Quabbin Reservoir

Quabbin Reservoir
Name	Quabbin Reservoir
Caption	Aerial view of the reservoir
Location	Massachusetts
Coords	42, 21, 33, N...
Type	Reservoir
Inflow	Swift River
Outflow	Swift River
Catchment	186 sqmi
Basin countries	United States
Length	18 mi
Width	3 mi
Area	38.6 sqmi
Volume	412 e9USgal
Residence time	2–3 years
Elevation	530 ft
Frozen	Partial in winter
Cities	Boston

Quabbin Reservoir is a vast man-made body of water located in central Massachusetts, serving as the primary water source for the Greater Boston metropolitan area. Created in the 1930s by impounding the Swift River, it is one of the largest unfiltered water supplies in the United States. The reservoir and its surrounding protected lands form the Quabbin Reservation, a critical natural resource managed by the Massachusetts Department of Conservation and Recreation.

History

The need for a new water source became urgent for Boston in the early 20th century as its population grew and existing supplies from the Cochituate Aqueduct and Sudbury Reservoir proved insufficient. The Metropolitan District Commission spearheaded the project, which required the disincorporation and flooding of four Swift River Valley towns: Dana, Enfield, Greenwich, and Prescott. This controversial decision, authorized by the Massachusetts General Court, led to the relocation of over 2,500 residents and the removal of bodies from several cemeteries, including the Quaker Cemetery in Enfield. The project was a monumental undertaking in public works, comparable in scale to other major New Deal projects like the Tennessee Valley Authority.

Construction and Engineering

Construction began in 1927 and was largely completed by 1939, involving thousands of workers from the Civilian Conservation Corps. The central engineering feat was the construction of the Winsor Dam, a massive earthen structure, and the Goodnough Dike. These structures impounded the Swift River and its tributaries, flooding the valley. A critical component is the Quabbin Aqueduct, a deep-rock tunnel that conveys water eastward to the Wachusett Reservoir and ultimately to the Metropolitan Boston system. The design incorporated advanced principles of civil engineering for the era, ensuring structural integrity and water quality protection.

Geography and Hydrology

The reservoir is situated within the towns of Ware, Belchertown, Pelham, and New Salem. It lies within the Connecticut River watershed, with its own drainage basin encompassing parts of the former Swift River Valley. Key geographical features include Mount Zion and Prescott Peninsula, which juts into the reservoir. The primary inflow is the Swift River, fed by smaller streams, while outflow is controlled at the Winsor Dam spillway. The Quabbin Reservation encompasses over of protected forest and shoreline.

Ecology and Wildlife

The protected watershed has become a significant wildlife sanctuary, managed to preserve water quality and biodiversity. The area is a major breeding ground for the Bald Eagle, reintroduced successfully in the 1980s, and supports a healthy population of Common Loon. Other notable species include White-tailed Deer, Black Bear, and Moose. The Massachusetts Division of Fisheries and Wildlife oversees management, balancing conservation with the primary mission of water supply protection. The reservoir's ecology is studied by institutions like the University of Massachusetts Amherst.

Water Supply and Management

Operated by the Massachusetts Water Resources Authority (MWRA), it supplies an average of 200 million gallons daily to approximately 3 million people in 51 communities, including Boston, Cambridge, and Somerville. The water is treated with chlorination and corrosion control but remains unfiltered due to the pristine condition of the protected watershed, under a waiver from the EPA's Surface Water Treatment Rule. System integrity is monitored constantly, with water quality testing conducted at facilities like the John J. Carroll Water Treatment Plant.

Cultural Impact and Recreation

The loss of the four towns remains a poignant chapter in Massachusetts history, memorialized at the Quabbin Park Cemetery and the Swift River Valley Historical Society. The reservoir has inspired works such as the poem "The Lost Towns" and is a setting in novels by Anita Shreve. Limited public access allows for recreational activities like fishing (for species including Lake Trout and Smallmouth Bass), hiking, and birdwatching on designated roads and trails. The Enfield Lookout offers a panoramic view, and educational programs are run by the Massachusetts Department of Conservation and Recreation.

Category:Reservoirs in Massachusetts Category:Buildings and structures in Worcester County, Massachusetts Category:Water supply infrastructure in Massachusetts