What are eutrophic lakes in Nebraska?

20 eutrophic lakes in Nebraska. High nutrients, frequent algae, reduced clarity.

What does eutrophic mean?

High nutrients, frequent algae, reduced clarity.

Eutrophic Lakes in Nebraska

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. 20 Nebraska 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	Calamus Reservoir	Garfield	B	3.6 ft	-	65
2	Cub Creek Lake	Keya Paha	B	4.9 ft	-	55
3	Lake Maloney	Lincoln	B	2.1 ft	-	60
4	Oliver Reservoir	Kimball	B	1.7 ft	-	62
5	Chalkrock Lake	Cedar	B	3.3 ft	-	56
6	Skyview Lake	Madison	B	6.2 ft	-	52
7	Lake Whitney	Dawes	B	0.5 ft	-	69
8	Swanson Reservoir	Hitchcock	B	2.6 ft	-	61
9	Harry Strunk Lake	Frontier	C	2.5 ft	-	61
10	Kramper Lake	Dakota	C	4.5 ft	-	57
11	Kirkman'S Cove Lake	Richardson	D	1.4 ft	-	69
12	Enders Reservoir	Chase	D	2.8 ft	-	59
13	Johnson Lake	Gosper	D	2.8 ft	-	60
14	Harlan County Reservoir	Harlan	D	2.8 ft	-	66
15	Jenny Newman Lake	Cass	D	5.4 ft	-	60
16	Lake Wanahoo	Saunders	D	2.4 ft	-	66
17	Powder Creek Lake	Dixon	D	2.7 ft	-	63
18	Prairie Queen Lake	Sarpy	D	3.3 ft	-	60
19	Lake Ogallala	Keith	D	4.9 ft	-	57
20	Oxbow Trails Reservoir	Butler	D	1.3 ft	-	76

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 →Oklahoma version →Kansas 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 Nebraska lakes →

Source: EPA National Aquatic Resource Surveys, 2026.