Qualla: Möhne Reservoir

Möhne Reservoir: Introduction

Sun, 17 May 2026 00:00:00 GMT

Photo credit Dominik Schäfer, CC BY-SA 3.0 de. Just after midnight on 17 May 1943, a 22-meter section of the Möhne Dam disappeared. A bouncing bomb dropped by an Avro Lancaster of No. 617 Squadron had skipped across the reservoir, sunk against the masonry wall, and detonated. The breach was 77 meters wide. The water that had spent thirty years filling Europe's largest reservoir behind that wall went down the Möhne valley at killing speed. By morning at least 1,579 people were dead. More than a thousand of them had been brought to the Ruhr against their will. About 526 of them were Soviet women held in a forced labor camp at Neheim, and they made up the single largest group of victims of the most famous bombing raid of the war.

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Image: Dominik Schäfer | CC BY-SA 3.0 de

Möhne Reservoir: The Dam Before the Story

Sun, 17 May 2026 00:00:00 GMT

Photo credit Ad Meskens, CC BY-SA 4.0. By 1904 the growing Ruhr industrial belt was using more water than the existing reservoirs of the Ruhr river system could supply. The Ruhrtalsperreverein, the association of dam-builders, decided that storage volume needed to triple. Between 1908 and 1912 they built the Möhnetals...

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Image: Ad Meskens | CC BY-SA 4.0

Möhne Reservoir: Operation Chastise

Sun, 17 May 2026 00:00:00 GMT

Photo credit CC BY-SA 3.0. The British engineer Barnes Wallis had spent years arguing that the German war economy could be crippled by destroying the dams that supplied it with water. The technical problem was that the dams were protected by torpedo nets and could not be hit at depth by ordinary bombs. Wal...

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Image: CC BY-SA 3.0

Möhne Reservoir: The Flood

Sun, 17 May 2026 00:00:00 GMT

Photo credit CEphoto, Uwe Aranas, CC BY-SA 4.0. What followed has to be told from the ground. The wave that came down the Möhne valley reached the small town of Neheim, downstream from the dam, in the early hours of the morning. On the eastern edge of Neheim was a camp holding Soviet women who had been deported to the Ruhr to ...

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Image: CEphoto, Uwe Aranas | CC BY-SA 4.0

Möhne Reservoir: Rebuilt by Forced Hands

Sun, 17 May 2026 00:00:00 GMT

Photo credit D-click, CC BY 3.0. The dam itself was not allowed to stay broken for long. Albert Speer, who toured the site, described the powerhouse below the wall as if it had been erased along with its turbines. Industry in the Ruhr stopped while electrical installations dried out. Within days, the Organisatio...

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Image: D-click | CC BY 3.0

Möhne Reservoir: The Lake That Remains

Sun, 17 May 2026 00:00:00 GMT

Photo credit Frank Vincentz, CC BY-SA 3.0. Today the Möhnesee is a tourist lake. People sail it, fish it, walk its shoreline. It is a Natura 2000 European bird sanctuary, home to one of the largest great crested grebe breeding populations in Westphalia and a stopover for four to six thousand waterfowl on migration. The 19...

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Image: Frank Vincentz | CC BY-SA 3.0