Hypereutrophic Lakes in Tennessee

23 hypereutrophic lakes in Tennessee. Very high nutrients, dense algae, poor clarity.

Hypereutrophic lakes (TSI above 70) are at the upper end of the productivity scale: visible algal blooms most weeks of summer, clarity often under 3 feet, and meaningful risk of harmful-algal-bloom toxin events. 23 hypereutrophic lakes are on the {{stateName}} books. Almost none of them are deep — 0% break 50 feet. Shallow basin plus heavy nutrient input is the consistent recipe.

Hypereutrophic lakes overwhelmingly grade D or F — the trophic class and the grade are measuring closely-related dimensions of the same underlying nutrient regime.

#	Lake	County	Grade	Clarity	Depth	TSI
1	Nla Lake	Polk	C	16.4 ft	-	74
2	Nla Lake	Sullivan	C	10.3 ft	-	77
3	Nla Lake	Madison	D	3.4 ft	-	92
4	Nla Lake	Hardeman	D	2.2 ft	-	95
5	Nla Lake	McNairy	D	2.4 ft	-	94
6	Nla Lake	Putnam	D	1.6 ft	-	104
7	Nla Lake	Davidson	D	2.2 ft	-	93
8	Nla Lake	Maury	F	1.5 ft	-	79
9	Nla Lake	Bedford	F	1.1 ft	-	82
10	Nla Lake	Shelby	F	2 ft	-	104
11	Otter Creek Lake	Davidson	F	-	-	74
12	Duck River Lake	Humphreys	F	-	-	81
13	Reelfoot Lake Blue Basin	Lake	F	-	-	83
14	Reelfoot Lake Upper Blue Basin	Obion	F	-	-	86
15	Reelfoot Lake-Reelfoot Creek Embayment	Obion	F	-	-	80
16	Mckellar Lake Habor Channel	Shelby	F	-	-	77
17	Mckellar Lake Inlet	Shelby	F	-	-	75
18	Cypress Creek South Lake	Shelby	F	-	-	84
19	Drakes Creek Lake	Sumner	F	-	-	79
20	Lost Creek Embayment Lake	Moore	F	-	-	95
21	Reelfoot Lake	Lake	F	-	-	91
22	Little Terrapin Branch Unnamed Tributary Impoundment Lake	Maury	F	-	-	87
23	Swafford Pond	Bledsoe	F	-	-	91

All hypereutrophic 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 →Oklahoma version →Kansas version →Nebraska version →Nevada version →Arizona version →Idaho version →Montana version →New Mexico version →Alabama version →Virginia version →Kentucky version →Utah version →Washington version →Wyoming version →All Tennessee lakes →

Source: EPA National Aquatic Resource Surveys, 2026.