The Holzminde is a small river that flows through the center of the town of Holzminden in southern Lower Saxony, Germany. The town’s proximity to the “red water”, as the Holzminde is popularly referred to, has shaped its development over the centuries – and in 1904, one section of the river was diverted into a tunnel structure. This made it possible to create enough space for new traffic routes in the town center. The result was the construction of what is now the state highway L550. More than a century later, the historic tunnel is once again the focus of an important infrastructure project: over the years, time had left its mark.
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