The mass balance at the glacier Übergossene Alm has been measured with the direct/glaciological method during the Hydrological Decade IHD 1965-1975. The Übergossene Alm glacier (also: Hochköniggletscher) is a flat plateau glacier located between 2860 and 2480 m a.s.l. in the Northern Limestone Alps which showed signifcant retreat in the last decades. At Übergossene Alm, the intensive monitoring during the IHD included meteorological and hydrological measurements as well as ice thickness measurements. Until 1996, snow heights and surface elevation changes have been measured, which have been used to estimate mass balance. The surveys have been stopped as the glacier disintegrated in several smaller parts. Measuring mass balance at Übergossene Alm has been sophisticated, as the total area of this flat glacier was accumulation area in some years and ablation area in others. In addition to that, the glacier surface is exposed to wind drift, so that finding stable ablation or accumulation patterns for placing ablation stakes or snow pits have been difficult.