The motif
The Oderteich near Torfhaus was once a place for painters, also because important High Harz routes crossed here. It is the oldest dam in Germany and, when completed in 1721, it was also Germany’s largest. The Oderteich held this record well into the industrial age, until 1891. It can store the then almost unimaginable amount of 1.75 million cubic metres of water, one cubic metre being 1,000 litres. The costs were four times higher than planned, but the mining authority was satisfied and approved everything, as the benefit was beyond question. The high Oder Dam was sealed – another innovation – not with earth, but with compacted granite gravel.
Its purpose was not flood protection, but to provide a water supply for the New Rehberg Ditch, which delivered process water to the high-lying mines of St Andreasberg. Throughout the year, day and night without interruption, for example in the Samson Mine. The outflow at the Oderteich is still regulated today by the straining house on the dam.
For centuries, water provided the only source of energy for mining. Water struck the water wheels, drove the reversing wheels and the man engines, lifting the ore from the shaft and bringing all the miners to their workplaces underground and back to the surface. Even today, the water from the Rehberg Ditch drives two turbines deep down in the Samson Mine.