Lakes / Massachusetts / Middlesex County

Lakes in Middlesex County, Massachusetts

93 lakes counted in Middlesex County - the largest is Whitehall Reservoir at 620 acres.

Lakes Counted

620 acres

Largest - Whitehall Reservoir

100 ft

Deepest - Walden Pond

Middlesex County, highlighted, with its largest counted lakes dotted. Outlines from Census boundary data.

All Counted Lakes

#	Lake	County	Surface Area	Max Depth
1	Whitehall Reservoir	Middlesex	620 acres	30 ft
2	Cambridge Reservoir	Middlesex	471.14 acres	-
3	Spot Pond	Middlesex	298 acres	47 ft
4	Nashua River Reservoir	Middlesex	295.55 acres	-
5	Nagog Pond	Middlesex	282.63 acres	-
6	Lake Quannapowitt	Middlesex	254 acres	11 ft
7	Fort Meadow Reservoir	Middlesex	248.34 acres	-
8	Foss Reservoir (Number Three)	Middlesex	231.07 acres	-
9	Forge Pond	Middlesex	202.87 acres	-
10	Lake Cochituate	Middlesex	196 acres	-
11	Upper Mystic Lake	Middlesex	178 acres	-
12	Lake Boon	Middlesex	173.41 acres	-
13	Ashland Reservoir	Middlesex	173 acres	50 ft
14	Long Pond	Middlesex	166.71 acres	-
15	Flints Pond	Middlesex	161.8 acres	-
16	Fitchburg Reservoir	Middlesex	153 acres	23 ft
17	Farm Pond	Middlesex	151 acres	21 ft
18	Nabnasset Pond	Middlesex	142 acres	26 ft
19	Lake Winthrop	Middlesex	137 acres	24 ft
20	Farm Pond	Middlesex	125.04 acres	-
21	Lost Lake	Middlesex	122.42 acres	-
22	Stearns Reservoir (Number 1)	Middlesex	118.17 acres	-
23	Horn Pond	Middlesex	116 acres	60 ft
24	Massapoag Ponds	Middlesex	111.18 acres	-
25	Morses Pond	Middlesex	110.7 acres	-
26	Bracket Reservoir (Number Two)	Middlesex	110.46 acres	-
27	Long Sought-for Pond	Middlesex	105 acres	26 ft
28	Echo Lake	Middlesex	105 acres	-
29	Spy Pond	Middlesex	102 acres	36 ft
30	Fort Pond	Middlesex	101.81 acres	-
31	Long Pond	Middlesex	101.81 acres	-
32	Heart Pond	Middlesex	93 acres	22 ft
33	Lower Mystic Lake	Middlesex	92.91 acres	-
34	Martins Pond	Middlesex	89.7 acres	-
35	Waushakum Pond	Middlesex	87.23 acres	-
36	Newfield Pond	Middlesex	85 acres	21 ft
37	Baddacook Pond	Middlesex	84 acres	51 ft
38	Dudley Pond	Middlesex	83.27 acres	-
39	Crystal Lake	Middlesex	83.05 acres	-
40	Farrar Pond	Middlesex	82.69 acres	-
41	Flannagan Pond	Middlesex	80.44 acres	-
42	South Reservoir	Middlesex	79.62 acres	-
43	Spectacle Pond	Middlesex	79.07 acres	-
44	Heard Pond	Middlesex	75.61 acres	-
45	Williams Lake	Middlesex	73.96 acres	-
46	Peters Pond	Middlesex	72.9 acres	-
47	Flint Pond	Middlesex	72.15 acres	-
48	Fairhaven Bay	Middlesex	71.91 acres	-
49	Fisk Pond	Middlesex	70 acres	6 ft
50	Sandy Pond	Middlesex	68.66 acres	-
51	Millham Reservoir	Middlesex	68.45 acres	-
52	Grove Pond	Middlesex	67.46 acres	-
53	Weston Reservoir	Middlesex	67.38 acres	-
54	Nutting Lake	Middlesex	67 acres	8 ft
55	Fresh Pond	Middlesex	66 acres	30 ft
56	Knops Pond	Middlesex	63.93 acres	-
57	Walden Pond	Middlesex	62 acres	100 ft
58	Warners Pond	Middlesex	61.28 acres	-
59	North Reservoir	Middlesex	59.44 acres	-
60	Mill Pond Reservoir	Middlesex	58.25 acres	-
61	Middle Reservoir	Middlesex	55.65 acres	-
62	Ward Pond	Middlesex	54.12 acres	-
63	Dug Pond	Middlesex	54 acres	45 ft
64	White Pond	Middlesex	53.35 acres	-
65	Mill Pond	Middlesex	50.45 acres	-
66	Long Pond	Middlesex	45.96 acres	-
67	Richardson Pond	Middlesex	45.71 acres	-
68	Althea Lake	Middlesex	43 acres	16 ft
69	Hardys Pond	Middlesex	42.77 acres	-
70	Long Pond	Middlesex	42.5 acres	-
71	Carding Millpond	Middlesex	40.53 acres	-
72	Nonesuch Pond	Middlesex	39.78 acres	-
73	Harbor Pond	Middlesex	39.29 acres	-
74	Norumbega Reservoir	Middlesex	38.05 acres	-
75	Ashby Reservoir	Middlesex	37.54 acres	-
76	Keyes Pond	Middlesex	36.32 acres	-
77	White Pond	Middlesex	36.08 acres	-
78	Fletchers Pond	Middlesex	35.09 acres	-
79	Whitney Pond	Middlesex	34.1 acres	-
80	Learned Pond	Middlesex	33.85 acres	-
81	Russell Millpond	Middlesex	32.87 acres	-
82	Cramberry Bog Reservoir Number One	Middlesex	31.38 acres	-
83	Lower Massapoag Pond	Middlesex	31.38 acres	-
84	Hager Pond	Middlesex	30 acres	-
85	Coon Tree Pond	Middlesex	29.41 acres	-
86	Heald Pond	Middlesex	29 acres	33 ft
87	Plow Shop Pond	Middlesex	28.66 acres	-
88	Puffer Pond	Middlesex	28.42 acres	-
89	Crystal Lake	Middlesex	27.18 acres	-
90	Batemans Pond	Middlesex	25.7 acres	-
91	Burges Pond	Middlesex	25.7 acres	-
92	Wedge Pond	Middlesex	24 acres	17 ft
93	Gleason Pond	Middlesex	12 acres	13 ft

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Sources: Massachusetts Division of Fisheries and Wildlife lake data; USGS. Verified October 30, 2026.