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Apr 22, 2026 - Switzerland Is Replacing a Massive Dam at 2,000 Meters in the Alps in Front of an Active Reservoir



Switzerland Is Replacing a Massive Dam at 2,000 Meters in the Alps in Front of an Active Reservoir

At an elevation of about 2,000 meters in the Swiss Alps, engineers are carrying out one of the most complex dam replacement projects in Europe: constructing a new Spitallamm Dam directly in front of an actively operating reservoir. Instead of draining the lake as is typical in many conventional replacement dam projects, the new structure is being built while the hydropower system continues to operate, supported by a network of connection tunnels, bottom outlet tunnels, and temporary hydraulic control structures that allow engineers to carefully manage water flow throughout each stage of construction while maintaining reservoir safety.
The need for this project comes from the fact that the original Spitallamm Dam has been operating for nearly a century in harsh high-alpine conditions, where concrete structures are continuously exposed to freeze–thaw cycles, large temperature variations, and long-term hydrostatic pressure. As dam safety standards across Europe become increasingly strict, localized repairs were no longer sufficient to guarantee long-term reliability for the Grimsel hydropower system. As a result, Switzerland chose a far more ambitious solution: building an entirely new dam directly in front of the existing one—both to upgrade structural safety and to secure one of the country`s most important alpine hydropower systems for decades to come.
Video Chapters:
00:00 Intro
00:59 Project Overview
02:12 Opening the Grimsel Lakebed Site
04:42 Hydraulic Tunnel Construction
06:54 High-Altitude Concrete Production
09:51 High-Pressure Steel Gate Installation
12:09 The Biggest Challenge
14:25 Conclusion