Germany: Moehne Reservoir (Möhnesee)

The Moehne Reservoir is an artificial lake in North Rhine-Westphalia, some 45 km east of Dortmund, Germany. The lake is formed by the damming of two rivers, Möhne and Heve, and with its four basins stores as much as 135 million cubic metres of water. The dam was built between 1908 and 1913 to help control floods, regulate water levels on the Ruhr river downstream, and generate hydropower. Today, the lake is also a tourist attraction. During WWII the dam was breached by RAF Lancaster Bombers (“The Dambusters”) during Operation Chastise on the night of 16–17 May 1943, together with the Edersee dam in northern Hesse. Bouncing bombs had been constructed which were able to skip over the protective nets that hung in the water. A huge hole of 77 m by 22 m was blown into the dam.

With matching stamp:

Stamp:
The 100th Anniversary of the Möhnetalsperre Dam - Issued: 04-04-2013