Congress is expected to vote shortly to order federal engineers to speed up a study of how to keep the Asian carp from invading the Great Lakes. The measure requires the U.S. Army Corps of Engineers to produce a plan for preventing species migrations between the lakes and the Mississippi River watershed within 18 months. The provision was attached to a highway spending bill. The Obama administration has pledged to produce a list of options by the end of 2013. But the measure requires a more detailed plan for blocking invasions at 18 locations. Ohio is one of several states suing the government to speed up efforts to block the carp from reaching the lakes.