Shasta Dam Temperature Control Device
Location: Shasta, CA Contract Value:
Valued at $80 million USD, this 7250-tonne temperature control device was installed on the upstream face of California's Shasta Dam in 1996. The device’s purpose was to release varying amounts of water from three depths with a maximum depth of 107 metres while maintaining favourable temperatures for spawning fish downstream. The contract award was largely based on the merit of the ingenious erection scheme designed by Somerset to erect this submerged structure while above water. Hung from the side of the dam, shoring frames supported the towers by threaded rods. As each section was assembled, the towers were lowered by jacks to allow assembly of the higher sections. Once at their final depths, the 1,100-tonne towers were connected to the dam by divers.
