Is Lac Denise safe to swim in?

Good for swimming, clear water with low algae levels. Lac Denise has an overall water quality grade of B. Algae concentration (chlorophyll-a) is 2.5 µg/L. Always check local health department advisories before swimming.

Manicouagan County, Québec · Water Quality Report Card

Lac Denise

Grade B — Good

Mesotrophic

Lac Denise in Manicouagan, Québec received a water quality grade of B (Good). Water clarity: 2 m visibility. Phosphorus: 6.9 µg/L. Chlorophyll-a (algae): 2.5 µg/L.

Clarity: 2 m
Type: Mesotrophic

Where to stay →Safe to swim?

Lac Denise is a mesotrophic lake in Manicouagan County, Québec. Water quality is graded B based on 3 sampling years through 2021. Compared to the 16 other monitored lakes in Manicouagan County, Lac Denise ranks #14 for water quality.

Source: EPA Water Quality Portal sampling records, MELCCFP, last sampled 2021-08-01. Grade methodology: LakeGrade methodology.

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Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Murky, only visible to about 6.6 ft. Phosphorus level: 6.9 µg/L. Chlorophyll-a: 2.5 µg/L. Trophic State Index: 41.

Metric	Value	Grade
Water Clarity (Secchi Depth)	2 m	D
Phosphorus	6.9 µg/L	A
Chlorophyll-a (Algae)	2.5 µg/L	A
Trophic State Index (TSI)	41	Mesotrophic

Moderate nutrients, good water quality

Where to stay near Lac Denise

Compare lakeside cabins, hotels, and vacation rentals near Lac Denise in Manicouagan, Québec — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.

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Fishing Lac Denise

→ Lac Denise fishing regulations (limits, seasons, special rules)

Location

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County Ranking

Ranked #14 of 17 lakes in Manicouagan

Cleaner Lakes Within 30 Miles

Lac Denise holds Grade B. 5 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Manicouagan

Explore Lac Denise across LakeGrade

Lake Fishing Forecast

Species activity outlook by water temperature and season

Mesotrophic Lakes

Moderate nutrients, good water quality

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Grade A/B + low algae filter

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Other Grade B Lakes in Québec

Lac du Gros Ruisseau

La Mitis · 3.4 m

Lac des ÎLes

La Matanie · 1.8 m

Lac à L'Anguille

Rimouski-Neigette · 2.5 m

Lac Neigette

Rimouski-Neigette · 3.2 m

Lac Plourde

Rimouski-Neigette · 3.5 m

Lac à la Truite

Rimouski-Neigette · 2.2 m

Mesotrophic Lakes in Québec

Lac du Gros Ruisseau Lac des ÎLes Lac à L'Anguille Lac à Gasse

More records, surveys & data sources

Where this data comes from

Measurements for Lac Denise come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.

Data Sources

Water quality data from the EPA Water Quality Portal

Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion

Most recent sample: 2021-08-01

Monitoring stations:

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