Firefighters arrived around 7:53 a.m. along Puddingstone Drive between Raging Waters Boulevard and Walnut Avenue.
The 20-foot speed boat was completely engulfed as it floated on the Puddingstone Reservoir at Frank G. Bonelli Regional Park.
The boat did not appear to be occupied. There were no reports of any injuries.
A lifeguard boat was seen on the lake, but it did not appear to have equipment to put the fire out.
Firefighters extinguished the blaze at 8:12 a.m.
The charred boat was towed from the scene. The cause of the blaze was not immediately known.