What is the cleanest lake in Oklahoma?

Lake Texoma in Grayson County has the cleanest nutrient and algae readings in Oklahoma, with 4.2 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 Oklahoma

Lake Texoma in Grayson County leads the rankings on measured clarity and nutrients and 4.2 ft of clarity. Below are the top 6 cleanest monitored lakes in Oklahoma, ranked on EPA nutrient and algae measurements.

Ranked List

#	Lake	County	Clarity	Phosphorus	Algae
1	Lake Texoma	Grayson	4.2 ft	36 µg/L	13 µg/L
2	Grand Lake	Delaware	1.6 ft	720 µg/L	-
3	Wes Watkins Reservoir	Pottawatomie	1.8 ft	32 µg/L	18.2 µg/L
4	Lake Nahni Waiya Tuskahomma	Pushmataha	-	250 µg/L	-
5	Lake Sardis Clayton	Pushmataha	-	260 µg/L	-
6	Lake Hugo Hugo	Choctaw	-	430 µg/L	-

Ranked List

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