To put an end to annual flooding at Cloquet High School, the school district will waterproof the exterior foundation of two north facing walls.

The building was constructed in 1967. Water has been entering through its foundation and flooding hallways near classrooms for almost 10 years, said Dylan Carlson, director of school facilities and grounds. He said the problem areas are two north facing walls at the back of the school.

Carlson, who began his job in March, has not seen the flooding, but he has seen evidence of water damage on interior walls.

“Fortunately, the flooring is poured concrete so no water damage,” Carlson said.

Waterproofing of the exterior foundation will begin this week and should be completed by the end of summer, he said.

The project is expected to cost $500,000 and will be paid for out of the long term facility maintenance fund and leftover bond money, said Candace Nelis, Cloquet School District business manager.