Journal · No. 001

The bridge that missed by 54 centimetres

Christoph Svoboda · November 10, 2026 · 3 min

In 2003 a surveyor on the German bank of the Rhine at Laufenburg ran a routine height check and found that the bridge coming toward him from the Swiss side would arrive 54 centimetres too low. Nobody had miscalculated.

Germany takes its zero from the North Sea. Switzerland takes its zero from the Mediterranean. The two references sit 27 centimetres apart, everyone involved knew this, and a correction was written into the plans.

It was written in the wrong direction. Instead of closing a gap of 27 centimetres it opened one of 54. That instruction had been sitting in the approved documents for twelve years. It passed every review, because every review confirmed that the correction was present, and it was.

Every review confirmed that the correction was present. It was. It pointed the wrong way.

It surfaced when two physical objects finally had to meet.

The canton's press release is remarkably calm about the whole thing. The adjustment was made on the German approach road. It cost nothing extra and the completion date held. That last part is easy to misread. The error was cheap for one reason, and the reason was that it was still concrete.

Most organisations run on numbers that were converted correctly from a reference nobody says out loud any more. The conversion is usually in there. What nobody re-reads is which way it points, and that stays invisible until two parts of the business have to line up. By then they are not made of concrete, and there is no routine height check.

In the glossary: Shared ReferenceIntended Operating ReferenceObserved Operating Reference