The Mystic Dam is a historic dam between Lower and Upper Mystic Lakes in Winchester, Massachusetts

Winchester, Massachusetts

Winchester is a town located in Middlesex County, Massachusetts, eight miles north of Boston. With its agricultural roots having mostly disappeared, it is now an affluent suburb...

, USA.

The dam was built in 1864 and added to the National Register of Historic Places in 1990. Listed as one of a number of unsafe dams in Massachusetts, it underwent major renovation in 2010 that significantly expanded its spillway

Spillway

A spillway is a structure used to provide the controlled release of flows from a dam or levee into a downstream area, typically being the river that was dammed. In the UK they may be known as overflow channels. Spillways release floods so that the water does not overtop and damage or even destroy...

 capacity. The dam's historic gatehouse

Mystic Gatehouse

Mystic Gatehouse is a historic gatehouse on the southeastern end of Upper Mystic Lake in Winchester, Massachusetts, off the Mystic Valley Parkway. The building once housed the control station for the adjacent Mystic Dam....

is nearby.