District leaders held a groundbreaking ceremony at the site Wednesday where Fresno High's newest gym will be located on campus, which is just north of the main gym.
The second gym will provide more space for athletic events, student activities and PE classes.
The near 17,000-square-foot facility will feature team rooms, restrooms and a snack bar.
The $11.9 million project also includes the construction of eight tennis courts and two basketball half-courts.
The project is expected to take 14 months and be completed by July 2025.