A LNDG PA28-140 PLT UNDERSHOT HIS APCH AND HITS A FENCE PRIOR TO THE RWY THRESHOLD; GOING AROUND SUCCESSFULLY. NO MENTION OF ACFT DAMAGE.

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CALLED 7 MI OUT FROM GLENNS FERRY; ID (U89); AND BEGAN THE DSCNT TO PATTERN ALT. MADE TOWARDS MIDFIELD TO LOOK AT THE WIND INDICATORS AND THEN ENTERED A MIDFIELD L DOWNWIND FOR RWY 26. SLIGHTLY PAST THE RWY 26 THRESHOLD I BEGAN THE NORMAL DSCNT TO LNDG; THROTTLED BACK TO 1700 RPM; TURNED BASE AND I PULLED 10 DEGS OF FLAPS. WHEN I TURNED FINAL I OVERSHOT THE RWY CTRLINE BUT CORRECTED AND TRACKED TO THE RWY. THE APCH LOOKED AND FELT NORMAL UNTIL SHORT FINAL WHEN I SEEMED REALLY LOW. I REMOVED THE CARB HEAT AND ADDED SOME PWR BUT I CONTINUED DSNDING; AND I ADDED ALL AVAILABLE PWR. I STRUCK A FENCE BEFORE THE THRESHOLD OF RWY 26 BUT I DID NOT FEEL THE PLANE IMPACT THE GND. I FOLLOWED THE RWY AND CLBED WHILE I REMOVED A NOTCH OF FLAPS. I LOWERED THE NOSE TO ACCELERATE TO 85 KTS AND THEN I REMOVED THE LAST NOTCH OF FLAPS. I ONLY NOTICED LIGHT TO SOME MODERATE TURB. I MISJUDGED THE GS ON FINAL ALTHOUGH TO ME THE APCH AND GS LOOKED NORMAL UNTIL SHORT FINAL. I FAILED TO ADD PWR TO CORRECT THE GS SOON ENOUGH TO AVOID SINKING TOO LOW.