Iso-Musta Lake
Iso-Musta Lake in Iisalmi, Finland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 0.9 m visibility. Phosphorus: 24.5 µg/L. Chlorophyll-a (algae): 39 µg/L. Maximum depth: 37.7 ft.
- Clarity
- 0.9 m
- Max depth
- 11.5 m
Why Iso-Musta Lake has no A–F grade
Iso-Musta 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, 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-Musta Lake is a lake in Iisalmi County, Finland with a maximum depth of 38 feet.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2022-08-17. 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-Musta Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Very murky, less than 2.8 ft of visibility. Phosphorus level: 24.5 µg/L. Chlorophyll-a: 39 µg/L. Trophic State Index: 60.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.85 m | Not graded |
| Phosphorus | 24.5 µg/L | Not graded |
| Chlorophyll-a (Algae) | 39 µg/L | Not graded |
| Trophic State Index (TSI) | 60 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 11.5 m |
Where to stay near Iso-Musta Lake
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Fishing Iso-Musta Lake
Frequently asked questions about Iso-Musta Lake
What is the water quality of Iso-Musta Lake?
- Iso-Musta Lake in Iisalmi, Finland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 0.9 m visibility. Phosphorus: 24.5 µg/L. Chlorophyll-a (algae): 39 µg/L. Maximum depth: 37.7 ft.
Is Iso-Musta Lake safe to swim in?
- Iso-Musta 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-Musta Lake?
- Iso-Musta Lake has a maximum depth of 37.7 feet.
Explore Iso-Musta Lake across LakeGrade
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Where this data comes from
11 measurements from 1 monitoring station, 2020–2022. Retrieved from Syke VESLA (not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- Finnish Environment Institute (Syke) and ELY Centres
syke-vesla11 samples · 2020–2022
Analytical methods
- SYKE VESLA
Monitoring station identifiers (1)
18247
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: 2022-08-17
Monitoring stations: 1