Ilgys Lake
Ilgys Lake in Utenos, Lithuania has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 4.4 m visibility. Phosphorus: 10 µg/L. Chlorophyll-a (algae): 3.4 µg/L.
- Clarity
- 4.4 m
Why Ilgys Lake has no A–F grade
Ilgys Lake in Lithuania 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 Environmental Protection Agency of Lithuania (Aplinkos apsaugos agentūra).
Ilgys Lake is a lake in Utenos County, Lithuania.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2022-10-10. Grade methodology: LakeGrade methodology.
Watch Ilgys Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Ilgys Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Good clarity, visible to about 14.3 ft. Phosphorus level: 10 µg/L. Chlorophyll-a: 3.4 µg/L. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.35 m | Not graded |
| Phosphorus | 10 µg/L | Not graded |
| Chlorophyll-a (Algae) | 3.4 µg/L | Not graded |
| Trophic State Index (TSI) | 40 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Ilgys Lake
Compare lakeside cabins, hotels, and vacation rentals near Ilgys Lake in Utenos, Lithuania — 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 Ilgys Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Fishing Ilgys Lake
Frequently asked questions about Ilgys Lake
What is the water quality of Ilgys Lake?
- Ilgys Lake in Utenos, Lithuania has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 4.4 m visibility. Phosphorus: 10 µg/L. Chlorophyll-a (algae): 3.4 µg/L.
Is Ilgys Lake safe to swim in?
- Ilgys 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 Ilgys Lake across LakeGrade
More lakes in Lithuania
Where this data comes from
22 measurements from 2 monitoring stations, 2021–2022. Retrieved from Lithuanian lake state monitoring (AAA; not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- Environmental Protection Agency of Lithuania (Aplinkos apsaugos agentūra)
aaa-lt22 samples · 2021–2022
Analytical methods
- AAA lake state monitoring
Monitoring station identifiers (2)
LTL316LTL305
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: 2022-10-10
Monitoring stations: 2