A CRJ700 ON THE DCA RIVER VISUAL FIRST GOT AN EGPWS WARNING AT 1;100 FT THEN A TCAS WARNING. BOTH SUBSIDED AND THE APCH WAS CONTINUED.

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RIVER VISUAL RWY 19 DCA AT NIGHT. I WAS THE PF. FO WHO WAS MONITORING RECOMMENDED XING ALT AS I BEGAN THE TURN TO FOLLOW THE RIVER AT THE 4 DME POINT THE FO CALLED '4 DME SLIGHTLY LOW;' I CHKED AT JUST LESS THAN 1100 FT; 100-150 FT BELOW RECOMMENDED ALT; AND DECREASED THE RATE OF DSCNT. AS I WAS DOING THIS WE RECEIVED A 'CAUTION OBSTACLE' ALERT; I LOOKED UP AND SAW THE 2 BUILDINGS ON THE S SIDE OF THE RIVER PASSING THROUGH OUR 2 O'CLOCK POS. AS WE CONTINUED OUR L TURN I INCREASED THE ANGLE SLIGHTLY TO 30 DEGS; SAW WE WERE TURNING WELL CLR OF THE BUILDINGS AND WOULD REMAIN OVER THE RIVER. I TOOK MY HAND OFF THE THRUST LEVERS; POINTED TO THE BUILDINGS AND SAID 'IT'S THE BUILDINGS; WE'RE CLR; YOU HAVE THEM IN SIGHT?' AS HE WAS SAYING 'YES' WE GOT THE AURAL GPWS WARNING 'OBSTACLE-WHOOP-WHOOP-PULL UP.' THE FO CALLED 'GAR.' AS I BROUGHT MY HAND BACK TO THE THRUST LEVERS TO BEGIN THE MANEUVER; WE RECEIVED A TCAS ALERT 'TFC-TFC.' I SCANNED FOR THE TFC; BUT DIDN'T SEE IT AS I PITCHED UP AND BEGAN ROLLING WINGS LEVEL WHICH WOULD KEEP US ORIENTED OVER THIS SECTION OF THE RIVER. I ASKED 'YOU HAVE THE TFC?' AND THE FO RESPONDED 'NO.' AS HE SAID THIS WE RECEIVED 'CLR OBSTACLE' I STOPPED THE CLB AND BEGAN A R TURN TO REMAIN CLR OF P-56. WE HAD NOT YET HAD TIME TO CONFIGURE FOR THE CLB; OUR FOCUS AFTER THE INITIAL GPWS WARNING ON MAKING SURE WE WERE NOT ABOUT TO CLB INTO OR TURN INTO TFC. WE HAD NO MORE TFC ALERTS; WERE STILL CONFIGURED FOR LNDG; AND HAD THE RWY 19 VASI IN SIGHT INDICATING SLIGHTLY HIGH; BUT ABLE TO CONTINUE ON A NORMAL STABILIZED APCH AND LNDG WHICH WE DID; AFTER RE-RUNNING THE BEFORE LNDG CHKLIST.