The U.S. Fish and Wildlife Service has designated three rivers in Illinois and several in Missouri as “critical habitat” areas for endangered species that play an important role in water quality.
The federal agency announced April 24 it was designating roughly 3,814 river miles across 17 states critical habitat for four endangered freshwater mussel species: the rayed bean, sheepnose mussel, snuffbox mussel and spectaclecase mussel.
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