Where is Iso-Roine Lake?

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

Is Iso-Roine Lake safe to swim in?

Iso-Roine 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-Roine Lake?

Iso-Roine Lake has a maximum depth of 221.5 feet.

Iso-Roine Lake

Hämeenlinna, FinlandView map Directions

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

Clarity

2.9 m

Clearer than most

Secchi · sampled 2024

Phosphorus

10 µg/L

Typical for Finland

Measured by Syke

Chlorophyll-a

5.7 µg/L

Typical for Finland

Measured by Syke

Max depth

67.5 m

Bathymetric survey

222 ft max depth
Limited data

See the measurements Directions Where to stay

Iso-Roine Lake in Hämeenlinna, Finland has official water-quality measurements, shown as reported. Water clarity: 2.9 m visibility. Phosphorus: 10 µg/L. Chlorophyll-a (algae): 5.7 µg/L. Maximum depth: 221.5 ft.

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How Iso-Roine Lake is classified

Iso-Roine 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-Roine Lake is a lake in Hämeenlinna County, Finland with a maximum depth of 222 feet.

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

What Iso-Roine Lake is good for

From access and monitoring records, not editorial picks.

Deep water221.5 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-Roine 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-Roine Lake

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

Moderate clarity, visible to about 9.4 ft. Phosphorus 10 µg/L. Chlorophyll-a 5.7 µg/L. TSI 43.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	2.85m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	10µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	5.7µg/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.	43	Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic

Moderate nutrients, good water quality

Ask about Iso-Roine Lake

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

Lake Details

Max depth

67.5 m

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Fishing Iso-Roine Lake

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

Frequently asked questions about Iso-Roine Lake

Where is Iso-Roine Lake?: Iso-Roine Lake is a lake in Hämeenlinna, Finland. This page reports official water-quality measurements, shown as reported.
What is the water quality of Iso-Roine Lake?: Iso-Roine Lake in Hämeenlinna, Finland has official water-quality measurements, shown as reported. Water clarity: 2.9 m visibility. Phosphorus: 10 µg/L. Chlorophyll-a (algae): 5.7 µg/L. Maximum depth: 221.5 ft.
Is Iso-Roine Lake safe to swim in?: Iso-Roine 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-Roine Lake?: Iso-Roine Lake has a maximum depth of 221.5 feet.

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Where this data comes from

29 measurements from 5 monitoring stations, 2017–2024. 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-vesla29 samples · 2017–2024

Analytical methods

SYKE VESLA

Monitoring station identifiers (5)

61809
42233
1851
66480
96727

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