Enbridge says a second oil pipeline beneath the Straits of Mackinac in northern Michigan has passed a pressure test required in a Justice Department agreement following a 2010 oil spill in southwestern Michigan.
The most recent test was Friday on one pipeline that's part of Line 5.
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The Canadian company pumped the line's east segment with water and kept pressure higher than usual. Enbridge said in a statement Sunday that it's "pleased with the validating results of this very significant test."
The west segment passed a pressure test earlier this month.
The pipelines where Lake Huron and Lake Michigan converge were built in 1953. Line 5 carries about 23 million gallons (19 million imperial gallons) of crude oil and liquid natural gas daily between Superior, Wisconsin, and Sarnia, Ontario.