Editing Saastal (section)

==Infrastructure==

In the early 1960s, the [[Mattmarksee]] reservoir was constructed high in the valley to serve [[hydroelectric]] schemes and regulate seasonal [[Runoff (hydrology)|runoff]]. The dam, completed in 1965, impounds meltwater from the [[Fee Glacier]] and supplements winter sports infrastructure by ensuring reliable water supply for [[snowmaking]].<ref name="Waeber 2012"/>

On 30 August 1965 an approximately 2 million-cubic metre ice avalanche broke from the [[Allalin Glacier]] and engulfed the Mattmark dam construction site at the head of the Saastal, killing 88 workers. The accident, the worst alpine construction disaster in Swiss history, delayed completion of the hydro-electric project and led to tighter national safety standards for working beneath hanging glaciers.<ref name="Fenazzi 2015"/>