Towboats with fully loaded barges move through a canal near St. Louis that allows barge operators to circumvent an impassable section of the Mississippi River. Barge operators along a key stretch of the river braced Monday for months of restricted shipping while crews blast rock formations impeding navigation. (Coast Guard via Associated Press)

Towboats with fully loaded barges move through a canal near St. Louis that allows barge operators to circumvent an impassable section of the Mississippi River. Barge operators along a key stretch of the river braced Monday for months of restricted shipping while crews blast rock formations impeding navigation. (Coast Guard via Associated Press)