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After 40 years, Chicago's Deep Tunnel project is complete

Take a last look before Thornton Reservoir fills and finishes a chapter of Chicago public works history.

SHARE After 40 years, Chicago's Deep Tunnel project is complete
After 40 years, Chicago's Deep Tunnel project is complete

WBEZ/Andrew Gill

The Thornton Reservoir is the final stage of the TARP tunnel project. When the former limestone quarry to Chicago’s stormwater runoff system fills, it will add 7.9 billion more gallons of capacity to Chicago’s stormwater runoff system.

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