Countless songs and stories have been written about Germany's oldest river, steeped as it is in legend. The inhabitants of Cologne may not have found the Nibelungen gold, which was said to shimmer at the bottom of the Rhine, but the river has still provided the city with economic influence. Cologne has been a river-port ever since the Romans founded their city of Colonia on the bank of the Rhine. Nowadays, more than ten million tons of goods are turned over in the docks each year. From time to time in the past, industrial production has threatened the wildlife and plants of the river, but initiatives to save the Rhine are having an effect. Fish have now returned to its waters, and are sometimes to be found as close as the Altstadt. The level of the Rhine, as measured by the Cologne water-level indicator, has often enough forced the inhabitants of the Altstadt to retreat, taking their belongings with them. In the worst floods of the century in 1995, the water level reached 10.69 metres and the whole of the Altstadt was under water.