Kölnbrein Dam

The Kölnbrein Dam, completed in 1977, is Austria’s tallest dam at 200 m high and 626 m long. It is a concrete arch structure forming the upper reservoir for the pumped-storage Malta–Reisseck power system. Built between 1971–79, it stores up to 205 million m³ behind its crest, feeding turbines that generate a combined 1,028.5 MW across multiple stages, and producing over 1,200 GWh annually. Engineering challenges included constructing at 1,902 m altitude along a winding Alpine route with rock tunnels and hairpin bends. Structural stabilization advanced through innovative grouting and downstream thrust-block additions after initial cracking during impoundment. The dam is also equipped with the world’s first “Airwalk” – a glass cantilever viewing platform that extends over the crest, giving a direct view into the valley below. It stands as a landmark of Alpine hydropower engineering, combining massive structural design, pumped-storage technology, and public engagement within the Verbund energy network.

Between May and October (season dependent on the alpine road), visitors can access the dam and the Airwalk daily from 09:00 to 16:00. Guided tours inside the dam are offered June–September, with regular intervals from 09:00 to 16:00; in May and October, tours are available on request. Admission for individuals is €11, with reduced rates (€9 adults, €7 ages 6–15); children under 5 are free. Group tours (15+) receive further discounts and include optional meal packages from nearby mountain hotel restaurants. Visitors begin in the Energy World Malta exhibition and can walk the glass‑bottom Airwalk before joining a guided tunnel tour that descends into the dam’s interior – temperatures remain around 8 °C year-round, so warm clothing and sturdy footwear are essential. Seasonal road access may close during winter; check Verbund’s site or local weather updates before planning. Nearby hiking trails and hotel services make the dam a full-day Alpine excursion.