Stony Brook BranchStony Brook Branch is a tributary of the Stony Brook in Mercer County, New Jersey in the United States.CourseThe Stony Brook Branch starts at, in Sourland Mountain near Route 31 (Pennington Road). It flows east, crossing Route 31 and Pennington Hopewell Road before draining into the Stony Brook at.Sister tributariesBaldwins CreekDuck Pond RunHoney BranchLewis BrookPeters BrookWoodsville Brook