Lai da Marmorera, Hydroelectric reservoir in Grisons, Switzerland

Lai da Marmorera is a reservoir in the Grisons Alps within the Parc Ela nature park, held back by the Marmorera dam completed in 1954. Its opaque turquoise water fills a valley between steep slopes of dark coniferous forest, with snow-dusted peaks rising behind. The Julier Pass road runs along one shore, and the village of Marmorera stands above the western end near the ruins of Marmels Castle.

The Marmorera dam, known as Castiletto, was completed in 1954 and inaugurated on 14 September 1955 in the presence of Zurich mayor Emil Landolt and local politician Gion Not Spegnas. The old village of Marmorera was blown up and flooded, and a new village was built above the reservoir and the Julier Pass road. Many inhabitants chose to leave rather than move to the replacement village.

The lake lies in the Romansh-speaking Surses valley, and its Romansh name is Lai da Murmarera. The only village on the shore is Marmorera, rebuilt above the water after the old settlement was destroyed. The 2007 Swiss mystery film "Marmorera" was shot in the village and at the reservoir.

The reservoir is accessible from the road leading to Julier Pass and offers opportunities for water activities and walks along the shoreline. Visit during warmer months when the mountain road is fully open and snow-free for the easiest access.

Beneath the water surface lie the remains of the original village of Marmorera, submerged when the dam was built. This sunken settlement serves as a quiet reminder of the human cost that comes with hydroelectric development.