A DH8A CREW; CRUISING AT 13000 FT; EXPERIENCED A HYD FLUID LOSS; SPAWNING AN EMER WITH A LNDG SHORT OF DEST.

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WHILE CRUISING AT 13000 FT MSL ENRTE; THE MASTER CAUTION FLASHER BEGAN FLASHING. LOOKING AT THE CAUTION/WARNING LIGHT PANEL SHOWED THE ROLL SPOILER INBOARD HYD AND #1 HYD ISOLATION VALVE LIGHTS ILLUMINATED. I THEN LOOKED AT THE #1 HYD QUANTITY GAUGE AND FOUND IT TO BE JUST ABOVE .5 QTS. I DESIGNATED THE PF; WHICH WAS THE FO; AND GOT OUT THE EMER PROCS CHKLIST. I FIRST RAN THE CHKLIST FOR THE ROLL SPOILER CAUTION LIGHT; KNOWING IT WAS THE SHORTER AND LESS INVOLVED CHKLIST. THEN I PROCEEDED TO RUN THE PARTIAL LOSS OF HYD CONTENTS CHKLIST. THIS CHKLIST DIRECTED ME TO RUN THE FLAPLESS LNDG CHKLIST; WHICH I DID NEXT. DURING THESE CHKLISTS WE WERE GIVEN NUMEROUS ALT CHANGES; VECTORS TO FIXES; AND FREQ CHANGES. UPON CONTACT WITH NY APCH I TOLD THEM WE WERE WORKING ON A HYD PROB THAT WE WOULD PROBABLY DIVERT TO ISP AND TO STANDBY. I FINISHED THE FLAPLESS LNDG CHKLIST; FIGURING OUT APCH AND VREF SPDS; AND REQUIRED LNDG DISTANCE. AFTER DISCUSSING IT WITH THE FO WE DECIDED TO DIVERT TO ISP; THE CLOSER ARPT WITH A LONGER RWY. HE THEN TOOK COM WITH APCH; DECLARED THE EMER AND GOT VECTORS FOR ISP. I TALKED WITH THE FLT ATTENDANT; CALLED ACR OPS; MADE AN ANNOUNCEMENT TO THE PAX; AND TALKED TO THE FLT ATTENDANT AGAIN; TO LET HER KNOW THAT WE WOULD BRACE THE PAX JUST TO BE SAFE. WITH THAT COMPLETE I GOT BACK ON APCH CTL WITH THE FO. WE WERE NOW ON A WIDE R BASE TO RWY 6 AT ISP. I RAN THE ARR CHKLIST; AND WE LANDED WITHOUT INCIDENT. I WAS ABLE TO BRING THE ACFT TO A STOP WITH THE PARKING BRAKE ON THE RWY. HAVING AMPLE CTL OF THE ACFT; I TAXIED TO A PARKING SPOT. THE PAX WERE DEPLANED. I CALLED THE COMPANY AND MAINT WITH THE LOGBOOK WRITE-UP. OVERALL; I FELT EVERYTHING WENT WELL; AND THE CHKLISTS AND TRAINING DID THEIR JOB. IF ANYTHING DIDN'T GO BY THE BOOK IT WOULD BE THAT WE DIDN'T SLOW DOWN AND TAKE OUR TIME. I KNOW AND TAKE FULL RESPONSIBILITY FOR ALLOWING THE APCH CTLR TO VECTOR US R TO THE ARPT; AND NOT GETTING DELAYING VECTORS TO SLOW DOWN. ALL CHKLISTS WERE COMPLETED; AND SAFETY WAS ACHIEVED; BUT WE COULD HAVE GIVEN THE FLT ATTENDANT MORE TIME FOR HER PREPARATION.