The Lake Oswego City Council has adopted a long-range plan for the city’s sewer infrastructure.

The council approved the new wastewater master plan Tuesday night.

The goal, Assistant City Engineer Erica Rooney said, is to minimize the potential for system failures, to minimize the costs of dealing with infrastructure problems and to minimize or eliminate the potential for sewer overflows.

In all, the work is expected to cost about $70 million over the next few decades.

Financing remains up in the air. The city council will need to decide how much to raise sewer rates by and how quickly to hike up charges to fund the projects.

The wastewater master plan is required as part of the city’s comprehensive plan. It has been updated two other times over the past 45 years. The last review was in 1989. The new plan aims to guide sewer infrastructure projects through 2045.

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