The Metropolitan Wastewater Treatment Plant (WWTP) was constructed in 1936 to treat wastewater from the Twin Cities area. To direct flow to the new facility in St. Paul, large-diameter interceptors were constructed, using combined sewer overflow (CSO) regulator structures to capture dry-weather flow for treatment. Metropolitan Council Environmental Services (MCES) hired Brown and Caldwell to modernize and reconfigure Emergency Relief Structure ERS04 and rehabilitate approximately 800 feet of the downstream sewer tunnel(s). The tunnels and two badly corroded drop shafts required rehabilitation design based on scant inspection data. Minnehaha Falls Park, immortalized in Longfellow’s “The Song of Hiawatha” and visited by U.S. presidents, is a jewel to the City of Minneapolis and the site of this complex project. Disruptions to about 850,000 annual park visitors, nearby residents, and groundwater that feeds a legally protected spring, were prohibited. Public involvement and an innovative design approach led to successful implementation with minimal disruption.

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