A block in the sewage system at Kelso High School Friday morning caused a backup in one of the school's hallways, according to Principal Christine McDaniel.
As a result, some bathrooms were closed and most classes in A Hall were re-routed to other parts of the building, according to a press release. Only one classroom was directly affected by the sewer problems, said Superintendent Mary Beth Tack.
The issue has been fixed but classes remained re-routed for the remainder of the day.
"As always, the health, safety and education of our students remain our top priorities," McDaniel said in the release. "Carpets and surface areas are being cleaned and disinfected and air filtration devices are in place."
School administrators learned about the blockage before school started, and promptly closed the hallway, Tack said.
Tack said the school expects to reopen A Hall and the affected classroom Monday.
"This weekend gives us a time to make sure everything is cleaned up. ... We are fortunate for that," Tack said.