Portland, Ore., will wrap up its 20-year, $1.4 billion project that included construction of huge underground tunnels to limit untreated sewage and storm-water overflows into the Willamette River and the Columbia Slough. It is considered the biggest public-works project ever done by the city. The combined sewers and additional pump facilities have been running since September, with final touches to be concluded by Dec. 14.

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