What are eutrophic lakes in Massachusetts?

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

What does eutrophic mean?

High nutrients, frequent algae, reduced clarity.

Eutrophic Lakes in Massachusetts

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 grade C or D on our A–F scale. The same nutrient richness that defines the trophic class drives the lower grade.

#	Lake	County	Grade	Clarity	Depth	TSI
1	Mashpee Pond	Barnstable	B	-	-	52
2	Stillwater Pond	Barnstable	B	-	-	52
3	Williams Pond	Barnstable	B	-	-	54
4	Fresh Pond	Plymouth	B	-	-	52
5	Windsor Lake	Berkshire	C	-	-	50
6	Cambridge Reservoir	Middlesex	C	-	-	50
7	Hinckleys Pond	Barnstable	C	-	-	58
8	Coonamessett Pond	Barnstable	C	-	-	58
9	Halfway Pond	Plymouth	C	-	-	59
10	Watson Pond	Bristol	C	-	-	50
11	Monponsett Pond	Plymouth	D	-	-	56
12	Congamond Lakes	Hartford	D	-	-	60
13	Lower Spectacle Pond	Berkshire	D	-	-	56
14	Pequot Pond	Hampden	D	-	-	63
15	Muddy Brook Lake	Worcester	D	-	-	56
16	Robbins Pond	Worcester	D	-	-	59
17	Stodge Meadow Pond	Worcester	D	-	-	52
18	Stiles Pond	Essex	D	-	-	55
19	Little Chauncy Pond	Worcester	D	-	-	64
20	Upper Artichoke Reservoir	Essex	D	-	-	64
21	Heart Pond	Middlesex	D	-	-	57
22	Boons Pond	Middlesex	D	-	-	53
23	Cleveland Pond	Plymouth	D	-	-	58
24	Ten Mile River Lake	Bristol	D	-	-	60
25	Ames Long Pond	Bristol	D	-	-	52
26	Horn Pond	Middlesex	D	-	-	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.