more stats
2.3 miles
Distance
110 ft
Climb
-107 ft
Descent
00:19:28
Avg time
3 ft
Altitude change
709 ft
Altitude min
763 ft
Altitude max
718 ft
Altitude start
722 ft
Altitude end
-11.5%
Grade max
11.1%
Grade min
2,900 ft
Distance climb
3,602 ft
Distance down
1 mile
Distance flat
00:19:28
Avg time

Underground Loop Details

  • Activities
    • Mountain Bike
    • Hike
    • Trail Running
  • Riding Area
    The Underground
    Grand Rapids, Michigan
  • Difficulty Rating
    Blue Rate
  • Local Popularity
    100 in Mountain Biking [+]
    • 65 in Trail Running
    • 5 in Hiking
  • Global Ranking
    #166845 in Mountain Biking [+]
    • #124931 in Trail Running
    • #298699 in Hiking
  • State Ranking
    #1,411 in Mountain Biking · Michigan [+]
    • #1,530 in Trail Running
    • #4,380 in Hiking
  • Trail Type
    Singletrack
  • Bike Type
    XC, DJ
  • Direction
    One Direction
  • Climb Difficulty
    Green
  • Physical Rating
    Moderate
  • Trail Visibility
    Always easy to follow
  • Dogs Allowed
    Yes
  • TTFs on Trail
    Berm, Drop, Jump, Gap Jump
  • Land Owner
    City of Grand Rapids

No community description for Underground Loop trail has been added yet!

AI Generated Description

Underground Loop is a 2 mile popular blue difficulty singletrack 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 110 ft green climb. It features berm, drop, jump and gap jump. Trail visibility is always easy to follow. On average it takes 19 minutes to complete this trail.

Disclaimer

Current Map is not up to date

Tags
BermsDropsJumps

Local Trail Association

Traditionally Indigenous Territory

Recent Activity on Trail

Past Week
  • 0 rides
  •  
6 Months
  • 29 rides
  • 9 miles avg distance
All
  • 139 rides
  • Last: Nov 1, 2026
c1c2c3c4
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Status:
on May 29, 2026
Dry
no votes yet
Your vote: 0

view (3,064)
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      Directions to underground-loop trailhead (42.921820, -85.633170)
      View on Discover Map

      Photos

      32 more »
      mtb
      719 |
      Apr 30, 2020 @ 7:34pm
      Apr 30, 2020
      mtb
      886 |
      Feb 29, 2004 @ 7:43pm
      Feb 29, 2004
      mtb
      226 |
      May 29, 2024 @ 6:49am
      May 29, 2024
      mtb
      209 |
      Mar 24, 2024 @ 5:09pm
      Mar 24, 2024
      Drops 3Jumps 2Skinnies 1Wooden features 1

      Videos

      5 more »
      youtuber Post Crash Anxiety & Just Sending It at...
      mtb
      20:05 | 505 | May 11, 2021 , Grand Rapids
      The Underground Loop
      mtb
      25:46 | 38 | Aug 2, 2026 , Grand Rapids
      youtuber Post Crash Anxiety & Just Sending It at...
      mtb
      20:05 | 672 | May 21, 2021 , Grand Rapids
      Underground jump lines
      mtb
      0:50 | 103 | Jul 9, 2024 , Grand Rapids

      Routes with this trail

      57
      EGR Trifecta Tour (Tue/Thu/Sat)
      21 miles • 858 ft • 11 • Loop •
      A relatively easy route linking Fred Bunn Trails @ Manhattan Park (EGR), The Underground (GR), and...

      Trail Events

      (1) past events on this trail

      1 Review & Comments

      WhatCouldPossiblyGoWrong
      Map is inaccurate and grading is completely dependent on trail section. All the way from green to some arguably double black lower peninsula trails. Ride with care and expect to figure it out yourself when you get there. I’ll try to add a better map to the photos soon once I finish my jump line and a friend of mine intends to add a map kiosk

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      Nearby Trails

      The Underground

      Frequently Asked Questions

      ▼ Where is Underground Loop located?
      Underground Loop is located in The Underground, Grand Rapids, Michigan, United States. It is part of the The Underground trail network. The trailhead is located at coordinates 42.92182, -85.63317.
      ▼ How hard is Underground Loop?
      Underground Loop is rated as Blue difficulty. The physical rating is Moderate. The climb difficulty is rated Green.
      ▼ What is the elevation gain for Underground Loop?
      Underground Loop has 110 ft of elevation gain. The trail has 107 ft of elevation descent. The elevation ranges from 709 ft to 763 ft.
      ▼ Is Underground Loop a point to point trail?
      Yes, Underground Loop is a point to point trail. The direction is One Direction. The trail type is singletrack.
      ▼ How long is Underground Loop?
      Underground Loop is 2.3 miles long. The trail type is singletrack.
      ▼ Are dogs allowed on Underground Loop?
      Yes, dogs are allowed on Underground Loop. Please keep dogs on a leash where required and clean up after them.
      ▼ When is the best time of year to ride Underground Loop?
      Based on activity log data, the most popular months to ride Underground Loop are:
      • May (18 activities)
      • July (15 activities)
      • June (9 activities)
      Check the reports page for current trail conditions.
      ▼ How do I access Underground Loop? Where is the closest parking trailhead?
      The closest parking and trailhead locations to Underground Loop are: View all parking locations in the area.
      ▼ How long does it take to ride Underground Loop?
      Based on recorded activities, it takes an average of 19 minutes to ride Underground Loop. The trail is 2.3 miles long. Actual times will vary based on fitness level, conditions, and pace. View recent activity logs for more details.
      ▼ How busy is Underground Loop?
      Underground Loop is a very popular trail. There have been 1,124 recorded activities on this trail. The trail has received 3,064 check-ins. View recent activity on this trail.

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