A DHC6-300 PIC RPT ON THE LOSS OF ACFT CTL AND RWY EXCURSION ON TKOF FROM MONUMENT VALLEY ARPT; 71V; UT. ACFT DAMAGED DURING SUBSEQUENT ABORT.

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MONUMENT VALLEY ARPT IS A 1-WAY IN; AND 1-WAY OUT ARPT. RWYS ARE RWY 16/34; LNDGS ARE MADE ON RWY 16 WHICH IS UPHILL AND HAS 700-800 FT CLIFF AT THE END. TKOFS ARE MADE ON RWY 34. THE RWY IS 4000 FT BY 40 FT AND THE SOUTHERN HALF IS PAVED WITH LOOSE GRAVEL ON THE SIDES AND THE NORTHERN HALF IS DIRT. WINDSHEAR CAN BE ENCOUNTERED WHEN WINDS IS BLOWING FROM THE SW; AND DIRECTIONAL CTL CAN BE A PROB ON TKOF. AT THE TIME OF TKOF; THE WIND WAS VARIABLE FROM 210 DEGS TO 250 DEGS AT 5 KTS GUSTING TO 15 KTS. WE STARTED THE TKOF. THE ACFT (DHC6-300) STARTED TO VEER TO THE R. I APPLIED PROPER XWIND CTL. THE ACFT STARTED TO STRAIGHTEN UP. AT AROUND 25-30 KIAS; WE ENCOUNTERED SEVERE WINDSHEAR AND THE ACFT ABRUPTLY TURNED TO THE L. AT THAT POINT; I ABORTED THE TKOF AND; WHEN I REDUCED PWR; THE ACFT TURNED FARTHER TO THE L AND STARTED TO SLIDE SIDEWAYS. THEN; THE ACFT WENT OFF THE L SIDE OFF THE RWY AND CAME TO REST ON A BERM IN A NOSE LOW ATTITUDE. I SHUT DOWN THE ENGS AND THE FO AND I EVACED THE PAX ACCORDING TO THE COMPANY MANUAL. SUPPLEMENTAL INFO FROM ACN471798: RUDDER EFFECTIVENESS WAS COMPLETELY LOST DUE TO THE WINDSHEAR. THERE WAS NO INJURY TO ANY OF THE 15 PAX. BRAKING WAS NON EFFECTIVE DUE TO THE SKIDDING AND SLIDING. WINDS DO TEND TO BE A PROB IN THE MONUMENT VALLEY AREA; AND I BELIEVE PART 121 OPS SHOULDN'T BE CONDUCTED INTO THEIR NON CTLED RWYS UNLESS WX RPTING CAPABILITIES ARE AVAILABLE AT ALL TIMES.