Eutrophic Lakes in Utah

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

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. 54 {{stateName}} 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 the LakeGrade rubric. The same nutrient richness that defines the trophic class drives the lower grade.

#	Lake	County	Grade	Clarity	Depth	TSI
1	Nla Lake	Juab	B	3.9 ft	-	51
2	Nla Lake	Iron	B	6.6 ft	-	51
3	Nla Lake	Cache	B	6.7 ft	-	51
4	Gunlock Reservoir Midway	Washington	B	4.6 ft	-	50
5	Beaver Meadow Reservoir	Summit	B	4.6 ft	-	51
6	Nla Lake	Garfield	C	10.9 ft	-	52
7	Nla Lake	Duchesne	C	6.1 ft	-	51
8	Nla Lake	Uintah	C	3.8 ft	-	53
9	Mona Reservoir	Juab	C	2 ft	-	56
10	Matt Warner Reservoir	Uintah	C	6.6 ft	-	50
11	Matt Warner Reservoir W	Uintah	C	6.2 ft	-	52
12	Dmad Reservoir	Millard	C	0.7 ft	-	64
13	Dmad Reservoir N of Cut	Millard	C	0.7 ft	-	64
14	Gunnison Bend Reservoir	Millard	C	1.5 ft	-	58
15	Otter Creek Reservoir	Piute	C	5.2 ft	-	53
16	Minersville Reservoir	Beaver	C	2.6 ft	-	54
17	Birch Creek Reservoir	Rich	C	7.4 ft	-	52
18	Bear R Bay Outflow Lake	Weber	C	-	-	61
19	Nla Lake	Sevier	C	6.5 ft	-	53
20	Nla Lake	Beaver	C	3.7 ft	-	57
21	Nla Lake	Summit	C	5.1 ft	-	55
22	Willard Bay Reservoir	Box Elder	C	2.3 ft	-	58
23	Hoop Lake	Summit	C	5.6 ft	-	54
24	Gunnison Reservoir	Sanpete	C	0.8 ft	-	66
25	Matt Warner Reservoir E	Uintah	C	6.2 ft	-	54
26	Yuba Reservoir	Juab	C	3.9 ft	-	58
27	Lake Powell Goodhope Bay Midchannel	Garfield	D	6.1 ft	-	51
28	Nla Lake	Tooele	D	1.2 ft	-	66
29	Cutler Reservoir	Cache	D	1.2 ft	-	66
30	Newcastle Reservoir Midway	Iron	D	9.2 ft	-	57
31	Mill Meadow Reservoir	Wayne	D	5.9 ft	-	56
32	Lake Canyon Lake	Duchesne	D	5.7 ft	-	52
33	Newcastle Reservoir	Iron	D	9.5 ft	-	60
34	Panguitch Lake	Garfield	D	1.5 ft	-	66
35	Panguitch Lake	Garfield	D	1.5 ft	-	64
36	Piute Reservoir	Piute	D	1 ft	-	66
37	Koosharem Reservoir	Sevier	D	7.2 ft	-	60
38	Baker Dam Reservoir	Washington	D	3.6 ft	-	61
39	East Park Reservoir	Uintah	D	4.6 ft	-	55
40	Willard Bay Reservoir Emap	Box Elder	D	1.1 ft	-	66
41	Panguitch L Shore Lake	Garfield	D	5.7 ft	-	56
42	Cutler Reservoir	Cache	D	1 ft	-	66
43	Willard Pond West End	Box Elder	D	4.3 ft	-	56
44	Willard Pond East End	Box Elder	D	6.4 ft	-	50
45	Great Salt Lake Brb	Box Elder	D	-	-	65
46	Nla Lake	Uintah	D	4.1 ft	-	61
47	Nla Lake	Sevier	D	4.6 ft	-	61
48	Johnson Reservoir	Sevier	D	2 ft	-	66
49	Mantua Reservoir S	Box Elder	D	2.6 ft	-	62
50	Willard West Lake	Box Elder	F	2.3 ft	-	65
51	Willard North Marina Lake	Box Elder	F	1.8 ft	-	68
52	Willard South Marina Lake	Box Elder	F	2.2 ft	-	66
53	Mantua Reservoir	Box Elder	F	3 ft	-	64
54	Yuba Reservoir Midway	Juab	F	2.8 ft	-	64

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 →All Utah lakes →

Source: EPA National Aquatic Resource Surveys, 2026.