FILE - This Dec. 1, 2009 file photo, shows the downtown Chicago Lock at the foot of the Chicago river through which river traffic passes into Lake Michigan. The flow of the river into the lake was reversed in the late 1800's to prevent pollution from reaching Lake Michigan. The Army Corps of Engineers is studying weather to separate the Great Lakes and Mississippi watersheds, which could include returning the rivers original flow in an attempt to stop Asian carp and other invasive species from traveling through the two basins. (AP Photo/M. Spencer Green File)

Associated Press
FILE - This Dec. 1, 2009 file photo, shows the downtown Chicago Lock at the foot of the Chicago river through which river traffic passes into Lake Michigan. The flow of the river into the lake was reversed  in the late 1800's to prevent pollution from reaching Lake Michigan. The Army Corps of Engineers  is studying weather to separate the Great Lakes and Mississippi watersheds, which could include returning the rivers original  flow in an attempt to stop Asian carp and other invasive species from traveling through the two basins. (AP Photo/M. Spencer Green File)
FILE - This Dec. 1, 2009 file photo, shows the downtown Chicago Lock at the foot of the Chicago river through which river traffic passes into Lake Michigan. The flow of the river into the lake was reversed in the late 1800's to prevent pollution from reaching Lake Michigan. The Army Corps of Engineers is studying weather to separate the Great Lakes and Mississippi watersheds, which could include returning the rivers original flow in an attempt to stop Asian carp and other invasive species from traveling through the two basins. (AP Photo/M. Spencer Green File)
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