THE RPTR LANDED UNINTENTIONALLY ON A CLOSED RWY AT AN UNCTLED ARPT FROM A L BASE PATTERN ENTRY.

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UNINTENTIONAL LNDG ON A CLOSED RWY. AT ABOUT XA45 AM ON A FLT FROM GEG TO EPH VFR I CALLED EPH UNICOM APPROX 15 MI OUT AND RECEIVED NO RESPONSE. I KNEW THE WIND WAS LIGHT AND VARIABLE OUT OF THE S. THE WX WAS CLR AND 30 MI. COMING FROM GEG I ENTERED A L BASE TO FINAL FOR RWY 20. THE ARPT AND ITS RWYS HAVE EXTENSIVE CRACKS IN THE ASPHALT AND CONCRETE WITH GRASS AND WEEDS GROWING UP OUT OF THEM; ESPECIALLY RWY 20'S FIRST 1000-1500 FT. THE REST OF THE 6699 FT RWY IS ALSO CRACKED BUT THE GRASS ISN'T QUITE AS HIGH. I HAVE ALWAYS APCHED HIGH TO LAND AFTER THIS BAD PORTION OF RWY WITH MORE THAN 2500 FT LEFT BY THE TIME I TURN OFF AT THE TXWY AT APPROX 4400 FT DOWN THE RWY. AS I WAS TURNING FINAL I NOTICED A TRUCK ENTERING THE ARPT AND HDG FOR THE TXWY WHERE I NORMALLY TURN OFF. I DIDN'T NOTICE ANY FLAGS OR LIGHTS ON THE TRUCK AS HE PROCEEDED ACROSS THE RWY IN PLENTY OF TIME FOR ME TO COMPLETE MY APCH AND LNDG. ON THE ROLLOUT WHEN I GOT TO THE TXWY I DISCOVERED THAT IT WAS BROKEN UP AND NOT SUITABLE FOR TAXIING ON SO I THOUGHT SOMETHING'S FISHY HERE SO AS I CONTINUED TO ROLL ON I NOTICED 2 WORKERS ON EACH SIDE OF THE RWY AT THE VERY END CUTTING ASPHALT; WITH AN X ON THE NUMBERS BTWN THEM. IT WAS NOT TILL THEN THAT I REALIZED THAT I MUST HAVE LANDED ON A CLOSED RWY. I HAD CHKED NOTAMS 3 HRS PRIOR TO THIS AND I DON'T RECALL SEEING ONE ON EPH; ESPECIALLY FOR A RWY CLOSURE. CONTRIBUTING FACTORS THAT I FEEL THAT LED UP TO THIS ARE: THE HIGH APCH TO AVOID THE WORST OF THE CRACKS AND GRASS. THE POOR MAINT OF THE FIRST 1000-1500 FT OF RWY WHICH ALLOWED GRASS AND WEEDS TO OBSCURE THE X ON THE APCH END NUMBERS. THE DISTR OF THE TRUCK MOVEMENT ABOUT THE ARPT. INSUFFICIENT X'S ON THE RWY. CORRECTIVE ACTIONS I FEEL COULD HELP PREVENT THIS SORT OF OCCURRENCE ARE: UPON THE CLOSURE OF AN OTHERWISE ACTIVE RWY; A VERT X BE PLACED AT EACH END FOR A MINIMUM OF 7 DAYS. AND/OR MORE X'S USED ALONG THE LENGTH OF THE RWY.