The U.S. Coast Guard will be producing their report by 2015, in which they will outline these options: how they would go about producing a permanent barrier, as well as any other options they have been able to come up with. Until that time, the U.S. will continue to have to spend $51.5 million per year to kill off as many of the Asian carp as they can in the rivers leading up to Lake Michigan.
On April 30th, 2012. See this statement in context.