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

Upper Decker Details

  • Riding Area
    South Hills
    Helena, Montana
  • Difficulty Rating
  • Trail Type
  • Bike Type
  • Trail Usage
    Biking Primary
  • Direction
    Downhill Only
    Popular direction shown
  • 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!


West Main Street is closed to bikes until fall due to construction. Riders descending Upper Decker will need to climb back out of Grizzly Gulch.

More Stats for Upper Decker 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 Oct 25, 2018
Avg: 3.65 (6 votes)

view (123)
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 upper-decker trailhead (46.579630, -112.069910)
update trails status or condition

Upper Decker Trail Reports

Oct 25, 2018 @ 12:04pm
Oct 25, 2018
May 16, 2018 @ 7:01am
May 16, 2018
Apr 29, 2018 @ 11:51am
Apr 29, 2018
Nov 25, 2017 @ 1:10pm
Nov 25, 2017
reporter Fantastic conditions! Perfect amount of moisture in the soil.
Nov 1, 2017 @ 11:24am
Nov 1, 2017
reporter First real snowfall of 2017/18
view all reports »


more »
7 |
Sep 24, 2018 @ 6:50am
Sep 24, 2018
Upper Decker, Helena

2 Reviews & 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.
  • + 1
flag lyophilization (Apr 17, 2017 at 15:28)
 This trail is pretty awful. Who ever built it couldn't decide between a gnarly fall line trail and a curvy trail, and the result is fast downhills followed by curves. Skip this trail and keep riding down South Dump Gulch trail.

Post a Comment

You must login to Pinkbike.
Don't have an account? Sign up

Join Pinkbike  Login


no videos have been added for Upper Decker yet, add a video.