The Brief On Sunday, law enforcement responded to a man going under the water after trying to swim across the Mississippi River. Police were unable to find the swimmer near Hidden Falls Regional Park in St. Paul. A swimmer’s body was recovered in the Mississippi River Monday, three days after law enforcement got reports of him going under and not resurfacing. Swimmer's body found in the Mississippi RiverAround 5 p.m. on Aug. 1, Ramsey County Sheriff’s Office said crews responded to a report near the 1300 block of Mississippi River Blvd. Law enforcement searched for the missing swimmer near Hidden Falls Regional Park, but were unable to locate him.