Eutrophic Lakes in Oklahoma

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

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. 28 {{stateName}} 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 the LakeGrade rubric. The same nutrient richness that defines the trophic class drives the lower grade.

#	Lake	County	Grade	Clarity	Depth	TSI
1	Nla Lake	Logan	B	2.8 ft	-	56
2	Nla Lake	Osage	B	4.8 ft	-	52
3	Lake Texoma	Grayson	C	4.2 ft	-	56
4	Nla Lake	Osage	C	3.3 ft	-	56
5	Nla Lake	Okmulgee	C	0.4 ft	-	67
6	Nla Lake	Stephens	C	6.1 ft	-	54
7	Greenleaf Lake	Muskogee	C	2.5 ft	-	63
8	Lake Konawa	Seminole	C	3.1 ft	-	61
9	Wes Watkins Reservoir	Pottawatomie	C	1.8 ft	-	61
10	Spavinaw Lake	Mayes	C	3.3 ft	-	59
11	Lake Chickasha	Caddo	C	1.5 ft	-	65
12	Eucha Lake	Delaware	C	3.1 ft	-	60
13	Sportsman Lake	Seminole	C	6.2 ft	-	56
14	Wewoka Lake	Seminole	C	2.5 ft	-	63
15	Thunderbird Lake Hog Creek	Cleveland	C	-	-	57
16	Lake Texoma	Bryan	C	3.2 ft	-	61
17	Lake Thunderbird	Cleveland	C	1.7 ft	-	65
18	Nla Lake	Johnston	C	9.3 ft	-	69
19	Nla Lake	Payne	C	3 ft	-	61
20	Thunderbird Lake Nature Center	Pottawatomie	C	-	-	60
21	Thunderbird Lake Fisherman'S	Cleveland	C	-	-	58
22	Nla Lake	Hughes	D	1.6 ft	-	66
23	Nla Lake	Rogers	D	1.4 ft	-	69
24	Copan Lake	Washington	D	1.6 ft	-	69
25	Ponca Lake A	Kay	D	-	-	68
26	Pioneer Cover Lake	Osage	D	-	-	70
27	Thunderbird Lake Indianhills	Cleveland	D	-	-	65
28	Lake Texoma	Marshall	D	1.7 ft	-	68

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 →All Oklahoma lakes →

Source: EPA National Aquatic Resource Surveys, 2026.