Two people were in the boat, myself and one other person. Our destination was the 2 Mile Bridge west ramp and then home.  The main engine was started and running. The boat was on plane going approx. 30 mph heading approx. south/west.  I was making a slight change of direction to the left (south), with the steering wheel.  At this point I discovered that the steering wheel, when turned, would not turn the main motor.  The boat had non responsive steering, and made a rapid and extreme left turn.  The vessel ejected both passengers out into the water and appeared to "barrel roll". The boat capsized and was upside down at this time.  We were able to swim to the boat and climb on to the hull and get out of the water. We waited approx. 1 hour before another boater saw us and rendered aid. The boater was able to let us ride in his boat as he towed the disabled boat to the west ramp on the 2 mile bridge.

Operator completed report.
West Tawakoni                 