How to Waste a Shitload of Money

$18 billion would keep Asian carp out of Great Lakes. (USA Today, 1/6/2014)

That's the most expensive and time-consuming option.  The options range from taking no new action — a suggestion Stabenow and Camp rejected out of hand — to those creating a physical separation at the edge of Lake Michigan, which the Corps estimates would take 25 years to complete and cost as much as $18 billion in its most drastic form. It also would cause the greatest cost impact on commercial cargo.

The Asian carp species, it appears, is on a much different timetable.  In fact, there are some reports that it has already found its way into the Great Lakes.

U.S. Fish & Wildlife Service.  Region 3 -- Great Lakes/Big Rivers.
Asian Carp -Aquatic Invasive Species Issues, Program Accomplishments, and Program Needs.