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He recounted a case he worked in the 1990s, when a man was found savagely beaten to death by the banks of the Anacostia River.

Sometimes called D.C.’s “forgotten river,” the Anacostia River is shorter, shallower and harder to navigate than the more famous Potomac, which cuts through the city’s storied landmarks and is steeped in Revolutionary and American Civil War history.

The Anacostia River Watershed tested the river for fecal bacteria, dissolved oxygen — needed by all aquatic animals — and algae levels, as well as the health of its aquatic vegetation and clarity of its water.

“The trend line is moving up,” said Chris Williams, director of the Anacostia River Watershed.

Virgil Roberts, an African American man from Ward 7, east of the Anacostia River, said he voted for Donald Trump because “he’s not leftist.”