22.5 miles
Distance
1,627 ft
Climb
-1,628 ft
Descent
1 mile
High Point

Links Dirty Bismark with Springbrook and trails west of 93. Many different lots to start from other than the Marshall Mesa parking lot... Or ride from South Boulder, Louisville, or Superior.

Local Trail Association
Boulder Mountainbike Alliance (bouldermountainbike.org)
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Details

More Stats for Dirty South mountain bike route
  • Altitude min
    5,521 ft
  • Altitude start
    5,568 ft
  • Altitude end
    5,568 ft
  • Grade
    -0%
  • Grade max
    -30.6%
  • Grade min
    31.7%
  • Distance climb
    11 miles
  • Distance down
    9 miles
  • Distance flat
    3 miles
Avg: 4 (2 votes)
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Trail Conditions
  • Unknown
  • Snow Groomed
  • Snow Packed
  • Snow Covered
  • Freeze/thaw Cycle
  • Icy
  • Prevalent Mud
  • Wet
  • Variable
  • Ideal
  • Dry
  • Very Dry
Trail Ridden Direction
Trailforks scans users ridelogs to determine the most popular direction each trail is ridden. A good flowing trail network will have most trails flowing in a single direction according to their intension.
The colour categories are based on what percentage of riders are riding a trail in its intended direction.
  • > 96%
  • > 90%
  • > 80%
  • > 70%
  • > 50%
  • < 50%
Trail Last Ridden
Trailforks scans ridelogs to determine the last time a trail was ridden.
  • < 2 days
  • < 1 week
  • < 2 weeks
  • < 1 month
  • < 6 months
  • > 6 months
Trail Ridden Direction
The intended direction a trail should be ridden.
  • Downhill Only
  • Downhill Primary
  • Both Directions
  • Uphill Primary
  • Uphill Only
  • One Direction
Contribute Details
Colors indicate trail is missing specified detail.
  • Description
  • Photos
  • Description & Photos
  • Videos
Trail Popularity ?
Trailforks scans ridelogs to determine which trails are ridden the most in the last 9 months. Trails are compared with nearby trails in the same city region with a possible 25 colour shades. Think of this as a heatmap, more rides = more kinetic energy = warmer colors.
  • most popular
  • popular
  • less popular
  • not popular
ATV/ORV/OHV Filter
Max Vehicle Width
inches

Radar Time
Trail transparency

Recent Trail Reports Along Route

statustraildateconditiondescription
Springbrook Connector
May 3, 2021 @ 6:43am
May 3, 2021
Trail Closed for Muddy Conditions reporter
Springbrook North
May 3, 2021 @ 6:43am
May 3, 2021
Trail Closed for Muddy Conditions reporter
Springbrook South
May 3, 2021 @ 6:43am
May 3, 2021
Trail Closed for Muddy Conditions reporter
Coal Seam
May 3, 2021 @ 6:43am
May 3, 2021
Trail Closed for Muddy Conditions reporter
Community Ditch - West
May 3, 2021 @ 6:43am
May 3, 2021
Trail Closed for Muddy Conditions reporter
more reports »
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