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Oregon City reports progress on inflow-and-infiltration work; several high‑priority sewer projects underway
Summary
City engineering staff reported completed I&I work that reduced flows by up to 35% in priority basins, 213 manholes rehabilitated, multiple projects under construction and design, and plans for challenging projects requiring geologic-hazard permits.
City engineering staff and consultants delivered the annual inflow-and-infiltration (I&I) program update on June 17, reporting measurable reductions in sewer system flows and a pipeline of remediation projects.
Kurt Krueger, Oregon City's new city engineer, said the five-year I&I program has completed three projects and rehabilitated 213 manholes to date; two projects are in construction and five are in design. Krueger and Wallace Engineering consultant Dave Brokaw highlighted three completed projects and their budgets: Lynn 1 (about $4.2 million, ~$416,000 under budget), Mall Avenue (about $4.5 million, roughly $118,000 under budget) and a request project that came in well under its original $3.1 million scope.
Program performance metrics showed flow reductions attributable to rehabilitation work: Lynn 1 recorded a 35% reduction in inflow, Rivercrest saw a 12% reduction (at partial completion) and Molalla Avenue achieved a 29% reduction when the project was ~60% complete. Krueger said upcoming work will confront geologic‑hazard overlays and soil challenges and will require additional planning and Type 2 land‑use permits for some segments of McLaughlin 2 and New Basin 1.
Why it matters: I&I reductions lower the volume of stormwater and groundwater reaching the sewer system, defer the need for larger treatment plant expansions and reduce ratepayer costs over time. Staff said the program also generated roughly 75 local construction and engineering jobs.
Next steps: Staff will continue design and permitting for Lynn 3, New Basin 1, Main Street sanitary sewer replacement and McLaughlin 2, and will present progress updates at future commission meetings.
