What is the cleanest lake in Utah?

Flaming Gorge Reservoir in Daggett County has the cleanest nutrient and algae readings in Utah, with 31.8 feet of measured water clarity.

How are these rankings calculated?

Nutrients and algae, total phosphorus, nitrogen, chlorophyll-a and turbidity, are read against EPA National Lakes Assessment 2022 condition classes for that lake’s ecoregion. Water clarity (Secchi depth) is measured and shown separately. Lakes without enough recent samples are listed without a condition class rather than ranked low. Source data comes from the EPA Water Quality Portal.

Cleanest Lakes in Utah

Flaming Gorge Reservoir in Daggett County leads the rankings on measured clarity and nutrients and 31.8 ft of clarity. Below are the top 24 cleanest monitored lakes in Utah, ranked on EPA nutrient and algae measurements.

Ranked List

#	Lake	County	Clarity	Phosphorus	Algae
1	Flaming Gorge Reservoir	Daggett	31.8 ft	6.8 µg/L	1 µg/L
2	Wide Hollow Reservoir	Garfield	13.8 ft	36.5 µg/L	3.4 µg/L
3	Starvation Reservoir	Duchesne	11.2 ft	10 µg/L	1.4 µg/L
4	Recapture Reservoir	San Juan	8.9 ft	15.1 µg/L	1.7 µg/L
5	Red Fleet Reservoir	Uintah	5.9 ft	20 µg/L	1.8 µg/L
6	Newton Reservoir	Cache	15.4 ft	26 µg/L	1.7 µg/L
7	Hyrum Reservoir	Cache	6.9 ft	17.9 µg/L	2.2 µg/L
8	Moon Lake	Duchesne	9.5 ft	11.2 µg/L	2.7 µg/L
9	Lake Powell Off Cha Canyon	San Juan	13.1 ft	9.4 µg/L	-
10	Lake Powell Goodhope Bay Midchannel	Garfield	6.1 ft	26 µg/L	-
11	Lake Powell Off Davis Gulch	Kane	15.4 ft	13.1 µg/L	-
12	Lake Powell Halls Xing	Kane	12.3 ft	15.9 µg/L	-
13	Jordanelle Reservoir	Wasatch	8.2 ft	20 µg/L	1.9 µg/L
14	Mona Reservoir	Juab	2 ft	53.5 µg/L	4.3 µg/L
15	Strawberry Reservoir Bryants Fk T	Wasatch	15.6 ft	20 µg/L	2 µg/L
16	Porcupine Reservoir	Cache	8.5 ft	13.3 µg/L	3.8 µg/L
17	Willard Bay Reservoir	Box Elder	2.3 ft	55 µg/L	7.9 µg/L
18	Gsl Farmington Bay Outflow Lake	Davis	1 ft	484.5 µg/L	27.8 µg/L
19	Lower Bowns Reservoir	Garfield	9.2 ft	34 µg/L	9 µg/L
20	Cutler Reservoir	Cache	1.2 ft	109 µg/L	17.4 µg/L
21	Mill Meadow Reservoir	Wayne	5.9 ft	66 µg/L	22.7 µg/L
22	Baker Dam Reservoir	Washington	3.6 ft	78 µg/L	29.5 µg/L
23	Matt Warner Reservoir E	Uintah	6.2 ft	72 µg/L	15.2 µg/L
24	Farmington Bay Lake	Davis	-	405 µg/L	106 µg/L

Ranked List

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