Großer Ostersee
Großer Ostersee in Weilheim-Schongau, Bavaria has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 3.4 m visibility. Phosphorus: 7 µg/L. Chlorophyll-a (algae): 2 µg/L.
- Clarity
- 3.4 m
Why Großer Ostersee has no A–F grade
Großer Ostersee in Bavaria 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 Bavarian Environment Agency (LfU) Gewässerkundlicher Dienst.
Großer Ostersee is a lake in Weilheim-Schongau County, Bavaria.
Source: the Bavarian Environment Agency (LfU) Gewässerkundlicher Dienst — not the EPA Water Quality Portal, last sampled 2023-10-23. 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 Großer Ostersee
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Good clarity, visible to about 11 ft. Phosphorus level: 7 µg/L. Chlorophyll-a: 2 µg/L. Trophic State Index: 37.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.35 m | Not graded |
| Phosphorus | 7 µg/L | Not graded |
| Chlorophyll-a (Algae) | 2 µg/L | Not graded |
| Trophic State Index (TSI) | 37 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Großer Ostersee
Compare lakeside cabins, hotels, and vacation rentals near Großer Ostersee in Weilheim-Schongau, Bavaria — 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 Großer Ostersee
Frequently asked questions about Großer Ostersee
What is the water quality of Großer Ostersee?
- Großer Ostersee in Weilheim-Schongau, Bavaria has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 3.4 m visibility. Phosphorus: 7 µg/L. Chlorophyll-a (algae): 2 µg/L.
Is Großer Ostersee safe to swim in?
- Großer Ostersee 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.
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Where this data comes from
107 measurements from 1 monitoring station, 2017–2023. Retrieved from the listed programme (not the EPA Water Quality Portal). See data sources on 2026-08-20.
Collected and reported by
- Bayerisches Landesamt für Umwelt (LfU) — Gewässerkundlicher Dienst
gkd-by107 samples · —
Analytical methods
- LfU Bayern GKD lake chemistry
Monitoring station identifiers (1)
2046
Authority classifications are stored separately from LakeQuality A–F letters and are never blended. See how grades are calculated and data sources.