Dams in Middlesex County, Massachusetts

143Total Dams

42High Hazard

65Significant

Dam Safety in Middlesex County, Massachusetts

Middlesex County has 143 dams tracked in the National Inventory of Dams. Of these, 42 are classified as high hazard — meaning failure would probably cause loss of human life. Another 65 carry a significant hazard classification. Currently, 34 dams have a condition assessment of poor or unsatisfactory.

The average dam in Middlesex County is 128 years old. The most common purpose is recreation. The tallest dam is Ashland Reservoir Dam at 59 ft.

Explore more: Oldest dams in Massachusetts · Tallest dams · High risk dams · Largest reservoirs

Dam	Hazard	Condition	Height (ft)	Purpose	Year
Ashland Reservoir Dam	High	Satisfactory	59	Recreation	1900
Hopkinton Reservoir Dam	High	Satisfactory	58	Recreation	1891
Mill Pond Dam	High	Satisfactory	50	Water Supply	1973
Fells Reservoir Dam No. 8	High	Satisfactory	48	Water Supply	1898
South Reservoir Dam	High	Poor	45	Water Supply	1882
Weston Reservoir Dam	High	Satisfactory	45	Water Supply
Norumbega Reservoir Dam No. 1	High	Fair	42	Water Supply	1940
Echo Lake Dam	High	Satisfactory	41	Water Supply	1881
Mill Pond South Dike	High	Satisfactory	39	Water Supply	1973
Norumbega Reservoir East Dike	High	Satisfactory	34	Water Supply	1940
Norumbega Reservoir Dike No. 4	High	Satisfactory	34	Water Supply	1940
Central Street Dam	High	Fair	34	Other	1659
Tyler Dam	High	Satisfactory	34	Flood Risk Reduction	1965
Stony Brook Reservoir Dam	High	Satisfactory	32	Water Supply	1887
Cambridge Reservoir Dam	High	Satisfactory	31	Water Supply	1897
Framingham Reservoir No. 3 Dam	High	Satisfactory	29	Water Supply	1880
Constance M. Fiske Flood Retarding Dam	High	Satisfactory	28	Flood Risk Reduction	1984
Wright's Pond Dam	High	Fair	27	Recreation
Framingham Reservoir No. 2 Dam	High	Poor	27		1878
Lowell Reservoir Dam	High	Fair	26	Recreation	1872
Fort Meadow Reservoir Dam	High	Poor	26	Recreation	1848
North Reservoir Dam	High	Poor	25	Water Supply	1874
Fells Reservoir Dam No. 3	High	Satisfactory	25	Water Supply	1898
Damon Pond Dam	High	Poor	24	Recreation	1938
Pepperell Paper	High	Satisfactory	24	Hydroelectric	1918
Schencks Pond Dam	High	Satisfactory	22	Water Supply	1940
Moody Street Dam	High	Fair	22	Recreation	1847
Framingham Reservoir No. 1 Dam	High	Fair	22	Flood Risk Reduction	1878
Main Street Dam	High	Poor	18	Recreation	1882
Squannacook River Dam	High	Fair	18	Recreation
Hopkinton State Park Swimming Pool Dam	High	Satisfactory	16	Recreation	1967
South Reservoir East Dike	High	Satisfactory	15	Water Supply	1882
Arlington Reservoir Dam	High	Fair	14	Recreation	1872
Mill Pond Dam	High	Fair	14	Recreation	1900
Lake Cochituate Dam And Gate House	High	Satisfactory	14	Recreation	1920
Charles River Dam At South Natick	High	Poor	14	Recreation
Hager Pond Dam	High	Unsatisfactory	13	Recreation	1710
Lake Williams Dam	High	Fair	11		1882
Ames Pond Dike A	High	Satisfactory	11	Recreation
