The lake was excavated as part of a post-WWI urban design strategy to convert former military fortification terrain into public recreational spaces.
It remains a significant example of Fritz Encke's 'Cologne Green Belt' vision, which aimed to encircle the city with a continuous park system.
The park borders the historic Kalscheurer Weiher, another artificial lake linked by the same landscape master plan.
The water body covers approximately 20 hectares, providing a significant cooling effect for the surrounding Lindenthal district.
Decksteiner Weiher is a sprawling, artificial lake located within the Outer Green Belt of Cologne, originally constructed between 1927 and 1929 as part of a major urban landscape project. The lake serves as a central hub for recreational activities, surrounded by parkland and integrated into the historic fortification ring of the city. Its design was overseen by Fritz Encke, the city's garden director at the time, who intended the area to provide accessible green space for the public. The site features a central island, reached by bridges, and offers expansive lawns for lounging. The surrounding pathways are popular for walking, jogging, and cycling throughout the year. The water is managed for ecological health and provides a habitat for various waterfowl species. The nearby Haus am See serves as a focal point for visitors seeking refreshments within the park grounds.
The small stone bridge crossing to the island provides the most balanced perspective of the water and surrounding trees.
Bring a picnic blanket as the large lawns are ideal for relaxing during warmer months.
Walk the full loop around the water to experience both the open meadows and the denser, forested sections of the Green Belt.
Visit the connected pathways that lead deeper into the Cologne Green Belt for a longer nature excursion.
Do not attempt to swim in the lake, as it is strictly prohibited for safety and environmental reasons.
Keep dogs on a leash in designated areas and maintain quiet near the water to avoid disturbing local wildlife.
