During periods of spill, Cabinet Gorge Dam can generate total dissolved gas (TDG) concentrations in excess of water quality standards. Our team provided full hydraulic and structural engineering services from feasibility through design and construction for the modifications to five of the eight spill bays in order to reduce TDG. We prepared construction plans, specifications, and produced documentation for submittal to FERC. We also provided construction technical support.

In additon to the work done to reduce TDG, Alden engineers also performed several structural projects for Cabinet Gorge Dam:

  • A Stoplog Deployment Crane was designed and fabrication-level drawings developed for the deployment crane system for lifting 10-ton stoplogs. The steel frame was designed to allow assembly and disassembly at each of the eight spill bays. Performance specifications for the 15-ton top running hoist were also provided
  • The STI was reviewed and updated for Section 6 – Hydrology / Hydraulics and Section 8 – Stability / Stress Analysis of the FERC Supporting Technical Information (STI) Document.