Advanced American Construction was contacted by Rocky Mountain Power (PacifiCorp) to assist with a slide gate that was stuck in the closed position. They dam operators were anticipating a rise in water elevation in the dam forebay and wanted to avoid utilizing the overflow spillway.
In May of 2018, AAC mobilized a dive crew to Kemmerer, Wyoming to diagnose the slide gate issue and find a way to temporary get the gate open. Once onsite, the crew battled challenging weather conditions, high altitude and limited access to get the gate in the open position.
With the gate temporary placed in the open position, PacifiCorp commissioned AAC under a Design-Build contracting method to repair the slide gate and its mechanical operator. AAC engaged an engineering firm and worked closely with Rocky Mountain Power to replace the aging stem-rod style gate operating assembly with a new hydraulically actuated cylinder, fabricated protection plates, hydraulic power unit and electronic position indicators.
AAC re-mobilized to the site in June of 2019 to remove the aging and damaged components and install the new hydraulically operated system. The team again faced challenging weather, high altitude (7,000+ feet) and limited access. The dive crew performed weeks of highly orchestrated and technical dives in order to make the limited bottom time of each diver productive. The new assembly was installed and tested by July of 2019.