A parcel across from the intersection of Kane and Chaney Streets near the west end of Dubuque was selected as the site for the school.

In 2005, construction commenced on the Mazzuchelli expansion, which utilized the west wing of Wahlert and a new addition next to the school.

Wahlert Catholic High School is located at 2005 Kane Street on the east side of Dubuque, Iowa, 52001.

Sports currently offered to boys include football, cross country, basketball, wrestling, bowling, golf, tennis, track, soccer, baseball, and swimming (co-op with Dubuque Community Schools).

Sports offered to girls include cross country, swimming, volleyball, basketball, bowling, golf, tennis, soccer, and softball.