Grade D Lakes, Nutrient-rich

1,359 lakes (9% of lakes we track)

Grade D means nutrients and algae are in a poorer EPA condition class for that ecoregion. 1,359 lakes (9% of lakes we track) land here. They remain fishing and cabin destinations — the letter is a nutrient signal, not a stay-or-skip rating.

A B C D F

1,359

Grade D lakes

States in this list

MN 93QC 7

Lake	County	State	Clarity	Depth	Fish
Lac Waterloo	La Haute-Yamaska	QC	4.3 ft	-	0
Lac Mandeville	D'Autray	QC	3.9 ft	-	0
Lac Abitibi	Abitibi-Ouest	QC	0.7 ft	-	0
Lac Aux Canards	Bellechasse	QC	2.6 ft	-	0
Lac Vert	Le Fjord-du-Saguenay	QC	2 ft	-	0
Lac Lindsay	Coaticook	QC	3.9 ft	-	0
Lac de la Belle Montagne	Matawinie	QC	3.9 ft	-	0
Agnes Lake	Douglas	MN	5.4 ft	31 ft	12
Mud Lake	Hennepin	MN	3 ft	-	0
Pelican Lake	Pope	MN	5.2 ft	34 ft	18
Charley Lake	Ramsey	MN	4.6 ft	21 ft	20
Birch Lake	Sherburne	MN	5.8 ft	18 ft	13
Round Lake	Ramsey	MN	8 ft	-	0
Round Lake	Jackson	MN	2 ft	9 ft	17
Pike Lake	Scott	MN	2.3 ft	9 ft	0
Whitefish Lake	Polk	MN	3.9 ft	18 ft	15
Horseshoe Lake	Aitkin	MN	3.5 ft	12 ft	12
Long Lake	Otter Tail	MN	3 ft	-	13
Long Lake	Watonwan	MN	2.5 ft	13 ft	13
Long Lake	Washington	MN	2.8 ft	60 ft	12
Margaret Lake	Cass	MN	5.5 ft	26 ft	17
Unnamed Lake	Hennepin	MN	3.3 ft	-	0
Unnamed Lake	Washington	MN	3 ft	60 ft	12
Unnamed Lake	Scott	MN	2.9 ft	-	0
Maple Lake	Todd	MN	6 ft	23 ft	14
Shallow Pond	Itasca	MN	4.4 ft	14 ft	12
Medicine Lake	Hennepin	MN	7.9 ft	49 ft	15
Twin Lake	Hennepin	MN	5.9 ft	44 ft	13
Twin Lake	Isanti	MN	2.5 ft	-	0
Elms Lake	Isanti	MN	6.5 ft	26 ft	13
Blue Lake	Isanti	MN	8.9 ft	31 ft	13
Eagle Lake	Sherburne	MN	3 ft	18 ft	15
Ballantyne Lake	Blue Earth	MN	2.5 ft	58 ft	16
Sauk Lake	Stearns	MN	3.9 ft	61 ft	18
Zumbro Lake	Olmsted	MN	4 ft	43 ft	24
Johanna Lake	Ramsey	MN	6.6 ft	43 ft	13
Bennett Lake	Ramsey	MN	4.9 ft	9 ft	8
Fish Lake	Scott	MN	3.9 ft	28 ft	14
Fish Lake	Washington	MN	2 ft	-	0
Fish Lake	Washington	MN	6 ft	34 ft	0
Pitts Lake	Dakota	MN	4.9 ft	-	2
Whaletail Lake	Hennepin	MN	3.3 ft	22 ft	13
Beaver Lake	Ramsey	MN	7.7 ft	11 ft	7
Battle Creek Lake	Washington	MN	7.2 ft	15.3 ft	10
Union Lake	Rice	MN	3 ft	10 ft	0
Green Lake	Isanti	MN	4.7 ft	28 ft	15
Island Lake	Ramsey	MN	3.3 ft	-	0
Island Lake	Carlton	MN	5.1 ft	22 ft	14
Moose Lake	Beltrami	MN	3.8 ft	13 ft	12
Volney Lake	Le Sueur	MN	5.5 ft	67 ft	12
Cedar Lake	Carlton	MN	2 ft	-	0
Cedar Lake	Hennepin	MN	4.8 ft	51 ft	15
Emily Lake	Pope	MN	2 ft	6 ft	26
Emily Lake	Crow Wing	MN	3 ft	13 ft	13
Big Pine Lake	Pine	MN	4.6 ft	25 ft	14
Turtle Lake	Polk	MN	3 ft	12 ft	0
Rice Lake	Anoka	MN	2.6 ft	-	0
Rice Lake	Scott	MN	1.7 ft	-	0
Mitchell Lake	Hennepin	MN	3 ft	19 ft	12
Linwood Lake	Anoka	MN	3.9 ft	42 ft	13
Silver Lake	Ramsey	MN	7 ft	18 ft	12
