What are eutrophic lakes in Oklahoma?

19 eutrophic lakes in Oklahoma. High nutrients, frequent algae, reduced clarity.

What does eutrophic mean?

High nutrients, frequent algae, reduced clarity.

Eutrophic Lakes in Oklahoma

Eutrophic lakes — TSI 50 to 70 — are nutrient-rich and productive, with persistent summer algal communities that drive visible reductions in clarity. These conditions are not failures; they reflect a lake doing what nutrient-loaded waters do. 19 Oklahoma lakes register as eutrophic. Only 0% are deep — eutrophy correlates with shallowness, agricultural watersheds, and the kind of nutrient-input history that takes decades to shift.

Eutrophic lakes typically grade C or D on our A–F scale. The same nutrient richness that defines the trophic class drives the lower grade.

#	Lake	County	Grade	Clarity	Depth	TSI
1	Lake Texoma	Grayson	C	4.2 ft	-	56
2	Sarge Creek Lake	Kay	C	-	-	69
3	Lake Texoma	Marshall	D	1.7 ft	-	69
4	Lake Thunderbird	Cleveland	D	1.7 ft	-	65
5	Greenleaf Lake	Muskogee	D	2.5 ft	-	62
6	Lake Konawa	Seminole	D	3.1 ft	-	61
7	Wes Watkins Reservoir	Pottawatomie	D	1.8 ft	-	61
8	Spavinaw Lake	Mayes	D	3.3 ft	-	58
9	Copan Lake	Washington	D	1.6 ft	-	69
10	Eucha Lake	Delaware	D	3.1 ft	-	58
11	Sportsman Lake	Seminole	D	6.2 ft	-	56
12	Wewoka Lake	Seminole	D	2.5 ft	-	63
13	Washunga Bay Lake	Kay	D	-	-	72
14	Sandy Beach Lake	Osage	D	-	-	71
15	Coon Creek Lake	Kay	D	-	-	75
16	Osage Cove Lake	Osage	D	-	-	70
17	Pioneer Cover Lake	Osage	D	-	-	70
18	Thunderbird Lake Hog Creek	Cleveland	D	-	-	57
19	Thunderbird Lake Fisherman'S	Cleveland	D	-	-	57

All eutrophic 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 →Kansas version →Nebraska version →Nevada version →Arizona version →Idaho version →Montana version →New Mexico version →Tennessee version →Alabama version →Virginia version →Kentucky version →Utah version →Washington version →Wyoming version →Georgia version →Massachusetts version →Ontario version →Québec version →Nova Scotia version →British Columbia version →Newfoundland and Labrador version →All Oklahoma lakes →

Source: EPA National Aquatic Resource Surveys, 2026.