Jessica Fisher

City of Spokane Building Its Largest CSO Tank Ever

Jessica Fisher, Public Information Assistant, No Phone Number Available

Tuesday, December 6, 2016 at 9:58 a.m.

City of Spokane Building Its Largest CSO Tank Ever

The City of Spokane is embarking on our largest Combined Sewer Overflow (CSO) tank. The new tank, 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; the tank location will be on the land to the west of Adams Street between Sprague and 1st Avenue

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

CSO tanks are crucial for the health of the Spokane River. In older Spokane neighborhoods there are usually combined stormwater and wastewater sewers. During heavy rainstorms or rapid snowmelt the extra flow can exceed the capacity of the pipes. The excess overflows into the Spokane River. In order to protect and clean up the river the City of Spokane has now built sixteen CSO tanks.

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