What is the cleanest lake in Manicouagan County, Québec?

Lac Donlon in Manicouagan County is the cleanest lake on the readings in Manicouagan County, Québec with an EPA water-quality readings of — and 6.9 feet of water clarity.

How are these rankings calculated?

Nutrients and algae, total phosphorus, nitrogen, chlorophyll-a and turbidity, are read against EPA National Lakes Assessment 2022 condition classes for that lake’s ecoregion. Water clarity (Secchi depth) is measured and shown; it is not the letter. Lakes without enough recent samples are UNRATED, not given an F. Source data comes from the EPA Water Quality Portal.

Cleanest Lakes in Manicouagan County, Québec

Lac Donlon in Manicouagan County leads the rankings on measured clarity and nutrients and 6.9 ft of clarity. Below are the top 17 cleanest monitored lakes in Manicouagan County, Québec, ranked by EPA water quality score.

Ranked List

#	Lake	County	Clarity	Phosphorus	Algae
1	Lac Donlon	Manicouagan	—	6.9 ft	6.2 µg/L	1.9 µg/L
2	Lac ThéRèSe	Manicouagan	—	8.2 ft	5.1 µg/L	2.1 µg/L
3	Lac Cinq Cents	Manicouagan	—	4.4 ft	18.8 µg/L	7.1 µg/L
4	Lac Saint-Joseph	Manicouagan	—	9.5 ft	7.5 µg/L	2.6 µg/L
5	Lac Taillardat	Manicouagan	—	9.2 ft	7.1 µg/L	3.1 µg/L
6	Lac Migneault	Manicouagan	—	10.5 ft	4.9 µg/L	2.8 µg/L
7	Lac Rond	Manicouagan	—	13.8 ft	2.8 µg/L	1.3 µg/L
8	Lac Couillard	Manicouagan	—	6.7 ft	7.1 µg/L	2.4 µg/L
9	Lac Frigon	Manicouagan	—	10.5 ft	3.5 µg/L	1.6 µg/L
10	Lac Denise	Manicouagan	—	6.6 ft	6.9 µg/L	2.5 µg/L
11	Lac Petit Bras	Manicouagan	—	7.2 ft	9 µg/L	3.4 µg/L
12	Lac Fer à Cheval	Manicouagan	—	6.6 ft	9.1 µg/L	3.1 µg/L
13	Lac la Chesnaye	Manicouagan	—	7.1 ft	7.4 µg/L	3.1 µg/L
14	Lac Blanc	Manicouagan	—	18.4 ft	1.9 µg/L	1 µg/L
15	Lac Potvin	Manicouagan	—	4.1 ft	5.4 µg/L	1.6 µg/L
16	Lac Pascal	Manicouagan	—	9 ft	5 µg/L	1.6 µg/L
17	Lac à la Loutre	Manicouagan	—	10.2 ft	7.5 µg/L	1.8 µg/L

Ranked List

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