Feds Release Michigan Oil Spill Investigation Documents

Federal officials have released photographs and 5,000 pages of documents related to the pipeline rupture in southwestern Michigan that polluted the Kalamazoo River and a tributary creek nearly two years ago.

The National Transportation Safety Board is investigating what caused the leak, which spilled more than 800,000 gallons of crude near Marshall in Calhoun County. Spokesman Peter Knudson said Monday the NTSB expects to reach a conclusion this summer.

The newly released material includes photos of the damaged pipe, reports outlining the sequence of events following the July 25, 2010 rupture and interviews with emergency responders and officials with Enbridge Inc., owner of the pipeline.

The 30-inch line extends from Griffith, Ind., to Sarnia, Ontario. Enbridge announced plans last week to enlarge the pipe so it can carry more oil.