2.3 miles
Distance
111 ft
Climb
-108 ft
Descent
00:16:58
Avg time
Underground Loop Details
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Activities
- Mountain Bike
- Hike
- Trail Running
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Riding AreaThe Underground
Grand Rapids, Michigan -
Difficulty Rating
-
Trail TypeSingletrack
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Bike TypeXC, DJ
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DirectionOne Direction
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Climb DifficultyGreen
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Physical RatingModerate
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Trail VisibilityAlways easy to follow
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Dogs AllowedYes
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TTFs on TrailBerm, Drop, Jump, Gap Jump
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Local Popularity100 in Mountain Biking [+]
- 5 in Trail Running
- 80 in Hiking
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Land OwnerCity of Grand Rapids
No description for Underground Loop trail has been added yet!
Underground Loop is a 2 mile popular blue singletrack scenic trail located near Grand Rapids Michigan. This mountain bike primary trail can be used one direction and has a moderate overall physical rating with a 111 ft green climb. On average it takes 16 minutes to complete this trail.
Disclaimer
Current Map is not up to date
More Stats for Underground Loop mountain bike trail trail
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Altitude change3 ft
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Altitude min709 ft
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Altitude max763 ft
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Altitude start718 ft
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Altitude end722 ft
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Grade max-13.3%
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Grade min11.1%
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Distance climb2,900 ft
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Distance down3,701 ft
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Distance flat1 mile
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Avg time00:16:58
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Avg reverse time00:15:59
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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 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%
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- < 50%
- bi-directional trail
- no data
Trail Last Ridden
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- < 1 week
- < 2 weeks
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- < 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 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.
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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
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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.
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Directions to underground-loop trailhead
(42.921820, -85.633170)
update trails status or condition
Underground Loop Trail Reports
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Recent Ridelog Activity on Trail
Past Week
- 0 rides
6 Months
- 6 rides
- 9 miles avg distance
All
- 37 rides
- Last: Jan 20, 2025
Photos
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Routes with this trail
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Nearby Trails
- Triple Crown Of Egr Snow 4,767 ft
- Winter 2016-2017 Loop 1 mile
- 2017-2018 Winter Loop 1 mile
- Ken-o-sha North Loop 3 2 miles
- Connector 2 miles
- By WillieJacobsz
Trailforks Map Team & contributors - #604719 - 1,118 views
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