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The Sudbury River is a 32.7-mile-long (52.6 km) tributary of the Concord River in Middlesex County, Massachusetts, in the United States. [1]Originating in the Cedar Swamp in Westborough, Massachusetts, near the boundary with Hopkinton, the Sudbury River meanders generally northeast, through Fairhaven Bay, and to its confluence with the Assabet River at Egg Rock in Concord, Massachusetts, to ...
Sudbury Dam was built in 1894 to impound the Stony Brook branch of the Sudbury River. It has a large earthen embankment 1,800 feet (550 m) in length, and a concrete core wall with a spillway 300 feet (91 m) wide. There is a gate chamber, designed by Wheelwright & Haven, located on the dam north of the spillway.
It was created when the Sudbury Dam was constructed to impound the Stony Brook branch of the Sudbury River; no part of the reservoir lies in the town of Sudbury. Nearly 5,000 acres (2,000 ha) in the Sudbury Reservoir watershed are administered by the Massachusetts Department of Conservation and Recreation as a limited-access public recreation area.
The dam and spillway were built in Ashland, a rural outer suburb west of Boston, in 1885 as one of the later elements of Boston's second major water supply system.This system impounded large sections of the Sudbury River, primarily in Framingham, from where the water was piped toward Boston via the Sudbury Aqueduct.
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, with rip-rap below. The spillway is at the northern end of the dam, and is a 650-foot (200 m) series of steps lined with granite set in concrete.
The gates allowed water to be selectively channeled from any of the reservoirs (1, 2, or 3) into the Sudbury Aqueduct or into the river below the dam. There are also flood gates and equipment for moving the dam's flashboards. Today the gatehouse, Sudbury Aqueduct, and the pipes from reservoir number 3 remain part of MWRA's emergency systems.
The dam and gatehouse are located at the southeastern end of Framingham Reservoir No. 3, off Massachusetts Route 9. They were built 1876–78 as part of an expansion of the public water supply of the city of Boston. The dam is 2,280 feet (690 m) long, and impounds an area of 253 acres (102 ha) in the Sudbury River watershed. The reservoir is ...
The river begins in Middlesex County, formed by the confluence of the Sudbury and Assabet Rivers at Egg Rock, near the Concord town center. It flows generally north, from eastern Concord (along the northwestern edge of the Boston metropolitan area), joining the Merrimack River from the south on the eastern side of Lowell.