- Start
- Dec 31, 202550% CONFIDENCEfrom the source
New Spitallamm Dam Replaces Century-Old Cracked Wall
- Kraftwerke Oberhasli AG (KWO) is replacing the 1932 Spitallamm dam on the Grimsel Pass with a new double-curvature arch dam built directly in front of it from 2019 to 2025[2][3]
- The old dam, which needed strengthening, stays in place and will later be flooded, with a tunnel balancing the water level[2][3]
- The new dam is 113 m high with a 212 m crest and over 223,000 m3 of concrete, at the same crest height as the old one, allowing a later raise to enlarge Lake Grimsel[3]
- A joint venture of Frutiger AG, Implenia (42.5%) and Ghelma AG builds it; contract volume is around CHF 100 million[3]
- Construction began in May 2019 at 1,650 to 1,980 m above sea level; the facts box gives completion October 2025, though the text says 2026[3]
References 365% CONFIDENCE
The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
- [1]50%youtube.com/watch?v=k0vxzYvIHUkyoutube.com· Posted Sep 22, 2026· Starts Dec 31, 2025 ✓· 33% of score
Sources place the new dam's completion in 2025 - some reporting it already in operation by autumn 2025 - with the powerplant's full restart following in 2026; no single confirmed completion date was found.
- [2]70%Ersatzneubau der Staumauer Spitallamm der KWO - swissdamsswissdams.ch· Added Sep 22, 2026· 33% of score
Swissdams (in French) states KWO is replacing the dam "de 2019 à 2025" (from 2019 to 2025), corroborating a 2025 completion target close to the pin's stored 31 December 2025 date.
- [3]74%Staumauer Spitallamm - Grimsel | Impleniaimplenia.com· Added Sep 22, 2026· 33% of score
Implenia, a contractor on the project, gives an October 2025 completion in its facts summary but a 2026 target in its narrative text - an ambiguity the reference itself flags, consistent with the pin's lower "estimated" confidence and its own note that no single confirmed date was found.
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