Question 1

Cleanest Lakes in Cache County, Utah?

Accepted Answer

Newton Reservoir in Cache County leads the rankings on measured clarity and nutrients and 15.4 ft of clarity. Below are the top 4 cleanest monitored lakes in Cache County, Utah, ranked on EPA nutrient and algae measurements.

Question 2

What is the cleanest lake in Cache County, Utah?

Accepted Answer

Newton Reservoir in Cache County has the cleanest nutrient and algae readings in Cache County, Utah, with 15.4 feet of measured water clarity.

Question 3

How are these rankings calculated?

Accepted Answer

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.

#	Lake	County	Clarity	Phosphorus	Algae
1	Newton Reservoir	Cache	15.4 ft	26 µg/L	1.7 µg/L
2	Hyrum Reservoir	Cache	6.9 ft	17.9 µg/L	2.2 µg/L
3	Porcupine Reservoir	Cache	8.5 ft	13.3 µg/L	3.8 µg/L
4	Cutler Reservoir	Cache	1.2 ft	109 µg/L	17.4 µg/L

Cleanest Lakes in Cache County, Utah

Ranked List

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