The Northeast Ohio Regional Sewer District (NEORSD) has chosen Hatch Mott MacDonald, in a joint venture with MWH Global, for a major contract to design the Westerly Combined Sewer Overflow (CSO) Storage Tunnel and Dewatering Pump Station in Cleveland, Ohio.

The Westerly Storage Tunnel will help prevent combined sewer overflows by providing 36 million gallons of storage. The tunnel will be built beneath the Ohio City neighborhood west of Downtown Cleveland, and will capture 98% of the annual combined sewage in the Westerly District.

With a total construction value of approximately $200 million, the project also includes the design of a new Tunnel Dewatering Pump Station to dewater the tunnel to the existing Westerly Wastewater Treatment Center on Lake Erie. 

“This is the same JV that successfully designed the NEORSD Dugway CSO Storage Tunnel, which is now under construction. Prior to that, HMM was the design lead for the award-winning Euclid Creek Tunnel, which is also in construction and scheduled to be completed later this year. We are proud of the work we have done with NEORSD, and we are pleased to be collaborating with them on another important project,” said Nicholas DeNichilo, President and CEO of HMM.