Oligotrophic Lakes in Utah

57 oligotrophic lakes in Utah. Low nutrients, clear water, excellent for swimming.

An oligotrophic lake is what most people picture when they think of pristine northern lake country: clarity to depth, no algal scum, cold water that holds dissolved oxygen all the way to the bottom even in August. Across {{stateName}}, 57 lakes register as oligotrophic — 0% of them break 50 feet of depth, which is the structural condition that underwrites the trophic class. Without depth and a low-nutrient watershed, oligotrophy is hard to sustain.

On the LakeGrade rubric, oligotrophic lakes almost always pull an A or B — the same low-nutrient conditions that produce the trophic class also produce the high grade.

#	Lake	County	Grade	Clarity	Depth	TSI
1	Flaming Gorge Reservoir Antelope Flat	Daggett	A	25.3 ft	-	29
2	Flaming Gorge Lake	Daggett	A	29.5 ft	-	28
3	Flaming Gorge Reservoir	Daggett	A	31.8 ft	-	27
4	Lake Powell Off Davis Gulch	Kane	A	15.4 ft	-	38
5	Nla Lake	Summit	A	17.2 ft	-	35
6	Nla Lake	Duchesne	A	15.9 ft	-	36
7	Nla Lake	Salt Lake	A	20.4 ft	-	34
8	Nla Lake	Sevier	A	33.1 ft	-	31
9	Nla Lake	Garfield	A	-	-	34
10	Nla Lake	Wayne	A	-	-	37
11	Flaming Gorge-Green River Off Antelope Point Lake	Daggett	A	16.6 ft	-	37
12	Flaming Gorge-Green River Lake	Daggett	A	18.9 ft	-	31
13	Flaming Gorge-Green River Lake	Daggett	A	24.3 ft	-	31
14	Strawberry Marina Lake	Wasatch	A	23.6 ft	-	32
15	Bear Lake	Rich	A	21.2 ft	-	33
16	Strawberry Mid Res Lake	Wasatch	A	22 ft	-	33
17	Strawberry Lake	Wasatch	A	20 ft	-	36
18	Lake Mary	Salt Lake	A	26.9 ft	-	30
19	Strawberry Reservoir Bryants Fk T	Wasatch	A	15.6 ft	-	37
20	Newton Reservoir	Cache	A	15.4 ft	-	37
21	Strawberry Reservoir Narrows T	Wasatch	A	17.1 ft	-	36
22	Strawberry Reservoir Strawberry Bay T	Wasatch	A	16.4 ft	-	39
23	Bear Lake Off State Marina	Rich	A	21 ft	-	33
24	Bear Lake	Rich	A	20.7 ft	-	26
25	Lost Creek Reservoir Emap	Morgan	A	15.7 ft	-	37
26	Flaming Gorge-Sheeps Creek Bay Lake	Daggett	A	18.7 ft	-	28
27	Flaming Gorge Lake	Daggett	A	24 ft	-	31
28	Flaming Gorge-Henry'S Fork Lake	Daggett	A	15.1 ft	-	32
29	Lyman Lake	Summit	A	19.7 ft	-	32
30	Flaming Gorge Reservoir Sheep Creek Bay	Daggett	A	19 ft	-	31
31	Ferron Reservoir	Sanpete	A	19 ft	-	31
32	Posey Lake	Garfield	A	16.4 ft	-	35
33	Cleveland Lake	Emery	A	17.4 ft	-	37
34	Newton Reservoir West of Parking Lot	Cache	A	18 ft	-	34
35	Causey Reservoir	Weber	A	15.1 ft	-	37
36	Silver Lake Flat Reservoir Replicate of	Utah	A	16.4 ft	-	34
37	Flaming Gorge Res Antelope Flat Replicate of Lake	Daggett	A	22.6 ft	-	32
38	Clean Lakes Equipment Blank	Salt Lake	A	-	-	37
39	Manning Creek Lake	Piute	A	-	-	37
40	Equipment Blank-Bear Lake And Tributaires Lake Blank	Salt Lake	A	-	-	10
41	Bureau of Reclamation Flaming Gorge Qaqc Blank Lake	Salt Lake	A	-	-	22
42	Nla Lake	Sanpete	A	14.5 ft	-	38
43	Nla Lake	Kane	A	10.7 ft	-	38
44	Nla Lake	Sanpete	A	11.3 ft	-	40
45	Nla Lake	Cache	A	12.5 ft	-	33
46	Starvation Reservoir	Duchesne	A	11.2 ft	-	38
47	Little Dell Reservoir	Salt Lake	A	14.8 ft	-	37
48	Forsyth Reservoir	Sevier	A	13.8 ft	-	37
49	Red Creek Reservoir	Duchesne	A	14.4 ft	-	40
50	Quail Creek Reservoir	Washington	A	14.6 ft	-	34
51	Kolob Reservoir	Washington	A	10.5 ft	-	40
52	Tropic Reservoir	Garfield	A	12.3 ft	-	37
53	Lyman Lake Replicate of	Summit	A	14.1 ft	-	33
54	Deer Creek Upper Res Lake	Wasatch	B	13.4 ft	-	40
55	Little Creek Reservoir	Rich	B	9.8 ft	-	37
56	Paradise Park Reservoir	Uintah	B	7.9 ft	-	35
57	Kolob Reservoir Midway	Washington	B	9.5 ft	-	40

All oligotrophic 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.