AN ACR MLG NEARLY SLID OFF OF A TXWY DUE TO ICE AND SNOW. IT HAD TO PWR BACK ONTO THE CLR PART OF THE TXWY BEFORE CONTINUING TO THE GATE.

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FO MADE UNEVENTFUL LNDG ON RWY 2 AT IDA. RWY WAS ICE AND SNOW COVERED BUT HAD BEEN PLOWED. ALL 90 DEG TURNOFFS FROM THE RWY WERE CLOSED DUE TO SNOW PILES ON THEM. THE ONLY EXIT OFF THE RWY WAS A 150 DEG R TURNOFF TO THE PARALLEL TXWY. I TOOK CTL OF ACFT ON RWY AND SLOWED TO A VERY SLOW TAXI SPD TO BEGIN THE R TURNOFF TO THE TXWY. EVEN THOUGH I WAS USING R RUDDER PEDAL DEFLECTION IN CONJUNCTION WITH GRADUAL R NOSE WHEEL TILLER DEFLECTION; THE ACFT BEGAN TO SKID OFF THE TXWY CTRLINE. I STOPPED THE SKID AND REMAINED ON THE CONCRETE SURFACE OF THE TXWY. THE ACFT WAS STILL 45 DEGS FROM COMPLETING THE TURNOFF ONTO THE TXWY. THE ACFT TAIL STILL WAS STICKING OUT ONTO THE ACTIVE RWY. I COULD NOT COMPLETE THE TURN ONTO THE TXWY BY GOING FORWARD AS THE WIND ROWS OF SNOW WOULD BLOCK MY PROGRESS. IDEALLY; I SHOULD HAVE ASKED FOR A TUG TO COME PUSH ACFT BACK ONTO RWY; HOWEVER; THE WIND ROWS OF SNOW WOULD HAVE ALSO PREVENTED ANY TUG FROM HOOKING UP TO NOSE GEAR. RATHER THAN STAY STUCK AT TXWY/RWY INTXN AND CLOSE DOWN THE ACTIVE RWY; I ELECTED TO PWR BACK ONTO THE REMAINDER OF RWY TO HAVE ROOM TO COMPLETE MY FORWARD TURNOFF ONTO THE TXWY. I ASKED TWR TO VERIFY THE RWY BEHIND ME WAS CLR SO I COULD EXECUTE THE PWR BACK. THEY VERIFIED CLRNC AND GRANTED PERMISSION FOR PWR BACK. I PWRED BACK ABOUT 15 FT AND THEN TAXIED FORWARD WITHOUT INCIDENT. NEXT TIME I'LL REQUEST TO HAVE 90 DEG TURNOFFS PLOWED INSTEAD OF NEGOTIATING DIFFICULT 150 DEG TURNS ON SNOWY AND ICY PAVEMENT! SUPPLEMENTAL INFO FROM ACN 230228: THE CAPT SAID HE WANTED TO USE REVERE THRUST TO GET OUT; I STATED THAT I DIDN'T THINK WE SHOULD DO THAT WITHOUT GUIDEMEN. WE USED ABOUT 1.3 EPR TO BACK UP; THE SAME AS WE USE FOR PWR BACKS AT THE GATE. I INSPECTED THE ACFT AT THE GATE AND FOUND NO DAMAGE.