What are eutrophic lakes in Utah?

25 eutrophic lakes in Utah. High nutrients, frequent algae, reduced clarity.

What does eutrophic mean?

High nutrients, frequent algae, reduced clarity.

Eutrophic Lakes in Utah

Eutrophic lakes — TSI 50 to 70 — are nutrient-rich and productive, with persistent summer algal communities that drive visible reductions in clarity. These conditions are not failures; they reflect a lake doing what nutrient-loaded waters do. 25 Utah 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	Lake Powell Goodhope Bay Midchannel	Garfield	B	6.1 ft	-	51
2	Beaver Meadow Reservoir	Summit	B	4.6 ft	-	50
3	Newcastle Reservoir	Iron	C	9.5 ft	-	60
4	Willard Bay Reservoir	Box Elder	C	2.3 ft	-	59
5	Gunnison Reservoir	Sanpete	C	0.8 ft	-	68
6	Bear R Bay Outflow Lake	Weber	C	-	-	67
7	Gsl Farmington Bay Outflow Lake	Davis	D	1 ft	-	78
8	Lower Bowns Reservoir	Garfield	D	9.2 ft	-	51
9	Cutler Reservoir	Cache	D	1.2 ft	-	68
10	Big East Lake	Utah	D	7.7 ft	-	53
11	Johnson Reservoir	Sevier	D	2 ft	-	66
12	Mill Meadow Reservoir	Wayne	D	5.9 ft	-	59
13	Scofield Reservoir	Carbon	D	12.5 ft	-	48
14	Piute Reservoir	Piute	D	1 ft	-	62
15	Redmond Lake	Sevier	D	0.7 ft	-	70
16	Otter Creek Reservoir	Piute	D	5.2 ft	-	54
17	Whitney Reservoir	Summit	D	17.7 ft	-	45
18	Woodruff Creek Reservoir	Rich	D	11.5 ft	-	50
19	Baker Dam Reservoir	Washington	D	3.6 ft	-	63
20	Hoop Lake	Summit	D	5.6 ft	-	56
21	Panguitch L Shore Lake	Garfield	D	5.7 ft	-	61
22	Matt Warner Reservoir E	Uintah	D	6.2 ft	-	58
23	Birch Creek Reservoir	Rich	D	7.4 ft	-	54
24	Willard Pond West End	Box Elder	D	4.3 ft	-	65
25	Willard Pond East End	Box Elder	D	6.4 ft	-	62

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 →Washington version →Wyoming version →Georgia version →Massachusetts version →Ontario version →Québec version →Nova Scotia version →British Columbia version →Newfoundland and Labrador version →All Utah lakes →

Source: EPA National Aquatic Resource Surveys, 2026.