Talsperre Malter, Reservoir and cultural monument in Dippoldiswalde, Germany

Talsperre Malter is a reservoir near Malter in Saxony that dams the middle course of the Rote Weißeritz. Its dam is a curved gravity wall of quarry stone masonry built on the Intze principle, curved to a radius of 250 metres, 50 metres long at the foundation and 193 metres along the crown. The water side carries a 70-centimetre concrete layer over biotite gneiss quarried near Malter station; the outer face is quarry stone from a design by the Dresden architects Lossow and Kühne. The road from Malter to Seifersdorf runs across the crown.

The dam was built between 1909 and 1913 after the July 1897 flood on the Rote Weißeritz destroyed 320 houses and killed 19 people. The Weißeritztalsperrengenossenschaft, founded in 1909 with 281 members and chaired by mill owner Theodor Bienert, financed the project through bonds of 14.3 million marks. The reservoir submerged the village of Niedermalter with 45 buildings, three mills and a section of the Weißeritztalbahn, which was rerouted on a new 7-kilometre alignment opened on 15 April 1912.

The reservoir's construction displaced the village of Niedermalter, whose 45 buildings, three mills (Rote Mühle, Tennertmühle, Malter-Mühle) and part of the narrow-gauge Weißeritztalbahn lay in the flooded area. Most residents resettled in neighbouring villages. The railway was rerouted over about 7 km and reopened on 15 April 1912, and the road from Malter to Seifersdorf now runs across the dam crown.

The dam crest carries the road linking Malter and Seifersdorf, so the structure can be crossed on foot or by car. Two bathing spots and a campsite lie by the water, and several hiking trails circle the lake. On the eastern shore stands the König-Johan-Turm, a lookout tower built in 1885; the narrow-gauge Weißeritztalbahn stops in Malter and Seifersdorf.

From 1968 to 1983, an underwater station called Malter I operated at the reservoir, conducting research in underwater biology. This unusual project was an early example of scientific work in extreme environments.