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LakeQuality
A storm cloud deck moving over Slim Lake at dusk, the last light breaking through low on the horizon

Eutrophic Lakes in Massachusetts

26 eutrophic lakes in Massachusetts. High nutrients, frequent algae, reduced clarity.

A eutrophic lake is a productive ecosystem with the trade-offs that come with productivity: more food at the base of the food web, more clarity reduction by mid-summer, more dissolved-oxygen variability near the bottom. 26 Massachusetts lakes register as eutrophic. Only 0% are deep — eutrophy correlates with shallowness, agricultural watersheds, and the kind of nutrient-input history that takes decades to shift.

Eutrophic lakes typically carry higher phosphorus and chlorophyll-a readings. The same nutrient richness that defines the trophic class shows up in those numbers.

#LakeCountyClarityDepthTSI
1Mashpee PondBarnstable--52
2Stillwater PondBarnstable--52
3Williams PondBarnstable--54
4Fresh PondPlymouth--52
5Windsor LakeBerkshire--50
6Cambridge ReservoirMiddlesex--50
7Hinckleys PondBarnstable--58
8Coonamessett PondBarnstable--58
9Halfway PondPlymouth--59
10Watson PondBristol--50
11Monponsett PondPlymouth--56
12Congamond LakesHartford--60
13Lower Spectacle PondBerkshire--56
14Pequot PondHampden--63
15Muddy Brook LakeWorcester--56
16Robbins PondWorcester--59
17Stodge Meadow PondWorcester--52
18Stiles PondEssex--55
19Little Chauncy PondWorcester--64
20Upper Artichoke ReservoirEssex--64
21Heart PondMiddlesex--57
22Boons PondMiddlesex--53
23Cleveland PondPlymouth--58
24Ten Mile River LakeBristol--60
25Ames Long PondBristol--52
26Horn PondMiddlesex--56
All eutrophic 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.