SMT PLT IN ALASKA LANDS ON CLOSED PORTION OF RWY. THE 'X' PLACED TO INDICATE CLOSED IS YELLOW FABRIC IN THE GRASS AT APCH END. THE GRASS IS 6 INCHES HIGH AND FAIRLY OBSCURES THE 'X.'

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KIANA ARPT WAS NOTAMED FOR PARTIAL RWY CLOSURE FOR RESURFACING. ON FIRST DAY I CALLED FSS FOR ADDITIONAL INFO BECAUSE NOTAM TEXT WAS CONFUSING. FSS SAID THEY HAD NO ADDITIONAL INFO. FLEW TO KIANA AND RETURNED. NO EVIDENCE OF WORK BEING DONE THERE. ON SECOND DAY OF NOTAM (DATE OF THIS INCIDENT) I APCHED KIANA AND OBSERVED 2 CONSTRUCTION VEHICLES ALONG THE RWY OUTSIDE THE EDGE CONES. I OVERFLEW THE RWY AND OBSERVED A LINE OF MARKING CONES DOWN THE MIDDLE. I ATTEMPTED TO CALL THE ARPT ON THE FREQ CONTAINED IN THE NOTAM WITH NO ANSWER. I THEN CONTACTED OUR AGENT BY RADIO. SHE DID NOT KNOW WHAT WAS HAPPENING. THE ENTIRE RWY APPEARED USABLE; SO I LINED UP FOR THE R-HAND SIDE OF THE CONES. ON SHORT FINAL; A CONSTRUCTION VEHICLE TURNED OUT ONTO THE RWY NECESSITATING A GAR. I LANDED ON THE R SIDE OF THE CONES ON MY SECOND APCH. A CONSTRUCTION WORKER APCHED ME AND TOLD ME THAT I HAD LANDED ON THE CLOSED HALF OF THE RWY. WHEN TAXIING OUT; I NOTICED A YELLOW FABRIC 'X' IN THE GRASS AT THE APCH END. I DID NOT SEE IT ON EITHER APCH. IT WAS LIKELY OBSCURED BY THE 6 INCH HIGH GRASS.