The Mill River is a long tributary of the Connecticut River in Springfield, Massachusetts. It flows from Watershops Pond (also known as Lake Massasoit) to its confluence with the Connecticut River. It is referred to as "The Miracle Mile" in a 2009 master's thesis that outlines possibilities for reclaiming the river's mouth as a recreational area. As of 2011, the final of the river, including its mouth, is confined in a pipe underneath Interstate 91 and a car dealership. Many Springfield residents bemoan the loss of the Mill River as a recreational area, and hope to gain greater access to both it and Connecticut Rivers in upcoming years. As it has for over a century, today the Mill River serves as a barrier between Springfield neighborhoods. Surrounding it are some of the most densely urbanized locations in Springfield.