The Safety Board's full report on this investigation is provided as Aviation Accident Report number AAR-82/08. To obtain a copy of this report, or to view the executive summary online, please see the Web site at http://www.ntsb.gov/publictn/publictn.htm SCHED FLT FROM WASHINGTON, DC TO FT LAUDERDALE, FL. THE RWY WAS CLSD OVR 1 HR DRG MOD TO HVY SNWFALL FOR SNW RMVL, THUS DELAYING DEPARTURES. THE ACFT WAS DEICED WITH A HEATED ETHYLENE GLYCOL & WTR SOLUTION WITHOUT ENG INLET PLUGS OR PITOT STATIC CVRS INSTLD. CONTRARY TO PROCEDURES, REVERSE THRUST WAS USED TO HELP A TUG DRG PUSHBACK FROM THE GATE & BLEW SNW.AFT PUSHBACK, THE FLT WAS DELAYED 49 MIN WHILE SNW CONTD IN SUBFRZG CONDS. WHILE WAITING, THE ACFT WAS PSND NEAR THE EXHAUST OF THE ACFT AHEAD. DRG TKOF, THE EPR'S WERE SET FOR 2.04, BUT AN ANOMALY WAS NOTED IN ENG INST READING. THE CAPTELECTED TO CONT TKOF. THE ACFT TKOF APRX 2000 FT & 15 SEC PAST THE NORMAL TKOF PT. AFT LEFT-OFF, IT INITIALLY CLIMBED, BUT FAILED TO ACLT. THE STALL WARNING STICKSHAKER ACTIVATED SHRTLY AFT TKOF & CONTD TIL THE ACFT SETTLED, HIT A BRIDGE &SVRL VEHECLES, THEN PLUNGED INTO A FRZN RVR. INVESTIGATION RRVEALED ENG INLET PRES PROBES BCM BLKD WITH ICE, RESULTED INHI EPR INDCN, PSBL PITCHUP W SNW/ICE FRZ ON WNGS, NO RWY DSTC MRKRS WERE AVAILABLE, CREW HAD LMTD CLD WX OPNL EXPERIENCE