Enbridge Mainline Oil Pipeline System
The Enbridge Mainline system is Canada’s largest transporter of crude oil, moving Western Canadian crude oil production to markets in eastern Canada and the U.S. Midwest. The Mainline also transports refined petroleum products to Saskatchewan and Manitoba and natural gas liquids to Sarnia, Ontario. The first leg of the Mainline from Edmonton, Alberta to Superior, Wisconsin was built in 1950. In 1953 it was extended to Sarnia, Ontario. The Mainline has been expanded and upgraded during the last thirty years to its current configuration and capacity.
The Mainline originates in Edmonton, Alberta and extends east across the Prairies. It receives western Canadian and U.S. crude oil from feeder pipelines at Edmonton and Hardisty in Alberta, Kerrobert and Regina in Saskatchewan, and Cromer in Manitoba. The pipeline crosses the Canada-U.S. border near Gretna, Manitoba, where it joins with the Enbridge Lakehead system.
At Clearbrook, Minnesota, the Mainline receives U.S. crude oil from the Enbridge North Dakota pipeline and connects with the Minnesota Pipe Line that can deliver crude oil to refineries in Minnesota and Wood River, Illinois.
At Superior, Wisconsin the Mainline branches in two segments. The northern pipeline passes through northern Wisconsin and Michigan before crossing into Ontario at Sarnia. The southern leg contours south of Lake Michigan to Lockport and Chicago in Illinois before turning northeast passing though Indiana and Michigan. It re-enters Canada at Sarnia, Ontario.
At Sarnia, the Mainline connects with Line 9 and Line 7, which deliver crude oil to Montreal, Quebec; Nanticoke, Ontario and Warren, Pennsylvania. There is also a lateral pipeline connecting Sarnia to the Mid-Valley pipeline system, which delivers crude oil to refineries in Michigan and Ohio before connecting to a pipeline hub in Texas.
Two laterals (Lines 17 and 79) from Stockbridge, Michigan link the Mainline to refineries in Toledo, Ohio. At Chicago and Flanagan, Illinois, the Mainline links with the Southern Access Extension Pipeline (SAX), Mustang, Spearhead, Flanagan South and Chicap pipelines to deliver crude oil to pipelines and refining hubs at Patoka, Illinois and Cushing, Oklahoma.
https://www.cer-rec.gc.ca/nrg/ntgrtd/pplnprtl/pplnprfls/crdl/nbrdgmnln-eng.html
