Utah
Logan 1st Dam, located on the Logan River, was constructed in 1914 and consists of three sections: a slab-buttress, spillway, and powerhouse section. Evaluation of the dam determined that the spillway capacity is inadequate to safely pass the design flood and the structure is unlikely to withstand the design earthquake (an active fault is located in the left abutment). As a result of the evaluation, the State Engineer issued official notice to the dam's owner, Utah State University, that the dam does not meet state standards and must be rehabilitated.
TCB was retained to review previous studies and complete engineering, designs and construction management for rehabilitating the dam. TCB’s design for rehabilitation included:
RCC buttress sections to raise the dam four feet and stabilize the dam’s slab-buttress section
RCC overtopping protection to protect the downstream toe of the dam
A relocated powerhouse with an axial flow turbine to replace the existing Francis turbine
Pneumatic leaf gates to improve control of the spillway and increase spillway capacity |
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