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.

Detailed Description
Dirty South is a 22 mile popular easy route located near Boulder Colorado. This mountain bike only route can be used both directions and has a moderate overall physical rating. This route includes 24 trails. This route climbs 1,627 ft with a max elevation of 6,241 ft then descends -1,628 ft.
Local Trail Association
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
    5,521 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
  • Snow Cover Inadequate
  • Freeze/thaw Cycle
  • Icy
  • Prevalent Mud
  • Wet
  • Variable
  • Ideal
  • Dry
  • Very Dry
Trail Flow (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%
  • bi-directional trail
  • no data
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
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Radar Time
x Activity Recordings
Trailforks users anonymized public ridelogs from the past 6 months.
  • mountain biking recent
  • mountain biking (>6 month)
  • hiking (1 year)
  • moto (1 year)
Activity Recordings
Trailforks users anonymized public skilogs from the past 12 months.
  • Downhill Ski
  • Backcountry Ski
  • Nordic Ski
Jump Magnitude Heatmap
Heatmap of where riders jump on trails. Zoom in to see individual jumps, click circles to view jump details.
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Recent Trail Reports Along Route

statustraildateconditiondescription
Coal Seam
May 14, 2022 @ 3:09pm
May 14, 2022
Coalton
May 14, 2022 @ 3:09pm
May 14, 2022
Marshall Valley
May 14, 2022 @ 3:09pm
May 14, 2022
Mayhoffer Singletree (City)
May 14, 2022 @ 3:09pm
May 14, 2022
Meadowlark Trail
May 14, 2022 @ 3:09pm
May 14, 2022
more reports »
  • By LucyJuice & contributors
  • #11994 - 1,538 views
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