Eutrophic Lakes: High Nutrient Lakes

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. 100 the United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs. LakeQuality covers lakes register as eutrophic. Only 10% are deep — eutrophy correlates with shallowness, agricultural watersheds, and the kind of nutrient-input history that takes decades to shift.

Eutrophic lakes typically carry higher phosphorus and chlorophyll-a readings. The same nutrient richness that defines the trophic class shows up in those numbers.

Lake	County	State	Clarity	Depth
South Sturgeon Lake	St. Louis	MN	2.5 ft	43 ft
Schram Lake	Beltrami	MN	3.9 ft	-
Colby Lake	St. Louis	MN	3 ft	30 ft
Jessie Lake	Beltrami	MN	4.6 ft	35 ft
East Twin Lake	St. Louis	MN	2.8 ft	-
Howard Lake	Anoka	MN	3.3 ft	-
Elbow Lake	Cook	MN	3.7 ft	9 ft
Lost Lake	Hennepin	MN	3.2 ft	6 ft
Sabin Lake	St. Louis	MN	2.1 ft	52 ft
Nichols Lake	St. Louis	MN	5.1 ft	31 ft
Isabella Lake	Lake	MN	4.4 ft	19 ft
Grass Lake	Anoka	MN	4.3 ft	-
Silver Island Lake	Lake	MN	4.4 ft	16 ft
Gaslyn Lake	Burnett	WI	4.5 ft	12 ft
Lake St Croix	Pierce	MN	7.2 ft	78 ft
Third Crow Wing Lake	Hubbard	MN	2.5 ft	35 ft
Badger Lake	Polk	MN	6.6 ft	19 ft
Sarah Lake	Polk	MN	7.7 ft	27 ft
Pool	Washington	MN	5.9 ft	78 ft
Shoepack Lake	St. Louis	MN	4.6 ft	24 ft
Kittleson Lake	Polk	MN	7.1 ft	-
O'Connors Lake	Washington	MN	6.6 ft	-
Potter Lake	Walworth	WI	4.3 ft	26 ft
Lake St Croix	St. Croix	WI	5.6 ft	60 ft
Boulder Lake	Vilas	WI	5.6 ft	23 ft
Pickerel Lake	Vilas	WI	6 ft	26 ft
Round Lake	Oneida	WI	4.4 ft	15 ft
Rice Lake	Iron	WI	5 ft	21 ft
Long Lake	Shawano	WI	6 ft	35 ft
Nelson Lake	Sawyer	WI	5 ft	-
Rush Lake	Vilas	WI	5 ft	7 ft
Rush Lake	Winnebago	WI	3.2 ft	5 ft
North Lake	Barron	WI	5.5 ft	21 ft
Crescent Lake	Polk	WI	4.5 ft	43 ft
Red Cedar Lake	Jefferson	WI	4 ft	6 ft
Wolf Lake	Fond du Lac	WI	5 ft	47 ft
Bark Lake	Washington	WI	5.5 ft	34 ft
Mud Lake	Polk	WI	4.3 ft	15 ft
Loon Lake	Shawano	WI	5.5 ft	22 ft
Big Arbor Vitae Lake	Vilas	WI	6 ft	41 ft
Bearskin Lake	Oneida	WI	6 ft	26 ft
White Lake	Waupaca	WI	5.6 ft	10 ft
Hartlaub Lake	Manitowoc	WI	5 ft	60 ft
Lake Esadore	Taylor	WI	4.5 ft	36 ft
Amnicon Lake	Douglas	WI	5 ft	31 ft
Eagle Spring Lake	Waukesha	WI	4.5 ft	8 ft
Ward Lake	Polk	WI	6 ft	43 ft
Druid Lake	Washington	WI	5.5 ft	53 ft
Whitewater Lake	Walworth	WI	4 ft	35 ft
Big Dardis Lake	Price	WI	5.5 ft	-
Lake Waubesa	Dane	WI	3.2 ft	38 ft
School Section Lake	Waukesha	WI	6.2 ft	8 ft
School Section Lake	Waupaca	WI	6.5 ft	38 ft
Friess Lake	Washington	WI	4 ft	48 ft
Wood Lake	Burnett	WI	5.5 ft	35 ft
Horseshoe Lake	Manitowoc	WI	6.5 ft	54 ft
Deep Hole Lake	Oneida	WI	4.3 ft	-
East Twin Lake	Marquette	WI	3.3 ft	8 ft
Random Lake	Sheboygan	WI	4.5 ft	22.2 ft
Big Stone Lake	Oneida	WI	4.2 ft	57 ft
Blue Spring Lake	Jefferson	WI	6.2 ft	27 ft
Lake Sherwood	Adams	WI	5.5 ft	27 ft
George Lake	Oneida	WI	5 ft	26 ft
Spur Lake	Oneida	WI	2 ft	3 ft
Hiawatha Lake	Vilas	WI	4 ft	58 ft
Lake Thompson	Oneida	WI	4 ft	30 ft
Shoe Lake	Manitowoc	WI	7 ft	34 ft
Clarey Lake	Polk	WI	4.3 ft	49 ft
Van Zile Lake	Forest	WI	5.4 ft	17 ft
Black Hawk Lake	Iowa	WI	5 ft	42 ft
Granite Lake at	Barron	WI	6 ft	34 ft
Tichigan Lake	Racine	WI	5.5 ft	63 ft
Quarry Lake	Brown	WI	8 ft	-
Unnamed Lake	Polk	WI	5 ft	-
Red Bass Lake	Vilas	WI	3.4 ft	22 ft
Lake Wingra	Dane	WI	4 ft	14 ft
Bakkens Pond	Sauk	WI	2.5 ft	-
Arkdale Lake	Adams	WI	5 ft	10.5 ft
Patrick Lake	Adams	WI	5 ft	21 ft
Oneida Lake	Oneida	WI	5.5 ft	34 ft
Dunes Lake	Door	WI	4 ft	1 ft
Kaine Lake	Forest	WI	3.2 ft	-
Axehead Lake	Cook	IL	11.9 ft	-
Boulder South Lake	Perry	IL	8.8 ft	-
Wampum Lake	Cook	IL	6.9 ft	-
Shabbona Lake	DeKalb	IL	4.9 ft	-
Big Rock Lake	Kane	IL	8.1 ft	-
Round Lake	Lake	IL	7.4 ft	-
Channel Lake	Lake	IL	8 ft	-
Zurich Lake	Lake	IL	-	-
West Loon Lake	Lake	IL	-	-
Little Africa Lake	Gogebic	MI	3 ft	-
Storm Lake Max Depth	Buena Vista	IA	1.7 ft	-
Arrowhead Lake	Sac	IA	5.6 ft	-
Kent Park Lake	Johnson	IA	4.8 ft	-
Mariposa Lake	Jasper	IA	5.1 ft	-
Mormon Trail Lake	Adair	IA	6.2 ft	-
Newell Pit Lake	Buena Vista	IA	4.1 ft	-
Bob White Lake	Wayne	IA	0.6 ft	-
Willow Lake	Harrison	IA	4.8 ft	-

Frequently Asked Questions

What is an eutrophic lake?

High nutrients, frequent algae, reduced clarity. There are 100 eutrophic lakes across the United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs. LakeQuality covers, representing 6% of all measured lakes.