MINNEAPOLIS (AP) — A state-commissioned study says a barrier of sound, bubbles and lights would be the most viable option to keep Asian carp from moving up the Mississippi River from downtown Minneapolis.

But the price of the barrier at Lock and Dam No. 1 would be high. The report says the estimated construction cost is $12 million, and could go as high as $19 million. And it would cost up to $250,000 a year to operate and maintain.