This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated.

CHICAGO (WGN) — Heavy rains have caused widespread flooding across the Chicago area, including the basement of the Willis Tower.

Crews were downtown Monday morning working underground to address power outages created by flooding over the weekend.

Flooding from the Chicago River has also affected the ComEd substation at the Willis Tower.

ComEd was working with the city and Willis Tower officials to assess the situation. The high-rise was the only building that was impacted.