Klammsee, reservoir in Kaprun, Austria

Klammsee is a small mountain reservoir near Kaprun located at the end of a narrow gorge. The water is clear and often turquoise, fed by glacier streams, and surrounded by forests and mountains.

The Klammsee was created as a daily storage reservoir for the Kaprun power plant group and began operating in 1947. Its 19-metre-high Bürgsperre dam impounds the Kapruner Ache, collecting water from the Kaprun valley that is not captured by the main stage of the power plant. The reservoir is necessary for the black-start capability of the Kaprun power plant group.

The name Klammsee comes from its position just below the Bürgsperre dam, above the Sigmund-Thun-Klamm gorge. Since 1947 the lake has been part of the Kaprun power plant group, holding 200,000 m³ of water from the Kapruner Ache and the side valleys that the main stage does not capture.

The level walking route around the lake is about 1.3 kilometers long and suitable for families with children, though the final section is not stroller-friendly. Benches and picnic areas invite you to linger, and a visit takes about 20 to 30 minutes.

Klammsee is a daily storage reservoir of the Kaprun power plant group, holding 200,000 m³. Its 19-meter-high Bürgsperre dam impounds the Kapruner Ache and collects water from the Kaprun valley not captured by the main stage. The reservoir is essential for the plant's black-start capability, allowing it to restart without external power.