The break occurred at about 5 a.m. Initially, Chicago Street is closed between State Street (Illinois Route 31) and Crystal Street.
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By 11 a.m. northbound State Street was back open, with southbound State Street expected to reopen by noon. Cleanup is expected to continue for the rest of the business day, a city official said.
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Chopper 7HD flew above the scene as muddy-looking water gushed from the break and covered the streets nearby in around a foot of water.
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Emergency crews were on the scene working to cap the break.