Eutrophic Lakes in Québec

69 eutrophic lakes in Québec. High nutrients, frequent algae, reduced clarity.

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. 69 Québec 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 the LakeGrade rubric. The same nutrient richness that defines the trophic class drives the lower grade.

#	Lake	County	Grade	Clarity	Depth	TSI
1	Lac Baxter	La Nouvelle-Beauce	B	3.6 ft	-	52
2	Lac Opasatica	Abitibi-Témiscamingue	B	3.9 ft	-	50
3	Lac Saint-FrançOis	La Rivière-du-Nord	B	5.2 ft	-	50
4	Lac Victor	Les Pays-d'en-Haut	B	3.9 ft	-	51
5	Lac Caribou	Les Appalaches	B	3.6 ft	-	52
6	Lac Graham	Argenteuil	B	4.6 ft	-	51
7	Lac Lewis	D'Autray	B	6.7 ft	-	51
8	Lac Cinq Cents	Manicouagan	B	4.4 ft	-	51
9	Lac Denison	Le Val-Saint-François	C	5.2 ft	-	50
10	Lac Pierre-Paul	Mékinac	C	5.9 ft	-	50
11	Lac MéNard	Les Laurentides	C	3.8 ft	-	52
12	RéServoir ChoinièRe	La Haute-Yamaska	C	5.6 ft	-	52
13	Lac du Village	Urban agglomeration of Longueuil	C	8.2 ft	-	50
14	Lac Arbour	Matawinie	C	4.3 ft	-	53
15	Lac Schryer	Les Pays-d'en-Haut	C	4.1 ft	-	54
16	Lac des Chicots	Mékinac	C	4.9 ft	-	52
17	Lac Johanne	Les Pays-d'en-Haut	C	3.4 ft	-	54
18	Lac Boivin	La Haute-Yamaska	C	7.5 ft	-	53
19	Lac Rouyn	Abitibi-Témiscamingue	C	8.2 ft	-	52
20	Lac Aux Grelots	Beauce-Sartigan	C	4.3 ft	-	53
21	Petit Lac Dufresnoy	Abitibi-Témiscamingue	C	3.3 ft	-	51
22	Lac de Saint-Damase	La Matapédia	C	4.6 ft	-	53
23	Lac Michaud	La Matapédia	C	5.2 ft	-	52
24	Lac Bolduc	Les Appalaches	C	4.1 ft	-	53
25	Lac Frederic	Argenteuil	C	5.6 ft	-	51
26	Lac Bibeau	Matawinie	C	4.3 ft	-	53
27	Lac Joseph	L'Érable	C	4.9 ft	-	51
28	Lac la Motte	Abitibi	C	2.3 ft	-	52
29	Lac William	L'Érable	C	6.2 ft	-	50
30	Lac à France	Beauce-Sartigan	C	4.6 ft	-	53
31	Lac Algonquin	Les Etchemins	C	3 ft	-	55
32	Lac Paquette	Les Laurentides	C	3.3 ft	-	54
33	Lac Clovis	Argenteuil	C	4.9 ft	-	52
34	Lac Noranda	Abitibi-Témiscamingue	C	3.9 ft	-	55
35	Lac Isidore	L'Islet	C	3 ft	-	53
36	Les Trois Lacs	Arthabaska	C	4.6 ft	-	53
37	Lac Dufresnoy	Abitibi-Témiscamingue	C	2.3 ft	-	55
38	Lac PréVost	Témiscamingue	C	4.3 ft	-	55
39	Lac Rond	Les Appalaches	C	3.3 ft	-	54
40	Lac Matissard	Abitibi-Témiscamingue	C	3.3 ft	-	52
41	Lac LoïS	Abitibi-Témiscamingue	C	3.1 ft	-	52
42	Lac Davy	Abitibi	C	2.3 ft	-	54
43	Lac Beaver	La Rivière-du-Nord	C	3.6 ft	-	54
44	Lac Hamelin	D'Autray	C	3 ft	-	54
45	Lac Gervais	Matawinie	C	4.6 ft	-	53
46	Lac BéCancour	Les Appalaches	C	3.3 ft	-	54
47	Lac Malartic	La Vallée-de-l'Or	C	1.5 ft	-	57
48	Lac Beaumont	Bellechasse	C	3 ft	-	54
49	Lac Noir	Les Appalaches	C	3.6 ft	-	56
50	Lac Bill	Maskinongé	C	4.3 ft	-	55
51	Lac Caron	Les Pays-d'en-Haut	C	3.8 ft	-	56
52	Lac Pelletier	Abitibi-Témiscamingue	C	7.5 ft	-	55
53	Lac de Montigny	La Vallée-de-l'Or	C	2 ft	-	57
54	Lac Hervé	Abitibi-Témiscamingue	C	1.6 ft	-	61
55	Lac Rose	Bécancour	C	3.6 ft	-	57
56	Lac Waterloo	La Haute-Yamaska	D	4.3 ft	-	57
57	Lac Mandeville	D'Autray	D	3.9 ft	-	58
58	Lac Abitibi	Abitibi-Ouest	D	0.7 ft	-	66
59	Lac Aux Canards	Bellechasse	D	2.6 ft	-	59
60	Lac Vert	Le Fjord-du-Saguenay	D	2 ft	-	60
61	Lac Lindsay	Coaticook	D	3.9 ft	-	59
62	Lac de la Belle Montagne	Matawinie	D	3.9 ft	-	58
63	Lac Roxton	La Haute-Yamaska	D	3.8 ft	-	62
64	Lac Macamic	Abitibi-Ouest	D	0.7 ft	-	67
65	Lac BrûLé	Charlevoix-Est	D	5.2 ft	-	53
66	Lac Saint-Augustin	Urban agglomeration of Québec	D	5.1 ft	-	54
67	Lac à la Truite	Les Appalaches	D	3 ft	-	61
68	Lac à Vaillancourt	Rimouski-Neigette	D	4.9 ft	-	63
69	Grand Lac MalobèS	Rimouski-Neigette	F	2.6 ft	-	63

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 →Nebraska 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 →All Québec lakes →

Source: EPA National Aquatic Resource Surveys, 2026.