River intake valves shut off until contaminated water passes.
A mysterious chemical leak from West Virginia will invade the Tri-State Tuesday night by way of the Ohio River.
Pollution expected to reach downtown by 9 p.m.
Greater Cincinnati Water Works said the chemical was identified in an upstream river sample late Tuesday evening. The sample came from the water at Meldahl dam, about 25 miles upstream from the city's treatment plant.
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