Where is Kotkajärvi?

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

Is Kotkajärvi safe to swim in?

Kotkajärvi 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 Kotkajärvi?

Kotkajärvi has a maximum depth of 37.1 feet.

Kotkajärvi

Hämeenlinna, FinlandView map Directions

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

Clarity

2.7 m

Clearer than most

Secchi · sampled 2023

Phosphorus

11 µg/L

Typical for Finland

Measured by Syke

Chlorophyll-a

4.4 µg/L

Less algae than most

Measured by Syke

Max depth

11.3 m

Bathymetric survey

37 ft max depth
Limited data

See the measurements Directions Where to stay

Kotkajärvi in Hämeenlinna, Finland has official water-quality measurements, shown as reported. Water clarity: 2.7 m visibility. Phosphorus: 11 µg/L. Chlorophyll-a (algae): 4.4 µg/L. Maximum depth: 37.1 ft.

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How Kotkajärvi is classified

Kotkajärvi 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.

Kotkajärvi is a lake in Hämeenlinna County, Finland with a maximum depth of 37 feet.

Source: the Finnish Environment Institute (Syke) and the ELY Centres — not the EPA Water Quality Portal, last sampled 2023-08-23. Methodology: how these readings are compared.

What Kotkajärvi is good for

From access and monitoring records, not editorial picks.

Deep water37.1 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 Kotkajärvi 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 Kotkajärvi

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

Moderate clarity, visible to about 8.9 ft. Phosphorus 11 µg/L. Chlorophyll-a 4.4 µg/L. TSI 43.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	2.7m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	11µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	4.4µg/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.	43	Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic

Moderate nutrients, good water quality

Ask about Kotkajärvi

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

Lake Details

Max depth

11.3 m

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Stays near Kotkajärvi

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Fishing Kotkajärvi

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

Frequently asked questions about Kotkajärvi

Where is Kotkajärvi?: Kotkajärvi is a lake in Hämeenlinna, Finland. This page reports official water-quality measurements, shown as reported.
What is the water quality of Kotkajärvi?: Kotkajärvi in Hämeenlinna, Finland has official water-quality measurements, shown as reported. Water clarity: 2.7 m visibility. Phosphorus: 11 µg/L. Chlorophyll-a (algae): 4.4 µg/L. Maximum depth: 37.1 ft.
Is Kotkajärvi safe to swim in?: Kotkajärvi 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 Kotkajärvi?: Kotkajärvi has a maximum depth of 37.1 feet.

Explore Kotkajärvi across LakeQuality

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Species activity outlook by water temperature and season

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EU bathing ratings and named-lake measurements

Where this data comes from

19 measurements from 1 monitoring station, 2017–2023. 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-vesla19 samples · 2017–2023

Analytical methods

SYKE VESLA

Monitoring station identifiers (1)

1806

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