The ponds are not natural bodies of water, but man-made in the mid-18th century. At that time, a large industrial complex was built east of the then developed Holzminden urban area on the course of the Holzmindebach - an ironworks, consisting of three sub-areas. Following the course of the stream, these were: the blast furnace, the cutting hut and the hammer hut. Each of these areas had a pond. Water from the Holzminde was dammed up in it, which had to serve as the driving force for a wide variety of facilities. For a long time these ponds did not have any special names, but were referred to according to their location or the respective area of the complex, for example as "middle [r] Hüttenteich". It was not until the 20th century, when the last structural remains of those systems had disappeared, that the names "Upper Pond", "Middle Pond" and "Lower Pond" prevailed. Source: holzminden.de/bauen-wirtschaft/planen-bauen/tag-des-offenen-denkmals