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Marathon Pipe Line LLC (MPL) is headquartered in Findlay, Ohio, and is a subsidiary of MPLX LP, a diversified, growth-oriented master limited partnership formed by Marathon Petroleum Corporation (MPC) to own, operate, develop and acquire midstream energy infrastructure assets. With over 110 years in the energy business, MPL is an industry leader of safely and reliably operating pipelines, storage tanks, and barge dock facilities.


  1. First Pipeline

    November, 1906

    Making its debut on Thanksgiving Day 1906, the first pipeline actually built by The Ohio Oil Company was eight inches in diameter and 191 miles long, running from Martinsville, Illinois, to Preble, Indiana, with a capacity of 34,000 barrels a day. By the end of 1906, Ohio Oil had linked 791 producing wells into a gathering system that was connected by pipeline to major refineries.

  2. President James Donnell


    When James Donnell became president of Ohio Oil in 1911, the company was the biggest crude producer in the Standard Oil group, with a 561 mile pipeline from the Mississippi River to the Ohio-Pennsylvania line and several gathering pipelines. This was the year that the Supreme Court broke up the Standard Oil trust, and Ohio Oil became a stand alone corporation once again.

  3. Illinois Pipe Line Company


    In reaction to the Supreme Court decision defining all pipelines as public carriers and subject to the authority of the Interstate Commerce Commission, Ohio Oil created the Illinois Pipe Line Company, spinning off the stock. It included 1,825 miles of eight and 10-inch pipelines, with a capacity of 70,000 barrels a day.

  4. Standard Oil Group


    Ohio Oil replaced threaded pipe installation with welded pipe installation.

  5. Telegraph Lines


    The original pipelines were paralleled by telegraph lines, which is how orders were communicated for regulating the flows from various tank farms. Telephones took over in 1923, followed by teletypewriters in the 1930s.

  6. Illinois Pipe Line Company Subsidiary


    Ohio Oil bought back the Illinois Pipe Line Company and made it a subsidiary. Where Ohio Oil went, the Illinois Pipe Line followed; it was the lifeline to market not only in the Midwest but also in Texas and Wyoming. Notably, Illinois Pipeline was one of the first companies to use storage tanks with floating tops in its tank farms.

  7. Illinois Pipe Line Company Dissolved


    With the exception of operations in Texas, the Illinois Pipe Line Company was dissolved and became part of Ohio Oil's Pipeline Department.

  8. Ohio Oil Unites


    Ohio Oil united with four other companies to construct a huge new crude line linking the Rocky Mountains with the Midwest. Ohio Oil was a 25 percent partner in the newly formed Platte Pipe Line Company, which had a capacity of 190,000 barrels a day.

  9. Microwave Transmission System


    Telegraphs and teletypewriters were replaced by a microwave transmission system to regulate the flow of pipelines.

  10. Marathon Pipe Line Company


    The Ohio Oil created Marathon Pipe Line Company, a subsidiary. At this time, the company controlled the 14th largest pipeline network in the United States with total traffic of 417,000 barrels of crude and 27,000 barrels of refined products, not including the Platte Pipe Line or a 75 percent interest in the Wabash Pipe Line Company, a refined products carrier between Wood River, Illinois, and the Chicago, Illinois, market.

  11. Sidrah Pipeline


    As one-third owner of The Oasis Oil Company at the time, Marathon Pipe Line engineers helped build the Sidrah Pipeline through Libya, facing extreme temperature fluctuations, shifting sands, and mines and unexploded ammunition left over from World War II.

  12. Pipeline Control Center - Findlay, Ohio


    The year that Ohio Oil Company became Marathon Oil Company, the new Pipeline Control Center was located in Findlay, Ohio. A single instrument panel controlled 1,500 miles of crude oil and products pipelines. Shortly thereafter, Marathon shifted those operations to three different pipeline control centers in: Martinsville, Illinois; Pasadena, Texas; and Casper, Wyoming.

  13. LOOP


    Marathon Pipe Line took a substantial equity interest in building the Louisiana Offshore Oil Port (LOOP) in the Gulf of Mexico, the first offshore oil port for supertankers.

  14. Consolidated Control Centers


    The Pipeline Control Centers were once again consolidated into one location in Findlay, Ohio.

  15. South Brae Platform


    Utilizing Marathon Pipe Line's technical expertise in another hostile environment, 74 miles of pipe were flawlessly laid in 55 days in 370 feet of water to connect Marathon's South Brae platform in the North Sea to an existing onshore pipeline.

