Cresta Dam drum gates undergoing regular maintenance to improve efficiency and safety
|The drum gates atop Pacific Gas and Electric Co.’s Cresta Dam are scheduled for routine maintenance starting this week. Heavy equipment will operate in the area through November. Photo courtesy Pacific Gas and Electric Co.|
A contractor for Pacific Gas and Electric Co. started work this week to maintain the drum gates atop the Cresta Dam. Occasional and brief traffic delays due to southbound lane closures will occur on Highway 70 as equipment is maneuvered near the dam on the North Fork Feather River, PG&E announced recently.
The work is regular maintenance to ensure the drum gates remain in good working order and to remove sediment buildup inside the drum gate chamber inside the dam. The drum gates sit atop the dam and control storm event water flows by being raised and lowered.While maintenance is underway, required water flows will continue through the radial bypass gate adjacent to the drum gate and through outlets below the dam. Reservoir levels are expected to remain normal, keeping the Cresta Powerhouse operational.
The contractor will use heavy equipment such as cranes and a small barge to do the work. Divers will also be employed. The project is scheduled to be completed in mid-November.
Cresta Dam was completed in 1949 and is one of many PG&E hydroelectric facilities along the North Fork Feather River that comprise the “stairway of power.” Last year, the same contractor — Global Diving and Salvage — performed drum gate maintenance on the nearby Rock Creek Dam.