The construction of the Spitallamm replacement dam is expected to take six years from June 2019 to autumn 2025. The following work is planned during the summer months of the respective years.
2019
- Building site facilities
- Excavation of the access tunnel
- Preparation and start of the foundation excavation using explosives
2020
- Excavation of foundations using explosives
- Excavation of inspection walkways on level -1 to level -4 using explosives
- Excavation of the access tunnel to the new equipment room
- Excavation of the lift shaft
- Assembly of the gravel quarry and the concrete plant
- Concrete tests
2021
- Assembly of the cranes for concreting work
- Continuation of the concrete tests
- Concreting of the dam (preseason)
- Excavation of the equipment room and lower discharge tunnel
2022
- Concreting of the dam (first season)
2023
- Concreting of the dam (second season)
- Interior development and outfitting of the equipment room
- Rock grout and grout injections
2024
- Concreting of the dam (third season)
- Rock grout and grout injections
2024 / 2025
- Connection of the lower discharge tunnel to Lake Grimsel
- Rock grout and grout injections
2025
- Completion of the dam crest
- Disassembly of equipment and plant