Should the government block all Great Lake waterways in an effort to prevent Asian carp from entering Lake Michigan?

The Army Corps of Engineers has determined that the most effective way of preventing Asian Carp from entering the Great Lakes is to construct an $18.4 Billion system of barriers around the lake's waterways. Opponents say that this project is too expensive and would hurt the region's economy by blocking barges from transporting goods. Proponents say that the carp is an invasive species and will destroy the lake's fish populations.