A DC8 WAS TOLD TO CROSS RWY 25R AND HOLD SHORT OF RWY 25L AFTER LNDG ON RWY 30 AND THAT THERE WAS AN ACFT IN POS ON RWY 25R. AS THE DC8 TAXIED ACROSS RWY 25R ON TXWY D THE CAPT LOOKED UP AND SAW A CESSNA PASS OVERHEAD APPROX 50- 100 FT. CAPT CALLED TWR AFTER PARKING TO SEE WHAT HAPPENED.

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THIS EVENT OCCURRED WHILE WE WERE TAXIING OUR ACFT TO PARK AT EXACTLY XA13Z ON SEP/THU/96; AT THE LONG BEACH ARPT; LONG BEACH; CA. AFTER LNDG ON RWY 30; WE WERE INSTRUCTED TO CONTACT GND. WE EXITED RWY 30L; ON TXWY A; THEN L ON TXWY D AND CONTACTED GND. GND CTL CLRED OUR ACFT AS FOLLOWS; 'ACR X HVY; CROSS RWY 25R; HOLD SHORT OF RWY 25L; TFC HOLDING IN POS RWY 25R FULL LENGTH.' PRIOR TO XING RWY 25R; I CLRED VISUALLY TO THE L. WHILE PHYSICALLY ON RWY 25R; TAXIING STRAIGHT AHEAD ON TXWY D; THE CAPT NOTICED A CESSNA ACFT (SINGLE ENG 152 OR 172 TYPE) INFLT PASS DIRECTLY OVER OUR ACFT AT APPROX 50-100 FT. HAD THE CESSNA BEEN ON THE GND OR JUST BARELY IN THE AIR; THERE WOULD HAVE BEEN A COLLISION. THE CESSNA ACFT APPARENTLY TOOK OFF AS WE WERE XING RWY 25R. HOWEVER; THE CESSNA MAY HAVE BEEN ON A MISSED APCH OR LOW APCH; AS WE DID NOT RECOGNIZE THE PRESENCE OF THE ACFT UNTIL DIRECTLY OVERHEAD. NO ACCIDENT ENSUED. WE REQUESTED A PHONE NUMBER FOR THE GND CTLR. AFTER PARKING; WE CALLED THE FACILITY AND WAS INFORMED THAT AN INVESTIGATION HAD BEGUN. WE INFORMED OUR CHIEF PLT AS WELL. CONTRIBUTING FACTOR: THE EXTREMELY HIGH VOLUME OF PVT FLT TFC UTILIZING RWYS 25R&L; COUPLED WITH MEDIUM TO HVY COMMERCIAL AND AIRLINE ACFT UTILIZING AN INTERSECTING DIAGONAL RWY 30 AND SUBSEQUENT PARALLEL TXWYS. CORRECTIVE ACTION: EVEN ON AN IFR CLRNC; AN APCH TO AND TAXIING ON ARPTS SUCH AS LONG BEACH CAN BE HAZARDOUS; REF VFR ACFT IN THE VICINITY; IN THE TFC PATTERN AND ON THE GND. EXTREME CAUTION SHOULD BE EXERCISED IN THE FORM OF CONTINUOUS VISUAL CLRING; WHILE NOT COMPROMISING ACFT OP; WHEN BELOW 10000 FT AND PARTICULARLY IN THE VICINITY OF HIGH DENSITY CITIES; AND ARPTS SUCH AS LONG BEACH.