MOONEY M20 ACFT LANDED HARD; BOUNCED AND RAN OFF THE SIDE OF THE RWY COLLAPSING THE L MAIN GEAR.

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I WAS ON FINAL TO RWY 21 AT PULLIAM ARPT; FLAGSTAFF; AZ. HIGH OVCST; VISIBILITY +10 MI; WIND 160 DEGS AT 9 KTS. CROSSED OVER FENCE AT 85 KTS; OVER THRESHOLD AT 85 KTS; AND PROCEEDED TO ENTER LNDG CONFIGN. AT 80 KTS; PLANE TOUCHED DOWN AND BOUNCED. MAINTAINED VERT; LONGITUDINAL AND HORIZ CTL; MAINTAINED STABILITY AND ATTEMPTED TO LAND AGAIN. TOUCHED DOWN; ROLLED APPROX 50 YARDS; L WING DROPPED. I PUSHED IN R RUDDER; PULLED BACK ON YOKE AND TURNED TO LIFT WING. STARTED SKIDDING L. TURNED OFF GAS; ELECTRICAL; MASTER ALT'S; SHUT DOWN ALL SYS WITH PWR AND MIXTURE FULL BACK POS AND PROP FORWARD. I LEFT THEM IN THIS POS. I PLACED THEM THERE AS SOON AS WING DROPPED AND NO RUDDER RESPONSE. ALL POH EMER PROCS FOLLOWED. EXITED ACFT; GOT AWAY FROM PLANE. NEITHER MY SON; A PAX; NOR MYSELF WERE INJURED. PLANE DETERMINED TO BE IN NO DANGER OF FIRE; CONFIRMED BY ARPT FIRE DEPT. I DON'T KNOW WHY INCIDENT OCCURRED. LNDG WAS FIRM ON INITIAL TOUCHDOWN. NO STALL HORN WENT OFF AT ALL AND PLANE APPEARED NORMAL UNTIL RIGHT AT TOUCHDOWN. I TOOK CORRECTIVE ACTION AND CTL OF PLANE AND REALIGNED AND LANDED; THEN L MAIN GAVE WAY. SKIDDED 50-75 YARDS OFF RWY 21.