CFTT IN IMC CONDITIONS AFTER SMA STARTS PICKING UP INFLT ICING.

Narrative

ON AN IFR FLT FROM HOU TO DYR CRUISING ALT 9000 FT; WX WAS CHKED FROM FSS IN SHV AREA AND THE DYR WX WAS GIVEN AS 10000 S WITH THAT I DECIDED TO CONTINUE ONTO DYR. AT THE GILMORE VOR I AGAIN CHKED WITH FSS AND WAS TOLD THE DYR WX WAS 2200 OVCST AND APPROX 8 MI VISIBILITY. I THEN ASKED THE ATC CTLR ABOUT ANY ICING CONDITIONS; HE CHKED WITH OTHER ACFT AND CTLRS AND THERE WERE NO RPTS OF ANY ICING. 30 MI SW DYR AT 9000 FT I REQUESTED A DSCNT AND WAS CLRED TO 4000 FT AND SHORTLY THEREAFTER CLRED TO 2300 FT TO RPT FIELD IN SIGHT FOR VISUAL APCH. OUT OF 3-4000 FT WAS CLRED TO 2100 FT. DSNDING THROUGH 3000 FT; I STARTED PICKING UP SOME ICE; SO I PUSHED DOWN TO 2100 FT EXPECTING TO BE VISUAL. ICE APPEARED TO BE BUILDING QUITE RAPIDLY AND I ASKED THE CTLR FOR LOWER TO GET VISUAL; HE COULDN'T GIVE LOWER (MVA). AT THIS TIME I WAS APPROX 5 MI FROM THE ARPT (DECISION TIME). I WAS CLOSE TO THE VOR/DME RWY 4 APCH AND THE CHART SHOWED NO OBSTRUCTIONS; MY DECISION WAS TO PUSH RAPIDLY TO VFR CONDITIONS. I FELT THAT THIS WOULD BE MUCH SAFER THAN TAKING A VECTOR BACK AROUND FOR AN APCH IN THESE CONDITIONS. THE CTLR WAS GIVING DIRECTION AND DISTANCE TO THE ARPT AND THIS WAS GREATLY APPRECIATED.