The Clinton Dam, also known as the Wachusett Dam, is a historic structure that blocks the Nashua River and creates the Wachusett Reservoir. The dam was built between 1897 and 1905 as part of the water supply system for greater Boston. The dam is open to the public twice a year for tours and walks, offering views of the reservoir and the surrounding landscape. 

Wachusett Reservoir, along with the Quabbin Reservoir and Ware River, is an unfiltered source of high-quality water for the Massachusetts Water Resources Authority water supply system. The 65-billion-gallon reservoir covers 108 square miles with 37 miles of shoreline. Recreational activities are regulated and limited to protect 3 million people’s drinking water.