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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 tend to grade B or C on our A–F scale — the productive-but-clear band lines up with the middle of the letter grades.

#LakeCountyGradeClarityDepthTSI
1Long PondBarnstableA--48
2Gaston PondWorcesterA--43
3Bare Hill PondWorcesterA--38
4Card PondBerkshireA--43
5Queen LakeWorcesterA--43
6Roaring Brook LakeFranklinA--42
7Benton PondBerkshireA--40
8Wrights ReservoirWorcesterA--39
9Ashley LakeBerkshireA--45
10Quacumquasit PondWorcesterA--43
11Hamilton ReservoirHampdenA--41
12Atkins ReservoirFranklinA--44
13West Branch Walker Brook LakeBerkshireA--40
14Tully PondFranklinA--43
15Damon PondHampshireA--44
16South ReservoirMiddlesexA--40
17Robbins PondPlymouthA--42
18Walden PondEssexA--43
19Fitchburg ReservoirMiddlesexA--41
20Wachusett LakeWorcesterA--39
21Ponkapoag PondNorfolkA--41
22Crystal LakeWorcesterA--42
23Crystal LakeEssexA--42
24Fort PondWorcesterA--44
25Lower Crow Hill PondWorcesterA--41
26Marys PondPlymouthA--40
27Ezekiel PondPlymouthA--46
28Shubael PondBarnstableA--49
29Island PondPlymouthA--48
30Wankinco River LakePlymouthA--44
31Chebacco LakeEssexC--50
32Little River LakeWorcesterC--48
33Buckley-Dunton LakeBerkshireC--50
34East Brimfield ReservoirWorcesterC--48
35Metacomet LakeHampshireC--47
36Vinica PondHampdenC--47
37Sargent PondWorcesterC--47
38Field PondEssexC--49
39Nabnasset PondMiddlesexC--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.