The Mill River is a 1.25-mile (2.01 km) long tributary of the Connecticut River in Springfield
. 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.
A 2009 master's thesis describes a plan that could revitalize the Mill River and its surrounding neighborhoods by remaking the river as a recreational attraction, connecting the Connecticut River and the Basketball Hall of Fame with Watershops Pond and Springfield College.