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Six-mile, $175 million MSD tunnel project on track, below south St. Louis County

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June 22, 2023

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A massive tunnel that will ultimately be more than 6 miles long is taking shape deep beneath parts of south St. Louis County – a project the region’s sewage utility says will help address overflow and water quality problems that have affected the nearby Meramec River.

Six-mile, $175 million MSD tunnel project on track, below south St. Louis County