ACR LANDED AT ARPT AFTER TWR WAS CLOSED; WHEN PLT STARTED TAXI TO TERMINAL; DISCOVERED TXWY ROUTE AHEAD WAS BARRICADED.

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LNDG AT BROWNSVILLE; TX; AT NIGHT AFTER CTL TWR IS CLOSED. TURN OFF RWY AT END ONTO PARALLEL TXWY E TO PROCEED TO TERMINAL. FOUND TXWY BARRICADED. TXWY IS TOO NARROW TO COMPLETE A 180 DEG TURN. USE OF REVERSE THRUST IS PROHIBITED BY COMPANY FLT MANUAL. COMPANY OPS AT THIS ARPT DOES NOT HAVE A TUG OR A TOW BAR FOR THIS ACFT TYPE. NO NOTAMS IN COMPANY DISPATCH PAPERWORK INDICATING TXWY CLOSURE. VALLEY APCH WHICH WORKED OUR ARR HAD THIS INFO BUT DID NOT MENTION IT DURING OUR ARR. TWR IS CLOSED AND IT IS NOW XA30. HAD OPS GET ARPT AUTH OUT OF BED TO REMOVE BARRICADES AND AUTH USE OF TXWY TO TERMINAL. TXWY WAS CLOSED DUE TO CONSTRUCTION OF A DRAINAGE DITCH OVER WHICH NEW CONCRETE HAD BEEN POURED A WK EARLIER BUT HAD NOT BEEN STRENGTH TESTED AFTER CURING. DESIGN STRENGTH WAS 177000 LBS AND WE WEIGHED 98000 LBS. ARPT AUTH AUTHORIZED USE AND WE TAXIED TO TERMINAL WITHOUT FURTHER INCIDENT. SUGGEST COMPANY INCLUDE ALL NOTAMS ON RELEASE PAPERWORK AND POS TUG AND TOW BAR FOR THIS TYPE ACFT AT THIS STATION.