“Mother’s Day hike in Dumbarton Oaks Park with Amaryllis, Bobby, Kick, and Jackson, and a swim with my grandchildren, Bobcat and Cassius in Rock Creek,” Kennedy wrote in a post on X alongside photos i...

Dumbarton Oaks Park is downstream from Piney Branch, a tributary of Rock Creek that receives about 40 million gallons of untreated sewage and stormwater overflow each year, according to the D.C. Water...

Health and Human Services Secretary Robert F. Kennedy Jr. swam in Rock Creek with his grandkids on Mother's Day – which the National Park Service forbids due to high bacteria levels.