3,558 ft
Avg time

Grand Chasm Details

  • Riding Area
    Trowbridge Forest
    Thunder Bay, Ontario
  • Difficulty Rating
  • Trail Type
  • Bike Type
    AM, XC, Fat
  • Trail Usage
    Biking Only
  • Direction
    Downhill Primary
    Popular direction shown
  • Climb Difficulty
  • Physical Rating
  • Season
  • TTFs on Trail
    Berm, Bridge, Drop, Jump, Ladder Bridge, Rock Face
  • Ride in Rain
  • Global Ranking

Originally built in the the mid 90's the area around Grand Chasm has seen significant changes over the years and multiple lines developed as local riders looked to take advantage of the terrain and natural features around the heart of the old mines.

In 2011 the local mountain bike club, in consultation with IMBA representatives, started to redevelop and align the trails in order to improve flow, length and sustainability of the trail. After nearly 4 years of work the final produce was unveiled and a new 1.1km signature trail was opened in Shuniah Mines. Riders are now treated to a true flow trail with long sweeping sections, bermed corners, and plenty of optional tech features including; a ladder bridge, roll-able jumps and rock features. The new trail takes advantage of modern trail building techniques, while still maintaining the "old school" feel.

*New for 2016*
Due to the closures of old mine shafts in the area by the city of Thunder Bay, the top portion of Grand Chasm has required significant re-routing. Local builders with the support of the city have been given the opportunity to complete the first machine built section of trail in Shuniah Mines. Expected to open when work is completed in the spring of 2016, the new top portion of the trail will contain some of the largest XC features every constructed in the trail system.

Local Trail Association
More Stats for Grand Chasm bike trail
  • Altitude min
    899 ft
  • Altitude max
    900 ft
  • Altitude start
    900 ft
  • Altitude end
    900 ft
  • Grade max
  • Grade min
  • Avg time
  • Avg reverse time
  • view trail stats
on Nov 12, 2018
Snow Covered
Avg: 5 (3 votes)

view (1,100)
Layers winter
Trail Style
  • ?
Activity Type
Trail Conditions
  • Unknown
  • Snow Packed
  • Snow Covered
  • Freeze/thaw Cycle
  • Icy
  • Prevalent Mud
  • Wet
  • Variable
  • Dry
  • Very Dry
Directions to grand-chasm trailhead (48.476740, -89.206450)
update trails status or condition

Grand Chasm Trail Reports

Nov 12, 2018 @ 5:10am
Nov 12, 2018
reporter Lots of fresh snow! It's likely slow going.
Nov 9, 2018 @ 6:14am
Nov 9, 2018
reporter Freeze/Thaw (mostly freezing).. The weekend forecast is looking good for fat biking!
Sep 24, 2018 @ 5:25am
Sep 24, 2018
reporter Trails are soaked. Stay off them if you can.. If you must ride, then be nice to them!
Aug 29, 2018 @ 8:42am
Aug 29, 2018
reporter Some small wet sections after the weeks rain.
Jul 24, 2018 @ 8:16am
Jul 24, 2018
reporter Dusty dry and loose.
view all reports »


more »
2 |
Nov 2, 2018 @ 4:00pm
Nov 2, 2018
Grand Chasm, Timmins
2 |
Nov 2, 2018 @ 3:59pm
Nov 2, 2018
Grand Chasm, Timmins
52 |
Jan 27, 2018 @ 8:36am
Jan 27, 2018
Grand Chasm, Thunder Bay
86 |
Sep 19, 2017 @ 7:01am
Sep 19, 2017
Grand Chasm, Thunder Bay

Routes with this trail

Shuniah FORTY Miner race
7 miles

Reviews / Comments

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more »
Shuniah Mines Pretzel Trail
590 | Nov 6, 2014 , Thunder Bay
Fall-time in Shuniah
0:59 | 14 | Nov 2, 2018 , Thunder Bay
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