The 37th Street sewer project was part of Chicago’s ambitious $7-billion “Building a New Chicago” infrastructure improvement program. The objective of this project was to reduce the number of storm overflows by increasing the combined sewer capacity for an area on the north side of McKinley Park. This included the installation of approximately 1,000 feet of 84-inch-diameter jacked in place sewer, 4,000 feet of up to 84-inch-diameter sewer, as well as tumbling basins, large connection structures, and private drain connections. A unique challenge was reconstructing the sewers and arterial streets in the midst of business and residential areas, requiring close coordination of street closures and service interruptions.