Where is Ylimmäinen Raajärvi?

Ylimmäinen Raajärvi is a lake in Mäntyharju, Finland. This page reports official water-quality measurements, shown as reported.

Is Ylimmäinen Raajärvi safe to swim in?

Ylimmäinen Raajärvi 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 Ylimmäinen Raajärvi?

Ylimmäinen Raajärvi has a maximum depth of 16.4 feet.

Ylimmäinen Raajärvi

Mäntyharju, FinlandView map Directions

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

Clarity

1.1 m

Typical for Finland

Secchi · sampled 2024

Phosphorus

20 µg/L

Typical for Finland

Measured by Syke

Chlorophyll-a

27 µg/L

More algae than most

Measured by Syke

Max depth

5 m

Bathymetric survey

16 ft max depth
Limited data

See the measurements Directions Where to stay

Ylimmäinen Raajärvi in Mäntyharju, Finland has official water-quality measurements, shown as reported. Water clarity: 1.1 m visibility. Phosphorus: 20 µg/L. Chlorophyll-a (algae): 27 µg/L. Maximum depth: 16.4 ft.

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How Ylimmäinen Raajärvi is classified

Ylimmäinen Raajärvi 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.

Ylimmäinen Raajärvi is a lake in Mäntyharju County, Finland with a maximum depth of 16 feet.

Source: the Finnish Environment Institute (Syke) and the ELY Centres — not the EPA Water Quality Portal, last sampled 2024-08-15. Methodology: how these readings are compared.

Swimming conditions

No reading

Limited data

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

Whether Ylimmäinen Raajärvi 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 Ylimmäinen Raajärvi

These are the measurements Syke publishes for Ylimmäinen Raajärvi. More on the source.

Murky, only visible to about 3.6 ft. Phosphorus 20 µg/L. Chlorophyll-a 27 µg/L. TSI 56.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	1.1m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	20µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	27µg/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.	56	Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic

High nutrients, frequent algae, reduced clarity

Ask about Ylimmäinen Raajärvi

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

Lake Details

Max depth

5 m

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Stays near Ylimmäinen Raajärvi

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Fishing Ylimmäinen Raajärvi

→ Ylimmäinen Raajärvi fishing regulations (limits, seasons, special rules)

Frequently asked questions about Ylimmäinen Raajärvi

Where is Ylimmäinen Raajärvi?: Ylimmäinen Raajärvi is a lake in Mäntyharju, Finland. This page reports official water-quality measurements, shown as reported.
What is the water quality of Ylimmäinen Raajärvi?: Ylimmäinen Raajärvi in Mäntyharju, Finland has official water-quality measurements, shown as reported. Water clarity: 1.1 m visibility. Phosphorus: 20 µg/L. Chlorophyll-a (algae): 27 µg/L. Maximum depth: 16.4 ft.
Is Ylimmäinen Raajärvi safe to swim in?: Ylimmäinen Raajärvi 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 Ylimmäinen Raajärvi?: Ylimmäinen Raajärvi has a maximum depth of 16.4 feet.

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Where this data comes from

15 measurements from 1 monitoring station, 2018–2024. 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-vesla15 samples · 2018–2024

Analytical methods

SYKE VESLA

Monitoring station identifiers (1)

64068

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