Stausee Wasserfallboden, reservoir in the Hohe Tauern, Kaprun, Austria

Stausee Wasserfallboden is a reservoir in the Hohe Tauern, Salzburg, at 1,672 m above sea level (1,680 m from mid-2025). Its valley end is closed by the Limberg arch dam, 120 m high and 357 m long, built 1938–1951 and raised to 129 m high and 365 m long by 2025. The lake covers 1.5 km² and stores 81.2 million m³, increased to 93.9 million m³ after the raising.

The Limberg dam, a 120 m high and 357 m long arch dam, was built between 1938 and 1951. Raising its crest to 129 m and lengthening it to 365 m by 2025, during construction of Limberg III, increased the reservoir's storage capacity from 81.2 to 93.9 million m³. The impoundment submerged the Limbergalpe and the Erzherzog-Rainer-Hütte, built in 1868 by the ÖAV as the first shelter of its kind in the Eastern Alps.

The name Wasserfallboden refers to the valley floor beneath the waterfall of the Limbergbach. When the valley was dammed, the Limbergalpe and the Erzherzog-Rainer-Hütte, built in 1868 by the ÖAV as the first shelter hut in the Eastern Alps, disappeared beneath the water. The reservoir now serves as the lower basin for the Limberg I, II and III power stages.

Access is available from June to October via shuttle buses and the Lärchwand inclined lift, Europe's largest open lift of its kind. Visitors can take guided dam tours, enjoy hiking trails, or attempt via ferrata routes, with parking and transport connections from Kaprun.

This site was once a inhabited valley with a mountain hut built in 1868 that was flooded when the dam was constructed. The submersion of this former refuge reveals how the creation of the reservoir transformed the human story of the mountain.