RWY EXCURSION AT NON TWR ARPT.

Narrative

I WENT TO THE LCL FIELD TO RENT THE PIPER WARRIOR I USUALLY FLY. AFTER WKS OF SNOW AND RAIN; IT WAS THE FIRST CLR DAY AND I PLANNED TO FLY FROM 33N TO 1W6 TO PICK UP MY BROTHER-IN-LAW FOR A PLEASURE FLT. I HAD OBTAINED A WX BRIEFING AND CHKED THE CHARTS FOR INFO ABOUT MY DEST. 1W6 IS A PVT GRASS STRIP I HAD DRIVEN PAST BUT NEVER LANDED AT. I TRIED CALLING THE PHONE NUMBER LISTED ON THE AOPA DIRECTORY BUT GOT NO ANSWER. TKOF TO THE E WAS UNEVENTFUL AND AFTER ABOUT 30 MINS; I FOUND THE FIELD. CIRCLING THE STRIP; I IDENTED AN E/W RWY AND NOTICED THE EASTERN HALF OF THE RWY WAS PARTIALLY SNOW COVERED. I IDENTED WHAT LOOKED LIKE TIRE TRACKS AND CAME AROUND FOR A DOWNWIND APCH. I TOUCHED DOWN AT THE END OF THE FIRST THIRD OF THE RWY BUT WHEN I APPLIED THE BRAKES; THE ACT DID NOT SLOW DOWN. BY THE TIME I REALIZED I WAS SKIDDING; I REALIZED THERE WAS INSUFFICIENT RWY LEFT TO GAR. I CONTINUED TO SKID ON THE SLUSH AND MUD OFF THE END OF THE RWY UNTIL THE R WINGTIP STRUCK A TREE; DAMAGING THE WING. FAA INVESTIGATOR RULED IT AN INCIDENT. IN RETROSPECT; I ERRED BY NOT ADEQUATELY CONSIDERING THE INCREASED DISTANCE NEEDED TO STOP ON A WET GRASS STRIP AND BY NOT REALIZING THAT THE RWY LENGTH (1600 FT) WAS MUCH TOO SHORT TO LAND ON CONSIDERING THE CONDITION OF THE FIELD. IT TURNED OUT THAT THE FIELD HAD BEEN CLOSED FOR SEVERAL WKS DUE TO FIELD CONDITIONS. DESPITE THE FACT THAT THE RWY HAD NOT BEEN MARKED CLOSED; I DID NOT EXERCISE SOUND JUDGEMENT WHEN I INSPECTED THE FIELD FROM THE AIR.