The contractor working for the Seattle Department of Transportation (SDOT) will completely close First Avenue South between Horton and S Spokane streets tonight to make emergency repairs to temporary shoring for the new Spokane Street Viaduct First Avenue S on-/off-ramp. The shoring was knocked out of alignment this morning after being struck by a truck. The closure begins at 11 p.m. with the expectation that lanes will re-open for use by 5 a.m. Wednesday, April 20. Detours will be provided for both southbound and northbound traffic.

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