The Kellogg Creek Water Resource Recovery Facility Facility (WRRF) serves the cities of Milwaukie, Johnson City, Happy Valley, and some areas of unincorporated Clackamas County. The existing Kellogg Creek WRRF has sufficient capacity to treat current and projected flows during most of the year. However, WRRF treatment capacity is capped at 25 million gallons per day (mgd). Because peak flows in the Kellogg Creek service area currently exceed 25 mgd during large storm events, excess flow is transferred to the Tri-City WRRF. This practice will continue and will become more frequent due to growth in the Kellogg Creek service area.
Because expansion of the Kellogg WRRF is not planned, current and future projects at the facility will primarily focus on rehabilitation of aging process units and improved treatment efficiency and reliability. There are currently three projects under construction at the facility:
Aeration Basin Improvements
The aeration basins are the heartbeat of the liquid treatment process at the facility, where air is supplied to the biological process to remove organic pollutants present in the wastewater. While the main aeration blowers were recently replaced as part of the 2017 Kellogg Creek Improvements Project, much of the air control valves, instrumentation, and control systems are aged and are being upgraded as part of this project. The project also addresses deteriorating concrete within the basin. The fully refreshed and modernized control logic will provide more energy efficient and reliable treatment. Construction of the improvements began in 2022 and completion is anticipated in the Fall 2023.
Influent Pump No. 2 and 4 Replacement
Sewage arrives to the Kellogg Creek WRRF through a large pipe approximately 30 feet underground. In order to treat the incoming flow through the facility, the Influent Pump Station (IPS) pumps the flow up to ground level using four pumps. The two smaller dry weather pumps were recently replaced due to age as part of the 2017 Kellogg Creek Improvements Project. The two larger wet weather pumps are currently being replaced under this project. The new pumps have been delivered to the site and will be installed during Summer 2023.
Secondary Clarifier Rehabilitation
The secondary clarifiers at the Kellogg Creek WRRF are designed to remove solids from the treatment stream prior to discharge to the Willamette River. The basins were last upgraded in 1994 and are due for rehabilitation. The first phase of this project was completed in 2021 and successfully re-leveled the effluent weirs and replaced corroded portions of the rotating steel mechanism. The second phase of the project, which began in 2022 and is scheduled to be completed in Fall 2023, is set to replace the central drives that rotate the mechanisms, recoat all exposed steel, and repair basin concrete.