access:free, ssts:news:nation, sstsn:national news, tag:accidents & disasters, tag:chemicals industry, tag:civil engineering, tag:construction & maintenance, tag:ecology & environment, tag:energy & utilities, tag:green living & environmental issues, tag:iowa department of natural resources , tag:local news, tag:minnesota department of transportation, tag:mississippi river, tag:overall neutral, tag:tourist destinations, tag:u.s. congress, tag:u.s. fish and wildlife service, tag:university of missouri, type:story