Buchholzer Weiher

The Buchholzer Weiher knows an amazing flora. However, it should not be forgotten that it has a high heavy metal burden as a former sales basin in the lead-mining area.

CAUTION! the edge of the pond is very swampy in places. Especially when the reed grass is still beautiful green, you only notice it when you are already inside.

The "Buchholzer Weiher", which lies in the middle of the mountain damage area and also in the military restricted area in Mechernich, is a heavily loaded settling basin. Nevertheless, this water was declared by the district government of Cologne as the Upper Fisheries Authority to fish and Laichschonbezirk.
The Buchholzer Weiher was artificially created more than 100 years ago, today it is the fauna-flora-habitat area "Kallmuther Berg".
At that time, when the Mechernicher Erzabbaugebiet was one of the largest in Europe, the water was collected in this basin after rinsing the sand-water mixture and settling the sand and recycled. Since the Buchholzer pond, which is a maximum of 1.50 meters deep, has virtually no natural feed, he silted over the years more and more. The water level, however, remained relatively constant in recent years.
Since the closure of the mine 50 years ago, a remarkable fauna and flora has developed in and around the Buchholzer pond. A survey commissioned by the district government of Cologne in 2008 certified four different species of fish, including the two endangered fish species crucian carp, the fish of the year 2010, and the moderlieschen.