22 miles
Distance
1,920 ft
Climb
-1,920 ft
Descent
1 miles
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)
Please consider joining or donating to the local riding association to support trail development & maintenance.
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Details

More Stats for Dirty South mountain bike route
  • Altitude min
    5,513 ft
  • Altitude start
    5,566 ft
  • Altitude end
    5,566 ft
  • Grade max
    -18.008%
  • Grade min
    20.208%
  • Distance climb
    11 miles
  • Distance down
    9 miles
  • Distance flat
    2 miles
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Trail Conditions
  • Unknown
  • Snow Groomed
  • Snow Packed
  • Snow Covered
  • Freeze/thaw Cycle
  • Icy
  • Prevalent Mud
  • Wet
  • Variable
  • 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 intendid direction a trail should be ridden.
  • Downhill Only
  • Downhill Primary
  • Both Directions
  • Uphill Primary
  • Uphill Only
  • One Direction
ContributeDetails
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

LEGEND
Trail Difficulties
  • Access Road/Trail
  • White
  • Green
  • Blue
  • Black
  • Double Black Diamond

Trail Report Status
  • Clear / Green
  • Minor Issue / Yellow
  • Significant Issue / Amber
  • Closed

  • Land Owner Overlay
  • Wilderness (typically no bikes in USA)
  • BLM (public)
  • USFS (Wildlife sanctuaries darker than usfs)
  • State land
  • Indigenous
  • Military
Trail Conditions
  • Unknown
  • Snow Groomed
  • Snow Packed
  • Snow Covered
  • Freeze/thaw Cycle
  • Icy
  • Prevalent Mud
  • Wet
  • Variable
  • Dry
  • Very Dry
  • Map Markers
  • trail Trail Head
  • photo Photo
  • place Directory Listing
  • region Riding Area
  • TTF TTF
  • Parking Parking
  • Viewpoint Viewpoint
  • Information Information
  • Warning Warning
  • Directions Directions
  • Water Fountain/Source Water Fountain/Source
  • Sight Sight
  • Restrooms Restrooms
  • Gate Gate
  • Camping Camping
  • Trail Sign Trail Sign
  • Table or Bench Table or Bench
  • Table or Bench eBike Charging Point
  • Other Other
      Trail transparency

      Recent Trail Reports Along Route

      statustraildateconditiondescription
      Springbrook South
      Apr 17, 2019 @ 4:26pm
      Apr 17, 2019
      A couple of tiny puddles reporter
      Doudy Draw
      Apr 17, 2019 @ 4:26pm
      Apr 17, 2019
      Completely dry reporter
      Flatirons Vista Rd
      Apr 17, 2019 @ 4:26pm
      Apr 17, 2019
      Completely dry reporter
      Springbrook Connector
      Apr 17, 2019 @ 4:26pm
      Apr 17, 2019
      A couple of tiny puddles reporter
      Springbrook North
      Apr 17, 2019 @ 4:26pm
      Apr 17, 2019
      A couple of tiny puddles reporter
      more reports »
      • flag
      • login to download gpx or kml files.