The Wachusett Reservoir is a massive lake with an access in Clinton, Massachusetts. It is currently operated as a state park by the Massachusetts Department of Conservation and Recreation.

The Wachusett Reservoir is a very well noted body of water in the state of Massachusetts. Upon its completion in 1905, it became the largest public water supply reservoir in the entire world with a surface area of seven square miles, maximum depth of 120 feet, and water capacity of up to sixty five billion US gallons. It extends to different neighboring towns and neighborhoods including Boylston, Clinton, Rutland, Princeton, Holden, and Leominster.

Visitors of the Wachusett Reservoir can easily enjoy picnicking, bird watching, snowshoeing, and shoreline fishing at the park.