A PA46 PLT INADVERTENTLY TAXIED ONTO THE WRONG RWY DUE TO CONFUSION ABOUT THE RWY SIGNAGE.

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I WAS CLRED TO CROSS RWY 4 AND CLRED FOR TKOF ON RWY 35. AT THE RWY INTXN; AS I PULLED OUT ON RWY 4; I SAW A SIGN FOR RWY 35. AS I LINED UP TO TAKE OFF; I REALIZED I WAS ON RWY 4; BY LOOKING AT MY HSI; AT THE SAME TIME THE TWR CTLR CAME ON AND SAID; 'STOP TKOF ROLL; YOU ARE ON RWY 4; WHICH IS CLOSED.' I TOLD HIM I HAD JUST REALIZED THAT AND HE GAVE ME PERMISSION TO TAXI ONTO RWY 35; POS AND HOLD. I HAD NOT STARTED MY TKOF ROLL; BUT FROM THE TWR; IT MIGHT HAVE LOOKED THAT WAY. THE ARPT DIAGRAM IS CLR; BUT THE WAY IT IS SIGNED; IT'S EASY TO THINK YOU'RE ON RWY 35 WHEN YOU FIRST PULL OUT ONTO RWY 4 TO CROSS. THERE WAS NO CONFLICT AND I WAS CLRED TO CROSS. I DIDN'T START TKOF ROLL; BUT IT WAS CONFUSING. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THAT THERE IS NO RWY SIGN FOR RWY 4. THE LOCATION OF THE RWY SIGN FOR RWY 35 AT THE INTXN OF RWY 4/35 SEEMS LIKE IT WAS FOR THE RWY THAT HE TURNED ON. THE RPTR FEELS THAT THIS IS AN EASY MISTAKE TO HAVE SINCE THE ONLY RWY SIGN THAT ONE CAN SEE IS FOR RWY 35. THE RPTR ALSO STATED THAT THERE WAS SNOW AND ICE IN THE AREA THAT COULD HAVE POSSIBLY BLOCKED THE RWY SIGN FOR RWY 4.