BE18 AIR TAXI CARGO ACFT TAXIES INTO DITCH DUG ACROSS TXWY.

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UPON LNDG ON RWY 8R I TURNED ONTO THE LIGHTED PARALLEL TXWY. I THEN ENTERED THE LIGHTED TXWY LEADING TO THE TERMINAL RAMP. THE ACFT DROPPED INTO AN EXCAVATION THAT HAD BEEN CUT ACROSS THE LIGHTED TXWY. THERE WERE BARRIERS THAT HAD BEEN BLOWN OVER AND COULD NOT BE SEEN FROM THE COCKPIT. THERE WAS A NOTAM; BUT DUE TO THE LARGE AMOUNT OF CONSTRUCTION THERE WAS CONFUSION AS TO WHAT WAS AND WAS NOT CLOSED. THE TWR WAS CLOSED AT THIS TIME OF MORNING. TO PREVENT A SIMILAR SIT FROM HAPPENING; I FEEL THAT BARRIERS THAT WILL NOT BLOW OVER SHOULD BE USED; AND LIGHTS SHOULD BE TURNED OFF ON UNUSABLE TXWYS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THE ACFT WAS A BE18 AND IT WAS EXTENSIVELY DAMAGED. BOTH PROPS WERE BENT; THE LNDG GEAR WAS BENT; A CYLINDER ON 1 ENG WAS DAMAGED; ETC. THE ARPT ACTED PROMPTLY AND THE TXWY LIGHTS WERE TURNED OFF THE NEXT DAY; THE BARRIERS HAD FLAGS ATTACHED. RPTR'S COMPANY HAS LAWYERS DISCUSSING THE COSTS WITH THE CONSTRUCTION COMPANY. IRONICALLY THE TXWY WAS REOPENED AT THE SAME TIME THAT THE ACFT WAS FINALLY REPAIRED AND WAS ABLE TO FLY AGAIN. THE RPTR WAS REQUIRED TO TAKE A RETEST WITH THE FAA. HE FEELS THAT WAS AN INCORRECT ACTION AND SHOULD NOT HAVE BEEN REQUIRED. HE PASSED IT QUITE WELL; BUT IS ANNOYED AS HE FEELS THE ARPT WAS WRONG TO HAVE THE TXWY LIGHTED WHEN IT WAS UNUSABLE. THERE IS STILL A GREAT DEAL OF CONSTRUCTION GOING ON AT THE ARPT AND WILL BE FOR SOME TIME IN THE FUTURE.