CHICAGO (CBS) — Testing on the Lake Street Bridge will begin Friday morning, closing the bridge to traffic.

It will be closed beginning Friday at midnight through 5:00 a.m. over the South Branch for balancing and testing.

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That’s according to the Chicago Department of Transportation.

The testing is ahead of the upcoming boating season.

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The Chicago Sun-Times reports eastbound traffic on Lake will be rerouted through Clinton, Washington and Wacker.

Westbound traffic will be rerouted along Wacker, Randolph and Canal.

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Those using public transportation are asked to check CTA’s website to see how the closures will affect bus and train service.