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LakeQuality
Pink and orange afterglow over the treeline on Slim Lake after sunset

Mesotrophic Lakes in Massachusetts

39 mesotrophic lakes in Massachusetts. Moderate nutrients, good water quality.

Most well-managed working lakes register as mesotrophic — the band that balances productivity with clarity. 39 lakes in Massachusetts sit in the mesotrophic band. About 0% are deep (50+ ft); the rest are shallower basins where watershed management keeps nutrients from pushing the system into eutrophy.

Mesotrophic lakes sit in the middle of the phosphorus and chlorophyll-a range: productive but still clear, with readings that rarely reach the EPA's poorest condition class.

#LakeCountyClarityDepthTSI
1Long PondBarnstable--48
2Gaston PondWorcester--43
3Bare Hill PondWorcester--38
4Card PondBerkshire--43
5Queen LakeWorcester--43
6Roaring Brook LakeFranklin--42
7Benton PondBerkshire--40
8Wrights ReservoirWorcester--39
9Ashley LakeBerkshire--45
10Quacumquasit PondWorcester--43
11Hamilton ReservoirHampden--41
12Atkins ReservoirFranklin--44
13West Branch Walker Brook LakeBerkshire--40
14Tully PondFranklin--43
15Damon PondHampshire--44
16South ReservoirMiddlesex--40
17Robbins PondPlymouth--42
18Walden PondEssex--43
19Fitchburg ReservoirMiddlesex--41
20Wachusett LakeWorcester--39
21Ponkapoag PondNorfolk--41
22Crystal LakeWorcester--42
23Crystal LakeEssex--42
24Fort PondWorcester--44
25Lower Crow Hill PondWorcester--41
26Marys PondPlymouth--40
27Ezekiel PondPlymouth--46
28Shubael PondBarnstable--49
29Island PondPlymouth--48
30Wankinco River LakePlymouth--44
31Chebacco LakeEssex--50
32Little River LakeWorcester--48
33Buckley-Dunton LakeBerkshire--50
34East Brimfield ReservoirWorcester--48
35Metacomet LakeHampshire--47
36Vinica PondHampden--47
37Sargent PondWorcester--47
38Field PondEssex--49
39Nabnasset PondMiddlesex--48
All mesotrophic lakes →Minnesota version →Wisconsin version →Illinois version →Michigan version →Iowa version →Ohio version →Pennsylvania version →New York version →Missouri version →Indiana version →North Dakota version →South Dakota version →Florida version →Colorado version →North Carolina version →Vermont version →Texas version →Oregon version →Arkansas version →Oklahoma version →Kansas version →Nebraska version →Nevada version →Arizona version →Idaho version →Montana version →New Mexico version →Tennessee version →Alabama version →Virginia version →Kentucky version →Utah version →Washington version →Wyoming version →Georgia version →Ontario version →Québec version →Nova Scotia version →British Columbia version →Newfoundland and Labrador version →All Massachusetts lakes →

Source: EPA National Aquatic Resource Surveys, 2026.