Ames Pond Dam	High	Fair	11	Recreation
Houghton Pond Dam	High	Poor	10	Recreation	1898
Lost Lake Dam	High	Satisfactory	10	Recreation	1910
Mill Pond North Dike	Significant	Satisfactory	40	Water Supply	1973
Norumbega Reservoir Dike No. 3	Significant	Satisfactory	34	Water Supply	1940
Norumbega Reservoir Dike No. 2	Significant	Satisfactory	34	Water Supply	1940
Freeman Lake Dam	Significant	Satisfactory	29	Recreation	1976
Ashby Reservoir Dam	Significant	Fair	28	Water Supply	1918
Metropolitan Circular Dam	Significant	Satisfactory	27	Recreation
Millham Reservoir Dam	Significant	Satisfactory	26	Water Supply	1893
Snake Brook Dam	Significant	Poor	25	Recreation	1879
Stony Brook Dam	Significant	Fair	24	Recreation	1870
Fletcher Pond Dam	Significant	Fair	24	Recreation	1950
Butterfield Pond Dam	Significant	Satisfactory	22	Recreation	1938
Delaney Complex Dam	Significant	Satisfactory	22	Flood Risk Reduction	1967
Beaver Brook Dam	Significant	Poor	21
Clock Tower Dam	Significant	Satisfactory	20	Recreation	1890
Russell Mill Pond Dam	Significant	Satisfactory	18	Recreation	1954
Spot Pond Dam	Significant	Satisfactory	18	Water Supply	1880
Carding Mill Pond Dam	Significant	Fair	17	Recreation	1930
Erikson Dam	Significant	Fair	17	Recreation	1848
Fells Reservoir Dam No. 6	Significant	Satisfactory	17	Water Supply	1898
Washington Street Dam	Significant	Fair	16
Victory Lane Dam	Significant	Poor	16
Brookside Mill Dam	Significant	Fair	16	Hydroelectric	1862
Talbot Mills Dam	Significant	Fair	16	Flood Risk Reduction	1828
Barefoot Brook Dam	Significant	Satisfactory	16	Flood Risk Reduction	1962
Upper Mystic Lake Dam	Significant	Satisfactory	16	Flood Risk Reduction	1860
Nagog Pond Dam	Significant	Satisfactory	15	Water Supply	1909
Middle Reservoir Dike	Significant	Fair	15	Water Supply	1891
Woodwards Mill Dam	Significant	Satisfactory	15	Recreation
Whitehall Reservoir Distribution Dam	Significant	Satisfactory	15	Recreation
Bulloughs Pond Dam	Significant	Poor	15
Hemlock Gorge Spillway Dike	Significant	Satisfactory	15	Recreation
Horn Pond Dam	Significant	Fair	15	Water Supply	1989
Massapoag Pond Dam	Significant	Fair	14	Recreation
Valley Pond Dam	Significant	Satisfactory	14	Recreation	1962
Nabnasset Pond Dam	Significant	Fair	14	Recreation	1926
Locust Pond Dam	Significant	Satisfactory	14	Recreation	1949
Old Water Supply Dam	Significant	Satisfactory	13	Recreation	1900
Factory Pond Dam	Significant	Poor	13	Recreation	1873
Cow Pond Brook Dam	Significant	Fair	13	Recreation
Assabet	Significant	Satisfactory	13	Hydroelectric	1921
Cedar Street Dam	Significant	Fair	12	Recreation
Balch Pond Dam	Significant	Poor	12	Flood Risk Reduction
Westford Depot Dam	Significant	Fair	12	Flood Risk Reduction
Fells Reservoir Dam No. 2	Significant	Satisfactory	12	Water Supply	1898
Wilson Corne Mill Dam	Significant	Satisfactory	12	Recreation	1675
Newton Lower Falls Dam	Significant	Poor	12	Recreation
Bloods Pond Dam	Significant	Fair	12	Recreation
