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1,421 ft
Distance
18 ft
Climb
-108 ft
Descent
1 mile
High Point
-90 ft
Altitude change
7,554 ft
Altitude min
7,643 ft
Altitude start
7,552 ft
Altitude end
-6.3%
Grade
-20.3%
Grade max
21.7%
Grade min
125 ft
Distance climb
1,135 ft
Distance down
161 ft
Distance flat
Undertow (Section 4) Details
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Activities
- Mountain Bike
- Adaptive Bike
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Riding AreaDeer Valley Resort
Park City, Utah -
Difficulty Rating
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Voted DifficultyBlue (2 votes)
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Local Popularity85 in Mountain Biking [+]
- 5 in Adaptive Biking
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Global Ranking
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State Ranking
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Trail TypeMachine Groomed
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Bike TypeDH, AM, Adaptive MTB
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Physical RatingModerate
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Trail VisibilityAlways easy to follow
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eBike Allowed
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TTFs on TrailBerm, Roller Coaster
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Land OwnerDeer Valley Resort
No community description for Undertow (Section 4) trail has been added yet!
AI Generated Description
Undertow (Section 4) is a 1,421 ft popular black diamond difficulty machine groomed trail located near Park City Utah. This mountain bike primary trail and has a moderate overall physical rating. It features berm and roller coaster. Adaptive MTB rating: amtb black. Trail visibility is always easy to follow.
Adaptive Bike Info
aMTB Black Rating: Advanced obstacles exist, some trail obstructions.
36 to 42 inches wide. Some fun twisties in this section, no technical obstacles.
Bike Park
Local Trail Association
-
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Please consider joining or donating to the local trail association to support
trail development & maintenance.
Traditionally Indigenous Territory
Recent Activity on Trail
Past Week
- 4 rides
- 14 miles average
6 Months
- 403 rides
- 21 miles avg distance
All
- 682 rides
- Last: Sep 30, 2026
Undertow (Section 4) 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
Colors indicate trail is missing specified detail.
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- 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.
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- popular
- less popular
- not popular
ATV/ORV/OHV Filter
Max Vehicle Width
inches
US Cell Coverage
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Radar Time
Activity Recordings
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Activity Recordings
Trailforks uses anonymized public activity data.
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Winter Trails
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Missing Trails
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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
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Directions to undertow-section-4 trailhead
(40.634680, -111.476010)
Photos
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Nearby Trails
- Regulator (section 4) 69 ft
- Ripple (section 5) 472 ft
- Undertow (section 5) 686 ft
- St Regis 1,027 ft
- Ripple (section 4) 1,073 ft
- By blgtymert
& contributors - #787810 - 282 views
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