Iso-Korppinen Lake
Iso-Korppinen Lake in Viitasaari, Finland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 1 m visibility. Phosphorus: 19.5 µg/L. Maximum depth: 42.7 ft.
- Clarity
- 1 m
- Max depth
- 13 m
Why Iso-Korppinen Lake has no A–F grade
Iso-Korppinen 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-Korppinen Lake is a lake in Viitasaari County, Finland with a maximum depth of 43 feet.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2025-10-09. 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-Korppinen Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Very murky, less than 3.3 ft of visibility. Phosphorus level: 19.5 µg/L. Trophic State Index: 53.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1 m | Not graded |
| Phosphorus | 19.5 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 13 m |
Where to stay near Iso-Korppinen Lake
Compare lakeside cabins, hotels, and vacation rentals near Iso-Korppinen Lake in Viitasaari, 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-Korppinen Lake
Frequently asked questions about Iso-Korppinen Lake
What is the water quality of Iso-Korppinen Lake?
- Iso-Korppinen Lake in Viitasaari, Finland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 1 m visibility. Phosphorus: 19.5 µg/L. Maximum depth: 42.7 ft.
Is Iso-Korppinen Lake safe to swim in?
- Iso-Korppinen 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-Korppinen Lake?
- Iso-Korppinen Lake has a maximum depth of 42.7 feet.
Explore Iso-Korppinen Lake across LakeGrade
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Where this data comes from
12 measurements from 1 monitoring station, 2024–2025. 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-vesla12 samples · 2024–2025
Analytical methods
- SYKE VESLA
Monitoring station identifiers (1)
25481
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: 2025-10-09
Monitoring stations: 1