The La Crosse Fire Department was called to the Gateway Terrace Condominiums at 100 North 6th Street at 9:18 a.m. after a fire alarm was reported.
Crews found smoke and fire in one of the units.
Battalion Chief Jeff Schott said the sprinkler system in the condo was working properly and is believed to have kept the fire from spreading to other units.
The condo itself had moderate smoke, fire, and water damage according to Chief Schott.
Other condos in the building were also damaged by the water from the sprinkler system.
No one was injured in the incident.
The cause of the fire is still under investigation.