GND CONFLICT OCCURS DURING AN EXPEDITED TKOF BY AN EMB120 FLC AS A BONANZA LANDS ON OCCUPIED RWY 35 AT MTJ; CO.

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WAITING TO TAKE OFF AT S END OF TXWY FOR RWY 35 AT MONTROSE; CO (MTJ). A CITATION LANDED OPPOSITE DIRECTION (TO TFC FLOW AND WIND CONDITIONS) ON RWY 17. THE CITATION GOT OFF THE RWY; BUT HAD TO SIT AND WAIT FOR US TO TAKE OFF BEFORE THEY COULD GET BY US AND THE GULFSTREAM BEHIND US. DUE TO TXWY DESIGN AT MONTROSE; ALL TFC DEPARTING OR ARRIVING ON BOTH RWY 17 AND RWY 35 IS CHANNELED PAST A SINGULAR POINT AT THE S END OF RWY 35; WHICH NOT ONLY BACKS UP TFC; BUT ALSO PREVENTS ACFT DEPARTING RWY 35 FROM MAKING A 360 DEG TURN ON THE GND TO CHK FOR OTHER TFC IN THE PATTERN. WE WAITED ABOUT 10 MINS; WITH NO OTHER TFC LNDG OR DEPARTING; FOR A LNDG ACFT TO CANCEL BEFORE WE COULD GET OUR CLRNC; A DHC-8 LANDED ON RWY 35; THEN BACK TAXIED BEFORE CANCELING. AS IT BACK TAXIED; THE FO RECEIVED A CLRNC WHILE I MONITORED CTAF AND HEARD A BONANZA THAT RPTED ENTERING ON A MIDFIELD DOWNWIND. WHEN THE FO FINISHED WITH CTR; I BRIEFED HIM ON THE BONANZA THAT RPTED DOWNWIND AS THE DHC-8 CLRED THE RWY. I ASKED THE FO IF HE COULD SEE THE BONANZA OUT HIS WINDOW; TO WHICH HE SAID 'NEGATIVE.' WE THEN MADE OUR DEP ANNOUNCEMENT; AND BEGAN MOVING ONTO RWY 35. AS WE TAXIED ONTO THE RWY PROPER; THE BONANZA RPTED ON A L BASE; AND I QUERIED THE FO IF HE COULD SEE HIM YET; TO WHICH HE AGAIN RESPONDED; 'NEGATIVE.' I WAS REASSURED BY THIS (FALSELY) AS WE WERE ALMOST IN TKOF POS; AND AN ACFT JUST TURNING BASE SHOULD ALLOW A GENEROUS AMOUNT OF TIME FOR US TO DEPART WITHOUT CONFLICTING WITH THEM; ESPECIALLY WHEN VERIFIED BY THE ACFT NOT BEING VISIBLE ON BASE OR FINAL. ALMOST 3-4 SECONDS LATER THOUGH; AS WE BEGAN OUR TURN ONTO CTRLINE; THE BONANZA ANNOUNCED HE WAS ON FINAL; AND THAT WE 'BETTER MOVE; YOU BETTER GET GOING!' I ASKED MY FO 'CAN YOU SEE HIM NOW?' TO WHICH HE SAID 'YEAH! I GOT HIM NOW. HE'S REAL TIGHT ON BASE STILL AND TURNING FINAL.' 'WHAT; IS HE ON ABOUT A 1/4 MI BASE?' I ASKED. 'YEP;' THE FO SAID. I LINED UP ON CTRLINE AND BROUGHT THE PWR LEVERS FORWARD AND WE TOOK OFF WHILE THE BONANZA LANDED. FACTORS CONTRIBUTING TO THIS CONFLICT WERE THE TXWY ARRANGEMENT OF THE ARPT; INABILITY OF US BEING ABLE TO SEE THE DOWNWIND PORTION OF THE PATTERN; INCORRECT PERCEPTION OF TIME LEFT AVAILABLE AFTER THE BONANZA RPTED TURNING BASE; AND THE COWBOY STYLE PATTERN BY THE BONANZA ALONG WITH A LACK OF COMMUNICATING HIS INTENTION OF A HIGHLY NON STANDARD APCH. SEPARATION WAS NOT LOST. THE BONANZA DID NOT HAVE TO DO A GAR; BUT WE FELT EXTREMELY UNCOMFORTABLE WITH THIS EVENT. WHILE THIS IS THE FIRST SIT I'VE PERSONALLY BEEN INVOLVED IN AT MONTROSE; THIS CREW HAS WITNESSED MANY OTHER CLOSE CALLS AND POTENTIAL NEAR MISSES DUE TO THE COMBINATION OF POOR TXWY/RWY DESIGN; OPPOSITE DIRECTION OPS IN LOW/CALM WINDS; UNCTLED ARPT; AND LACK OF RADAR COVERAGE.