About 46,000 gallons of sewage spilled from a sanitary sewer into the Jones Falls on Friday, according to the Department of Public Works.
The overflow stopped around 5 p.m. that day. It happened at an underground a "structured" overflow system in East Baltimore that was designed as part of Baltimore's sewer system more than 100 years ago.
These structured overflows are in the process of being eliminated as part of the city's $1 billion sewer rehabilitation.
The sewage didn't spill into any city streets, but the department of public works always recommends staying away from urban streams after extended periods of heavy rain because they could be filled with pollutants.