A CPR JET MDT RAN OFF OF THE END OF THE RWY AT NIGHT.

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WE DEPARTED PORTLAND AT APPROX XV15 LCL FOR CORVALLIS. I UPDATED THE WX FROM MCMINNVILLE FSS BEFORE LEAVING. THEY ONLY HAD THE HR OLD AWOS WX AND MADE NO MENTION OF THE PREVIOUSLY NOTED RWY CLOSURE. ZSE CLRED US DIRECTLY TO CORVALLIS. WE WERE HANDED OFF TO EUGENE APCH CTL FOR VECTORS TO THE ILS 17 AT CORVALLIS. WE MADE A POS RPT ON THE UNICOM FREQ (123.0). NO ONE RESPONDED OVER THE UNICOM AND THE AWOS CONFIRMED THE WX. WE COMPLETED THE CHKLIST; TURNED ON THE RWY APCH LIGHTS (123.0) AND INTERCEPTED THE ILS. AT APPROX 5 MI OUT; WE HAD THE ARPT IN SIGHT AND WERE CLRED TO LAND. WE WERE TOLD TO RPT ON THE GND. I COULD PLAINLY SEE THE APCH LIGHTS AND VASI LIGHTS 5 MI OUT ON FINAL. AS WE GOT CLOSER; HOWEVER; THE HIGH INTENSITY APCH LIGHTS BEGAN TO OBSCURE MY VISION. THE LIGHTS WERE ON HIGH AND IN ADDITION THERE WAS MIST/MOISTURE IN THE AIR CAUSING QUITE A BIT OF REFLECTION. (THE ARPT WENT 0/0 ABOUT AN HR AFTER MY LNDG.) I ASKED MY COPLT TO STEP DOWN THE APCH LIGHTS. HE TRIED; BUT THEY WOULD NOT STEP DOWN. WE WERE ON REF SPD AND SLIGHTLY LOW ON THE ILS AND VASI. THE ACFT LNDG LIGHTS PROVIDED GOOD VISUAL REFS (I.E.; RWY CTRLINE; RWY NUMBER; RWY EDGE; ETC) FOR LNDG. I TOUCHED DOWN ON THE RWY CTR; REVERSED AND BRAKED. I COULD NOT SEE THE RWY EDGE LIGHTS NOR THE FAR END BOUNDARY LIGHTS. THE RWY WAS WET AND BRAKING SEEMED INEFFECTIVE. THE ACFT DEPARTED THE END OF THE RWY SLIGHTLY L OF CTRLINE AND ROLLED 100 FT INTO THE WET GND BEYOND. I ESTIMATE WE L THE RWY BTWN 30- 40 KTS AND THE NOSE GEAR FAILED. I SHUT DOWN THE ENGS AND EVACED THE PAX USING THE NORMAL CABIN DOOR AND STEPS. THERE WERE NO INJURIES TO THE PAX OR CREW. I CONTACTED MCMINNVILLE FSS AND EUGENE TWR SO THEY COULD NOTAM THE ARPT CLOSED. THEY GOT ME IN TOUCH WITH THE NTSB AND FAA DUTY OFFICERS. I WAS TOLD TO MEET MR. Y FROM THE PORTLAND GADO AT XI00 ON DEC/SUN/93 AT THE CORVALLIS ARPT. THE NEXT DAY; DISCUSSIONS WITH MR. X; THE ARPT MGR; AND OTHER ARPT PERSONNEL CONFIRMED THAT A CONTRACTOR WORKING ON THE RWY HAD CUT THE ELECTRICAL CABLE FOR THE LIGHTS. MR. X ALSO CONFIRMED NO NOTAM HAD BEEN ISSUED REGARDING THE STATUS OF THE RWY LIGHTS. SUPPLEMENTAL INFORMATION FROM ACN 258772: I ALSO THOUGHT THAT THE RWY LIGHTS WERE ON BECAUSE I COULD SEE TXWY MARKERS; THE INTXN OF A XING RWY; AND EVIDENTLY REFLECTIONS FROM THE NORMAL RWY EDGE LIGHTS. I NOTICED THE DECELERATION WAS NOT QUITE NORMAL. THE CAPT WENT BACK INTO REVERSE AND COMMENCED MAX BRAKING. THE ANTI-SKID WAS CYCLING. MR. X ALSO CONFIRMED NO NOTAM HAD BEEN ISSUED REGARDING THE STATUS OF THE RWY LIGHTS. MR. Y PORTLAND FAA GADO OFFICIALLY DESIGNATED THIS AN INCIDENT.