AN ACR LTT CREW ROLLED OUT ONTO A CLOSED PORTION OF A RWY.

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BEGAN ILS 18 APCH AND WERE TOLD ILS 18 IS UNMONITORED AND UNRELIABLE; SO WE MISSED TO HOLD AT THE VOR AS PUBLISHED. UPON ENTERING THE THIRD TURN; WE WERE VECTORED TO THE ILS 18 WHICH WAS NOW RELIABLE. NOTHING ON ATIS OR FROM APCH ABOUT ILS 18 UNTIL WE STARTED THE APCH; ONCE WE HEARD UNRELIABLE WE IMMEDIATELY ASKED FOR A HOLD. WX WAS STRONG TSTMS; HVY RAIN AND WIND SHEAR. RWY 18 ON ATIS WAS OPEN BUT LAST 2650 FT WAS CLOSED; LEAVING 5850 FT AVAILABLE. AFTER WE SHOT A SUCCESSFUL ILS 18; WE TOUCHED ON THE RWY; BUT BECAUSE OF THE WIND AND RAIN ON RWY; WE ROLLED OUT TO THE END OF THE RWY. TWR DID NOT HAVE A PROB WITH THIS! THE ILS 18 WAS UNMONITORED AND UNRELIABLE DUE TO CONSTRUCTION WORKERS ON RWY. SINCE IT WAS NIGHT AND THE MIDDLE OF A HVY TSTM; NO WORKERS OR CONSTRUCTION WAS BEING PERFORMED ON THE RWY SO THE TWR DEEMED THE RWY USABLE. WE HAD NO WARNING OR ANY INFO AVAILABLE TO LEAD US TO BELIEVE ILS 18 WAS UNRELIABLE UNTIL TOLD BY TWR AFTER STARTING APCH. WHEN THE WX CAME UP TO 2 MI WHILE WE WERE IN THE HOLD; IT MADE ILS 18 USABLE. ON ATIS; RWY 18 WAS 8500 FT WITH LAST 2650 FT UNUSABLE; LEAVING 5850 FT. AFTER TOUCHDOWN; THE STANDING WATER MADE IT HARD TO STOP IN 5850 FT BUT WE DID AND CONTINUED THE ROLLOUT TILL THE END IN THE INTEREST OF SAFETY.