Iso-Hyyhynen Lake
Iso-Hyyhynen Lake in Vesilahti, Finland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 1.1 m visibility. Phosphorus: 15 µg/L. Maximum depth: 23 ft.
- Clarity
- 1.1 m
- Max depth
- 7 m
Why Iso-Hyyhynen Lake has no A–F grade
Iso-Hyyhynen Lake in Finland is published with the authority's own measurements, not a LakeQuality letter. official authority class; not a LakeQuality A–F letter Sampling here has recorded water clarity and phosphorus, but not algae (chlorophyll-a).
A letter on the LakeQuality scale would be an invention, not an official class. Everything below that has been measured is still reported on this page.
Monitoring: the Finnish Environment Institute (Syke) and the ELY Centres.
Iso-Hyyhynen Lake is a lake in Vesilahti County, Finland with a maximum depth of 23 feet.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2020-02-26. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Iso-Hyyhynen Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Murky, only visible to about 3.6 ft. Phosphorus level: 15 µg/L. Trophic State Index: 51.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.1 m | Not graded |
| Phosphorus | 15 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 51 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 7 m |
Where to stay near Iso-Hyyhynen Lake
Compare lakeside cabins, hotels, and vacation rentals near Iso-Hyyhynen Lake in Vesilahti, 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.
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Fishing Iso-Hyyhynen Lake
Frequently asked questions about Iso-Hyyhynen Lake
What is the water quality of Iso-Hyyhynen Lake?
- Iso-Hyyhynen Lake in Vesilahti, Finland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 1.1 m visibility. Phosphorus: 15 µg/L. Maximum depth: 23 ft.
Is Iso-Hyyhynen Lake safe to swim in?
- Iso-Hyyhynen 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-Hyyhynen Lake?
- Iso-Hyyhynen Lake has a maximum depth of 23 feet.
Explore Iso-Hyyhynen Lake across LakeGrade
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Where this data comes from
2 measurements from 1 monitoring station, 2020. 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-vesla2 samples · 2020
Analytical methods
- SYKE VESLA
Monitoring station identifiers (1)
7543
Authority classifications are stored separately from LakeQuality A–F letters and are never blended. See methodology and data sources.
Data Sources
Water quality data from the EPA Water Quality Portal
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2020-02-26
Monitoring stations: 1