KING AIR PLT SUSTAINS LOSS OF CTL AND ACFT DAMAGE AFTER CONTACTING OFFSET BERM OF SNOW LEFT BY SNOW PLOW AT S87; ID.

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WE CONTACTED BOISE FSS AT APPROX XD25 LCL; WE RECEIVED AN UPDATED WX BRIEFING INCLUDING NOTAMS FOR OUR FLT FROM TWIN FALLS; ID; TO WEISER; ID. THERE WERE NO NOTAMS ISSUED FOR WEISER ARPT. AT APPROX XD40 LCL; WE DEPARTED TWIN FALLS; ID; ON AN INST FLT PLAN TO ONTARIO; OR (CLOSEST ARPT WITH AN INST APCH). AFTER DSNDING THROUGH 10000 FT MSL WE FOUND OURSELVES; AS EXPECTED; IN VFR CONDITIONS. OUR OBSERVATIONS OF THE CURRENT WX AT THE TIME WERE 10000 FT OVCST WITH VISIBILITY OF 35+ MI. THIS WAS CONFIRMED BY VISUAL SIGHTING OF BOTH THE ONTARIO; OR; AND WEISER; ID; ARPT BEACONS. GPS DISTANCE AT THIS TIME WAS 25 MI TO WEISER; ID (S87). SURFACE WINDS AT S87 WERE CALM. WE CANCELED OUR IFR FLT PLAN AND MADE OUR DSCNT FOR THE APCH TO S87. AFTER OUR DSCNT; WE ACTIVATED PLT CTLED LIGHTING (ARPT LIGHTING) OVERFLEW THE ARPT; AND MADE L TFC TO RWY 30. THE RWY; TO OUR OBSERVATION FROM THE AIR; APPEARED CLR; LIGHTING WAS OPERATIVE; WITH SNOW ON THE RWY. AFTER A NORMAL APCH; FLARE AND TOUCHDOWN; WE SLOWED THE ACFT USING REVERSE THRUST. AT APPROX 50 KTS; THE L MAIN LNDG GEAR STRUCK AN OFFSET BERM NEAR THE CTRLINE OF THE RWY LEFT BY THE SNOWPLOW; THE OPERATOR NEVER COMPLETED THE PLOWING OF THE RWY. THE ACFT TURNED UNCTLABLY 90 DEGS BACK TO THE R PARALLELING RWY 30 ABOUT 30 FT S OF THE RWY. THE ACFT; ACCORDING TO POLICE RPTS AND MEASUREMENTS; EXITED THE RWY AND SLID ABOUT 110 FT. THERE WAS NO FIRE AND NO APPARENT INJURIES. THERE WERE NO PAX ON BOARD. THIS WAS A PART 91 PLEASURE FLT. CAUSE OF INCIDENT WAS IMPROPERLY PLOWED RWY.