A hand holding a white safety helmet with the red and blue Marathon logo

Safe and Reliable Operations

At Marathon Pipe Line LLC (MPL), our vast network of pipelines, storage tanks and caverns, and marine facilities plays a critical role in connecting energy resources to refineries, terminals, and, ultimately, to the communities that rely on them.

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Understanding Our Operations

MPL safely transports and stores crude oil, refined products, and natural gas throughout the continental United States and Alaska. We continuously meet or exceed state and federal regulatory requirements. By following our integrity management protocol, performing right-of-way inspections, using 24/7 computer monitoring in our operations centers, and conducting ongoing emergency preparedness and response training, we dedicate ourselves to the safety of the public and the environment on a daily basis.

Wood River Pipeline Terminal

Pipelines

We safely operate thousands of miles of underground pipelines. Our pipeline networks are designed to allow us to meet market needs safely and reliably.

Where We Operate

We share nearly 10,000 miles of pipeline rights of way with communities across the United States. To learn more about the pipelines we operate and the products they transport, use the search function or zoom controls on our interactive map. Click any red line to view detailed information.

Explore Our Pipeline Operations

Accept User Terms for Map

Pipeline information provided from MPL's Geographic Information System, 2025. Street map information provided by Google. MPL is providing this map as a courtesy and for general information purposes only. It does not represent that the information contained herein is accurate for any particular purpose, and therefore disclaims all warranties, expressed or implied, including the warranty of fitness for a particular purpose. Independent verification from experts should be obtained prior to any specific use. Recipient accepts full responsibility for any consequences associated with use of this information. This information does not replace calling 811 before digging. As such, you are still required to call 811 before digging.

Pipeline Finder App

With the Pipeline Finder App, you can easily locate MPL-operated pipelines, access essential safety guidelines, and find emergency contacts. 

Get Our Pipeline Finder App

A black button with the Apple logo and CTA to download the MPL Finder app on the App Store      A black button with the Google Play logo and CTA to download the MPL Finder app for Google Play

A picture of a the MPL Pipeline Finder App on a smart phone screen

A Marathon Pipe Line technician welding a cracked pipeline pipe
Integrity Management
A Marathon Pipe Line operator working at a large data console at an Operation Center
Operations Centers
A red Marathon spill response vehicle with a trailer attached
Emergency Preparedness
An aerial view of countryside from an airplane wing
Right-of-Way Inspections
The Patoka pipeline terminal at sunset

Storage Tanks

We operate or provide oversight at four separate active liquefied petroleum gas (LPG) storage cavern facilities. Underground storage in caverns provides a safe method to store large volumes of LPG.

A Marathon Pipe Line operator walking down into storage cavern

Storage Caverns

We operate or provide oversight at four separate active liquefied petroleum gas (LPG) storage cavern facilities. Underground storage in caverns provides a safe method to store large volumes of LPG.


  • Woodhaven, MI
    • 8 LPG storage caverns
      • Salt cavern
      • 1,000' below grade
    • Butane and propane storage

  • Canton, OH
    • 1 LPG storage cavern
      • Salt cavern
      • 3,400' below grade
    • Butane storage

  • Neal, WV
    • 2 LPG storage caverns
      • Hard rock caverns
      • 450 ft below grade
    • Butane and propane storage

  • Robinson, IL
    • 1 LPG storage cavern
      • Hard rock caverns
      • 650' below grade
    • Butane storage
Large tanker ship docked at an industrial port during sunset, with the sun reflecting on the water and a wooden pier in the foreground

Marine Facilities

On the Mississippi River, we operate a marine facility with barge capabilities at Wood River, Illinois, enabling crude oil transport to the Gulf Coast for refining. In Los Angeles, our three marine terminals supply crude oil, refined products, renewable diesel, and other intermediates to Southern California. Two of these terminals load products for domestic and international distribution, with one offering “cold-ironing” capabilities for vessels to connect to shoreside power while docked.

Capline Pipeline

Proudly operated by MPL, Capline has been a critical part of America's energy infrastructure since 1968. As the energy landscape has changed over the past decade, Capline is now positioning itself for the next iteration of crude oil movements.

Keep Up with Capline

The blue Capline Pipeline logo

Working Together

We're committed to earning your trust, delivering timely information and maintaining open communications. Let us answer your pipeline safety questions.

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