Syysjärvi is a lake in Mikkeli, Finland. This page reports official water-quality measurements, shown as reported.

Is Syysjärvi safe to swim in?

Syysjärvi has official nutrient and clarity measurements, not a bacteria swim class and not a safety clearance. Algal blooms, currents, and depth are not covered. Always check local notices before swimming.

How deep is Syysjärvi?

Syysjärvi has a maximum depth of 34.4 feet.

Syysjärvi

Mikkeli, FinlandView map Directions

Syke publishes the water-quality measurements for Syysjärvi. Here is what has been measured.

Clarity

3.8 m

Clearer than most

Secchi · sampled 2019

Phosphorus

12.4 µg/L

Typical for Finland

Measured by Syke

Chlorophyll-a

9.7 µg/L

Typical for Finland

Measured by Syke

Max depth

10.5 m

Bathymetric survey

34 ft max depth
Limited data

See the measurements Directions Where to stay

Syysjärvi in Mikkeli, Finland has official water-quality measurements, shown as reported. Water clarity: 3.8 m visibility. Phosphorus: 12.4 µg/L. Chlorophyll-a (algae): 9.7 µg/L. Maximum depth: 34.4 ft.

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How Syysjärvi is classified

Syysjärvi in Finland is published with the authority's own measurements and class. The measurements here are published by the agency that samples the lake, as reported. Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).

LakeQuality publishes no grade of its own beside it. Everything below thathas been measured is reported on this page.

Monitoring: the Finnish Environment Institute (Syke) and the ELY Centres.

Syysjärvi is a lake in Mikkeli County, Finland with a maximum depth of 34 feet.

Source: the Finnish Environment Institute (Syke) and the ELY Centres — not the EPA Water Quality Portal, last sampled 2019-08-13. Methodology: how these readings are compared.

What Syysjärvi is good for

From access and monitoring records, not editorial picks.

Clear water12.5 ft of visibility
Deep water34.4 ft surveyed max depth

Swimming conditions

No reading

Limited data

Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.

Whether Syysjärvi is safe to swim in today is a call for the Finnish Environment Institute (Syke) and the ELY Centres and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

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Water quality measurements for Syysjärvi

These are the measurements Syke publishes for Syysjärvi. More on the source.

Good clarity, visible to about 12.5 ft. Phosphorus 12.4 µg/L. Chlorophyll-a 9.7 µg/L. TSI 45.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	3.8m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	12.4µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	9.7µg/L	Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water.
Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a.	45	Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic

Moderate nutrients, good water quality

Ask about Syysjärvi

Answers come straight from the public measurements and survey records on this page.

Lake Details

Max depth

10.5 m

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Stays near Syysjärvi

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Fishing Syysjärvi

→ Syysjärvi fishing regulations (limits, seasons, special rules)

Frequently asked questions about Syysjärvi

Where is Syysjärvi?: Syysjärvi is a lake in Mikkeli, Finland. This page reports official water-quality measurements, shown as reported.
What is the water quality of Syysjärvi?: Syysjärvi in Mikkeli, Finland has official water-quality measurements, shown as reported. Water clarity: 3.8 m visibility. Phosphorus: 12.4 µg/L. Chlorophyll-a (algae): 9.7 µg/L. Maximum depth: 34.4 ft.
Is Syysjärvi safe to swim in?: Syysjärvi has official nutrient and clarity measurements, not a bacteria swim class and not a safety clearance. Algal blooms, currents, and depth are not covered. Always check local notices before swimming.
How deep is Syysjärvi?: Syysjärvi has a maximum depth of 34.4 feet.

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Where this data comes from

4 measurements from 1 monitoring station, 2019. Retrieved from Syke VESLA (not the EPA Water Quality Portal) on 2026-08-16.

Collected and reported by

Finnish Environment Institute (Syke) and ELY Centressyke-vesla4 samples · 2019

Analytical methods

SYKE VESLA

Monitoring station identifiers (1)

13411

Authority classifications are shown as the authority published them. See where the data comes from and data sources.