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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
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Trail Flow (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%
- bi-directional trail
- no data
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
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US Cell Coverage
Legend
Radar Time
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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
- Snowmobile
Winter Trails
Warning
A routing network for winter maps does not exist. Selecting trails using the winter trails layer has been disabled.
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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 riders jump on trails. Zoom in to see individual jumps, click circles to view jump details.
Trails Deemphasized
Trails are shown in grey.
Only show trails with NO bikes.
Save the current map location and zoom level as your default home location whenever this page is loaded.
SaveCBJ mountain bike park with two new trails built in 2023, adding to the existing Paydirt, BTV, and Sidewinder trails. Plans for building two more trails in the future.
Thanks to Brian Stoody for pioneering the area, and Collin WG for doing a lot of work on the trails over the years. And thanks to Michele Elfers with Parks and Rec for working with JMBA to develop the bike park and new trails.
Thanks to Brian Stoody for pioneering the area, and Collin WG for doing a lot of work on the trails over the years. And thanks to Michele Elfers with Parks and Rec for working with JMBA to develop the bike park and new trails.
Primary Trail Type: All-Mountain & Downhill
Land Status: City Managed
Land Manager: CBJ Parks and Recreation
google parking directions Access Info:
Thunder Mountain alluvial fan zone in Mendenhall Valley. Access from Jennifer Drive trailhead.
Activities Click to view
- Mountain Bike
16 trails
- E-Bike
16 trails
Region Details
- 1
- 9
- 1
- 3
Region Status
Open as of May 30, 2025
Stats
- Avg Trail Rating
- Trails (view details)
- 14
- Trails Mountain Bike
- 16
- Trails E-Bike
- 16
- Trails Hike
- 10
- Trails Trail Running
- 10
- Total Distance
- 3 miles
- Total Descent Distance
- 2 miles
- Total Descent
- 565 ft
- Total Vertical
- 153 ft
- Highest Trailhead
- 208 ft
- Reports
- 76
- Photos
- 108
- Ridden Counter
- 286
Popular Thunder Mountain Bike Park Trails
Photos of Thunder Mountain Bike Park Mountain Bike
trail: CBJ service road
63 |
May 13, 2023 @ 1:39pm
May 13, 2023
trail: Spruce Dust
35 |
Aug 11, 2022 @ 3:31pm
Aug 11, 2022
trail: Spruce Dust
25 |
Aug 11, 2022 @ 3:31pm
Aug 11, 2022
trail: Paydirt
61 |
Aug 11, 2022 @ 3:31pm
Aug 11, 2022
trail: Paydirt
50 |
Aug 9, 2022 @ 8:42pm
Aug 9, 2022
trail: Paydirt
57 |
Aug 9, 2022 @ 8:39pm
Aug 9, 2022
trail: Paydirt
65 |
Jul 12, 2022 @ 9:37pm
Jul 12, 2022
trail: Paydirt
63 |
Jul 6, 2022 @ 7:17pm
Jul 6, 2022Videos of Thunder Mountain Bike Park Mountain Bike
trail: BTV
0:10 |
418 |
Jun 16, 2020
Recent Trail Reports
| status | trail | date | condition | info | user |
|---|---|---|---|---|---|
| Gladstone Acess | May 30, 2025 @ 3:47pm May 30, 2025 | Wet | joshinak | ||
| Dream Zone | May 29, 2025 @ 2:12pm May 29, 2025 | Wet | joshinak | ||
| Valley Blvd Connector | May 29, 2025 @ 2:12pm May 29, 2025 | Wet | joshinak | ||
| Thunder Mt Uptrack | May 4, 2025 @ 2:28pm May 4, 2025 | Variable | joshinak | ||
| Connector | Apr 26, 2025 @ 12:06pm Apr 26, 2025 | Variable | joshinak | ||
| Paydirt | Apr 2, 2025 @ 11:52am Apr 2, 2025 | Prevalent Mud | joshinak | ||
| CBJ service road | Apr 2, 2025 @ 11:52am Apr 2, 2025 | Variable | joshinak | ||
| Under Thunder | Mar 20, 2025 @ 4:25pm Mar 20, 2025 | Variable | joshinak | ||
| Connector | Aug 5, 2024 @ 2:19pm Aug 5, 2024 | Ideal | neebski | ||
| BTV | Dec 28, 2023 @ 2:51pm Dec 28, 2023 | Snow Packed | jmilz |
Activity Feed
| username | action | type | title | date |
|---|---|---|---|---|
| Brianb4sEA | difficultyvote | trail | activity #74301149 | Jun 21, 2025 @ 8:41pm Jun 21, 2025 |
| joshinak | add | report | activity #72740510 | May 30, 2025 @ 6:05pm May 30, 2025 |
| joshinak | add | report | activity #72666104 and 1 more | May 29, 2025 @ 3:40pm May 29, 2025 |
| AufcoB | ridden | trail | activity #71955328 and 3 more | May 18, 2025 @ 5:24pm May 18, 2025 |
| AufcoB | wishlist | trail | activity #71955311 and 1 more | May 18, 2025 @ 5:24pm May 18, 2025 |
Recent Comments
| username | type | title | comment | date |
|---|---|---|---|---|
| trail | Another great trail build by Gary Paasch,... | Aug 13, 2024 @ 9:25am Aug 13, 2024 | ||
| trail | Trail being developed, completion expected in... | Oct 19, 2022 @ 10:05am Oct 19, 2022 | ||
| trail | New trail nothing rideable yet… | Aug 9, 2022 @ 3:49pm Aug 9, 2022 | ||
| trail | Repaired Rollers on BTV | Jul 3, 2022 @ 7:25pm Jul 3, 2022 | ||
| trail | New Rollers at the bottom of Paydirt! | Jul 3, 2022 @ 7:21pm Jul 3, 2022 |
Nearby Areas
| name | distance | ||||
|---|---|---|---|---|---|
| Dredge Lakes | 11 | 24 | 1.5 km | ||
| West Glacier | 6 | 2 | 2.9 km | ||
| Ít'ji Shaánaxh, Silverbow Basin | 2 | 3 | 1 | 8.5 km | |
| Eaglecrest Ski Area | 3 | 3 | 2 | 8.5 km | |
| Douglas Island | 1 | 3 | 3 | 9 km |
Activity Type Stats
| activitytype | trails | distance | descent | descent distance | total vertical | rating | global rank | state rank | photos | reports | routes | ridelogs |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mountain Bike | 16 | 3 miles | 564 ft | 2 miles | 154 ft | #6,949 | #2,974 | 106 | 76 | 204 | ||
| E-Bike | 16 | 3 miles | 564 ft | 2 miles | 154 ft | #3,124 | #747 | 46 | ||||
| Hike | 10 | 1 mile | 177 ft | 2,959 ft | 128 ft | #4,931 | #2,381 | 63 | 7 | |||
| Trail Running | 10 | 1 mile | 177 ft | 2,959 ft | 128 ft | #4,937 | #2,383 | 2 | 65 | 6 |
- By Bstoody & contributors
- Admins: JMBA, JMBA
- #32405 - 5,169 views
- thunder mountain bike park activity log | embed map of Thunder Mountain Bike Park mountain bike trails | thunder mountain bike park mountain biking points of interest
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