  16. Cardinal Pipeline


    After a year of construction, Marathon Pipe Line began operating Cardinal Pipeline, a 150-mile long 14-inch pipeline connecting Kenova, West Virginia, with Columbus, Ohio.

  17. Celebrating 100 Years of Operation


    Marathon Pipe Line celebrated 100 years of pipeline operations.

  18. MPC and MPL Split from MOC


    Marathon Petroleum Corporation, with Marathon Pipe Line LLC as a wholly owned subsidiary, splits from Marathon Oil Company to form a new, independent downstream company.

  19. MPLX LP


    Oct. 26, 2012, Marathon Petroleum Corporation launched MPLX LP (NYSE: MPLX), a midstream master limited partnership. MPLX has 51 percent interest in a network of common carrier crude oil and products pipeline assets located in the Midwest and Gulf Coast regions through Marathon Pipe Line LLC and Ohio River Pipe Line and a 100 percent interest in a butane cavern in West Virginia.

  20. Markwest


    In 2015, MPLX merged with MarkWest, whereby MarkWest became a wholly owned subsidiary of MPLX. MarkWest is one of the largest processors of natural gas in the U.S. and the largest processor and fractionator in the Marcellus and Utica shale plays. The company's midstream energy operations include: natural gas gathering, processing and transportation; NGL gathering, transportation, fractionation, storage and marketing; and crude oil and refined products transportation and storage. Its integrated midstream energy asset network links producers of natural gas, natural gas liquids and crude oil from some of the largest supply basins in the United States to domestic and international markets.

  21. Cornerstone Pipeline


    Cornerstone Pipeline, a 42-mile, 16-inch pipeline from Cadiz, Ohio, to East Sparta, Ohio, with 180,000 barrels per day of capacity and an 8-mile, 8-inch pipeline from East Sparta to Canton, Ohio, with 45,000 barrels per day of capacity, began operation. MPL operates Cornerstone Pipeline from its operations center in Findlay, Ohio.


Our leadership is committed to achieving the company’s goals safely and efficiently, and bring decades of experience in the petroleum industry to their roles in determining our strategic and operational direction.

Shawn M. Lyon


Shawn M. Lyon


Mr. Lyon is the president of Marathon Pipe Line LLC. He is also vice president, operations of MPLX GP LCC. 

Mr. Lyon joined Marathon in 1989 as an engineer in Indianapolis, Indiana. While in Indianapolis, he worked in various positions in the Transportation and Logistics and the Marketing and Transportation Engineering organizations. In 1998, he began a series of engineering manager positions, providing engineering services for Marathon Petroleum’s marketing business in the Marketing and Transportation Engineering organization. In 2002, Mr. Lyon transferred to Findlay, Ohio, where he has held a variety of leadership positions. He was named the Product Quality manager in the Transportation and Logistics organization in 2005 and operations manager in Operations and Logistics for Marathon Pipe Line LLC in 2006. Mr. Lyon was named district manager in Transport and Rail for the Terminal, Transport and Marine business in 2008 and manager, Marketing and Transportation Engineering for Marathon Petroleum Company in 2010. He was named vice president of operations for Marathon Pipe Line LLC in 2011 and to his current position in 2018.

Mr. Lyon graduated from Purdue University with a Bachelor of Science degree in construction engineering in 1989. He received his professional engineering license in 1994.   

Mr. Lyon is the chairman of the pipeline industry’s implementation of the Pipeline Safety Management System (API RP 1173), a position he has held since 2015. He serves as president of the owner’s representative board for LOCAP pipeline and is on the Michigan Pipeline Safety Advisory Board where he was appointed by Governor Rick Snyder.

John C. Hunt

Vice President

John C. Hunt

Vice President

Mr. Hunt is vice president, operations of Marathon Pipe LLC (MPL).

He has more than 30 years of experience at Marathon Petroleum Corporation (MPC) and MPL. He has held various positions of increasing responsibility, including: area supervisor, North Big Horn Basin Area, MPL; project manager, Marketing and Transportation Engineering, MPC; project manager, Garyville major expansion, MPC; business project manager, CMMS/Frontier project, MPC; Houston Region manager, MPL; and manager, Marketing and Transportation Engineering, MPC. Mr. Hunt holds a BS degree in civil engineering from the University of Wyoming.