FILE - In this Dec. 3, 2009 file photo, crews search for Asian carp in the Chicago Sanitary and Ship Canal in Lockport, Ill. The Army Corps of Engineers is studying whether to separate the Great Lakes... more 
FILE - In this Dec. 3, 2009 file photo, crews search for Asian carp in the Chicago Sanitary and Ship Canal in Lockport, Ill. The Army Corps of Engineers is studying whether to separate the Great Lakes and Mississippi watersheds, which could include returing the Chicago River's original flow in an attemp to stop Asian carp and other invasive spiecies from traveling through the two basins. The flow of the river into the lake was reversed in the late 1800's to prevent pollution from reaching Lake Michigan. (AP Photo/M. Spencer Green, File) less 
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Associated Press | Photo By M. Spencer Green, File
Thu, Aug 18, 2011 4:32 PM EDT