Where is Iso-Tölppä Lake?

Iso-Tölppä Lake is a lake in Joensuu, Finland. This page reports official water-quality measurements, shown as reported.

Is Iso-Tölppä Lake safe to swim in?

Iso-Tölppä Lake 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 Iso-Tölppä Lake?

Iso-Tölppä Lake has a maximum depth of 55.8 feet.

Iso-Tölppä Lake

Joensuu, FinlandView map Directions

Syke publishes the water-quality measurements for Iso-Tölppä Lake. Here is what has been measured.

Clarity

4 m

Clearer than most

Secchi · sampled 2021

Phosphorus

9 µg/L

Less phosphorus than most

Measured by Syke

Chlorophyll-a

3.4 µg/L

Less algae than most

Measured by Syke

Max depth

17 m

Bathymetric survey

56 ft max depth
Limited data

See the measurements Directions Where to stay

Iso-Tölppä Lake in Joensuu, Finland has official water-quality measurements, shown as reported. Water clarity: 4 m visibility. Phosphorus: 9 µg/L. Chlorophyll-a (algae): 3.4 µg/L. Maximum depth: 55.8 ft.

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How Iso-Tölppä Lake is classified

Iso-Tölppä Lake 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.

Iso-Tölppä Lake is a lake in Joensuu County, Finland with a maximum depth of 56 feet.

Source: the Finnish Environment Institute (Syke) and the ELY Centres — not the EPA Water Quality Portal, last sampled 2021-09-06. Methodology: how these readings are compared.

What Iso-Tölppä Lake is good for

From access and monitoring records, not editorial picks.

Clear water13.1 ft of visibility
Deep water55.8 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 Iso-Tölppä Lake 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 Iso-Tölppä Lake

These are the measurements Syke publishes for Iso-Tölppä Lake. More on the source.

Good clarity, visible to about 13.1 ft. Phosphorus 9 µg/L. Chlorophyll-a 3.4 µg/L. TSI 39.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	4m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	9µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	3.4µg/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.	39	Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic

Low nutrients, clear water. No reading is a swimming clearance.

Ask about Iso-Tölppä Lake

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

Lake Details

Max depth

17 m

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Stays near Iso-Tölppä Lake

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Fishing Iso-Tölppä Lake

→ Iso-Tölppä Lake fishing regulations (limits, seasons, special rules)

Frequently asked questions about Iso-Tölppä Lake

Where is Iso-Tölppä Lake?: Iso-Tölppä Lake is a lake in Joensuu, Finland. This page reports official water-quality measurements, shown as reported.
What is the water quality of Iso-Tölppä Lake?: Iso-Tölppä Lake in Joensuu, Finland has official water-quality measurements, shown as reported. Water clarity: 4 m visibility. Phosphorus: 9 µg/L. Chlorophyll-a (algae): 3.4 µg/L. Maximum depth: 55.8 ft.
Is Iso-Tölppä Lake safe to swim in?: Iso-Tölppä Lake 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 Iso-Tölppä Lake?: Iso-Tölppä Lake has a maximum depth of 55.8 feet.

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Where this data comes from

9 measurements from 1 monitoring station, 2018–2021. 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-vesla9 samples · 2018–2021

Analytical methods

SYKE VESLA

Monitoring station identifiers (1)

22782

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