Pipeline system description

The Mainline system consists of many interconnected lines: 

• Line 1 - an 18-to-20-inch-diameter crude oil and refined products pipeline, originating at Enbridge’s Edmonton Terminal in Edmonton, AB, and terminating at Enbridge’s Superior Terminal, in Superior, WI.  Length: 1,098 miles (1,767 km), Average annual capacity: 237,000 barrels per day

• Line 2A - a 24-inch-diameter crude oil pipeline, originating at Enbridge’s Edmonton Terminal near Edmonton, AB, and terminating at Enbridge’s Cromer Terminal near Cromer, MB. Combined, Line 2A and Line 2B form Line 2, which travels about 1,100 miles (1,770 km) from Edmonton to Superior, WI.  Length: 600 miles (966 km).  Average annual capacity: 442,000 barrels per day.

• Line 2B - a 24-to-26-inch-diameter crude oil pipeline, originating at Enbridge’s Cromer Terminal near Cromer, MB, and terminating at Enbridge’s Superior Terminal near Superior, WI. Combined, Line 2B and Line 2A form Enbridge's Line 2, which travels about 1,100 miles (1,770 km) from Edmonton, AB to Superior.  Length: 502 miles (808 km).  Average annual capacity: 442,000 barrels per day.

• Line 3 (3A/93) - a 34-to-36-inch-diameter crude oil pipeline, originating at Enbridge’s Edmonton Terminal near Edmonton, AB, and terminating at Enbridge’s Superior Terminal near Superior, WI.  In Canada, construction wrapped up on the Line 3 Replacement Program—spanning a 665-mile (1,070-km) portion of Line 3 between between Hardisty, Alberta and Gretna, Manitoba—in May 2019. The 36-inch-diameter replacement pipeline began commercial service in December 2019.  In the U.S., the US$4-billion replacement initiative, known as the Line 3 Replacement Project, consisted of replacing 34-inch pipe with new 36-inch pipe for 13 miles in North Dakota, 337 miles in Minnesota, and 14 miles in Wisconsin. Construction wrapped up in October 2021.  With project construction complete, the portion of the line from Hardisty, AB to Superior is now known as Line 93; the portion from Edmonton to Hardisty is known as Line 3A.  Length: Line 3A—106 miles (170 km); Line 93—1,068 miles (1,719 km); Total—1,174 miles (1,889 km).  Average annual capacity: Line 3A—390,000 barrels per day; Line 93—760,000 barrels per day.

• Line 4 - a 36-to-48-inch-diameter crude oil pipeline, originating at Enbridge’s Edmonton Terminal near Edmonton, AB, and terminating at Enbridge’s Superior Terminal near Superior, WI.  Length: 1,100 miles (1,770 km).  Average annual capacity: 796,000 barrels per day.

• Line 5 - a 30-inch-diameter light crude oil, light synthetic crude oil, and natural gas liquids (NGL) pipeline, originating at Enbridge’s Superior Terminal in Superior, WI, and terminating at Sarnia, ON.  Length: 645 miles (1,038 km).  Average annual capacity: 540,000 barrels per day.

• Line 6 - a 34-inch-diameter crude oil pipeline, originating at Enbridge’s Superior Terminal in Superior, WI, and terminating at Enbridge’s Griffith/Hartsdale Terminal near Griffith, IN.  Length: 465 miles (748 km).  Average annual capacity: 667,000 barrels per day

• Line 7 - a 20-inch-diameter crude oil pipeline, originating at Sarnia, ON, and terminating at Enbridge’s Westover Station near Hamilton, ON.  Length: 120 miles (193 km).  Average annual capacity: 180,000 barrels per day

• Line 8 - a 20-inch-diameter crude oil pipeline, originating at Sarnia, ON, and terminating at Mill Grove Junction near Hamilton, ON. Line 8 is currently leased to a third party that operates the line.  Length: 130 miles (210 km).

• Line 9 - a 30-inch-diameter crude oil pipeline, originating at Sarnia, ON, and terminating at Montreal, QC. The section known as Line 9A travels from Sarnia to Enbridge’s Westover Station near Hamilton, ON, while the section known as Line 9B travels from Westover Station to Montreal, QC.  Length: 517 miles (832 km).  Average annual capacity: 300,000 barrels per day

• Line 11 (Nanticoke) - a 16-to-20-inch-diameter crude oil pipeline, originating at Enbridge’s Westover Station, near Hamilton, ON, and terminating at Nanticoke, ON.  Length: 47 miles (76 km).  Average annual capacity: 117,000 barrels per day

• Line 14/64 - Line 14/64 is a 24-inch-diameter crude oil pipeline, originating at Enbridge’s Superior Terminal in Superior, WI, and terminating at Enbridge’s Griffith/Hartsdale Terminal near Griffith, IN.  Length: 487 miles (784 km).  Average annual capacity: 343,000 barrels per day

• Line 61 - a 42-inch-diameter crude oil pipeline, originating at Enbridge’s Superior Terminal in Superior, WI, and terminating at Enbridge’s Flanagan Terminal near Pontiac, IL.  Length: 462 miles (744 km).  Average annual capacity: 1,200,000 barrels per day

• Line 62 - a 22-inch-diameter crude oil pipeline, originating at Enbridge’s Griffith/Hartsdale Terminal near Griffith, IN, and terminating at Enbridge’s Flanagan Terminal, near Pontiac, IL.  Length: 75 miles (121 km).  Average annual capacity: 166,000 barrels per day

• Line 65 - a 20-inch-diameter crude oil pipeline, originating at Enbridge’s Cromer Terminal near Cromer, MB, and terminating at Enbridge’s Clearbrook Terminal near Clearbrook, MN.  Length: 313 miles (504 km).  Average annual capacity: 186,000 barrels per day

• Line 67 (Alberta Clipper) -  a 36-inch-diameter crude oil pipeline, originating at Enbridge’s Edmonton Terminal near Edmonton, AB, and terminating at Enbridge’s Superior Terminal near Superior, WI.  Length: 1,112 miles (1,790 km).  Average annual capacity: 800,000 barrels per day

• Line 78 - a 30-to-36-inch-diameter crude oil pipeline, originating at Enbridge’s Flanagan Terminal near Pontiac, IL, and terminating at Sarnia, ON. The 264-mile (425-km) portion that travels from Flanagan Terminal to Enbridge's Stockbridge Terminal near Stockbridge, MI is known as Line 78A; the 109-mile (175-km) portion traveling from Stockbridge to Sarnia is known as Line 78B.  Length: Line 78A—264 miles (425 km); Line 78B—109 miles (175 km); Total—373 miles (600 km).  Average annual capacity: Line 78A—570,000 barrels per day (36-inch diameter); Line 78B—500,000 barrels per day (30-to-36-inch diameter)

Major terminals:

• Edmonton

• Superior

• Cromer

• Hardisty

• Gretna

• Sarnia

• Griffith

• Westover

• Stockbridge

• Flanagan

• Nanticoke

• Mill Grove