Where is Vähä-Rihu Lake?

Vähä-Rihu Lake is a lake in Heinola, Finland. This page reports official water-quality measurements, shown as reported.

Is Vähä-Rihu Lake safe to swim in?

Vähä-Rihu 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.

Vähä-Rihu Lake

Heinola, FinlandView map Directions

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

Clarity

3.7 m

Clearer than most

Secchi · sampled 2022

Phosphorus

5 µg/L

Less phosphorus than most

Measured by Syke

Chlorophyll-a

2.4 µg/L

Less algae than most

Measured by Syke

Limited data

See the measurements Directions Where to stay

Vähä-Rihu Lake in Heinola, Finland has official water-quality measurements, shown as reported. Water clarity: 3.7 m visibility. Phosphorus: 5 µg/L. Chlorophyll-a (algae): 2.4 µg/L.

Loading map…

How Vähä-Rihu Lake is classified

Vähä-Rihu 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.

Vähä-Rihu Lake is a lake in Heinola County, Finland.

Source: the Finnish Environment Institute (Syke) and the ELY Centres — not the EPA Water Quality Portal, last sampled 2022-08-02. Methodology: how these readings are compared.

What Vähä-Rihu Lake is good for

From access and monitoring records, not editorial picks.

Clear water12.1 ft of visibility

Swimming conditions

No reading

Limited data

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

Whether Vähä-Rihu 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.

Get alerts for Vähä-Rihu Lake →

Water quality measurements for Vähä-Rihu Lake

These are the measurements Syke publishes for Vähä-Rihu Lake. More on the source.

Good clarity, visible to about 12.1 ft. Phosphorus 5 µg/L. Chlorophyll-a 2.4 µg/L. TSI 36.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	3.7m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	5µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	2.4µg/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.	36	Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic

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

Ask about Vähä-Rihu Lake

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

Stays via Stay22

Stays near Vähä-Rihu Lake

Compare lakeside cabins, hotels, and vacation rentals near Vähä-Rihu Lake in Heinola, Finland — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.

Top-rated places to stay near Vähä-Rihu Lake

Prices for Oct 2–4, 4 adults. Change dates on the map below.

Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.

Follow Vähä-Rihu Lake’s readings

Email me when new measurements post for this lake. Updates stay free.

Or email

Fishing Vähä-Rihu Lake

→ Vähä-Rihu Lake fishing regulations (limits, seasons, special rules)

Frequently asked questions about Vähä-Rihu Lake

Where is Vähä-Rihu Lake?: Vähä-Rihu Lake is a lake in Heinola, Finland. This page reports official water-quality measurements, shown as reported.
What is the water quality of Vähä-Rihu Lake?: Vähä-Rihu Lake in Heinola, Finland has official water-quality measurements, shown as reported. Water clarity: 3.7 m visibility. Phosphorus: 5 µg/L. Chlorophyll-a (algae): 2.4 µg/L.
Is Vähä-Rihu Lake safe to swim in?: Vähä-Rihu 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.

Explore Vähä-Rihu Lake across LakeQuality

Lake Fishing Forecast

Species activity outlook by water temperature and season

More lakes in Finland

Lakes in Finland

Official water quality for lakes in Finland

Lake water quality by country

EU bathing ratings and named-lake measurements

Where this data comes from

3 measurements from 1 monitoring station, 2022. 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-vesla3 samples · 2022

Analytical methods

SYKE VESLA

Monitoring station identifiers (1)

15516

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