CAPT OF ACR HVT ACFT LOST CTL OF THE ACFT AT THE END OF THE LNDG ROLL BECAUSE OF LACK OF EFFECTIVE BRAKING ACTION DUE TO SNOW AND ICE.

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LNDG HVT AT TOLEDO EXPRESS ARPT. ACFT TOUCHED DOWN ON SPD IN TOUCHDOWN ZONE. THEIR WAS NO PRECIPITATION OBSERVED ON FINAL. ATIS RPTED LIGHT SNOW. RWY WAS MOSTLY CLR ON TOUCHDOWN AREA. DECELERATION SEEMED NORMAL UNTIL PASSING RWY 16/34. AT THAT POINT RWY DIDN'T SEEM TO BE PLOWED BRAKES SEEMED TO BE INEFFECTIVE. THERE WAS NO RPTED RWY CONTAMINATION RPTED ON ATIS OR TWR FREQ. I FELT THE BRAKING ACTION WENT FROM GOOD TO NIL INSTANTANEOUSLY. MR X (FAA) AND I WENT OUT TO ACFT TO INSPECT THE AREA AND ACFT AND FOUND PACKED SNOW ON ICE AT THE FINAL 300 FT OF RWY AND START OF THE TAXI STRIP. ON LNDG; TWR GAVE ME THE OPTION TO TURN OFF ON RWY 34/16 OR TAXI TO THE END OF RWY 7 AND TURN OFF. I CHOSE TO TURN OFF AT THE END OF RWY 7. AS I PASSED RWY 34/16 I NOTICED RWY 7 HAD NOT BEEN PLOWED PASSED THAT AREA. AFTER THAT POINT BRAKING ACTION BECAME NIL AND WITH REVERSERS AND BREAKING; I WAS UNABLE TO STOP AND WENT OFF THE END OF RWY 7. I FEEL IF ATIS OR TWR WOULD HAVE MENTIONED THE CONDITION OF THE RWY THIS INCIDENT WOULDN'T HAVE HAPPENED. AT THIS TIME I'M SCHEDULED TO TAKE A PC CHK IN THE SIMULATOR AT DEN MAR/WED/93.