GENERAL INFORMATION: 503-823-7404
1120 SW Fifth Ave, Suite 600, Portland, OR 97204
The draining process began on February 9 and lasted just under three weeks. Throughout the entire operation, the flowrate of water into Johnson Creek was monitored 24-hours a day by the Water Bureau’s Water Control Center. Water Bureau operating engineers routinely tested the water for temperature, pH, and chlorine residual, ensuring that acceptable discharge parameters and environmental regulatory requirements were met. No chlorine residual was detected at any time during the discharge.
The reservoir will now receive a thorough cleaning and inspection.
Since the draining process began on Monday, February 9, operating engineers have been routinely testing the water for temperature, pH, and chlorine residual. No chlorine residual has been detected.
On Thursday, February 19, draining into the creek from the reservoir will begin occurring 24-hours a day, instead of just during normal work hours. This decision culminated from a reduction in stream flow and a low chance for precipitation.
The flowrate of water into Johnson Creek will continue to be monitored 24-hours a day by the Water Bureau’s Control Center. Routine testing of the water will carry on throughout the operation to ensure acceptable discharge parameters and environmental regulatory requirements are met.
In an estimated 15 days, Powell Butte Reservoir 1 will be completely emptied and will undergo a routine cleaning and inspection to ensure sanitary and structural integrity.
Water Bureau operating engineers will slowly drain the approximately eight-million gallons of water currently in Reservoir 1 into Johnson Creek. The engineers will be on site during work week hours to supervise the operation.
The flowrate of water into Johnson Creek will be monitored 24-hours a day by the Water Bureau’s Control Center. Frequent testing of the water for turbidity, temperature, pH, and chlorine residual will occur throughout the operation, ensuring acceptable discharge parameters and environmental regulatory requirements are met.
Once the draining is complete, the reservoir will undergo a thorough cleaning and inspection.
Reservoir 1’s draining is estimated to be complete by Wednesday, February 25.
Powell Butte Reservoir 1, along with the newly operational Reservoir 2, are valuable assets to the water infrastructure. The two 50-million gallon underground tanks will help provide sufficient drinking water storage capacity to meet anticipated future growth in demand for water.
The Water Bureau follows strict guidelines and maintenance schedules to ensure the reservoirs are kept at optimal levels of operation. The underground reservoirs receive a thorough cleaning and inspection every five years to ensure structural and sanitary integrity.
For questions regarding reservoir maintenance, please contact Tim Hall, Public Information, at 503-823-6926 or by e-mail at: Tim.Hall@portlandoregon.gov.
Visit the project webpage at: www.portlandoregon.gov/water/powellbutte.