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.
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.
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.
[Minor Delays / Reroute] 73 Armitage buses are temporarily rerouted via Armitage, Elston and Cortland, due to street blockage at Ashland/Cortland.— cta (@cta) September 30, 2020