Carters Brook (New Jersey)Carters Brook, also known as Carter Brook, is a branch of the Heathcote Brook in Somerset and Middlesex counties, New Jersey in the United States.CourseThe Carters Brook source is at, near the intersection of Route 518 and Route 27. It flows generally south, crossing Promenade Boulevard and Raymond Road before draining into the Heathcote Brook at.AccessibilityThe Carters Brook is accessible by several roads.Sister tributaryHeathcote Brook Branch