"We know these barriers aren't working," said Joel Brammeier, president of the Alliance for the Great Lakes and the lead author of a 2008 report that laid out how this project might look. "An ecological separation is the only permanent solution."

Six Great Lakes states and the Canadian province of Ontario have petitioned the U.S. Supreme Court to separate the water basins in a last-ditch effort to prevent the Asian carp from decimating the $7 billion Great Lakes fishing industry. The Army Corps of Engineers has launched a $10 million, five-year feasibility study of the idea. And the plan became the focus of a hearing on the Asian carp problem on Capitol Hill last week.