The City of Spokane is embarking on its largest Combined Sewer Overflow (CSO) tank yet. According to the City of Spokane website, CSO 24 will have the capacity to hold over 2,000,000 gallons of combined sewage. Construction on this tank will begin in mid-January on land to the west of Adams Street between Sprague and 1st Avenue. The map below was borrowed from a City presentation and shows initial traffic impacts. Click to view it full size.

Once CSO 24 is complete it will collect combined sewage from most of the south hill and the west part of downtown Spokane. This project will be built in three phases. Phase 1 will start in January and includes all the preliminary work for the tank. Phase 2 is the construction of the CSO tank and will take 18 months to complete. Currently, Phase 3 is in the design phase and includes the landscaping work which will be above the tank.

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