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Shasta Dam Temperature Control Device

Shasta, California

Valued at US $80 million, this 8,000 ton temperature control device was installed on the upstream face of California’s Shasta Dam in 1996. Its purpose was release varying amounts of water from three depths (to a maximum depth of 350 feet) to maintain favourable downstream temperatures for spawning fish.
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 1,200 ton towers were connected to the dam by divers.