According to reports from WHAS11's Reed Yadon, two firefighters were airlifted to University of Louisville Hospital and another firefighter was treated at the scene.
Police said the department's aerial ladder came into contact with a power line.
A witness at the scene, resident director Tyler Arterburn, said the crew was participating in an "ice bucket challenge," and firefighters were spraying water band directors and members.
Arterburn said there will be a prayer vigil at Stapp Lawn on campus at 7 p.m.
Power was out for a brief time in Campbellsville, but has since been restored.