PITTSBURGH (KDKA) — The Armstrong Tunnel is closing on Saturday night.

Allegheny County said the Armstrong Tunnel will close starting at 10 p.m. on Saturday for repairs.

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It will reopen at 8 a.m. on Sunday after Duquesne Light finishes emergency underground cable repairs.

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Inbound traffic will be detoured using Second Avenue, Ross Street, and Forbes Avenue.

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Outbound traffic will be detoured using Forbes Avenue, Chatham Square, Fifth Avenue, Grant Street, and Second Avenue.