The Oyster River is a 4.1-mile-long stream located in the state of Connecticut in New Haven County. It flows south through Orange and forms the boundary of West Haven and Orange and flows through Yale University's West Campus. Further downstream, it forms the boundary of West Haven and Milford. It empties into Long Island Sound, just sout…The Oyster River is a 4.1-mile-long stream located in the state of Connecticut in New Haven County. It flows south through Orange and forms the boundary of West Haven and Orange and flows through Yale University's West Campus. Further downstream, it forms the boundary of West Haven and Milford. It empties into Long Island Sound, just south of Route 162 at Oyster River Point. Swans, box turtles and many other animals call this area home.