Hypereutrophic Lakes in Arizona

28 hypereutrophic lakes in Arizona. 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. 28 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	Maricopa	C	5.1 ft	-	82
2	Nla Lake	Graham	C	2.8 ft	-	89
3	Nla Lake	Navajo	C	1 ft	-	98
4	Nla Lake	Maricopa	C	9 ft	-	85
5	Nla Lake	Coconino	D	5.7 ft	-	91
6	Nla Lake	La Paz	D	4.9 ft	-	87
7	Rainbow Lake	Navajo	D	1.1 ft	-	70
8	Sunris Park Lake	Yuma	D	-	-	70
9	Nla Lake	Apache	D	5.1 ft	-	70
10	Nla Lake	Yuma	F	0.1 ft	-	128
11	Nla Lake	Coconino	F	2.5 ft	-	76
12	Nla Lake	Coconino	F	0.9 ft	-	84
13	Nla Lake	Apache	F	0.9 ft	-	121
14	Concho Lake	Apache	F	2.5 ft	-	71
15	Green Valley Lake	Gila	F	1.3 ft	-	74
16	Whitehorse Lake	Coconino	F	1.6 ft	-	75
17	Kinnikinick Lake	Coconino	F	0.5 ft	-	84
18	Ashurst Lake	Coconino	F	1.4 ft	-	80
19	Watson Lake	Yavapai	F	-	-	78
20	Lake Mary	Coconino	F	0.3 ft	-	83
21	Kaibab Lake	Coconino	F	0.4 ft	-	84
22	Luna Lake	Apache	F	1.6 ft	-	71
23	Lyman Reservoir	Apache	F	0.3 ft	-	85
24	Topock Marsh Lake	Mohave	F	0.2 ft	-	98
25	Silverbell Lake	Pima	F	0.8 ft	-	75
26	Robinson Reservoir	Mohave	F	-	-	87
27	E Jackson Reservoir	Mohave	F	-	-	91
28	Owl Tank Lake	Coconino	F	-	-	92

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 →Idaho version →Montana version →New Mexico version →Tennessee version →Alabama version →Virginia version →Kentucky version →Utah version →Washington version →Wyoming version →All Arizona lakes →

Source: EPA National Aquatic Resource Surveys, 2026.