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Watercress Darter National Wildlife Refuge is a 25-acre (100,000 m2) National Wildlife Refuge located in Jefferson County, Alabama, within the city limits of Bessemer. Watercress Darter NWR consists of a .25-acre (1,000 m2) pond known as Thomas Spring which is essential to the survival of the endangered watercress darter. A second pond was built on the site in 1983. The facility is unstaffed, but is administered by the Mountain Longleaf National Wildlife Refuge in Anniston, Alabama.

https://en.wikipedia.org/wiki/Watercress Darter National Wildlife Refuge