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Gradiško jezero is an artificial dam lake located near the settlement of Gradišče pri Lukovici in Slovenia. It was created in 2002 as a wet retention basin on the Drtijščica stream. The main purpose of its construction was to reduce the risk of flooding in the middle and lower reaches of the Radomlje River and to protect the Ljubljana–Maribor highway from torrent waters. The lake spans across two municipalities: Lukovica and Moravče, and it represents an important part of the natural landscape of both municipalities.
The construction of Gradiško jezero was carried out by Direkcija Republike Slovenije za vode (The Directorate of the Republic of Slovenia for Water), which is responsible for managing water resources in Slovenia. The project was financed by the state budget as part of a broader plan to control flooding and protect infrastructure such as the Ljubljana–Maribor motorway.
Although no natural lake existed in this area before the creation of the artificial lake, legends about a lake circulated in local folklore. One such legend tells the story of a dragon that demanded the daughter of a nobleman as a sacrifice but was defeated by a beggar who was richly rewarded. Another tale speaks of noblemen who traveled across the lake by boats, visiting one another and fishing. According to these narratives, serfs later broke through the dam, causing the water to drain away and the area to transform into pastures. Legends about dragons have existed since the early periods of human history, captivating the imagination of people for approximately six thousand years. In Slovenian tradition, dragons are often associated with swamps, lakes, rivers, and mountain abysses, as reflected in the folklore surrounding Gradiško jezero.
In recent years, Gradiško jezero has become a matter of concern due to the presence of harmful algae and bacteria. Recent water analyses have detected cyanobacteria of the genus Oscillatoria, known to produce cyanotoxins—poisonous substances that can harm humans and animals. Although it has not yet been confirmed whether toxins are present, experts advise caution. Fish in the lake could potentially be exposed to these toxins, which may affect their safety for consumption. Until results from molecular analyses are available, people are advised to exercise caution when consuming fish from the lake, as toxins could pose a health risk.
Today, Gradiško jezero is not only a technical project for flood management but also a popular destination for recreation and relaxation. A 4.2-kilometer gravel path runs around the lake, making it ideal for walking, running, and cycling. Additionally, the lake is a favorite spot for anglers due to its diverse fish species, including carp, pike, and perch. |
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