AreaUnder Thunder Bike Park
Juneau, Alaska -
Difficulty Rating
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Local Popularity80 in Mountain Biking [+]
- 5 in E-Biking
- 95 in Trail Running
- 5 in Hiking
- 5 in Nordic Skiing
- 5 in Gravel Biking
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Trail TypeDoubletrack
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Bike TypeXC, Gravel
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DirectionBoth Directions[+]
- Both Directions for Gravel Biking
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Climb DifficultyGreen
-
Physical RatingEasy
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Trail VisibilityAlways easy to follow
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Family FriendlyYes
-
Dogs AllowedYes
-
eBike AllowedYes up to Class 1
-
Land OwnerCBJ Parks and Recreation
No community description for Under Thunder trail has been added yet!
AI Generated Description
Under Thunder is a 2 mile popular green difficulty family friendly connector doubletrack trail located near Juneau Alaska. This multi-use trail can be used both directions and has a easy overall physical rating with a 30 ft green climb. Adaptive MTB rating: amtb green. Trail visibility is always easy to follow. On average it takes 8 minutes to complete this trail.
Local Trail Association
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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
- 0 rides
6 Months
- 4 rides
- 30 miles avg distance
All
- 12 rides
- Last: Oct 9, 2026
| c1 | c2 | c3 | c4 |
|---|---|---|---|
January | February | March | April |
May | June | July | August |
September | October | November | December |
Under Thunder 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
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
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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.
Think of this as a heatmap, more activities = more kinetic energy = warmer colors.
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- popular
- less popular
- not popular
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Activity Recordings
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Activity Recordings
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Winter Trails
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Missing Trails
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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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Slope Aspect
Direction the slope faces
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Directions to under-thunder-745503 trailhead
(58.403950, -134.546130)
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Nearby Trails
- Powerline Trail 23 ft
- Bandit 1,086 ft
- Double Blaze 1,532 ft
- Sponge Bob 1,677 ft
- Gladstone Acess 2,185 ft
Under Thunder Bike Park
- By markholloway
Trailforks Map Team & contributors - #745503 - 986 views
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