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This loop has it all... singletrack, rock gardens, flowy sections, difficult ascents, great views and decent distance.

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6,103' 1,860 m


5,515' 1,681 m


1,068' 325 m


1,066' 325 m



Avg Grade (1°)


Max Grade (5°)

Dogs Unknown

E-Bikes Not Allowed

Features Views

FULL LOOP CLOSED. Coalton and Meadowlark trails are closed beginning October 9 through "early" 2024 for trail maintenance and cattle grazing. Learn more…


Awesome loop that will take you across all different types of terrain. I am a moderate rider and I find it to be heart pumping and also fun.

The Dirty Bismark is fun and this path adds a bit of a cool downhill section that leads to Walker Ranch, too. Five separate places to park and jump into this loop. There is even a bathroom roughly halfway through if you go the route I traced.

Need to Know

You can ride this on a gravel bike but probably more fun with fatter tires and better suspension. If this is your first attempt at riding, start elsewhere. Once you start this loop, turning back is less fun.


Starting at the parking lot (has bathroom) you go up a nice little hill that gets the blood flowing and kicks you into your climbing gears. From there, you peacefully ride towards the mountains before dropping down a steep descent with minor roots and little jumps. A hairpin turn and you drop into the valley.

The valley ride has some rocks gardens and mostly mild terrain following a little creek/river until you get to Spring Brook Loop fork (up the trail is additional parking and a bathroom). Continue on to Community Ditch and you'll get to ride some fun, flowy downhill sections through mostly singletrack flat terrain. Take that to 66th Street and the trail crosses over to continue a decent ride east until you hit an uphill section including some switchbacks. Follow that up until you come to a long straight section that includes a large steep ascent that, to be frank, sucks if you're not prepared for it in the middle of this long ride.

Once you're past the hill, you face many smaller rock gardens and flowy singletrack along the mild climb and falls adjacent to Highway 128. A jagged rock garden and tricky little trail is at the finish line before you cross back over Highway 93 to complete the loop.

History & Background

A section of this trail used to be a race circuit I think (the Dirty Bismark sections).


Shared By:

Kyle Simpson with improvements by Wendy Sweet

Trail Ratings

  4.0 from 22 votes


  4.0 from 22 votes
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in Colorado


87 Views Last Month
5,596 Since Apr 20, 2021



Beautiful evening light and views of the Flatirons and Continental Divide from the Marshall Mesa trail in South Boulder.
Nov 11, 2016 near Superior, CO
Dirty Bismarck heading towards the main parking lot.
Oct 18, 2015 near Superior, CO
Foothils sunset from the Community Ditch Trail
Apr 8, 2015 near Superior, CO
The intersection of Doudy Draw and the Spring Brook loops over looking the Boulder, CO flat irons.
Jun 24, 2016 near Superior, CO
Fast trail with beautiful views of the front range from the Community Ditch trail.
Oct 30, 2015 near Superior, CO
Small technical section on an otherwise fast trail. Beautiful views of the front range from the Dirty Bismarck.
Oct 30, 2015 near Superior, CO


Current Trail Conditions

Minor Issues 1 day ago
Add Your Check-In


Jun 10, 2023
Brent O'Neill
17.8mi — 2h 02m
Jun 2, 2023
Nolan Green
May 29, 2023
Jake Molzen
Sep 29, 2022
Alex Maybach
Aug 24, 2022
Bryan Allen
Decent amount of trail damage from the heavy rains this Aug. However, it's perfectly bikeable. 18.2mi — 1h 56m
Jul 23, 2022
Kevin Myers
First time around. Rocky downhill parts definitely tricky for me but overall great loop with some great uphill. — 1h 45m
Jul 22, 2022
Merced Gonzales
15mi — 3h 30m
Jul 4, 2022
Johanna Elizabeth
18.4mi — 2h 34m