Emergency crews could be seen responding just after 6 a.m. to the intersection of Ashland Avenue and Cortland Street in Bucktown for the incident.
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The break occurred in the 1800-block of North Marshfield Avenue, a spokeswoman with the Chicago Department of Water Management confirmed.
It flooded the viaduct at 1900 N. Elston Ave.
Water Department officials said the water main was repaired as of 5 p.m. and water service was being restored to the area. Crews were still on site cleaning up at that time.
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The CTA temporarily rerouted 73 Armitage buses via Armitage, Elston Avenue and Cortland just before 6 a.m. due to the street blockage. The reroute ended just after 7:30 a.m.