The coalitions succeeded in opposing construction of the dam and continued to lobby for state acquisition of lands to preserve open space protected from development.  The Delaware State Park Commission purchased 24 acres and created the White Clay Creek State Park in 1968 and, by 1984, the DuPont Company donated its land holdings of 1,700 acres to Delaware’s White Clay Creek State Park and Pennsylvania’s White Clay Creek Preserve.  Miller was a regular reader of the fine print in legal notices, identifying sheriff sales of contiguous property that the City of Newark and New Castle County were able to add to the White Clay Creek State Park, currently comprising almost 2,300 scenic acres.