Potomac River from airplaneThe Potomac River, once so polluted it was labeled a “national disgrace,” is now the cleanest it has been in decades – its comeback signaled by the re-growth of large areas of underwater grasses.

A new scientific study, released Tuesday, paints an evocative picture of the Potomac’s rebound from the 1960s, when its bottom was bare mud and its algae-choked water was AstroTurf green.

Today, the river is clearer and heavily carpeted with grass. Scientists found that the Potomac’s critical grass beds had doubled in size since 1990.

(READ the story in the Washington Post)

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