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January 31, 2007
THALLE CONSTRUCTION COMPANY WINS "BEST UTILITY" PINNACLE AWARD Columbia Hydroelectric Fish Passage, Columbia , SC
Contractor: Thalle Construction Company, Hillsborough , NC
 For over 100 years a dam at Columbia 's Broad River had blocked the path of migratory fish. Thalle's environmentally sensitive project involved construction of a ladder to allow the fish to overcome the dam and move upstream, plus construction of a downstream fish passage structure to allow migrating fish to return to the ocean. Because the fish ladder and the minimum flow gate were not adjacent-- but instead separated by 3.5 miles of canal-- 2 separate cofferdams were required to allow the dam demolition and protect the new construction, and then had to be redesigned to meet changing conditions.
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