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 mountain 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 Jan 15, 2018
Snow Covered
Avg: 5 (2 votes)

view (667)
Layers winter
Trail Style
  • ?
Directions to grand-chasm trailhead (48.476740, -89.206450)
update trails status or condition

Grand Chasm Trail Reports

Jan 15, 2018 @ 7:33am
Jan 15, 2018
reporter About 15cm of fresh snow everywhere.
Dec 19, 2017 @ 8:27am
Dec 19, 2017
reporter 2 inches of fresh snow overnight. Lower tire pressures are a must.
Dec 18, 2017 @ 6:59am
Dec 18, 2017
Dec 11, 2017 @ 5:48am
Dec 11, 2017
reporter Cleared, packed and ready to ride.
Dec 5, 2017 @ 7:43am
Dec 5, 2017
reporter Lots of fresh snow! It's likely slow going.
view all reports »


more »
29 |
Sep 19, 2017 @ 7:01am
Sep 19, 2017
Grand Chasm, Thunder Bay
172 |
Jan 16, 2017 @ 5:19pm
Jan 16, 2017
Grand Chasm, Thunder Bay
225 |
Aug 9, 2016 @ 7:52am
Aug 9, 2016
Grand Chasm, Thunder Bay
193 |
Aug 9, 2016 @ 7:51am
Aug 9, 2016
Grand Chasm, Thunder Bay

Routes with this trail

Shuniah FORTY Miner race
7 miles

Reviews / Comments

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Shuniah Mines Pretzel Trail
447 | Nov 6, 2014 , Thunder Bay
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