<ARTICLE> 5 <CIK> 0000885538 <NAME> GREAT LAKES DREDGE & DOCK CORP. <MULTIPLIER> 1,000 <PERIOD-TYPE> 6-MOS 12-MOS <FISCAL-YEAR-END> DEC-31-1998 DEC-31-1997 <PERIOD-START> JAN-01-1998 JAN-01-1997 <PERIOD-END> JUN-30-1998 DEC-31-1997 <CASH> 550 1,717 <SECURITIES> 0 0 <RECEIVABLES> 43,999 40,749 <ALLOWANCES> 482 450 <INVENTORY> 9,626 9,195 <CURRENT-ASSETS> 80,319 91,156 <PP&E> 217,960 212,040 <DEPRECIATION> 80,652 73,324 <TOTAL-ASSETS> 234,907 245,555 <CURRENT-LIABILITIES> 41,134 49,594 <BONDS> 0 0 <PREFERRED-MANDATORY> 0 0 <PREFERRED> 0 0 <COMMON> 60,000 60,000 <OTHER-SE> 22,867 18,156 <TOTAL-LIABILITY-AND-EQUITY> 234,907 245,555 <SALES> 0 0 <TOTAL-REVENUES> 127,017 258,296 <CGS> 0 0 <TOTAL-COSTS> 105,933 228,383 <OTHER-EXPENSES> 9,920 18,922 <LOSS-PROVISION> 0 0 <INTEREST-EXPENSE> 2,195 6,303 <INCOME-PRETAX> 9,455 8,136 <INCOME-TAX> 3,411 2,667 <INCOME-CONTINUING> 4,710 3,802 <DISCONTINUED> 0 0 <EXTRAORDINARY> 0 0 <CHANGES> 0 0 <NET-INCOME> 4,710 3,802 <EPS-PRIMARY> 0 0 <EPS-DILUTED> 0 0