3,864 ft
36 ft
-546 ft
Avg time
Trail Supporters, Builders & Maintainers of Upper Decker Trail

Upper Decker Details

  • Riding area
  • Difficulty rating
    Double Black Diamond
  • Trail type
  • Bike type
  • Trail Usage
    Biking Primary
  • Direction
    Downhill Only
  • Physical rating
  • Season
    April - November
  • eBike Allowed
  • Ride in rain
  • Global Ranking
  • Land Manager

Upper Decker runs along the ridgeline above Dump Gulch. It's an old-school fall-line trail and is very steep towards the end. There are several rugged rock outcrops along the trail up higher.

This is an unofficial trail that is not part of the inventoried South Hills network. Access and conditions are subject to change without notice.

Access Info

Take a right off of the Mount Helena Ridge Trail on to South Dump Gulch. You climb to a small knob, and from there it's all downhill. Don't follow South Dump to the left into Dump Gulch, and instead go straight following the ridge all the way down to Grizzly Gulch.

This trail is Unsanctioned, Ride at your own Risk!

More Stats for Upper Decker mountain bike trail
  • Altitude change
    -509 ft
  • Altitude min
    4,303 ft
  • Altitude max
    4,833 ft
  • Altitude start
    4,833 ft
  • Altitude end
    4,323 ft
  • Grade max
  • Grade min
  • Distance climb
    564 ft
  • Distance down
    3,182 ft
  • Distance flat
    118 ft
  • Avg time
  • view trail stats
on Dec 5, 2016
Snow Covered
Avg: 4.35 (3 votes)

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Map Style
Trail Style
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Directions to upper-decker trailhead (46.579630, -112.069910)
update trails status or condition

Upper Decker Trail Reports

Dec 5, 2016 @ 12:00pm
Dec 5, 2016
reporter 4+ inches of snow ends the 2016 dirt season.
Sep 27, 2016 @ 11:27am
Sep 27, 2016
Jun 21, 2016 @ 11:49am
Jun 21, 2016
reporter Sketchy dry as of 6/20.
May 21, 2016 @ 12:24pm
May 21, 2016
Nice and grippy for upper 3/4, bottom part has super sticky mud.
Apr 19, 2016 @ 8:17am
Apr 19, 2016
view all reports »


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1 Review & Comments

  • + 1
flag evasive MBG (Apr 8, 2016 at 9:26)
 Trail fairies have been laying logs and sticks across the trail this spring. Keep your eyes open and ride cautiously.

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