Bend, Ore. — PacifiCorp will lower the Mirror Pond water levels next week to facilitate another inspection of the dam.
The inspection will be conducted by Gannett Fleming, an engineering firm from Phoenix, for the Bend Parks and Recreation District as part of deliberations around the potential acquisition of the dam from PacifiCorp to maintain Mirror Pond after the facility is no longer used to generate electricity.
The drawdown will begin Tuesday morning and will continue gradually until about midday on Friday. The pond will be allowed to refill starting Friday afternoon and should be full again by the Sunday morning. The inspection itself is scheduled to occur on Thursday and Friday. According to BPRD employee Jim Figurski, for safety and security reasons, access to the inspection will be limited to BPRD personnel, the inspectors and PacifiCorp.
Because of increased flows compared to last October when the Mirror Pond was drawn down to facilitate a PacifiCorp inspection, water levels are not expected to drop as dramatically this time, although it will likely be noticeable.
As was the case during the October drawdown and refilling of Mirror Pond, PacifiCorp will monitor water quality and conduct fish surveys consistent with state regulatory requirements.
PacifiCorp inspected the dam on October 31 after a leak developed in one of the structure’s wooden panels. The inspection concluded that while the facility was safe, it would not be cost effective to rebuild the entire facility to generate power for current and future generations of customers across PacifiCorp’s six-state territory. Since then, the company and representatives of the Bend Parks and Recreation and the City of Bend have been in discussions around potentially transferring the dam to a local entity so the community can realize its vision for the future of Mirror Pond.
PacifiCorp has announced plans to install sheet pile reinforcement in front of the leaking panel. The reinforcement work is planned to take place in April, or earlier if permitting is complete and a contractor is in place. The company does not anticipate needing to lower Mirror Pond levels again for that procedure.