Iso Suojärvi
Iso Suojärvi in Mäntyharju, Finland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 1.5 m visibility. Phosphorus: 12 µg/L. Chlorophyll-a (algae): 5.8 µg/L. Maximum depth: 6.6 ft.
- Clarity
- 1.5 m
- Max depth
- 2 m
Why Iso Suojärvi has no A–F grade
Iso Suojärvi 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, phosphorus and 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 Suojärvi is a lake in Mäntyharju County, Finland with a maximum depth of 7 feet.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2021-08-25. 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 Suojärvi
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Murky, only visible to about 4.9 ft. Phosphorus level: 12 µg/L. Chlorophyll-a: 5.8 µg/L. Trophic State Index: 47.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.5 m | Not graded |
| Phosphorus | 12 µg/L | Not graded |
| Chlorophyll-a (Algae) | 5.8 µg/L | Not graded |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 2 m |
Where to stay near Iso Suojärvi
Compare lakeside cabins, hotels, and vacation rentals near Iso Suojärvi in Mäntyharju, 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 Suojärvi
Frequently asked questions about Iso Suojärvi
What is the water quality of Iso Suojärvi?
- Iso Suojärvi in Mäntyharju, Finland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 1.5 m visibility. Phosphorus: 12 µg/L. Chlorophyll-a (algae): 5.8 µg/L. Maximum depth: 6.6 ft.
Is Iso Suojärvi safe to swim in?
- Iso Suojärvi 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 Suojärvi?
- Iso Suojärvi has a maximum depth of 6.6 feet.
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Where this data comes from
19 measurements from 2 monitoring stations, 2017–2021. Retrieved from Syke VESLA (not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- Finnish Environment Institute (Syke) and ELY Centres
syke-vesla19 samples · 2017–2021
Analytical methods
- SYKE VESLA
Monitoring station identifiers (2)
6839714822
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: 2021-08-25
Monitoring stations: 2