Valley Pond Dike	Significant	Satisfactory	11	Recreation	1961
Cordingly Dam	Significant	Fair	11	Recreation	1912
Townsend Harbor Dam	Significant	Satisfactory	11	Recreation	1870
Whitehall Upper Pond Dam	Significant	Poor	10	Recreation
Lake Boon Dam	Significant	Poor	10	Recreation	1847
Watertown Dam	Significant	Fair	10	Recreation
Lexington Reservoir Dam	Significant	Satisfactory	10	Recreation
Stearns Millpond Dam	Significant	Satisfactory	9	Recreation	1677
Curve Street Dam	Significant	Fair	9		1904
Upper Flannagan Pond Dam	Significant	Poor	9	Recreation	1955
Crosby Pond Dam	Significant	Unsatisfactory	9	Recreation
Murray Printing Company Dam	Significant	Satisfactory	9	Recreation	1910
Collinsville Dam	Significant	Poor	9	Other	1850
Warner's Pond Dam	Significant	Satisfactory	9	Recreation	1857
Upper Flint Pond Dam	Significant	Poor	9	Recreation
Whitehall Reservoir Dam	Significant	Satisfactory	8	Recreation
Ames Pond Dike B	Significant	Satisfactory	6	Recreation
Balch Pond Dike	Significant	Poor	3	Flood Risk Reduction
Fells Reservoir Dam No. 1 (extensively Filled D/s Area)	Low	Satisfactory	48	Water Supply
Lower Flint Pond Dam	Low	Fair	28	Fire Protection, Stock, Or Small Fish Pond
Fitchburg Reservoir North Dam	Low	Fair	27	Water Supply	1916
Waban Hill Reservoir Dam	Low	Satisfactory	24	Recreation	1900
Estabrook Farm Pond Dam	Low	Poor	22	Recreation
Pond At West Road Dam	Low	Unsatisfactory	20
Merrimack Dam	Low	Satisfactory	20	Hydroelectric	1847
Silk Mill Dam	Low	Fair	20	Flood Risk Reduction	1912
Fitchburg Reservoir Southeast Dam	Low	Fair	20	Water Supply	1916
Fitchburg Reservoir South Dike	Low	Fair	19	Water Supply	1916
Grist Mill Pond Dam	Low	Fair	18	Recreation	1800
Hollingsworth & Vose Company Dam	Low	Fair	17	Other	1900
Mill Pond Dam	Low	Fair	16	Recreation	1958
Weston's Dam	Low	Poor	15	Recreation	1970
Assabet River Dam	Low	Poor	15	Recreation	1924
Allen Dam	Low	Fair	15	Recreation	1797
Ice House	Low	Satisfactory	15	Hydroelectric	1906
Waseeka Sanctuary Dam	Low	Poor	12	Fish and Wildlife Pond	1965
Mason Road Dam	Low	Poor	11	Recreation	1870
Grist Mill Dam	Low	Poor	10	Recreation
Spot Pond Dike No. 5	Low	Satisfactory	10	Water Supply	1880
Spot Pond Dike No. 4	Low	Satisfactory	10	Water Supply	1880
Hobbs Pond Dam	Low	Satisfactory	9	Recreation	1900
Farrar Pond Dam	Low	Fair	9	Recreation	1920
Ben Smith Dam	Low	Satisfactory	9	Recreation	1870
Barretts Mill Road Dam	Low	Satisfactory	9	Recreation
Bixby Reservoir Dam	Low	Satisfactory	9	Recreation	1950
Wedge Pond Dam	Low	Fair	9	Recreation	1900
Cranberry Bog Dam	Low	Satisfactory	8	Irrigation	1920
Bleachery Dam	Low	Satisfactory	8	Recreation	1900
Heald Pond Dam	Low	Poor	8	Recreation	1900
Long Pond Dam	Low	Fair	8	Recreation	1900
Musketaquid Pond Upper Dam	Low	Satisfactory	8	Recreation	1900
Sudbury River Dam	Low	Poor	7
Mount Wayte Outlet Works	Low	Poor	7	Recreation
Plow Shop Pond Dam	Low	Poor	7	Recreation	1856

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