A LIGHT SINGLE ENG ACFT ENRTE FROM ENW TO UES ENCOUNTERED RIME ICE AT 3000 FT MSL.

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ON A FLT IFR FROM KENOSHA; WI; TO WAUKESHA; WI; I WAS RESPONSIBLE FOR THE RADIOS AND NAV. AT A CRUISING ALT OF 3000 FT MSL; WE RECEIVED A DELAY VECTOR FOR TFC GOING INTO WAUKESHA ON THE ILS RWY 10. AT THIS TIME WE WERE IN IMC AND THE TEMPS WERE ABOVE FREEZING DURING DEP AND CRUISE. AS WE ACCEPTED THE DELAY VECTOR; OUR PLANE STARTED TO PICK UP SEVERE RIME ICING. I RPTED THIS TO APCH CTL AND HE CLRED US DOWN TO THE MVA OF 2800 FT MSL. WITHIN SECONDS; THE ICE HAD BUILT UP ENOUGH TO DECREASE PERFORMANCE WHERE FULL PWR AND A BEST RATE OF CLB AIRSPD WERE NEEDED TO MAINTAIN ALT. SOON WE COULD NOT MAINTAIN ALT ANY LONGER. RIGHT AFTER THE SEVERE ICING STARTED THE PF STRESSED THAT WE NEEDED DIRECT TO THE ARPT IMMEDIATELY. THE CTLR THEN GAVE US A VECTOR IMMEDIATELY. AS WE DSNDED THROUGH 2300 FT MSL; WE HAD GND CONTACT THROUGH A LAYER OF SCATTERED CLOUDS. AT APPROX 1600 FT MSL AND 3 MI SW OF THE ARPT; I SPOTTED THE BEACON; THEN THE RWY. I THEN TOOK THE AIRPLANE AND LANDED SAFELY ON RWY 36 IN WAUKESHA.