PG&E to Inspect Water Tunnel at Canyon Dam
Published on Jun 22, 2013 - 10:35:45 AM
June 22, 2013 - In keeping with our long-standing commitment to safety, Pacific Gas and Electric Company (PG&E) will drain and inspect the water outlet tower and tunnel at Canyon Dam on Lake Almanor following the May 23 Canyon Dam earthquake. The public may notice workers and equipment at the site June 28 to July 20.
Immediately after the May 23 earthquake, PG&E inspected hydroelectric facilities and even continued to perform foot and air patrols for more than a week. Although the earthquake caused no visible or detectable issues according to our instrumentation, PG&E is inspecting the intake tower and discharge tunnel at Canyon Dam as a precaution.
PG&E is draining the tower and 1,354-foot tunnel that carries water from the outlet tower on Lake Almanor to the North Fork Feather River. PG&E's contractor will place a barge and floatation devices at the outlet tower near Canyon Dam to perform the inspection work.
A helicopter may be used to place water pumps on the spillway to pump from the lake so water can continue flowing to the river. Divers will inspect the outside of the tower.
The pumps will draw water at a similar depth to the tower gates so outflows into the river will be of the same temperature as is normal for this time of year.
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