Congress may close Mississippi River lock to slow spread of invasive carp

Asian carp fight
Equipment operator Kent Sandahl, right, helps tie down an Aggregate Industries barge filled with 2,400 tons of crushed limestone and sand Wednesday, April 4, 2012 along the Mississippi River in north Minneapolis. The materials were mined on Grey Cloud Island in St. Paul Park and then shipped upriver through the Upper St. Anthony Falls lock and dam. If the invasive Asian carp is found nearby in the river, a bill moving through Congress might close the lock and dam to river traffic.