Grosser Kronsee Rutenberg

Germany Lake 1 - Excellent

Großer Kronsee is a natural lake located approximately 3 km north of Lychen in the Neustrelitz Small Lake District of northern Brandenburg. The lake covers 42 hectares with a maximum depth of 26 metres and stretches approximately 1.8 km in an east-west direction. It is groundwater-fed with no surface inflows or outflows. The bathing site at Rutenberg offers excellent water quality with summer visibility depths averaging between 2 and 5.7 metres, making it one of Brandenburg's clearest lakes.

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Water

Natural lake with a surface area of 42 hectares. Maximum depth 26 metres. Groundwater-fed with no surface inflows or outflows. Summer water temperatures range from 9°C to 24°C with a mean of 20°C. Water transparency averages 3.3 metres with maximum recorded depths of 5.7 metres. pH values range from 7.27 to 8.15 with a mean of 7.47. Freshwater with salinity less than 0.5‰.

Location

Rutenberg, approximately 3 km north of Lychen, in the Uckermark district of Brandenburg. The bathing spot is located at the northwestern shore where the village of Rutenberg extends to the water's edge.

Season

Monitoring conducted on a four-weekly basis by the district health authority according to Brandenburg bathing water regulations.

Water Quality

Classified as 'Excellent' for all monitoring periods from 2016–2019 through 2021–2024. Escherichia coli levels (2021–2024): 95-percentile 85/100ml, 90-percentile 62/100ml. Intestinal enterococci (2021–2024): 95-percentile 62/100ml, 90-percentile 48/100ml. No exceedances of microbiological parameters recorded. No cyanobacterial blooms observed. Water classified as nutrient-poor.

Risks

Macroalgae and aquatic plants present. Medium bird activity on the lake. High fish population. No risk of bathing dermatitis from cercariae. No expected short-term microbiological contamination. No expected other pollution.