This week, the Environmental Protection Agency is releasing a list of America’s Most Endangered Rivers. This week, word that seven area waterways are on their impaired list. That means they fail to meet a federal standard for water quality, even if some pollution controls are in place. It’s the Lake of the Ozarks Niangua Arm, the Lake of the Ozarks Osage Arm, Little Niangua River, Osage River, Richland Creek, Straight Fork and Lamine River.