Koljonselkä
Orivesi, FinlandView mapDirections
Syke publishes the water-quality measurements for Koljonselkä. Here is what has been measured.
- 154 ft max depth
- Limited data
Koljonselkä in Orivesi, Finland has official water-quality measurements, shown as reported. Water clarity: 2 m visibility. Phosphorus: 12.5 µg/L. Chlorophyll-a (algae): 7.2 µg/L. Maximum depth: 153.9 ft.
How Koljonselkä is classified
Koljonselkä 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.
Koljonselkä is a lake in Orivesi County, Finland with a maximum depth of 154 feet.
Source: the Finnish Environment Institute (Syke) and the ELY Centres — not the EPA Water Quality Portal, last sampled 2026-02-19. Methodology: how these readings are compared.
What Koljonselkä is good for
From access and monitoring records, not editorial picks.
- Deep water153.9 ft surveyed max depth
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Koljonselkä 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.
Water quality measurements for Koljonselkä
These are the measurements Syke publishes for Koljonselkä. More on the source.
Murky, only visible to about 6.6 ft. Phosphorus 12.5 µg/L. Chlorophyll-a 7.2 µg/L. TSI 47.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 2m | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 12.5µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 7.2µg/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. | 47 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Koljonselkä
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
46.9 m
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Frequently asked questions about Koljonselkä
Where is Koljonselkä?
- Koljonselkä is a lake in Orivesi, Finland. This page reports official water-quality measurements, shown as reported.
What is the water quality of Koljonselkä?
- Koljonselkä in Orivesi, Finland has official water-quality measurements, shown as reported. Water clarity: 2 m visibility. Phosphorus: 12.5 µg/L. Chlorophyll-a (algae): 7.2 µg/L. Maximum depth: 153.9 ft.
Is Koljonselkä safe to swim in?
- Koljonselkä 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 Koljonselkä?
- Koljonselkä has a maximum depth of 153.9 feet.
Explore Koljonselkä across LakeQuality
More lakes in Finland
Where this data comes from
174 measurements from 3 monitoring stations, 2016–2026. Retrieved from Syke VESLA (not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- Finnish Environment Institute (Syke) and ELY Centres
syke-vesla174 samples · 2016–2026
Analytical methods
- SYKE VESLA
Monitoring station identifiers (3)
930593239327
Authority classifications are shown as the authority published them. See where the data comes from and data sources.