Silver Lake	Hennepin	MN	5.2 ft	-	0
Comfort Lake	Chisago	MN	6 ft	47 ft	15
Goose Lake	Pope	MN	6.1 ft	17 ft	5
Fremont Lake	Sherburne	MN	3 ft	8 ft	0
Little Lake	Chisago	MN	3 ft	23 ft	13
Foot Lake	Kandiyohi	MN	2.3 ft	24 ft	15
Rice Marsh Lake	Hennepin	MN	7.7 ft	-	0
Crystal Lake	Scott	MN	6.8 ft	26 ft	7
Lower Red Lake : East	Beltrami	MN	4 ft	-	0
Ann Lake	Pope	MN	7.2 ft	14 ft	10
Mccoy Lake	Hennepin	MN	2.1 ft	-	0
Jessie Lake	Douglas	MN	6.8 ft	26 ft	15
Pleasant Lake	Ramsey	MN	5.6 ft	58 ft	10
Camp Lake	Wright	MN	4.6 ft	52 ft	10
Goodners Lake	Stearns	MN	5 ft	24 ft	11
Diamond Lake	Kandiyohi	MN	5.6 ft	27 ft	15
Diamond Lake	Hennepin	MN	-	5.8 ft	7
Strand Lake	St. Louis	MN	3.5 ft	16 ft	12
North Turtle Lake	Otter Tail	MN	4 ft	19 ft	12
Independence Lake	Hennepin	MN	4.8 ft	58 ft	17
Crosby Lake	Ramsey	MN	6.6 ft	19 ft	11
Red Rock Lake	Hennepin	MN	2.6 ft	16 ft	9
Oak Lake	Carver	MN	4.5 ft	11 ft	12
Bavaria Lake	Carver	MN	5.1 ft	66 ft	13
Rebecca Lake	Hennepin	MN	4.7 ft	30 ft	11
Krays Lake	Stearns	MN	3.5 ft	40 ft	15
Howard Lake	Wright	MN	4 ft	39 ft	16
Betty Lake	Meeker	MN	5.6 ft	29 ft	15
Briggs Lake	Sherburne	MN	3 ft	25 ft	21
Upper Red Lake: East	Beltrami	MN	2 ft	15 ft	15
South Long Lake	Ramsey	MN	3.9 ft	30 ft	12
Gilchrist Lake	Pope	MN	3.9 ft	24 ft	15
Perch Lake	Lincoln	MN	9.3 ft	16.2 ft	12
Willmar Lake	Kandiyohi	MN	2 ft	14 ft	18
Lower Red Lake : Central	Beltrami	MN	4 ft	-	0
Wood Lake	Yellow Medicine	MN	3 ft	9 ft	11
Hiawatha Lake	Hennepin	MN	3.3 ft	33 ft	12
Wilkinson Lake	Ramsey	MN	3.9 ft	-	0
Lower Twin Lake	Wadena	MN	6.9 ft	26 ft	21

Showing 100 of 1,359 Grade D lakes.

Frequently Asked Questions

How many lakes have a grade of D?

There are 1,359 Grade D (Nutrient-rich) lakes across the 49 states and 2 Canadian provinces LakeQuality covers. That is 9% of the 14,370 lakes we track. Lakes without enough recent nutrient or algae samples are published as Not Rated — they are not in this count and they are not an F.

What does a Grade D mean?

Grade D means nutrients and algae are in a poorer EPA condition class for that ecoregion. Check local advisories before swimming. These lakes are often productive warm-water fisheries, and cabins and rentals around them are listed on each lake page. The letter is a nutrient signal, not a stay-or-skip rating.

Featured Grade D Lakes

Lac Waterloo

La Haute-Yamaska County, QC · 4.3 ft clarity

Lac Mandeville

D'Autray County, QC · 3.9 ft clarity

Lac Abitibi

Abitibi-Ouest County, QC · 0.7 ft clarity

Lac Aux Canards

Bellechasse County, QC · 2.6 ft clarity

Lac Vert

Le Fjord-du-Saguenay County, QC · 2 ft clarity

Lac Lindsay

Coaticook County, QC · 3.9 ft clarity

Source: EPA National Aquatic Resource Surveys, 2026.