Hopkinton Dam and Spillway — Wikipedia

The Hopkinton Dam and Spillway is a historic site at the eastern end of Hopkinton Reservoir in Hopkinton State Park in Ashland, Massachusetts. The western end of the reservoir lies in the town of Hopkinton. The reservoir was constructed between 1891 and 1894 as part of the city of Boston's second major water works project, the impoundment of significant portions of the Sudbury River watershed. The Hopkinton Dam impounds Indian Brook, a Sudbury River tributary, creating the reservoir to its south. The core of the dam is concrete, with earthen embankments that are bermed on the water side,...