Dirty Bismarck Loop Trail is a 13.8 mile moderately trafficked loop trail located near Louisville, Colorado that features beautiful wild flowers and is rated as moderate. The trail offers a number of activity options and is best used from March until October. Dogs and horses are also able to use this trail.

Length13.8 miElevation gain902 ftRoute typeLoop
dog friendlyCross-country skiingHikingHorseback ridingMountain bikingNature tripsWalkingBird watchingrunningForestViewsWildflowersWildlife
Description
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This mountain bike version of the famous Morgul-Bismarck bike race course, is a great loop trail near Superior, Colorado Also known as the "Happy Meal Loop," the Bismarck Dirty Loop was completed in 2011 with the addition of the Meadowlark Trail section. This trail is easily accessible by Colorado Front Range trail users and is an especially enjoyable mountain bike trail. Although challenging in a couple short sections, in general the Bismarck Dirty Loop is not a very difficult trail for mountain bikers or hikers. Other than a couple low-traffic dirt road crossings, the trail is very safe and road-free. This loop trail is good for hiking, mountain biking, horseback riding, and trail running. Portions of it are also excellent for cross-country skiing.

- You will definitely want a mountain bike for this trail. Road bikes, recumbents, and Trikkes would not perform well on this trail. -Weekdays provide great experiences on this trail. Weekends can get a little busy, but not too bad. - Keep your speed in check and use your front brakes in moderation on the couple steep portions of this trail. - This trail is easily accessible from Boulder, Superior, and Louisville, Colorado. - If you are accessing this trail from Denver or the airport, there is an RTD Park-n-Ride at McCaslin Boulevard and hwy. 36. This Park-n-Ride is very close to the trailhead in Old Town Superior. - If you are coming from Louisville, CO, the Coal Creek Trail ties into the Dirty Bismarck Loop in Old Town Superior. (You will cross under hwy. 36 and McCaslin Blvd. - Dogs are commonly seen walking their humans on these trails, but they must keep a leash attached to their human's hand at all times.

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Reviews (225)
Photos (390)
Recordings (245)
Completed (379)
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Chris Harvey
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarJanuary 21, 2021
Mountain biking
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Nam Luu
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarJanuary 17, 2021
Mountain bikingGreat!

Rode the MTB on 1/16. 99.5% dry. it's gtg!

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Jeffrey Saless
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarDecember 28, 2020
Hiking

Good conditions over all just a little ice here and there.

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Derek Hingeveld
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarDecember 25, 2020
Hiking

Perfect.

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Thomas Persson
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarGray StarGray StarDecember 21, 2020
Mountain biking

Well maybe half of the trail was dry, the rest was muddy and/or snow covered.

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Annette gallmeyer
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarDecember 5, 2020
Hiking
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Rodrigo Galvan
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarNovember 18, 2020
Mountain biking

Nice beginner to intermediate trail, little bit of everything, just don't pick a windy day, takes around 2 hours to complete

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Jason Antonacci
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarNovember 16, 2020
HikingMuddyNo shade

Super windy on the high plains in November, bring a wind breaker or a hard shell in addition to a light/med middle layer over your base. Terrain ranges from packed or gravel roads to single track. Elevation change is under 1K, bit total change is closer to 3K when you are done.

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Emma Westerhoff
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarNovember 8, 2020
Mountain biking
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Derek Hingeveld
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarNovember 8, 2020
Hiking

A beautiful morning.

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Derek Hingeveld
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarNovember 5, 2020
Hiking

You are an unbreakable force.

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Andy Winn
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarNovember 2, 2020
Mountain bikingGreat!No shadeRocky

This ride rewards the initial climbing with lots of variety during flowy descents. Loose rocky sections followed by gravely hardpack, followed by about a quarter mile of fun rock garden goodness lead to a brisk climb and that's just the first half. The Community Ditch section offers beautiful views of the Flat Irons. From there, you'll enjoy plenty of fast and flowy sections with a grind of a climb out of Superior that treats you to a quick descent back to the car. This is a great ride with a little of everything for everyone. Highly recommended!

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Derek Hingeveld
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarOctober 24, 2020
Hiking

‘‘Twas fun”

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Derek Hingeveld
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarOctober 18, 2020
Hiking

Foggy

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Derek Hingeveld
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarOctober 15, 2020
Hiking

Got dark early.

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Jason Gov
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Hiking

very long and tiring.

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Dane Miller
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Hiking
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John May
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Mountain bikingGreat!

North side was very nice!

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Tyson O'Donnell
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Backpacking
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Leonardo KIM
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Mountain biking
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Tyson O'Donnell
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Backpacking
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Derek Hingeveld
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Running

The trail was great fun! Just remember, two is one, one is none.

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Brie Stahl
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarAugust 16, 2020
Hiking

It was a gorgeous beginner bike! Tons of rock and gravel so be careful on your turns. I fell and got banged up. But it was a nice trail! The smoke from the wild fires is definitely noticeable on this trail.

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Mike Zimmerman
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarJuly 28, 2020
Mountain bikingBugsGreat!

Rode the loop clockwise. I think going counter would be more challenging. Fantastic views, varying terrain and challenges on the bike. A bit rocky on the southwest portion, but fun nonetheless. Fresh cowpies! Be nice to the cows. Don't ride by them too fast. They can spook.

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Ashley Stanford
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarJuly 26, 2020
Mountain bikingGreat!No shadeRocky

excellent ride! the few areas of decent sized rocks were super fun too! no shade but today was really overcast which made it perfect to ride

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