Largest Reservoirs in New York

New York has 1838 dams with recorded storage capacity. The largest is Lake George Outlet - Canal Intake with 2,250,000 acre-feet of maximum storage. One acre-foot equals about 326,000 gallons — enough to supply roughly two households for a year.

#	Dam	County	Max Storage (acre-ft)	Height (ft)	Purpose	Year
1	Lake George Outlet - Canal Intake	Essex	2,250,000	28	Hydroelectric	1987
2	Long Sault North	St. Lawrence	803,000	25	Hydroelectric	1958
3	Massena Intake	St. Lawrence	803,000	118	Hydroelectric	1958
4	Iroquois	St. Lawrence	803,000	72	Hydroelectric	1958
5	Long Sault	St. Lawrence	803,000	132	Hydroelectric	1958
6	Conklingville	Saratoga	792,000	100	Hydroelectric	1930
7	Mud Lock C&s Canal Dam	Cayuga	663,000	20	Navigation	1912
8	Downsville Dam	Delaware	609,740	204	Water Supply	1954
9	Ashokan Dam	Ulster	512,500	213	Water Supply	1916
10	Cannonsville Dam	Delaware	450,000	175	Water Supply	1964
11	Waterloo	Seneca	447,600	17	Hydroelectric	1915
12	Mount Morris Dam	Livingston	408,000	249	Flood Risk Reduction	1952
13	Otsego Lake Dam	Otsego	345,320	11	Recreation	1900
14	Caughdenoy Dam	Oswego	255,360	15	Navigation	1909
15	Merriman Dam	Ulster	202,800	195	Water Supply	1945
16	Whitney Point Dam	Broome	176,000	95	Flood Risk Reduction	1942
17	Indian Lake Stone Dam	Hamilton	170,235	47	Recreation	1898
18	Keuka Lake Outlet Dam	Yates	165,000	11	Recreation	1880
19	Skaneateles Lake Dam	Onondaga	160,000	22	Recreation	1902
20	Neversink Reservoir Dam	Sullivan	142,000	190	Water Supply	1953
21	Warner Dam	Chautauqua	117,105	12	Recreation	1979
22	Kensico Dam	Westchester	116,560	168	Water Supply	1916
23	Lake Placid Dam	Essex	112,996	7	Recreation	1904
24	Stillwater - South Dam	Herkimer	108,000	20	Hydroelectric	1924
25	Carry Falls Dike A	St. Lawrence	104,463	17	Hydroelectric	1953
26	Winnies Reef Dam	Saratoga	100,700	16	Recreation	1979
27	New Croton Reservoir Dam	Westchester	96,000	174	Water Supply	1906
28	Gilboa Dam	Schoharie	95,575	183	Water Supply	1926
29	Chazy Lake Dam	Clinton	90,000	19	Recreation	1926
30	Delta Dam	Oneida	88,179	106	Navigation	1912
31	Hinckley	Herkimer	76,200	83	Hydroelectric	1914
32	Lewiston	Niagara	76,000	155	Hydroelectric	1963
33	Bradford Dam	Steuben	74,000	13	Hydroelectric	1950
34	Bartlett Carry Dam	Franklin	70,924	17	Other	1915
35	Crescent - Dam C	Albany	70,000	16	Hydroelectric	1912
36	Waterbury Roadway Embankment	Oswego	66,500	5	Hydroelectric	1914
37	Bennetts Bridge - Dike B	Oswego	66,500	13	Hydroelectric	1914
38	Bennetts Bridge - Dike C	Oswego	66,500	10	Hydroelectric	1914
39	Bennetts Bridge	Oswego	66,500	35	Hydroelectric	1914
40	Owasco Lake Outlet Dam	Cayuga	64,233	14	Recreation	1972
41	East Sidney Dam	Delaware	58,350	130	Flood Risk Reduction	1950
42	Cranberry Lake Dam	St. Lawrence	57,400	24	Recreation	1917
43	Tomhannock Reservoir Dam	Rensselaer	56,600	68	Water Supply	1905
44	Croton Falls Dam	Putnam	49,760	113	Water Supply	1910
45	Onondaga Dam	Onondaga	48,400	67	Flood Risk Reduction	1949
46	Otisco Lake Dam	Onondaga	47,890	18	Recreation	1956
47	West Branch Dam	Putnam	42,300	85	Water Supply	1895
48	Carmel Auxiliary Dike	Putnam	42,300	64	Water Supply	1895
49	Brant Lake Upper Dam	Warren	41,280	12	Recreation	1908
50	Hemlock Lake Dam	Livingston	41,101	12	Water Supply	1926

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