What is the cleanest lake in Utah?

Flaming Gorge Reservoir Antelope Flat in Daggett County has the cleanest nutrient and algae readings in Utah, with 25.3 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.

Best Lakes to Swim In in Utah

9 lakes in Utah lead the swimming list on clear, low-nutrient water with chlorophyll-a (algae) under 10 µg/L. Always check local advisories on the day you swim.

Ranked List

#	Lake	County	Clarity	Phosphorus	Algae
1	Flaming Gorge Reservoir Antelope Flat	Daggett	25.3 ft	6.5 µg/L	1 µg/L
2	Flaming Gorge Reservoir	Daggett	31.8 ft	6.8 µg/L	1 µg/L
3	Wide Hollow Reservoir	Garfield	13.8 ft	36.5 µg/L	3.4 µg/L
4	Starvation Reservoir	Duchesne	11.2 ft	10 µg/L	1.4 µg/L
5	Recapture Reservoir	San Juan	8.9 ft	15.1 µg/L	1.7 µg/L
6	Red Fleet Reservoir	Uintah	5.9 ft	20 µg/L	1.8 µg/L
7	Newton Reservoir	Cache	15.4 ft	26 µg/L	1.7 µg/L
8	Hyrum Reservoir	Cache	6.9 ft	17.9 µg/L	2.2 µg/L
9	Moon Lake	Duchesne	9.5 ft	11.2 µg/L	2.7 µg/L

Ranked List

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