Oil pipeline repairs were completed in Chicago after major leaks and oil was expected to flow Friday.
Oil spills in recent weeks, from Canadian-owned pipelines that supply Midwest refineries, are another sign of nation's aging infrastructure. Latest spill expected to raise Midwest gas prices by 30 cents a gallon for several weeks.
Federal regulators had issued safety warnings about the condition of the pipeline in the Michigan oil spill that leaked nearly 1 million gallons of oil into the Kalamazoo River this week.
Michigan oil leak is not on the same scale as the BP oil spill in the Gulf of Mexico. But it is causing concern in southern Michigan.