DURING A HVY SNOW FALL; WITH LATEST BRAKING ACTION RPTED 'UNKNOWN;' A DC-9 LANDED AND LOST DIRECTIONAL CTL.

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WX WAS 400 FT OVCST; 1/2 MI VISIBILITY; WIND 050 DEGS AT 11 KTS. ON ILS RWY 35L APCH; TWR RPTED BRAKING AS GOOD. JUST INSIDE OM; TWR CHANGED AND SAID BRAKING UNKNOWN. ON TOUCHDOWN; APPROX CTR OF RWY; ACFT STARTED TO SLIDE L. I TRIED TO STOP SLIDE WITH RUDDER BUT SLID OFF WITH L MAIN. STOWED REVERSERS DURING THIS TIME AND THEN NOSE GEAR WENT OFF. I MANAGED TO GET NOSE GEAR BACK ON RWY BEFORE STOPPING. ACFT STOPPED WITH L GEAR OFF RWY. NOBODY HURT; VERY CALM PAX AND DEPLANED AFTER VANS SHOWED UP. WE RPTED NIL BRAKING TO TWR. WE WERE UNAWARE OF HVY SNOW FALL; OVER AN INCH ON RWY AND ANY BRAKING ACTION OTHER THAN GOOD. VERY MINOR ACFT DAMAGE. SUPPLEMENTAL INFO FROM ACN 300300: FLT WAS GIVEN BRAKING ACTION 'GOOD' AT APPROX XA30Z. FLT LANDED AT XA44Z. NO ONE WAS HURT. ACFT WAS FERRIED OUT OF GFK AFTER MINOR REPAIRS. THE CAPT TOLD ME HE WAS UNABLE TO CTL THE ACFT DUE TO 'NIL' BRAKING ACTION. IT IS MY OPINION THAT THE PEOPLE RESPONSIBLE FOR CLEANING THE RWY AND TAKING THAT BRAKING ACTION RPT WERE WRONG.