The couple, married for more than half a century, were later found dead, clinging to a tree and to each other.

The Wright County poll workers, 70 and 73, were swept off the road around 4:30 a.m. near Manes, Missouri. Three other riders caught in the flood ultimately survived.

Up to 8 inches (20 centimeters) of rain fell over two days in parts of Missouri, leading to widespread flooding and dozens of water rescues.