Des Moines Register: Runoff from livestock facilities and farm fields poses a "grave threat" to the Raccoon River, a major drinking water source for 500,000 Des Moines metro residents, placing it among the nation's 10 most-endangered waterways for 2021, a new report says. It's the first time the Raccoon River, which runs from northwest Iowa to Des Moines, has been placed on the annual Most Endangered Rivers list from American Rivers, an influential Washington, D.C., environmental advocacy nonprofit that has been producing the list since 1986. The Raccoon River ranked ninth. The group also placed the lower Missouri River, which forms Iowa's western border, second on the list.