Clean Rivers Tunnel in Washington, D.C.

All across Washington, D.C. a polka dot trail of cavernous holes pierces the landscape. These shafts are only the tip of the iceberg on one of the city’s largest infrastructure efforts: An 18-mile-long sanitary subway called the Clean Rivers Project that aims to do for the Potomac what the “Back2Good” rehab did for the city's Metro system.

Washington is one of about 700 cities in the United States sitting on an aging set of combined sewage overflow (CSO) tunnels. CSO’s were the...

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