Name: Coal Seam
Rating: 3.7

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Dogs Leashed

E-Bikes Allowed

E-bikes allowed per regulation: bouldercolorado.gov/guide/g…

Description

A fun connector with an extremely rocky option, and a very easy walking path option. The trail heads south, paralleling 93, and works its way up to a connection with Community Ditch.

Contacts

Local Club: Boulder Mountainbike Alliance

Sep 29, 2026: Where Boulder’s 2026 Candidates Stand on Bike Issues

Sep 23, 2026: More Voices at the Table: BMA Supports Ballot Question 200

Sep 2, 2026: What Do You Want to Ask Boulder’s Candidates?

Land Manager: City of Boulder, Colorado - Parks and Recreation

Shared By:

Garrett Lodewyck with improvements by Austin Cowan

Full Details

Trail Ratings

3.7 from 14 votes

#2

in Marshall Mesa

#12113

Overall

3.7 from 14 votes

5 Star		7%
4 Star		57%
3 Star		36%
2 Star		0%
1 Star		0%

Trail Rankings

#2

in Marshall Mesa

#1,174

in Colorado

#12,113

Overall

2 Views Last Month

916 Since May 1, 2013

		7%
		14%
		71%
		7%
		0%
		0%

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Photos

Heading out from the trailhead, the smooth wide trail awaits - much like most of the DIrty Bismarck surface.

Mar 26, 2013 near Superior, CO

1 Comment

Weather

Current Trail Conditions

All Clear 3 days ago

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Check-Ins

Sep 20, 2024

Patrick Burns

If only this was downhill only and 3 miles long. Natural fucking awesome loose corners. A brief sample of perfect prairie MTB.

May 3, 2022

Loren D

Marshall Mesa trailhead open again!

Apr 3, 2022

Private User

Jul 12, 2020

Becky Lynn

May 14, 2019

Agustin Aguilera

Aug 14, 2018

William Horst

May 26, 2018

Cari Schnepp

Nov 13, 2016

Paige Schavey

Nov 1, 2016

Ryan Gross

Oct 31, 2016

Ryan Gross

Sep 19, 2016

Ryan Gross

Jul 10, 2016

Pat Grewe

Jun 28, 2016

Pat Grewe

Sep 17, 2015

Pat Grewe

Aug 9, 2015

Paul Billings

Jun 9, 2015

Jared Crockett

Fun little trail

Nearby Recommended Routes

Beautiful evening light and views of the Flatirons and Continental Divide from the Marshall Mesa trail in South Boulder.

Dirty Bismark

15.7 mi 25.2 km • 933' Up 284.36 m Up • 929' Down 283.21 m Down

Superior, CO

Down and Dirty

18.8 mi 30.3 km • 1,068' Up 325.44 m Up • 1,066' Down 324.88 m Down

Superior, CO

Rock Creek Farm Loop

11.8 mi 18.9 km • 301' Up 91.78 m Up • 305' Down 93.04 m Down

Broomfield, CO

Woman Creek Loop

6.9 mi 11.1 km • 490' Up 149.29 m Up • 490' Down 149.28 m Down

Superior, CO

North Boulder Loop

8.3 mi 13.4 km • 372' Up 113.47 m Up • 371' Down 113.22 m Down

Boulder, CO

White Ranch: Technical Descent Tour

13.6 mi 21.9 km • 2,799' Up 852.99 m Up • 2,800' Down 853.29 m Down

Golden, CO

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Coal Seam

“Super fun connector trail at Marshall Mesa trailhead. ”

0.6

0.9

5,718' 1,743 m

5,567' 1,697 m

151' 46 m

0' 0 m

5%

9%

Toolbox

Know This Trail?

Dogs Leashed

E-Bikes Allowed

Description

Contacts

Shared By:

Trail Ratings

#2

#12113

#2

#1,174

#12,113

Photos

1 Comment

Comment Type:

Weather

Current Trail Conditions

Check-Ins

Nearby Recommended Routes

Dirty Bismark

Down and Dirty

Rock Creek Farm Loop

Woman Creek Loop

North Boulder Loop

White Ranch: Technical Descent Tour

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